* [Qemu-devel] [PATCH v3 0/9] xen/9pfs: introduce the Xen 9pfs backend
@ 2017-03-16 20:00 ` Stefano Stabellini
0 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:00 UTC (permalink / raw)
To: qemu-devel
Cc: xen-devel, sstabellini, anthony.perard, jgross, aneesh.kumar, groug
Hi all,
This patch series implements a new transport for 9pfs, aimed at Xen
systems.
The transport is based on a traditional Xen frontend and backend drivers
pair. This patch series implements the backend, which typically runs in
Dom0. I sent another series to implement the frontend in Linux
(http://marc.info/?l=linux-kernel&m=148883047125960&w=2).
The backend complies to the Xen transport for 9pfs specification
version 1, available here:
http://xenbits.xen.org/gitweb/?p=xen.git;a=blob_plain;f=docs/misc/9pfs.markdown;hb=HEAD
Changes in v3:
- do not build backends for targets that do not support xen
- remove xen_9pfs.h, merge its content into xen-9p-backend.c
- remove xen_9pfs_header, introduce P9MsgHeader
- use le32_to_cpu to access P9MsgHeader fields
- many coding style fixes
- run checkpatch on all patches
- add check if num_rings < 1
- use g_strdup_printf
- free fsdev_id in xen_9pfs_free
- add comments
Changes in v2:
- fix coding style
- compile xen-9p-backend.c if CONFIG_XEN_BACKEND
- add patch to set CONFIG_XEN_BACKEND only for the right targets
- add review-bys
Stefano Stabellini (9):
xen: do not build backends for targets that do not support xen
xen: import ring.h from xen
9p: introduce a type for the 9p header
xen/9pfs: introduce Xen 9pfs backend
xen/9pfs: connect to the frontend
xen/9pfs: receive requests from the frontend
xen/9pfs: implement in/out_iov_from_pdu and vmarshal/vunmarshal
xen/9pfs: send responses back to the frontend
xen/9pfs: build and register Xen 9pfs backend
Makefile | 1 +
hw/9pfs/9p.h | 6 +
hw/9pfs/Makefile.objs | 1 +
hw/9pfs/virtio-9p-device.c | 6 +-
hw/9pfs/xen-9p-backend.c | 434 +++++++++++++++++++++++++++++++++++++++++
hw/block/Makefile.objs | 2 +-
hw/block/xen_blkif.h | 2 +-
hw/char/Makefile.objs | 2 +-
hw/display/Makefile.objs | 2 +-
hw/net/Makefile.objs | 2 +-
hw/usb/Makefile.objs | 2 +-
hw/usb/xen-usb.c | 2 +-
hw/xen/Makefile.objs | 2 +-
hw/xen/xen_backend.c | 3 +
include/hw/xen/io/ring.h | 455 +++++++++++++++++++++++++++++++++++++++++++
include/hw/xen/xen_backend.h | 3 +
16 files changed, 912 insertions(+), 13 deletions(-)
create mode 100644 hw/9pfs/xen-9p-backend.c
create mode 100644 include/hw/xen/io/ring.h
^ permalink raw reply [flat|nested] 40+ messages in thread
* [PATCH v3 0/9] xen/9pfs: introduce the Xen 9pfs backend
@ 2017-03-16 20:00 ` Stefano Stabellini
0 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:00 UTC (permalink / raw)
To: qemu-devel
Cc: jgross, sstabellini, groug, aneesh.kumar, anthony.perard, xen-devel
Hi all,
This patch series implements a new transport for 9pfs, aimed at Xen
systems.
The transport is based on a traditional Xen frontend and backend drivers
pair. This patch series implements the backend, which typically runs in
Dom0. I sent another series to implement the frontend in Linux
(http://marc.info/?l=linux-kernel&m=148883047125960&w=2).
The backend complies to the Xen transport for 9pfs specification
version 1, available here:
http://xenbits.xen.org/gitweb/?p=xen.git;a=blob_plain;f=docs/misc/9pfs.markdown;hb=HEAD
Changes in v3:
- do not build backends for targets that do not support xen
- remove xen_9pfs.h, merge its content into xen-9p-backend.c
- remove xen_9pfs_header, introduce P9MsgHeader
- use le32_to_cpu to access P9MsgHeader fields
- many coding style fixes
- run checkpatch on all patches
- add check if num_rings < 1
- use g_strdup_printf
- free fsdev_id in xen_9pfs_free
- add comments
Changes in v2:
- fix coding style
- compile xen-9p-backend.c if CONFIG_XEN_BACKEND
- add patch to set CONFIG_XEN_BACKEND only for the right targets
- add review-bys
Stefano Stabellini (9):
xen: do not build backends for targets that do not support xen
xen: import ring.h from xen
9p: introduce a type for the 9p header
xen/9pfs: introduce Xen 9pfs backend
xen/9pfs: connect to the frontend
xen/9pfs: receive requests from the frontend
xen/9pfs: implement in/out_iov_from_pdu and vmarshal/vunmarshal
xen/9pfs: send responses back to the frontend
xen/9pfs: build and register Xen 9pfs backend
Makefile | 1 +
hw/9pfs/9p.h | 6 +
hw/9pfs/Makefile.objs | 1 +
hw/9pfs/virtio-9p-device.c | 6 +-
hw/9pfs/xen-9p-backend.c | 434 +++++++++++++++++++++++++++++++++++++++++
hw/block/Makefile.objs | 2 +-
hw/block/xen_blkif.h | 2 +-
hw/char/Makefile.objs | 2 +-
hw/display/Makefile.objs | 2 +-
hw/net/Makefile.objs | 2 +-
hw/usb/Makefile.objs | 2 +-
hw/usb/xen-usb.c | 2 +-
hw/xen/Makefile.objs | 2 +-
hw/xen/xen_backend.c | 3 +
include/hw/xen/io/ring.h | 455 +++++++++++++++++++++++++++++++++++++++++++
include/hw/xen/xen_backend.h | 3 +
16 files changed, 912 insertions(+), 13 deletions(-)
create mode 100644 hw/9pfs/xen-9p-backend.c
create mode 100644 include/hw/xen/io/ring.h
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 40+ messages in thread
* [Qemu-devel] [PATCH v3 1/9] xen: do not build backends for targets that do not support xen
2017-03-16 20:00 ` Stefano Stabellini
@ 2017-03-16 20:01 ` Stefano Stabellini
-1 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:01 UTC (permalink / raw)
To: qemu-devel
Cc: xen-devel, sstabellini, jgross, groug, Stefano Stabellini,
pbonzini, peter.maydell, rth, stefanha
Change Makefile.objs to use CONFIG_XEN instead of CONFIG_XEN_BACKEND, so
that the Xen backends are only built for targets that support Xen.
Set CONFIG_XEN in the toplevel Makefile to ensure that files that are
built only once pick up Xen support properly.
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: groug@kaod.org
CC: pbonzini@redhat.com
CC: peter.maydell@linaro.org
CC: rth@twiddle.net
CC: stefanha@redhat.com
---
Makefile | 1 +
hw/block/Makefile.objs | 2 +-
hw/char/Makefile.objs | 2 +-
hw/display/Makefile.objs | 2 +-
hw/net/Makefile.objs | 2 +-
hw/usb/Makefile.objs | 2 +-
hw/xen/Makefile.objs | 2 +-
7 files changed, 7 insertions(+), 6 deletions(-)
diff --git a/Makefile b/Makefile
index 1c4c04f..b246138 100644
--- a/Makefile
+++ b/Makefile
@@ -26,6 +26,7 @@ endif
CONFIG_SOFTMMU := $(if $(filter %-softmmu,$(TARGET_DIRS)),y)
CONFIG_USER_ONLY := $(if $(filter %-user,$(TARGET_DIRS)),y)
+CONFIG_XEN := $(CONFIG_XEN_BACKEND)
CONFIG_ALL=y
-include config-all-devices.mak
-include config-all-disas.mak
diff --git a/hw/block/Makefile.objs b/hw/block/Makefile.objs
index d4c3ab7..e0ed980 100644
--- a/hw/block/Makefile.objs
+++ b/hw/block/Makefile.objs
@@ -4,7 +4,7 @@ common-obj-$(CONFIG_SSI_M25P80) += m25p80.o
common-obj-$(CONFIG_NAND) += nand.o
common-obj-$(CONFIG_PFLASH_CFI01) += pflash_cfi01.o
common-obj-$(CONFIG_PFLASH_CFI02) += pflash_cfi02.o
-common-obj-$(CONFIG_XEN_BACKEND) += xen_disk.o
+common-obj-$(CONFIG_XEN) += xen_disk.o
common-obj-$(CONFIG_ECC) += ecc.o
common-obj-$(CONFIG_ONENAND) += onenand.o
common-obj-$(CONFIG_NVME_PCI) += nvme.o
diff --git a/hw/char/Makefile.objs b/hw/char/Makefile.objs
index 6ea76fe..725fdc4 100644
--- a/hw/char/Makefile.objs
+++ b/hw/char/Makefile.objs
@@ -7,7 +7,7 @@ common-obj-$(CONFIG_SERIAL_ISA) += serial-isa.o
common-obj-$(CONFIG_SERIAL_PCI) += serial-pci.o
common-obj-$(CONFIG_VIRTIO) += virtio-console.o
common-obj-$(CONFIG_XILINX) += xilinx_uartlite.o
-common-obj-$(CONFIG_XEN_BACKEND) += xen_console.o
+common-obj-$(CONFIG_XEN) += xen_console.o
common-obj-$(CONFIG_CADENCE) += cadence_uart.o
obj-$(CONFIG_EXYNOS4) += exynos4210_uart.o
diff --git a/hw/display/Makefile.objs b/hw/display/Makefile.objs
index 063889b..3d02e8b 100644
--- a/hw/display/Makefile.objs
+++ b/hw/display/Makefile.objs
@@ -5,7 +5,7 @@ common-obj-$(CONFIG_JAZZ_LED) += jazz_led.o
common-obj-$(CONFIG_PL110) += pl110.o
common-obj-$(CONFIG_SSD0303) += ssd0303.o
common-obj-$(CONFIG_SSD0323) += ssd0323.o
-common-obj-$(CONFIG_XEN_BACKEND) += xenfb.o
+common-obj-$(CONFIG_XEN) += xenfb.o
common-obj-$(CONFIG_VGA_PCI) += vga-pci.o
common-obj-$(CONFIG_VGA_ISA) += vga-isa.o
diff --git a/hw/net/Makefile.objs b/hw/net/Makefile.objs
index 610ed3e..6a95d92 100644
--- a/hw/net/Makefile.objs
+++ b/hw/net/Makefile.objs
@@ -1,5 +1,5 @@
common-obj-$(CONFIG_DP8393X) += dp8393x.o
-common-obj-$(CONFIG_XEN_BACKEND) += xen_nic.o
+common-obj-$(CONFIG_XEN) += xen_nic.o
# PCI network cards
common-obj-$(CONFIG_NE2000_PCI) += ne2000.o
diff --git a/hw/usb/Makefile.objs b/hw/usb/Makefile.objs
index 98b5c9d..5958be8 100644
--- a/hw/usb/Makefile.objs
+++ b/hw/usb/Makefile.objs
@@ -40,5 +40,5 @@ common-obj-$(CONFIG_USB_REDIR) += redirect.o quirks.o
common-obj-y += $(patsubst %,host-%.o,$(HOST_USB))
ifeq ($(CONFIG_USB_LIBUSB),y)
-common-obj-$(CONFIG_XEN_BACKEND) += xen-usb.o
+common-obj-$(CONFIG_XEN) += xen-usb.o
endif
diff --git a/hw/xen/Makefile.objs b/hw/xen/Makefile.objs
index 591cdc2..4be3ec9 100644
--- a/hw/xen/Makefile.objs
+++ b/hw/xen/Makefile.objs
@@ -1,5 +1,5 @@
# xen backend driver support
-common-obj-$(CONFIG_XEN_BACKEND) += xen_backend.o xen_devconfig.o xen_pvdev.o
+common-obj-$(CONFIG_XEN) += xen_backend.o xen_devconfig.o xen_pvdev.o
obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen-host-pci-device.o
obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pt.o xen_pt_config_init.o xen_pt_graphics.o xen_pt_msi.o
--
1.9.1
^ permalink raw reply related [flat|nested] 40+ messages in thread
* [PATCH v3 1/9] xen: do not build backends for targets that do not support xen
@ 2017-03-16 20:01 ` Stefano Stabellini
0 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:01 UTC (permalink / raw)
To: qemu-devel
Cc: jgross, peter.maydell, sstabellini, groug, Stefano Stabellini,
stefanha, pbonzini, xen-devel, rth
Change Makefile.objs to use CONFIG_XEN instead of CONFIG_XEN_BACKEND, so
that the Xen backends are only built for targets that support Xen.
Set CONFIG_XEN in the toplevel Makefile to ensure that files that are
built only once pick up Xen support properly.
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: groug@kaod.org
CC: pbonzini@redhat.com
CC: peter.maydell@linaro.org
CC: rth@twiddle.net
CC: stefanha@redhat.com
---
Makefile | 1 +
hw/block/Makefile.objs | 2 +-
hw/char/Makefile.objs | 2 +-
hw/display/Makefile.objs | 2 +-
hw/net/Makefile.objs | 2 +-
hw/usb/Makefile.objs | 2 +-
hw/xen/Makefile.objs | 2 +-
7 files changed, 7 insertions(+), 6 deletions(-)
diff --git a/Makefile b/Makefile
index 1c4c04f..b246138 100644
--- a/Makefile
+++ b/Makefile
@@ -26,6 +26,7 @@ endif
CONFIG_SOFTMMU := $(if $(filter %-softmmu,$(TARGET_DIRS)),y)
CONFIG_USER_ONLY := $(if $(filter %-user,$(TARGET_DIRS)),y)
+CONFIG_XEN := $(CONFIG_XEN_BACKEND)
CONFIG_ALL=y
-include config-all-devices.mak
-include config-all-disas.mak
diff --git a/hw/block/Makefile.objs b/hw/block/Makefile.objs
index d4c3ab7..e0ed980 100644
--- a/hw/block/Makefile.objs
+++ b/hw/block/Makefile.objs
@@ -4,7 +4,7 @@ common-obj-$(CONFIG_SSI_M25P80) += m25p80.o
common-obj-$(CONFIG_NAND) += nand.o
common-obj-$(CONFIG_PFLASH_CFI01) += pflash_cfi01.o
common-obj-$(CONFIG_PFLASH_CFI02) += pflash_cfi02.o
-common-obj-$(CONFIG_XEN_BACKEND) += xen_disk.o
+common-obj-$(CONFIG_XEN) += xen_disk.o
common-obj-$(CONFIG_ECC) += ecc.o
common-obj-$(CONFIG_ONENAND) += onenand.o
common-obj-$(CONFIG_NVME_PCI) += nvme.o
diff --git a/hw/char/Makefile.objs b/hw/char/Makefile.objs
index 6ea76fe..725fdc4 100644
--- a/hw/char/Makefile.objs
+++ b/hw/char/Makefile.objs
@@ -7,7 +7,7 @@ common-obj-$(CONFIG_SERIAL_ISA) += serial-isa.o
common-obj-$(CONFIG_SERIAL_PCI) += serial-pci.o
common-obj-$(CONFIG_VIRTIO) += virtio-console.o
common-obj-$(CONFIG_XILINX) += xilinx_uartlite.o
-common-obj-$(CONFIG_XEN_BACKEND) += xen_console.o
+common-obj-$(CONFIG_XEN) += xen_console.o
common-obj-$(CONFIG_CADENCE) += cadence_uart.o
obj-$(CONFIG_EXYNOS4) += exynos4210_uart.o
diff --git a/hw/display/Makefile.objs b/hw/display/Makefile.objs
index 063889b..3d02e8b 100644
--- a/hw/display/Makefile.objs
+++ b/hw/display/Makefile.objs
@@ -5,7 +5,7 @@ common-obj-$(CONFIG_JAZZ_LED) += jazz_led.o
common-obj-$(CONFIG_PL110) += pl110.o
common-obj-$(CONFIG_SSD0303) += ssd0303.o
common-obj-$(CONFIG_SSD0323) += ssd0323.o
-common-obj-$(CONFIG_XEN_BACKEND) += xenfb.o
+common-obj-$(CONFIG_XEN) += xenfb.o
common-obj-$(CONFIG_VGA_PCI) += vga-pci.o
common-obj-$(CONFIG_VGA_ISA) += vga-isa.o
diff --git a/hw/net/Makefile.objs b/hw/net/Makefile.objs
index 610ed3e..6a95d92 100644
--- a/hw/net/Makefile.objs
+++ b/hw/net/Makefile.objs
@@ -1,5 +1,5 @@
common-obj-$(CONFIG_DP8393X) += dp8393x.o
-common-obj-$(CONFIG_XEN_BACKEND) += xen_nic.o
+common-obj-$(CONFIG_XEN) += xen_nic.o
# PCI network cards
common-obj-$(CONFIG_NE2000_PCI) += ne2000.o
diff --git a/hw/usb/Makefile.objs b/hw/usb/Makefile.objs
index 98b5c9d..5958be8 100644
--- a/hw/usb/Makefile.objs
+++ b/hw/usb/Makefile.objs
@@ -40,5 +40,5 @@ common-obj-$(CONFIG_USB_REDIR) += redirect.o quirks.o
common-obj-y += $(patsubst %,host-%.o,$(HOST_USB))
ifeq ($(CONFIG_USB_LIBUSB),y)
-common-obj-$(CONFIG_XEN_BACKEND) += xen-usb.o
+common-obj-$(CONFIG_XEN) += xen-usb.o
endif
diff --git a/hw/xen/Makefile.objs b/hw/xen/Makefile.objs
index 591cdc2..4be3ec9 100644
--- a/hw/xen/Makefile.objs
+++ b/hw/xen/Makefile.objs
@@ -1,5 +1,5 @@
# xen backend driver support
-common-obj-$(CONFIG_XEN_BACKEND) += xen_backend.o xen_devconfig.o xen_pvdev.o
+common-obj-$(CONFIG_XEN) += xen_backend.o xen_devconfig.o xen_pvdev.o
obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen-host-pci-device.o
obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pt.o xen_pt_config_init.o xen_pt_graphics.o xen_pt_msi.o
--
1.9.1
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 40+ messages in thread
* [Qemu-devel] [PATCH v3 2/9] xen: import ring.h from xen
2017-03-16 20:01 ` Stefano Stabellini
@ 2017-03-16 20:01 ` Stefano Stabellini
-1 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:01 UTC (permalink / raw)
To: qemu-devel
Cc: xen-devel, sstabellini, jgross, groug, Stefano Stabellini,
anthony.perard
Do not use the ring.h header installed on the system. Instead, import
the header into the QEMU codebase. This avoids problems when QEMU is
built against a Xen version too old to provide all the ring macros.
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
---
NB: The new macros have not been committed to Xen yet. Do not apply this
patch until they do.
---
---
hw/block/xen_blkif.h | 2 +-
hw/usb/xen-usb.c | 2 +-
include/hw/xen/io/ring.h | 455 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 457 insertions(+), 2 deletions(-)
create mode 100644 include/hw/xen/io/ring.h
diff --git a/hw/block/xen_blkif.h b/hw/block/xen_blkif.h
index 3300b6f..3e6e1ea 100644
--- a/hw/block/xen_blkif.h
+++ b/hw/block/xen_blkif.h
@@ -1,7 +1,7 @@
#ifndef XEN_BLKIF_H
#define XEN_BLKIF_H
-#include <xen/io/ring.h>
+#include "hw/xen/io/ring.h"
#include <xen/io/blkif.h>
#include <xen/io/protocols.h>
diff --git a/hw/usb/xen-usb.c b/hw/usb/xen-usb.c
index 8e676e6..370b3d9 100644
--- a/hw/usb/xen-usb.c
+++ b/hw/usb/xen-usb.c
@@ -33,7 +33,7 @@
#include "qapi/qmp/qint.h"
#include "qapi/qmp/qstring.h"
-#include <xen/io/ring.h>
+#include "hw/xen/io/ring.h"
#include <xen/io/usbif.h>
/*
diff --git a/include/hw/xen/io/ring.h b/include/hw/xen/io/ring.h
new file mode 100644
index 0000000..cf01fc3
--- /dev/null
+++ b/include/hw/xen/io/ring.h
@@ -0,0 +1,455 @@
+/******************************************************************************
+ * ring.h
+ *
+ * Shared producer-consumer ring macros.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Tim Deegan and Andrew Warfield November 2004.
+ */
+
+#ifndef __XEN_PUBLIC_IO_RING_H__
+#define __XEN_PUBLIC_IO_RING_H__
+
+#if __XEN_INTERFACE_VERSION__ < 0x00030208
+#define xen_mb() mb()
+#define xen_rmb() rmb()
+#define xen_wmb() wmb()
+#endif
+
+typedef unsigned int RING_IDX;
+
+/* Round a 32-bit unsigned constant down to the nearest power of two. */
+#define __RD2(_x) (((_x) & 0x00000002) ? 0x2 : ((_x) & 0x1))
+#define __RD4(_x) (((_x) & 0x0000000c) ? __RD2((_x)>>2)<<2 : __RD2(_x))
+#define __RD8(_x) (((_x) & 0x000000f0) ? __RD4((_x)>>4)<<4 : __RD4(_x))
+#define __RD16(_x) (((_x) & 0x0000ff00) ? __RD8((_x)>>8)<<8 : __RD8(_x))
+#define __RD32(_x) (((_x) & 0xffff0000) ? __RD16((_x)>>16)<<16 : __RD16(_x))
+
+/*
+ * Calculate size of a shared ring, given the total available space for the
+ * ring and indexes (_sz), and the name tag of the request/response structure.
+ * A ring contains as many entries as will fit, rounded down to the nearest
+ * power of two (so we can mask with (size-1) to loop around).
+ */
+#define __CONST_RING_SIZE(_s, _sz) \
+ (__RD32(((_sz) - offsetof(struct _s##_sring, ring)) / \
+ sizeof(((struct _s##_sring *)0)->ring[0])))
+/*
+ * The same for passing in an actual pointer instead of a name tag.
+ */
+#define __RING_SIZE(_s, _sz) \
+ (__RD32(((_sz) - (long)(_s)->ring + (long)(_s)) / sizeof((_s)->ring[0])))
+
+/*
+ * Macros to make the correct C datatypes for a new kind of ring.
+ *
+ * To make a new ring datatype, you need to have two message structures,
+ * let's say request_t, and response_t already defined.
+ *
+ * In a header where you want the ring datatype declared, you then do:
+ *
+ * DEFINE_RING_TYPES(mytag, request_t, response_t);
+ *
+ * These expand out to give you a set of types, as you can see below.
+ * The most important of these are:
+ *
+ * mytag_sring_t - The shared ring.
+ * mytag_front_ring_t - The 'front' half of the ring.
+ * mytag_back_ring_t - The 'back' half of the ring.
+ *
+ * To initialize a ring in your code you need to know the location and size
+ * of the shared memory area (PAGE_SIZE, for instance). To initialise
+ * the front half:
+ *
+ * mytag_front_ring_t front_ring;
+ * SHARED_RING_INIT((mytag_sring_t *)shared_page);
+ * FRONT_RING_INIT(&front_ring, (mytag_sring_t *)shared_page, PAGE_SIZE);
+ *
+ * Initializing the back follows similarly (note that only the front
+ * initializes the shared ring):
+ *
+ * mytag_back_ring_t back_ring;
+ * BACK_RING_INIT(&back_ring, (mytag_sring_t *)shared_page, PAGE_SIZE);
+ */
+
+#define DEFINE_RING_TYPES(__name, __req_t, __rsp_t) \
+ \
+/* Shared ring entry */ \
+union __name##_sring_entry { \
+ __req_t req; \
+ __rsp_t rsp; \
+}; \
+ \
+/* Shared ring page */ \
+struct __name##_sring { \
+ RING_IDX req_prod, req_event; \
+ RING_IDX rsp_prod, rsp_event; \
+ union { \
+ struct { \
+ uint8_t smartpoll_active; \
+ } netif; \
+ struct { \
+ uint8_t msg; \
+ } tapif_user; \
+ uint8_t pvt_pad[4]; \
+ } pvt; \
+ uint8_t __pad[44]; \
+ union __name##_sring_entry ring[1]; /* variable-length */ \
+}; \
+ \
+/* "Front" end's private variables */ \
+struct __name##_front_ring { \
+ RING_IDX req_prod_pvt; \
+ RING_IDX rsp_cons; \
+ unsigned int nr_ents; \
+ struct __name##_sring *sring; \
+}; \
+ \
+/* "Back" end's private variables */ \
+struct __name##_back_ring { \
+ RING_IDX rsp_prod_pvt; \
+ RING_IDX req_cons; \
+ unsigned int nr_ents; \
+ struct __name##_sring *sring; \
+}; \
+ \
+/* Syntactic sugar */ \
+typedef struct __name##_sring __name##_sring_t; \
+typedef struct __name##_front_ring __name##_front_ring_t; \
+typedef struct __name##_back_ring __name##_back_ring_t
+
+/*
+ * Macros for manipulating rings.
+ *
+ * FRONT_RING_whatever works on the "front end" of a ring: here
+ * requests are pushed on to the ring and responses taken off it.
+ *
+ * BACK_RING_whatever works on the "back end" of a ring: here
+ * requests are taken off the ring and responses put on.
+ *
+ * N.B. these macros do NO INTERLOCKS OR FLOW CONTROL.
+ * This is OK in 1-for-1 request-response situations where the
+ * requestor (front end) never has more than RING_SIZE()-1
+ * outstanding requests.
+ */
+
+/* Initialising empty rings */
+#define SHARED_RING_INIT(_s) do { \
+ (_s)->req_prod = (_s)->rsp_prod = 0; \
+ (_s)->req_event = (_s)->rsp_event = 1; \
+ (void)memset((_s)->pvt.pvt_pad, 0, sizeof((_s)->pvt.pvt_pad)); \
+ (void)memset((_s)->__pad, 0, sizeof((_s)->__pad)); \
+} while(0)
+
+#define FRONT_RING_INIT(_r, _s, __size) do { \
+ (_r)->req_prod_pvt = 0; \
+ (_r)->rsp_cons = 0; \
+ (_r)->nr_ents = __RING_SIZE(_s, __size); \
+ (_r)->sring = (_s); \
+} while (0)
+
+#define BACK_RING_INIT(_r, _s, __size) do { \
+ (_r)->rsp_prod_pvt = 0; \
+ (_r)->req_cons = 0; \
+ (_r)->nr_ents = __RING_SIZE(_s, __size); \
+ (_r)->sring = (_s); \
+} while (0)
+
+/* How big is this ring? */
+#define RING_SIZE(_r) \
+ ((_r)->nr_ents)
+
+/* Number of free requests (for use on front side only). */
+#define RING_FREE_REQUESTS(_r) \
+ (RING_SIZE(_r) - ((_r)->req_prod_pvt - (_r)->rsp_cons))
+
+/* Test if there is an empty slot available on the front ring.
+ * (This is only meaningful from the front. )
+ */
+#define RING_FULL(_r) \
+ (RING_FREE_REQUESTS(_r) == 0)
+
+/* Test if there are outstanding messages to be processed on a ring. */
+#define RING_HAS_UNCONSUMED_RESPONSES(_r) \
+ ((_r)->sring->rsp_prod - (_r)->rsp_cons)
+
+#ifdef __GNUC__
+#define RING_HAS_UNCONSUMED_REQUESTS(_r) ({ \
+ unsigned int req = (_r)->sring->req_prod - (_r)->req_cons; \
+ unsigned int rsp = RING_SIZE(_r) - \
+ ((_r)->req_cons - (_r)->rsp_prod_pvt); \
+ req < rsp ? req : rsp; \
+})
+#else
+/* Same as above, but without the nice GCC ({ ... }) syntax. */
+#define RING_HAS_UNCONSUMED_REQUESTS(_r) \
+ ((((_r)->sring->req_prod - (_r)->req_cons) < \
+ (RING_SIZE(_r) - ((_r)->req_cons - (_r)->rsp_prod_pvt))) ? \
+ ((_r)->sring->req_prod - (_r)->req_cons) : \
+ (RING_SIZE(_r) - ((_r)->req_cons - (_r)->rsp_prod_pvt)))
+#endif
+
+/* Direct access to individual ring elements, by index. */
+#define RING_GET_REQUEST(_r, _idx) \
+ (&((_r)->sring->ring[((_idx) & (RING_SIZE(_r) - 1))].req))
+
+/*
+ * Get a local copy of a request.
+ *
+ * Use this in preference to RING_GET_REQUEST() so all processing is
+ * done on a local copy that cannot be modified by the other end.
+ *
+ * Note that https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145 may cause this
+ * to be ineffective where _req is a struct which consists of only bitfields.
+ */
+#define RING_COPY_REQUEST(_r, _idx, _req) do { \
+ /* Use volatile to force the copy into _req. */ \
+ *(_req) = *(volatile typeof(_req))RING_GET_REQUEST(_r, _idx); \
+} while (0)
+
+#define RING_GET_RESPONSE(_r, _idx) \
+ (&((_r)->sring->ring[((_idx) & (RING_SIZE(_r) - 1))].rsp))
+
+/* Loop termination condition: Would the specified index overflow the ring? */
+#define RING_REQUEST_CONS_OVERFLOW(_r, _cons) \
+ (((_cons) - (_r)->rsp_prod_pvt) >= RING_SIZE(_r))
+
+/* Ill-behaved frontend determination: Can there be this many requests? */
+#define RING_REQUEST_PROD_OVERFLOW(_r, _prod) \
+ (((_prod) - (_r)->rsp_prod_pvt) > RING_SIZE(_r))
+
+#define RING_PUSH_REQUESTS(_r) do { \
+ xen_wmb(); /* back sees requests /before/ updated producer index */ \
+ (_r)->sring->req_prod = (_r)->req_prod_pvt; \
+} while (0)
+
+#define RING_PUSH_RESPONSES(_r) do { \
+ xen_wmb(); /* front sees resps /before/ updated producer index */ \
+ (_r)->sring->rsp_prod = (_r)->rsp_prod_pvt; \
+} while (0)
+
+/*
+ * Notification hold-off (req_event and rsp_event):
+ *
+ * When queueing requests or responses on a shared ring, it may not always be
+ * necessary to notify the remote end. For example, if requests are in flight
+ * in a backend, the front may be able to queue further requests without
+ * notifying the back (if the back checks for new requests when it queues
+ * responses).
+ *
+ * When enqueuing requests or responses:
+ *
+ * Use RING_PUSH_{REQUESTS,RESPONSES}_AND_CHECK_NOTIFY(). The second argument
+ * is a boolean return value. True indicates that the receiver requires an
+ * asynchronous notification.
+ *
+ * After dequeuing requests or responses (before sleeping the connection):
+ *
+ * Use RING_FINAL_CHECK_FOR_REQUESTS() or RING_FINAL_CHECK_FOR_RESPONSES().
+ * The second argument is a boolean return value. True indicates that there
+ * are pending messages on the ring (i.e., the connection should not be put
+ * to sleep).
+ *
+ * These macros will set the req_event/rsp_event field to trigger a
+ * notification on the very next message that is enqueued. If you want to
+ * create batches of work (i.e., only receive a notification after several
+ * messages have been enqueued) then you will need to create a customised
+ * version of the FINAL_CHECK macro in your own code, which sets the event
+ * field appropriately.
+ */
+
+#define RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(_r, _notify) do { \
+ RING_IDX __old = (_r)->sring->req_prod; \
+ RING_IDX __new = (_r)->req_prod_pvt; \
+ xen_wmb(); /* back sees requests /before/ updated producer index */ \
+ (_r)->sring->req_prod = __new; \
+ xen_mb(); /* back sees new requests /before/ we check req_event */ \
+ (_notify) = ((RING_IDX)(__new - (_r)->sring->req_event) < \
+ (RING_IDX)(__new - __old)); \
+} while (0)
+
+#define RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(_r, _notify) do { \
+ RING_IDX __old = (_r)->sring->rsp_prod; \
+ RING_IDX __new = (_r)->rsp_prod_pvt; \
+ xen_wmb(); /* front sees resps /before/ updated producer index */ \
+ (_r)->sring->rsp_prod = __new; \
+ xen_mb(); /* front sees new resps /before/ we check rsp_event */ \
+ (_notify) = ((RING_IDX)(__new - (_r)->sring->rsp_event) < \
+ (RING_IDX)(__new - __old)); \
+} while (0)
+
+#define RING_FINAL_CHECK_FOR_REQUESTS(_r, _work_to_do) do { \
+ (_work_to_do) = RING_HAS_UNCONSUMED_REQUESTS(_r); \
+ if (_work_to_do) break; \
+ (_r)->sring->req_event = (_r)->req_cons + 1; \
+ xen_mb(); \
+ (_work_to_do) = RING_HAS_UNCONSUMED_REQUESTS(_r); \
+} while (0)
+
+#define RING_FINAL_CHECK_FOR_RESPONSES(_r, _work_to_do) do { \
+ (_work_to_do) = RING_HAS_UNCONSUMED_RESPONSES(_r); \
+ if (_work_to_do) break; \
+ (_r)->sring->rsp_event = (_r)->rsp_cons + 1; \
+ xen_mb(); \
+ (_work_to_do) = RING_HAS_UNCONSUMED_RESPONSES(_r); \
+} while (0)
+
+
+/*
+ * DEFINE_XEN_FLEX_RING_AND_INTF defines two monodirectional rings and
+ * functions to check if there is data on the ring, and to read and
+ * write to them.
+ *
+ * DEFINE_XEN_FLEX_RING is similar to DEFINE_XEN_FLEX_RING_AND_INTF, but
+ * does not define the indexes page. As different protocols can have
+ * extensions to the basic format, this macro allow them to define their
+ * own struct.
+ *
+ * XEN_FLEX_RING_SIZE
+ * Convenience macro to calculate the size of one of the two rings
+ * from the overall order.
+ *
+ * $NAME_mask
+ * Function to apply the size mask to an index, to reduce the index
+ * within the range [0-size].
+ *
+ * $NAME_read_packet
+ * Function to read data from the ring. The amount of data to read is
+ * specified by the "size" argument.
+ *
+ * $NAME_write_packet
+ * Function to write data to the ring. The amount of data to write is
+ * specified by the "size" argument.
+ *
+ * $NAME_get_ring_ptr
+ * Convenience function that returns a pointer to read/write to the
+ * ring at the right location.
+ *
+ * $NAME_data_intf
+ * Indexes page, shared between frontend and backend. It also
+ * contains the array of grant refs.
+ *
+ * $NAME_queued
+ * Function to calculate how many bytes are currently on the ring,
+ * ready to be read. It can also be used to calculate how much free
+ * space is currently on the ring (ring_size - $NAME_queued()).
+ */
+#define XEN_FLEX_RING_SIZE(order) \
+ (1UL << (order + PAGE_SHIFT - 1))
+
+#define DEFINE_XEN_FLEX_RING_AND_INTF(name) \
+struct name##_data_intf { \
+ RING_IDX in_cons, in_prod; \
+ \
+ uint8_t pad1[56]; \
+ \
+ RING_IDX out_cons, out_prod; \
+ \
+ uint8_t pad2[56]; \
+ \
+ RING_IDX ring_order; \
+ grant_ref_t ref[]; \
+}; \
+DEFINE_XEN_FLEX_RING(name);
+
+#define DEFINE_XEN_FLEX_RING(name) \
+static inline RING_IDX name##_mask(RING_IDX idx, RING_IDX ring_size) \
+{ \
+ return (idx & (ring_size - 1)); \
+} \
+ \
+static inline RING_IDX name##_mask_order(RING_IDX idx, RING_IDX ring_order) \
+{ \
+ return (idx & (XEN_FLEX_RING_SIZE(ring_order) - 1)); \
+} \
+ \
+static inline unsigned char* name##_get_ring_ptr(unsigned char *buf, \
+ RING_IDX idx, \
+ RING_IDX ring_order) \
+{ \
+ return buf + name##_mask_order(idx, ring_order); \
+} \
+ \
+static inline void name##_read_packet(const unsigned char *buf, \
+ RING_IDX masked_prod, RING_IDX *masked_cons, \
+ RING_IDX ring_size, void *opaque, size_t size) { \
+ if (*masked_cons < masked_prod || \
+ size <= ring_size - *masked_cons) { \
+ memcpy(opaque, buf + *masked_cons, size); \
+ } else { \
+ memcpy(opaque, buf + *masked_cons, ring_size - *masked_cons); \
+ memcpy((unsigned char *)opaque + ring_size - *masked_cons, buf, \
+ size - (ring_size - *masked_cons)); \
+ } \
+ *masked_cons = name##_mask(*masked_cons + size, ring_size); \
+} \
+ \
+static inline void name##_write_packet(unsigned char *buf, \
+ RING_IDX *masked_prod, RING_IDX masked_cons, \
+ RING_IDX ring_size, const void *opaque, size_t size) { \
+ if (*masked_prod < masked_cons || \
+ size <= ring_size - *masked_prod) { \
+ memcpy(buf + *masked_prod, opaque, size); \
+ } else { \
+ memcpy(buf + *masked_prod, opaque, ring_size - *masked_prod); \
+ memcpy(buf, (unsigned char *)opaque + (ring_size - *masked_prod), \
+ size - (ring_size - *masked_prod)); \
+ } \
+ *masked_prod = name##_mask(*masked_prod + size, ring_size); \
+} \
+ \
+struct name##_data { \
+ unsigned char *in; /* half of the allocation */ \
+ unsigned char *out; /* half of the allocation */ \
+}; \
+ \
+ \
+static inline RING_IDX name##_queued(RING_IDX prod, \
+ RING_IDX cons, RING_IDX ring_size) \
+{ \
+ RING_IDX size; \
+ \
+ if (prod == cons) \
+ return 0; \
+ \
+ prod = name##_mask(prod, ring_size); \
+ cons = name##_mask(cons, ring_size); \
+ \
+ if (prod == cons) \
+ return ring_size; \
+ \
+ if (prod > cons) \
+ size = prod - cons; \
+ else \
+ size = ring_size - (cons - prod); \
+ return size; \
+};
+
+#endif /* __XEN_PUBLIC_IO_RING_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--
1.9.1
^ permalink raw reply related [flat|nested] 40+ messages in thread
* [PATCH v3 2/9] xen: import ring.h from xen
@ 2017-03-16 20:01 ` Stefano Stabellini
0 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:01 UTC (permalink / raw)
To: qemu-devel
Cc: jgross, sstabellini, groug, Stefano Stabellini, anthony.perard,
xen-devel
Do not use the ring.h header installed on the system. Instead, import
the header into the QEMU codebase. This avoids problems when QEMU is
built against a Xen version too old to provide all the ring macros.
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
---
NB: The new macros have not been committed to Xen yet. Do not apply this
patch until they do.
---
---
hw/block/xen_blkif.h | 2 +-
hw/usb/xen-usb.c | 2 +-
include/hw/xen/io/ring.h | 455 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 457 insertions(+), 2 deletions(-)
create mode 100644 include/hw/xen/io/ring.h
diff --git a/hw/block/xen_blkif.h b/hw/block/xen_blkif.h
index 3300b6f..3e6e1ea 100644
--- a/hw/block/xen_blkif.h
+++ b/hw/block/xen_blkif.h
@@ -1,7 +1,7 @@
#ifndef XEN_BLKIF_H
#define XEN_BLKIF_H
-#include <xen/io/ring.h>
+#include "hw/xen/io/ring.h"
#include <xen/io/blkif.h>
#include <xen/io/protocols.h>
diff --git a/hw/usb/xen-usb.c b/hw/usb/xen-usb.c
index 8e676e6..370b3d9 100644
--- a/hw/usb/xen-usb.c
+++ b/hw/usb/xen-usb.c
@@ -33,7 +33,7 @@
#include "qapi/qmp/qint.h"
#include "qapi/qmp/qstring.h"
-#include <xen/io/ring.h>
+#include "hw/xen/io/ring.h"
#include <xen/io/usbif.h>
/*
diff --git a/include/hw/xen/io/ring.h b/include/hw/xen/io/ring.h
new file mode 100644
index 0000000..cf01fc3
--- /dev/null
+++ b/include/hw/xen/io/ring.h
@@ -0,0 +1,455 @@
+/******************************************************************************
+ * ring.h
+ *
+ * Shared producer-consumer ring macros.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Tim Deegan and Andrew Warfield November 2004.
+ */
+
+#ifndef __XEN_PUBLIC_IO_RING_H__
+#define __XEN_PUBLIC_IO_RING_H__
+
+#if __XEN_INTERFACE_VERSION__ < 0x00030208
+#define xen_mb() mb()
+#define xen_rmb() rmb()
+#define xen_wmb() wmb()
+#endif
+
+typedef unsigned int RING_IDX;
+
+/* Round a 32-bit unsigned constant down to the nearest power of two. */
+#define __RD2(_x) (((_x) & 0x00000002) ? 0x2 : ((_x) & 0x1))
+#define __RD4(_x) (((_x) & 0x0000000c) ? __RD2((_x)>>2)<<2 : __RD2(_x))
+#define __RD8(_x) (((_x) & 0x000000f0) ? __RD4((_x)>>4)<<4 : __RD4(_x))
+#define __RD16(_x) (((_x) & 0x0000ff00) ? __RD8((_x)>>8)<<8 : __RD8(_x))
+#define __RD32(_x) (((_x) & 0xffff0000) ? __RD16((_x)>>16)<<16 : __RD16(_x))
+
+/*
+ * Calculate size of a shared ring, given the total available space for the
+ * ring and indexes (_sz), and the name tag of the request/response structure.
+ * A ring contains as many entries as will fit, rounded down to the nearest
+ * power of two (so we can mask with (size-1) to loop around).
+ */
+#define __CONST_RING_SIZE(_s, _sz) \
+ (__RD32(((_sz) - offsetof(struct _s##_sring, ring)) / \
+ sizeof(((struct _s##_sring *)0)->ring[0])))
+/*
+ * The same for passing in an actual pointer instead of a name tag.
+ */
+#define __RING_SIZE(_s, _sz) \
+ (__RD32(((_sz) - (long)(_s)->ring + (long)(_s)) / sizeof((_s)->ring[0])))
+
+/*
+ * Macros to make the correct C datatypes for a new kind of ring.
+ *
+ * To make a new ring datatype, you need to have two message structures,
+ * let's say request_t, and response_t already defined.
+ *
+ * In a header where you want the ring datatype declared, you then do:
+ *
+ * DEFINE_RING_TYPES(mytag, request_t, response_t);
+ *
+ * These expand out to give you a set of types, as you can see below.
+ * The most important of these are:
+ *
+ * mytag_sring_t - The shared ring.
+ * mytag_front_ring_t - The 'front' half of the ring.
+ * mytag_back_ring_t - The 'back' half of the ring.
+ *
+ * To initialize a ring in your code you need to know the location and size
+ * of the shared memory area (PAGE_SIZE, for instance). To initialise
+ * the front half:
+ *
+ * mytag_front_ring_t front_ring;
+ * SHARED_RING_INIT((mytag_sring_t *)shared_page);
+ * FRONT_RING_INIT(&front_ring, (mytag_sring_t *)shared_page, PAGE_SIZE);
+ *
+ * Initializing the back follows similarly (note that only the front
+ * initializes the shared ring):
+ *
+ * mytag_back_ring_t back_ring;
+ * BACK_RING_INIT(&back_ring, (mytag_sring_t *)shared_page, PAGE_SIZE);
+ */
+
+#define DEFINE_RING_TYPES(__name, __req_t, __rsp_t) \
+ \
+/* Shared ring entry */ \
+union __name##_sring_entry { \
+ __req_t req; \
+ __rsp_t rsp; \
+}; \
+ \
+/* Shared ring page */ \
+struct __name##_sring { \
+ RING_IDX req_prod, req_event; \
+ RING_IDX rsp_prod, rsp_event; \
+ union { \
+ struct { \
+ uint8_t smartpoll_active; \
+ } netif; \
+ struct { \
+ uint8_t msg; \
+ } tapif_user; \
+ uint8_t pvt_pad[4]; \
+ } pvt; \
+ uint8_t __pad[44]; \
+ union __name##_sring_entry ring[1]; /* variable-length */ \
+}; \
+ \
+/* "Front" end's private variables */ \
+struct __name##_front_ring { \
+ RING_IDX req_prod_pvt; \
+ RING_IDX rsp_cons; \
+ unsigned int nr_ents; \
+ struct __name##_sring *sring; \
+}; \
+ \
+/* "Back" end's private variables */ \
+struct __name##_back_ring { \
+ RING_IDX rsp_prod_pvt; \
+ RING_IDX req_cons; \
+ unsigned int nr_ents; \
+ struct __name##_sring *sring; \
+}; \
+ \
+/* Syntactic sugar */ \
+typedef struct __name##_sring __name##_sring_t; \
+typedef struct __name##_front_ring __name##_front_ring_t; \
+typedef struct __name##_back_ring __name##_back_ring_t
+
+/*
+ * Macros for manipulating rings.
+ *
+ * FRONT_RING_whatever works on the "front end" of a ring: here
+ * requests are pushed on to the ring and responses taken off it.
+ *
+ * BACK_RING_whatever works on the "back end" of a ring: here
+ * requests are taken off the ring and responses put on.
+ *
+ * N.B. these macros do NO INTERLOCKS OR FLOW CONTROL.
+ * This is OK in 1-for-1 request-response situations where the
+ * requestor (front end) never has more than RING_SIZE()-1
+ * outstanding requests.
+ */
+
+/* Initialising empty rings */
+#define SHARED_RING_INIT(_s) do { \
+ (_s)->req_prod = (_s)->rsp_prod = 0; \
+ (_s)->req_event = (_s)->rsp_event = 1; \
+ (void)memset((_s)->pvt.pvt_pad, 0, sizeof((_s)->pvt.pvt_pad)); \
+ (void)memset((_s)->__pad, 0, sizeof((_s)->__pad)); \
+} while(0)
+
+#define FRONT_RING_INIT(_r, _s, __size) do { \
+ (_r)->req_prod_pvt = 0; \
+ (_r)->rsp_cons = 0; \
+ (_r)->nr_ents = __RING_SIZE(_s, __size); \
+ (_r)->sring = (_s); \
+} while (0)
+
+#define BACK_RING_INIT(_r, _s, __size) do { \
+ (_r)->rsp_prod_pvt = 0; \
+ (_r)->req_cons = 0; \
+ (_r)->nr_ents = __RING_SIZE(_s, __size); \
+ (_r)->sring = (_s); \
+} while (0)
+
+/* How big is this ring? */
+#define RING_SIZE(_r) \
+ ((_r)->nr_ents)
+
+/* Number of free requests (for use on front side only). */
+#define RING_FREE_REQUESTS(_r) \
+ (RING_SIZE(_r) - ((_r)->req_prod_pvt - (_r)->rsp_cons))
+
+/* Test if there is an empty slot available on the front ring.
+ * (This is only meaningful from the front. )
+ */
+#define RING_FULL(_r) \
+ (RING_FREE_REQUESTS(_r) == 0)
+
+/* Test if there are outstanding messages to be processed on a ring. */
+#define RING_HAS_UNCONSUMED_RESPONSES(_r) \
+ ((_r)->sring->rsp_prod - (_r)->rsp_cons)
+
+#ifdef __GNUC__
+#define RING_HAS_UNCONSUMED_REQUESTS(_r) ({ \
+ unsigned int req = (_r)->sring->req_prod - (_r)->req_cons; \
+ unsigned int rsp = RING_SIZE(_r) - \
+ ((_r)->req_cons - (_r)->rsp_prod_pvt); \
+ req < rsp ? req : rsp; \
+})
+#else
+/* Same as above, but without the nice GCC ({ ... }) syntax. */
+#define RING_HAS_UNCONSUMED_REQUESTS(_r) \
+ ((((_r)->sring->req_prod - (_r)->req_cons) < \
+ (RING_SIZE(_r) - ((_r)->req_cons - (_r)->rsp_prod_pvt))) ? \
+ ((_r)->sring->req_prod - (_r)->req_cons) : \
+ (RING_SIZE(_r) - ((_r)->req_cons - (_r)->rsp_prod_pvt)))
+#endif
+
+/* Direct access to individual ring elements, by index. */
+#define RING_GET_REQUEST(_r, _idx) \
+ (&((_r)->sring->ring[((_idx) & (RING_SIZE(_r) - 1))].req))
+
+/*
+ * Get a local copy of a request.
+ *
+ * Use this in preference to RING_GET_REQUEST() so all processing is
+ * done on a local copy that cannot be modified by the other end.
+ *
+ * Note that https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145 may cause this
+ * to be ineffective where _req is a struct which consists of only bitfields.
+ */
+#define RING_COPY_REQUEST(_r, _idx, _req) do { \
+ /* Use volatile to force the copy into _req. */ \
+ *(_req) = *(volatile typeof(_req))RING_GET_REQUEST(_r, _idx); \
+} while (0)
+
+#define RING_GET_RESPONSE(_r, _idx) \
+ (&((_r)->sring->ring[((_idx) & (RING_SIZE(_r) - 1))].rsp))
+
+/* Loop termination condition: Would the specified index overflow the ring? */
+#define RING_REQUEST_CONS_OVERFLOW(_r, _cons) \
+ (((_cons) - (_r)->rsp_prod_pvt) >= RING_SIZE(_r))
+
+/* Ill-behaved frontend determination: Can there be this many requests? */
+#define RING_REQUEST_PROD_OVERFLOW(_r, _prod) \
+ (((_prod) - (_r)->rsp_prod_pvt) > RING_SIZE(_r))
+
+#define RING_PUSH_REQUESTS(_r) do { \
+ xen_wmb(); /* back sees requests /before/ updated producer index */ \
+ (_r)->sring->req_prod = (_r)->req_prod_pvt; \
+} while (0)
+
+#define RING_PUSH_RESPONSES(_r) do { \
+ xen_wmb(); /* front sees resps /before/ updated producer index */ \
+ (_r)->sring->rsp_prod = (_r)->rsp_prod_pvt; \
+} while (0)
+
+/*
+ * Notification hold-off (req_event and rsp_event):
+ *
+ * When queueing requests or responses on a shared ring, it may not always be
+ * necessary to notify the remote end. For example, if requests are in flight
+ * in a backend, the front may be able to queue further requests without
+ * notifying the back (if the back checks for new requests when it queues
+ * responses).
+ *
+ * When enqueuing requests or responses:
+ *
+ * Use RING_PUSH_{REQUESTS,RESPONSES}_AND_CHECK_NOTIFY(). The second argument
+ * is a boolean return value. True indicates that the receiver requires an
+ * asynchronous notification.
+ *
+ * After dequeuing requests or responses (before sleeping the connection):
+ *
+ * Use RING_FINAL_CHECK_FOR_REQUESTS() or RING_FINAL_CHECK_FOR_RESPONSES().
+ * The second argument is a boolean return value. True indicates that there
+ * are pending messages on the ring (i.e., the connection should not be put
+ * to sleep).
+ *
+ * These macros will set the req_event/rsp_event field to trigger a
+ * notification on the very next message that is enqueued. If you want to
+ * create batches of work (i.e., only receive a notification after several
+ * messages have been enqueued) then you will need to create a customised
+ * version of the FINAL_CHECK macro in your own code, which sets the event
+ * field appropriately.
+ */
+
+#define RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(_r, _notify) do { \
+ RING_IDX __old = (_r)->sring->req_prod; \
+ RING_IDX __new = (_r)->req_prod_pvt; \
+ xen_wmb(); /* back sees requests /before/ updated producer index */ \
+ (_r)->sring->req_prod = __new; \
+ xen_mb(); /* back sees new requests /before/ we check req_event */ \
+ (_notify) = ((RING_IDX)(__new - (_r)->sring->req_event) < \
+ (RING_IDX)(__new - __old)); \
+} while (0)
+
+#define RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(_r, _notify) do { \
+ RING_IDX __old = (_r)->sring->rsp_prod; \
+ RING_IDX __new = (_r)->rsp_prod_pvt; \
+ xen_wmb(); /* front sees resps /before/ updated producer index */ \
+ (_r)->sring->rsp_prod = __new; \
+ xen_mb(); /* front sees new resps /before/ we check rsp_event */ \
+ (_notify) = ((RING_IDX)(__new - (_r)->sring->rsp_event) < \
+ (RING_IDX)(__new - __old)); \
+} while (0)
+
+#define RING_FINAL_CHECK_FOR_REQUESTS(_r, _work_to_do) do { \
+ (_work_to_do) = RING_HAS_UNCONSUMED_REQUESTS(_r); \
+ if (_work_to_do) break; \
+ (_r)->sring->req_event = (_r)->req_cons + 1; \
+ xen_mb(); \
+ (_work_to_do) = RING_HAS_UNCONSUMED_REQUESTS(_r); \
+} while (0)
+
+#define RING_FINAL_CHECK_FOR_RESPONSES(_r, _work_to_do) do { \
+ (_work_to_do) = RING_HAS_UNCONSUMED_RESPONSES(_r); \
+ if (_work_to_do) break; \
+ (_r)->sring->rsp_event = (_r)->rsp_cons + 1; \
+ xen_mb(); \
+ (_work_to_do) = RING_HAS_UNCONSUMED_RESPONSES(_r); \
+} while (0)
+
+
+/*
+ * DEFINE_XEN_FLEX_RING_AND_INTF defines two monodirectional rings and
+ * functions to check if there is data on the ring, and to read and
+ * write to them.
+ *
+ * DEFINE_XEN_FLEX_RING is similar to DEFINE_XEN_FLEX_RING_AND_INTF, but
+ * does not define the indexes page. As different protocols can have
+ * extensions to the basic format, this macro allow them to define their
+ * own struct.
+ *
+ * XEN_FLEX_RING_SIZE
+ * Convenience macro to calculate the size of one of the two rings
+ * from the overall order.
+ *
+ * $NAME_mask
+ * Function to apply the size mask to an index, to reduce the index
+ * within the range [0-size].
+ *
+ * $NAME_read_packet
+ * Function to read data from the ring. The amount of data to read is
+ * specified by the "size" argument.
+ *
+ * $NAME_write_packet
+ * Function to write data to the ring. The amount of data to write is
+ * specified by the "size" argument.
+ *
+ * $NAME_get_ring_ptr
+ * Convenience function that returns a pointer to read/write to the
+ * ring at the right location.
+ *
+ * $NAME_data_intf
+ * Indexes page, shared between frontend and backend. It also
+ * contains the array of grant refs.
+ *
+ * $NAME_queued
+ * Function to calculate how many bytes are currently on the ring,
+ * ready to be read. It can also be used to calculate how much free
+ * space is currently on the ring (ring_size - $NAME_queued()).
+ */
+#define XEN_FLEX_RING_SIZE(order) \
+ (1UL << (order + PAGE_SHIFT - 1))
+
+#define DEFINE_XEN_FLEX_RING_AND_INTF(name) \
+struct name##_data_intf { \
+ RING_IDX in_cons, in_prod; \
+ \
+ uint8_t pad1[56]; \
+ \
+ RING_IDX out_cons, out_prod; \
+ \
+ uint8_t pad2[56]; \
+ \
+ RING_IDX ring_order; \
+ grant_ref_t ref[]; \
+}; \
+DEFINE_XEN_FLEX_RING(name);
+
+#define DEFINE_XEN_FLEX_RING(name) \
+static inline RING_IDX name##_mask(RING_IDX idx, RING_IDX ring_size) \
+{ \
+ return (idx & (ring_size - 1)); \
+} \
+ \
+static inline RING_IDX name##_mask_order(RING_IDX idx, RING_IDX ring_order) \
+{ \
+ return (idx & (XEN_FLEX_RING_SIZE(ring_order) - 1)); \
+} \
+ \
+static inline unsigned char* name##_get_ring_ptr(unsigned char *buf, \
+ RING_IDX idx, \
+ RING_IDX ring_order) \
+{ \
+ return buf + name##_mask_order(idx, ring_order); \
+} \
+ \
+static inline void name##_read_packet(const unsigned char *buf, \
+ RING_IDX masked_prod, RING_IDX *masked_cons, \
+ RING_IDX ring_size, void *opaque, size_t size) { \
+ if (*masked_cons < masked_prod || \
+ size <= ring_size - *masked_cons) { \
+ memcpy(opaque, buf + *masked_cons, size); \
+ } else { \
+ memcpy(opaque, buf + *masked_cons, ring_size - *masked_cons); \
+ memcpy((unsigned char *)opaque + ring_size - *masked_cons, buf, \
+ size - (ring_size - *masked_cons)); \
+ } \
+ *masked_cons = name##_mask(*masked_cons + size, ring_size); \
+} \
+ \
+static inline void name##_write_packet(unsigned char *buf, \
+ RING_IDX *masked_prod, RING_IDX masked_cons, \
+ RING_IDX ring_size, const void *opaque, size_t size) { \
+ if (*masked_prod < masked_cons || \
+ size <= ring_size - *masked_prod) { \
+ memcpy(buf + *masked_prod, opaque, size); \
+ } else { \
+ memcpy(buf + *masked_prod, opaque, ring_size - *masked_prod); \
+ memcpy(buf, (unsigned char *)opaque + (ring_size - *masked_prod), \
+ size - (ring_size - *masked_prod)); \
+ } \
+ *masked_prod = name##_mask(*masked_prod + size, ring_size); \
+} \
+ \
+struct name##_data { \
+ unsigned char *in; /* half of the allocation */ \
+ unsigned char *out; /* half of the allocation */ \
+}; \
+ \
+ \
+static inline RING_IDX name##_queued(RING_IDX prod, \
+ RING_IDX cons, RING_IDX ring_size) \
+{ \
+ RING_IDX size; \
+ \
+ if (prod == cons) \
+ return 0; \
+ \
+ prod = name##_mask(prod, ring_size); \
+ cons = name##_mask(cons, ring_size); \
+ \
+ if (prod == cons) \
+ return ring_size; \
+ \
+ if (prod > cons) \
+ size = prod - cons; \
+ else \
+ size = ring_size - (cons - prod); \
+ return size; \
+};
+
+#endif /* __XEN_PUBLIC_IO_RING_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--
1.9.1
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 40+ messages in thread
* [Qemu-devel] [PATCH v3 3/9] 9p: introduce a type for the 9p header
2017-03-16 20:01 ` Stefano Stabellini
@ 2017-03-16 20:01 ` Stefano Stabellini
-1 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:01 UTC (permalink / raw)
To: qemu-devel
Cc: xen-devel, sstabellini, jgross, groug, Stefano Stabellini,
anthony.perard, Aneesh Kumar K.V
Use the new type in virtio-9p-device.
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
---
hw/9pfs/9p.h | 6 ++++++
hw/9pfs/virtio-9p-device.c | 6 +-----
2 files changed, 7 insertions(+), 5 deletions(-)
diff --git a/hw/9pfs/9p.h b/hw/9pfs/9p.h
index b7e8362..5312d8a 100644
--- a/hw/9pfs/9p.h
+++ b/hw/9pfs/9p.h
@@ -119,6 +119,12 @@ static inline char *rpath(FsContext *ctx, const char *path)
typedef struct V9fsPDU V9fsPDU;
struct V9fsState;
+typedef struct {
+ uint32_t size_le;
+ uint8_t id;
+ uint16_t tag_le;
+} QEMU_PACKED P9MsgHeader;
+
struct V9fsPDU
{
uint32_t size;
diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
index 27a4a32..3782f43 100644
--- a/hw/9pfs/virtio-9p-device.c
+++ b/hw/9pfs/virtio-9p-device.c
@@ -46,11 +46,7 @@ static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
VirtQueueElement *elem;
while ((pdu = pdu_alloc(s))) {
- struct {
- uint32_t size_le;
- uint8_t id;
- uint16_t tag_le;
- } QEMU_PACKED out;
+ P9MsgHeader out;
elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
if (!elem) {
--
1.9.1
^ permalink raw reply related [flat|nested] 40+ messages in thread
* [PATCH v3 3/9] 9p: introduce a type for the 9p header
@ 2017-03-16 20:01 ` Stefano Stabellini
0 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:01 UTC (permalink / raw)
To: qemu-devel
Cc: jgross, sstabellini, groug, Stefano Stabellini, Aneesh Kumar K.V,
anthony.perard, xen-devel
Use the new type in virtio-9p-device.
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
---
hw/9pfs/9p.h | 6 ++++++
hw/9pfs/virtio-9p-device.c | 6 +-----
2 files changed, 7 insertions(+), 5 deletions(-)
diff --git a/hw/9pfs/9p.h b/hw/9pfs/9p.h
index b7e8362..5312d8a 100644
--- a/hw/9pfs/9p.h
+++ b/hw/9pfs/9p.h
@@ -119,6 +119,12 @@ static inline char *rpath(FsContext *ctx, const char *path)
typedef struct V9fsPDU V9fsPDU;
struct V9fsState;
+typedef struct {
+ uint32_t size_le;
+ uint8_t id;
+ uint16_t tag_le;
+} QEMU_PACKED P9MsgHeader;
+
struct V9fsPDU
{
uint32_t size;
diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
index 27a4a32..3782f43 100644
--- a/hw/9pfs/virtio-9p-device.c
+++ b/hw/9pfs/virtio-9p-device.c
@@ -46,11 +46,7 @@ static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
VirtQueueElement *elem;
while ((pdu = pdu_alloc(s))) {
- struct {
- uint32_t size_le;
- uint8_t id;
- uint16_t tag_le;
- } QEMU_PACKED out;
+ P9MsgHeader out;
elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
if (!elem) {
--
1.9.1
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 40+ messages in thread
* [Qemu-devel] [PATCH v3 4/9] xen/9pfs: introduce Xen 9pfs backend
2017-03-16 20:01 ` Stefano Stabellini
@ 2017-03-16 20:01 ` Stefano Stabellini
-1 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:01 UTC (permalink / raw)
To: qemu-devel
Cc: xen-devel, sstabellini, jgross, groug, Stefano Stabellini,
anthony.perard, Aneesh Kumar K.V
Introduce the Xen 9pfs backend: add struct XenDevOps to register as a
Xen backend and add struct V9fsTransport to register as v9fs transport.
All functions are empty stubs for now.
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
---
hw/9pfs/xen-9p-backend.c | 102 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 102 insertions(+)
create mode 100644 hw/9pfs/xen-9p-backend.c
diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
new file mode 100644
index 0000000..92bb805
--- /dev/null
+++ b/hw/9pfs/xen-9p-backend.c
@@ -0,0 +1,102 @@
+/*
+ * Xen 9p backend
+ *
+ * Copyright Aporeto 2017
+ *
+ * Authors:
+ * Stefano Stabellini <stefano@aporeto.com>
+ *
+ */
+
+#include "qemu/osdep.h"
+
+#include "hw/hw.h"
+#include "hw/9pfs/9p.h"
+#include "hw/xen/xen_backend.h"
+#include "hw/xen/io/ring.h"
+#include "qemu/config-file.h"
+#include "fsdev/qemu-fsdev.h"
+#include <xen/io/protocols.h>
+
+#define PAGE_SHIFT XC_PAGE_SHIFT
+#define XEN_9PFS_RING_ORDER 6
+#define XEN_9PFS_RING_SIZE XEN_FLEX_RING_SIZE(XEN_9PFS_RING_ORDER)
+DEFINE_XEN_FLEX_RING_AND_INTF(xen_9pfs);
+
+typedef struct Xen9pfsDev {
+ struct XenDevice xendev; /* must be first */
+} Xen9pfsDev;
+
+static ssize_t xen_9pfs_pdu_vmarshal(V9fsPDU *pdu,
+ size_t offset,
+ const char *fmt,
+ va_list ap)
+{
+ return 0;
+}
+
+static ssize_t xen_9pfs_pdu_vunmarshal(V9fsPDU *pdu,
+ size_t offset,
+ const char *fmt,
+ va_list ap)
+{
+ return 0;
+}
+
+static void xen_9pfs_init_out_iov_from_pdu(V9fsPDU *pdu,
+ struct iovec **piov,
+ unsigned int *pniov)
+{
+}
+
+static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu,
+ struct iovec **piov,
+ unsigned int *pniov,
+ size_t size)
+{
+}
+
+static void xen_9pfs_push_and_notify(V9fsPDU *pdu)
+{
+}
+
+static const struct V9fsTransport xen_9p_transport = {
+ .pdu_vmarshal = xen_9pfs_pdu_vmarshal,
+ .pdu_vunmarshal = xen_9pfs_pdu_vunmarshal,
+ .init_in_iov_from_pdu = xen_9pfs_init_in_iov_from_pdu,
+ .init_out_iov_from_pdu = xen_9pfs_init_out_iov_from_pdu,
+ .push_and_notify = xen_9pfs_push_and_notify,
+};
+
+static int xen_9pfs_init(struct XenDevice *xendev)
+{
+ return 0;
+}
+
+static int xen_9pfs_free(struct XenDevice *xendev)
+{
+ return -1;
+}
+
+static int xen_9pfs_connect(struct XenDevice *xendev)
+{
+ return 0;
+}
+
+static void xen_9pfs_alloc(struct XenDevice *xendev)
+{
+}
+
+static void xen_9pfs_disconnect(struct XenDevice *xendev)
+{
+}
+
+struct XenDevOps xen_9pfs_ops = {
+ .size = sizeof(Xen9pfsDev),
+ .flags = DEVOPS_FLAG_NEED_GNTDEV,
+ .alloc = xen_9pfs_alloc,
+ .init = xen_9pfs_init,
+ .initialise = xen_9pfs_connect,
+ .disconnect = xen_9pfs_disconnect,
+ .free = xen_9pfs_free,
+};
--
1.9.1
^ permalink raw reply related [flat|nested] 40+ messages in thread
* [PATCH v3 4/9] xen/9pfs: introduce Xen 9pfs backend
@ 2017-03-16 20:01 ` Stefano Stabellini
0 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:01 UTC (permalink / raw)
To: qemu-devel
Cc: jgross, sstabellini, groug, Stefano Stabellini, Aneesh Kumar K.V,
anthony.perard, xen-devel
Introduce the Xen 9pfs backend: add struct XenDevOps to register as a
Xen backend and add struct V9fsTransport to register as v9fs transport.
All functions are empty stubs for now.
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
---
hw/9pfs/xen-9p-backend.c | 102 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 102 insertions(+)
create mode 100644 hw/9pfs/xen-9p-backend.c
diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
new file mode 100644
index 0000000..92bb805
--- /dev/null
+++ b/hw/9pfs/xen-9p-backend.c
@@ -0,0 +1,102 @@
+/*
+ * Xen 9p backend
+ *
+ * Copyright Aporeto 2017
+ *
+ * Authors:
+ * Stefano Stabellini <stefano@aporeto.com>
+ *
+ */
+
+#include "qemu/osdep.h"
+
+#include "hw/hw.h"
+#include "hw/9pfs/9p.h"
+#include "hw/xen/xen_backend.h"
+#include "hw/xen/io/ring.h"
+#include "qemu/config-file.h"
+#include "fsdev/qemu-fsdev.h"
+#include <xen/io/protocols.h>
+
+#define PAGE_SHIFT XC_PAGE_SHIFT
+#define XEN_9PFS_RING_ORDER 6
+#define XEN_9PFS_RING_SIZE XEN_FLEX_RING_SIZE(XEN_9PFS_RING_ORDER)
+DEFINE_XEN_FLEX_RING_AND_INTF(xen_9pfs);
+
+typedef struct Xen9pfsDev {
+ struct XenDevice xendev; /* must be first */
+} Xen9pfsDev;
+
+static ssize_t xen_9pfs_pdu_vmarshal(V9fsPDU *pdu,
+ size_t offset,
+ const char *fmt,
+ va_list ap)
+{
+ return 0;
+}
+
+static ssize_t xen_9pfs_pdu_vunmarshal(V9fsPDU *pdu,
+ size_t offset,
+ const char *fmt,
+ va_list ap)
+{
+ return 0;
+}
+
+static void xen_9pfs_init_out_iov_from_pdu(V9fsPDU *pdu,
+ struct iovec **piov,
+ unsigned int *pniov)
+{
+}
+
+static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu,
+ struct iovec **piov,
+ unsigned int *pniov,
+ size_t size)
+{
+}
+
+static void xen_9pfs_push_and_notify(V9fsPDU *pdu)
+{
+}
+
+static const struct V9fsTransport xen_9p_transport = {
+ .pdu_vmarshal = xen_9pfs_pdu_vmarshal,
+ .pdu_vunmarshal = xen_9pfs_pdu_vunmarshal,
+ .init_in_iov_from_pdu = xen_9pfs_init_in_iov_from_pdu,
+ .init_out_iov_from_pdu = xen_9pfs_init_out_iov_from_pdu,
+ .push_and_notify = xen_9pfs_push_and_notify,
+};
+
+static int xen_9pfs_init(struct XenDevice *xendev)
+{
+ return 0;
+}
+
+static int xen_9pfs_free(struct XenDevice *xendev)
+{
+ return -1;
+}
+
+static int xen_9pfs_connect(struct XenDevice *xendev)
+{
+ return 0;
+}
+
+static void xen_9pfs_alloc(struct XenDevice *xendev)
+{
+}
+
+static void xen_9pfs_disconnect(struct XenDevice *xendev)
+{
+}
+
+struct XenDevOps xen_9pfs_ops = {
+ .size = sizeof(Xen9pfsDev),
+ .flags = DEVOPS_FLAG_NEED_GNTDEV,
+ .alloc = xen_9pfs_alloc,
+ .init = xen_9pfs_init,
+ .initialise = xen_9pfs_connect,
+ .disconnect = xen_9pfs_disconnect,
+ .free = xen_9pfs_free,
+};
--
1.9.1
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 40+ messages in thread
* [Qemu-devel] [PATCH v3 5/9] xen/9pfs: connect to the frontend
2017-03-16 20:01 ` Stefano Stabellini
@ 2017-03-16 20:01 ` Stefano Stabellini
-1 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:01 UTC (permalink / raw)
To: qemu-devel
Cc: xen-devel, sstabellini, jgross, groug, Stefano Stabellini,
anthony.perard, Aneesh Kumar K.V
Write the limits of the backend to xenstore. Connect to the frontend.
Upon connection, allocate the rings according to the protocol
specification.
Initialize a QEMUBH to schedule work upon receiving an event channel
notification from the frontend.
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
---
hw/9pfs/xen-9p-backend.c | 182 ++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 181 insertions(+), 1 deletion(-)
diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
index 92bb805..3fd20ff 100644
--- a/hw/9pfs/xen-9p-backend.c
+++ b/hw/9pfs/xen-9p-backend.c
@@ -23,8 +23,39 @@
#define XEN_9PFS_RING_SIZE XEN_FLEX_RING_SIZE(XEN_9PFS_RING_ORDER)
DEFINE_XEN_FLEX_RING_AND_INTF(xen_9pfs);
+#define VERSIONS "1"
+#define MAX_RINGS 8
+#define MAX_RING_ORDER 8
+
+typedef struct Xen9pfsRing {
+ struct Xen9pfsDev *priv;
+
+ int ref;
+ xenevtchn_handle *evtchndev;
+ int evtchn;
+ int local_port;
+ struct xen_9pfs_data_intf *intf;
+ unsigned char *data;
+ struct xen_9pfs_data ring;
+
+ QEMUBH *bh;
+
+ /* local copies, so that we can read/write PDU data directly from
+ * the ring */
+ RING_IDX out_cons, out_size, in_cons;
+ bool inprogress;
+} Xen9pfsRing;
+
typedef struct Xen9pfsDev {
struct XenDevice xendev; /* must be first */
+ V9fsState state;
+ char *path;
+ char *security_model;
+ char *tag;
+ char *id;
+
+ int num_rings;
+ Xen9pfsRing *rings;
} Xen9pfsDev;
static ssize_t xen_9pfs_pdu_vmarshal(V9fsPDU *pdu,
@@ -73,22 +104,171 @@ static int xen_9pfs_init(struct XenDevice *xendev)
return 0;
}
+static void xen_9pfs_bh(void *opaque)
+{
+}
+
+static void xen_9pfs_evtchn_event(void *opaque)
+{
+}
+
static int xen_9pfs_free(struct XenDevice *xendev)
{
- return -1;
+ int i;
+ Xen9pfsDev *xen_9pdev = container_of(xendev, Xen9pfsDev, xendev);
+
+ if (xen_9pdev->id != NULL) {
+ g_free(xen_9pdev->id);
+ }
+ if (xen_9pdev->tag != NULL) {
+ g_free(xen_9pdev->tag);
+ }
+ if (xen_9pdev->path != NULL) {
+ g_free(xen_9pdev->path);
+ }
+ if (xen_9pdev->security_model != NULL) {
+ g_free(xen_9pdev->security_model);
+ }
+
+ for (i = 0; i < xen_9pdev->num_rings; i++) {
+ if (xen_9pdev->rings[i].data != NULL) {
+ xengnttab_unmap(xen_9pdev->xendev.gnttabdev,
+ xen_9pdev->rings[i].data,
+ (1 << XEN_9PFS_RING_ORDER));
+ }
+ if (xen_9pdev->rings[i].intf != NULL) {
+ xengnttab_unmap(xen_9pdev->xendev.gnttabdev,
+ xen_9pdev->rings[i].intf,
+ 1);
+ }
+ if (xen_9pdev->rings[i].evtchndev > 0) {
+ qemu_set_fd_handler(xenevtchn_fd(xen_9pdev->rings[i].evtchndev),
+ NULL, NULL, NULL);
+ xenevtchn_unbind(xen_9pdev->rings[i].evtchndev,
+ xen_9pdev->rings[i].local_port);
+ }
+ if (xen_9pdev->rings[i].bh != NULL) {
+ qemu_bh_delete(xen_9pdev->rings[i].bh);
+ }
+ }
+ g_free(xen_9pdev->rings);
+ return 0;
}
static int xen_9pfs_connect(struct XenDevice *xendev)
{
+ int i;
+ Xen9pfsDev *xen_9pdev = container_of(xendev, Xen9pfsDev, xendev);
+ V9fsState *s = &xen_9pdev->state;
+ QemuOpts *fsdev;
+
+ if (xenstore_read_fe_int(&xen_9pdev->xendev, "num-rings",
+ &xen_9pdev->num_rings) == -1 ||
+ xen_9pdev->num_rings > MAX_RINGS || xen_9pdev->num_rings < 1) {
+ return -1;
+ }
+
+ xen_9pdev->rings = g_malloc0(xen_9pdev->num_rings * sizeof(Xen9pfsRing));
+ for (i = 0; i < xen_9pdev->num_rings; i++) {
+ char *str;
+
+ xen_9pdev->rings[i].priv = xen_9pdev;
+ xen_9pdev->rings[i].evtchn = -1;
+ xen_9pdev->rings[i].local_port = -1;
+
+ str = g_strdup_printf("ring-ref%u", i);
+ if (xenstore_read_fe_int(&xen_9pdev->xendev, str,
+ &xen_9pdev->rings[i].ref) == -1) {
+ goto out;
+ }
+ g_free(str);
+ str = g_strdup_printf("event-channel-%u", i);
+ if (xenstore_read_fe_int(&xen_9pdev->xendev, str,
+ &xen_9pdev->rings[i].evtchn) == -1) {
+ goto out;
+ }
+ g_free(str);
+
+ xen_9pdev->rings[i].intf = xengnttab_map_grant_ref(
+ xen_9pdev->xendev.gnttabdev,
+ xen_9pdev->xendev.dom,
+ xen_9pdev->rings[i].ref,
+ PROT_READ | PROT_WRITE);
+ if (!xen_9pdev->rings[i].intf) {
+ goto out;
+ }
+ xen_9pdev->rings[i].data = xengnttab_map_domain_grant_refs(
+ xen_9pdev->xendev.gnttabdev,
+ (1 << XEN_9PFS_RING_ORDER),
+ xen_9pdev->xendev.dom,
+ xen_9pdev->rings[i].intf->ref,
+ PROT_READ | PROT_WRITE);
+ if (!xen_9pdev->rings[i].data) {
+ goto out;
+ }
+ xen_9pdev->rings[i].ring.in = xen_9pdev->rings[i].data;
+ xen_9pdev->rings[i].ring.out = xen_9pdev->rings[i].data +
+ XEN_9PFS_RING_SIZE;
+
+ xen_9pdev->rings[i].bh = qemu_bh_new(xen_9pfs_bh, &xen_9pdev->rings[i]);
+ xen_9pdev->rings[i].out_cons = 0;
+ xen_9pdev->rings[i].out_size = 0;
+ xen_9pdev->rings[i].inprogress = false;
+
+
+ xen_9pdev->rings[i].evtchndev = xenevtchn_open(NULL, 0);
+ if (xen_9pdev->rings[i].evtchndev == NULL) {
+ goto out;
+ }
+ fcntl(xenevtchn_fd(xen_9pdev->rings[i].evtchndev), F_SETFD, FD_CLOEXEC);
+ xen_9pdev->rings[i].local_port = xenevtchn_bind_interdomain
+ (xen_9pdev->rings[i].evtchndev,
+ xendev->dom,
+ xen_9pdev->rings[i].evtchn);
+ if (xen_9pdev->rings[i].local_port == -1) {
+ xen_pv_printf(xendev, 0,
+ "xenevtchn_bind_interdomain failed port=%d\n",
+ xen_9pdev->rings[i].evtchn);
+ goto out;
+ }
+ xen_pv_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port);
+ qemu_set_fd_handler(xenevtchn_fd(xen_9pdev->rings[i].evtchndev),
+ xen_9pfs_evtchn_event, NULL, &xen_9pdev->rings[i]);
+ }
+
+ xen_9pdev->security_model = xenstore_read_be_str(xendev, "security_model");
+ xen_9pdev->path = xenstore_read_be_str(xendev, "path");
+ xen_9pdev->id = s->fsconf.fsdev_id =
+ g_strdup_printf("xen9p%d", xendev->dev);
+ xen_9pdev->tag = s->fsconf.tag = xenstore_read_fe_str(xendev, "tag");
+ v9fs_register_transport(s, &xen_9p_transport);
+ fsdev = qemu_opts_create(qemu_find_opts("fsdev"),
+ s->fsconf.tag,
+ 1, NULL);
+ qemu_opt_set(fsdev, "fsdriver", "local", NULL);
+ qemu_opt_set(fsdev, "path", xen_9pdev->path, NULL);
+ qemu_opt_set(fsdev, "security_model", xen_9pdev->security_model, NULL);
+ qemu_opts_set_id(fsdev, s->fsconf.fsdev_id);
+ qemu_fsdev_add(fsdev);
+ v9fs_device_realize_common(s, NULL);
+
return 0;
+
+out:
+ xen_9pfs_free(xendev);
+ return -1;
}
static void xen_9pfs_alloc(struct XenDevice *xendev)
{
+ xenstore_write_be_str(xendev, "versions", VERSIONS);
+ xenstore_write_be_int(xendev, "max-rings", MAX_RINGS);
+ xenstore_write_be_int(xendev, "max-ring-page-order", MAX_RING_ORDER);
}
static void xen_9pfs_disconnect(struct XenDevice *xendev)
{
+ /* Dynamic hotplug of PV filesystems at runtime is not supported. */
}
struct XenDevOps xen_9pfs_ops = {
--
1.9.1
^ permalink raw reply related [flat|nested] 40+ messages in thread
* [PATCH v3 5/9] xen/9pfs: connect to the frontend
@ 2017-03-16 20:01 ` Stefano Stabellini
0 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:01 UTC (permalink / raw)
To: qemu-devel
Cc: jgross, sstabellini, groug, Stefano Stabellini, Aneesh Kumar K.V,
anthony.perard, xen-devel
Write the limits of the backend to xenstore. Connect to the frontend.
Upon connection, allocate the rings according to the protocol
specification.
Initialize a QEMUBH to schedule work upon receiving an event channel
notification from the frontend.
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
---
hw/9pfs/xen-9p-backend.c | 182 ++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 181 insertions(+), 1 deletion(-)
diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
index 92bb805..3fd20ff 100644
--- a/hw/9pfs/xen-9p-backend.c
+++ b/hw/9pfs/xen-9p-backend.c
@@ -23,8 +23,39 @@
#define XEN_9PFS_RING_SIZE XEN_FLEX_RING_SIZE(XEN_9PFS_RING_ORDER)
DEFINE_XEN_FLEX_RING_AND_INTF(xen_9pfs);
+#define VERSIONS "1"
+#define MAX_RINGS 8
+#define MAX_RING_ORDER 8
+
+typedef struct Xen9pfsRing {
+ struct Xen9pfsDev *priv;
+
+ int ref;
+ xenevtchn_handle *evtchndev;
+ int evtchn;
+ int local_port;
+ struct xen_9pfs_data_intf *intf;
+ unsigned char *data;
+ struct xen_9pfs_data ring;
+
+ QEMUBH *bh;
+
+ /* local copies, so that we can read/write PDU data directly from
+ * the ring */
+ RING_IDX out_cons, out_size, in_cons;
+ bool inprogress;
+} Xen9pfsRing;
+
typedef struct Xen9pfsDev {
struct XenDevice xendev; /* must be first */
+ V9fsState state;
+ char *path;
+ char *security_model;
+ char *tag;
+ char *id;
+
+ int num_rings;
+ Xen9pfsRing *rings;
} Xen9pfsDev;
static ssize_t xen_9pfs_pdu_vmarshal(V9fsPDU *pdu,
@@ -73,22 +104,171 @@ static int xen_9pfs_init(struct XenDevice *xendev)
return 0;
}
+static void xen_9pfs_bh(void *opaque)
+{
+}
+
+static void xen_9pfs_evtchn_event(void *opaque)
+{
+}
+
static int xen_9pfs_free(struct XenDevice *xendev)
{
- return -1;
+ int i;
+ Xen9pfsDev *xen_9pdev = container_of(xendev, Xen9pfsDev, xendev);
+
+ if (xen_9pdev->id != NULL) {
+ g_free(xen_9pdev->id);
+ }
+ if (xen_9pdev->tag != NULL) {
+ g_free(xen_9pdev->tag);
+ }
+ if (xen_9pdev->path != NULL) {
+ g_free(xen_9pdev->path);
+ }
+ if (xen_9pdev->security_model != NULL) {
+ g_free(xen_9pdev->security_model);
+ }
+
+ for (i = 0; i < xen_9pdev->num_rings; i++) {
+ if (xen_9pdev->rings[i].data != NULL) {
+ xengnttab_unmap(xen_9pdev->xendev.gnttabdev,
+ xen_9pdev->rings[i].data,
+ (1 << XEN_9PFS_RING_ORDER));
+ }
+ if (xen_9pdev->rings[i].intf != NULL) {
+ xengnttab_unmap(xen_9pdev->xendev.gnttabdev,
+ xen_9pdev->rings[i].intf,
+ 1);
+ }
+ if (xen_9pdev->rings[i].evtchndev > 0) {
+ qemu_set_fd_handler(xenevtchn_fd(xen_9pdev->rings[i].evtchndev),
+ NULL, NULL, NULL);
+ xenevtchn_unbind(xen_9pdev->rings[i].evtchndev,
+ xen_9pdev->rings[i].local_port);
+ }
+ if (xen_9pdev->rings[i].bh != NULL) {
+ qemu_bh_delete(xen_9pdev->rings[i].bh);
+ }
+ }
+ g_free(xen_9pdev->rings);
+ return 0;
}
static int xen_9pfs_connect(struct XenDevice *xendev)
{
+ int i;
+ Xen9pfsDev *xen_9pdev = container_of(xendev, Xen9pfsDev, xendev);
+ V9fsState *s = &xen_9pdev->state;
+ QemuOpts *fsdev;
+
+ if (xenstore_read_fe_int(&xen_9pdev->xendev, "num-rings",
+ &xen_9pdev->num_rings) == -1 ||
+ xen_9pdev->num_rings > MAX_RINGS || xen_9pdev->num_rings < 1) {
+ return -1;
+ }
+
+ xen_9pdev->rings = g_malloc0(xen_9pdev->num_rings * sizeof(Xen9pfsRing));
+ for (i = 0; i < xen_9pdev->num_rings; i++) {
+ char *str;
+
+ xen_9pdev->rings[i].priv = xen_9pdev;
+ xen_9pdev->rings[i].evtchn = -1;
+ xen_9pdev->rings[i].local_port = -1;
+
+ str = g_strdup_printf("ring-ref%u", i);
+ if (xenstore_read_fe_int(&xen_9pdev->xendev, str,
+ &xen_9pdev->rings[i].ref) == -1) {
+ goto out;
+ }
+ g_free(str);
+ str = g_strdup_printf("event-channel-%u", i);
+ if (xenstore_read_fe_int(&xen_9pdev->xendev, str,
+ &xen_9pdev->rings[i].evtchn) == -1) {
+ goto out;
+ }
+ g_free(str);
+
+ xen_9pdev->rings[i].intf = xengnttab_map_grant_ref(
+ xen_9pdev->xendev.gnttabdev,
+ xen_9pdev->xendev.dom,
+ xen_9pdev->rings[i].ref,
+ PROT_READ | PROT_WRITE);
+ if (!xen_9pdev->rings[i].intf) {
+ goto out;
+ }
+ xen_9pdev->rings[i].data = xengnttab_map_domain_grant_refs(
+ xen_9pdev->xendev.gnttabdev,
+ (1 << XEN_9PFS_RING_ORDER),
+ xen_9pdev->xendev.dom,
+ xen_9pdev->rings[i].intf->ref,
+ PROT_READ | PROT_WRITE);
+ if (!xen_9pdev->rings[i].data) {
+ goto out;
+ }
+ xen_9pdev->rings[i].ring.in = xen_9pdev->rings[i].data;
+ xen_9pdev->rings[i].ring.out = xen_9pdev->rings[i].data +
+ XEN_9PFS_RING_SIZE;
+
+ xen_9pdev->rings[i].bh = qemu_bh_new(xen_9pfs_bh, &xen_9pdev->rings[i]);
+ xen_9pdev->rings[i].out_cons = 0;
+ xen_9pdev->rings[i].out_size = 0;
+ xen_9pdev->rings[i].inprogress = false;
+
+
+ xen_9pdev->rings[i].evtchndev = xenevtchn_open(NULL, 0);
+ if (xen_9pdev->rings[i].evtchndev == NULL) {
+ goto out;
+ }
+ fcntl(xenevtchn_fd(xen_9pdev->rings[i].evtchndev), F_SETFD, FD_CLOEXEC);
+ xen_9pdev->rings[i].local_port = xenevtchn_bind_interdomain
+ (xen_9pdev->rings[i].evtchndev,
+ xendev->dom,
+ xen_9pdev->rings[i].evtchn);
+ if (xen_9pdev->rings[i].local_port == -1) {
+ xen_pv_printf(xendev, 0,
+ "xenevtchn_bind_interdomain failed port=%d\n",
+ xen_9pdev->rings[i].evtchn);
+ goto out;
+ }
+ xen_pv_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port);
+ qemu_set_fd_handler(xenevtchn_fd(xen_9pdev->rings[i].evtchndev),
+ xen_9pfs_evtchn_event, NULL, &xen_9pdev->rings[i]);
+ }
+
+ xen_9pdev->security_model = xenstore_read_be_str(xendev, "security_model");
+ xen_9pdev->path = xenstore_read_be_str(xendev, "path");
+ xen_9pdev->id = s->fsconf.fsdev_id =
+ g_strdup_printf("xen9p%d", xendev->dev);
+ xen_9pdev->tag = s->fsconf.tag = xenstore_read_fe_str(xendev, "tag");
+ v9fs_register_transport(s, &xen_9p_transport);
+ fsdev = qemu_opts_create(qemu_find_opts("fsdev"),
+ s->fsconf.tag,
+ 1, NULL);
+ qemu_opt_set(fsdev, "fsdriver", "local", NULL);
+ qemu_opt_set(fsdev, "path", xen_9pdev->path, NULL);
+ qemu_opt_set(fsdev, "security_model", xen_9pdev->security_model, NULL);
+ qemu_opts_set_id(fsdev, s->fsconf.fsdev_id);
+ qemu_fsdev_add(fsdev);
+ v9fs_device_realize_common(s, NULL);
+
return 0;
+
+out:
+ xen_9pfs_free(xendev);
+ return -1;
}
static void xen_9pfs_alloc(struct XenDevice *xendev)
{
+ xenstore_write_be_str(xendev, "versions", VERSIONS);
+ xenstore_write_be_int(xendev, "max-rings", MAX_RINGS);
+ xenstore_write_be_int(xendev, "max-ring-page-order", MAX_RING_ORDER);
}
static void xen_9pfs_disconnect(struct XenDevice *xendev)
{
+ /* Dynamic hotplug of PV filesystems at runtime is not supported. */
}
struct XenDevOps xen_9pfs_ops = {
--
1.9.1
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 40+ messages in thread
* [Qemu-devel] [PATCH v3 6/9] xen/9pfs: receive requests from the frontend
2017-03-16 20:01 ` Stefano Stabellini
@ 2017-03-16 20:01 ` Stefano Stabellini
-1 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:01 UTC (permalink / raw)
To: qemu-devel
Cc: xen-devel, sstabellini, jgross, groug, Stefano Stabellini,
anthony.perard, Aneesh Kumar K.V
Upon receiving an event channel notification from the frontend, schedule
the bottom half. From the bottom half, read one request from the ring,
create a pdu and call pdu_submit to handle it.
For now, only handle one request per ring at a time.
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
---
hw/9pfs/xen-9p-backend.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
index 3fd20ff..f757591 100644
--- a/hw/9pfs/xen-9p-backend.c
+++ b/hw/9pfs/xen-9p-backend.c
@@ -104,12 +104,60 @@ static int xen_9pfs_init(struct XenDevice *xendev)
return 0;
}
+static int xen_9pfs_receive(Xen9pfsRing *ring)
+{
+ P9MsgHeader h;
+ RING_IDX cons, prod, masked_prod, masked_cons;
+ V9fsPDU *pdu;
+
+ if (ring->inprogress) {
+ return 0;
+ }
+
+ cons = ring->intf->out_cons;
+ prod = ring->intf->out_prod;
+ xen_rmb();
+
+ if (xen_9pfs_queued(prod, cons, XEN_9PFS_RING_SIZE) < sizeof(h)) {
+ return 0;
+ }
+ ring->inprogress = true;
+
+ masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE);
+ masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
+
+ xen_9pfs_read_packet(ring->ring.out, masked_prod, &masked_cons,
+ XEN_9PFS_RING_SIZE, (uint8_t *) &h, sizeof(h));
+
+ /* cannot fail, because we only handle one request per ring at a time */
+ pdu = pdu_alloc(&ring->priv->state);
+ pdu->size = le32_to_cpu(h.size_le);
+ pdu->id = h.id;
+ pdu->tag = le32_to_cpu(h.tag_le);
+ ring->out_size = le32_to_cpu(h.size_le);
+ ring->out_cons = cons + le32_to_cpu(h.size_le);
+
+ qemu_co_queue_init(&pdu->complete);
+ pdu_submit(pdu);
+
+ return 0;
+}
+
static void xen_9pfs_bh(void *opaque)
{
+ Xen9pfsRing *ring = opaque;
+ xen_9pfs_receive(ring);
}
static void xen_9pfs_evtchn_event(void *opaque)
{
+ Xen9pfsRing *ring = opaque;
+ evtchn_port_t port;
+
+ port = xenevtchn_pending(ring->evtchndev);
+ xenevtchn_unmask(ring->evtchndev, port);
+
+ qemu_bh_schedule(ring->bh);
}
static int xen_9pfs_free(struct XenDevice *xendev)
--
1.9.1
^ permalink raw reply related [flat|nested] 40+ messages in thread
* [PATCH v3 6/9] xen/9pfs: receive requests from the frontend
@ 2017-03-16 20:01 ` Stefano Stabellini
0 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:01 UTC (permalink / raw)
To: qemu-devel
Cc: jgross, sstabellini, groug, Stefano Stabellini, Aneesh Kumar K.V,
anthony.perard, xen-devel
Upon receiving an event channel notification from the frontend, schedule
the bottom half. From the bottom half, read one request from the ring,
create a pdu and call pdu_submit to handle it.
For now, only handle one request per ring at a time.
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
---
hw/9pfs/xen-9p-backend.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
index 3fd20ff..f757591 100644
--- a/hw/9pfs/xen-9p-backend.c
+++ b/hw/9pfs/xen-9p-backend.c
@@ -104,12 +104,60 @@ static int xen_9pfs_init(struct XenDevice *xendev)
return 0;
}
+static int xen_9pfs_receive(Xen9pfsRing *ring)
+{
+ P9MsgHeader h;
+ RING_IDX cons, prod, masked_prod, masked_cons;
+ V9fsPDU *pdu;
+
+ if (ring->inprogress) {
+ return 0;
+ }
+
+ cons = ring->intf->out_cons;
+ prod = ring->intf->out_prod;
+ xen_rmb();
+
+ if (xen_9pfs_queued(prod, cons, XEN_9PFS_RING_SIZE) < sizeof(h)) {
+ return 0;
+ }
+ ring->inprogress = true;
+
+ masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE);
+ masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
+
+ xen_9pfs_read_packet(ring->ring.out, masked_prod, &masked_cons,
+ XEN_9PFS_RING_SIZE, (uint8_t *) &h, sizeof(h));
+
+ /* cannot fail, because we only handle one request per ring at a time */
+ pdu = pdu_alloc(&ring->priv->state);
+ pdu->size = le32_to_cpu(h.size_le);
+ pdu->id = h.id;
+ pdu->tag = le32_to_cpu(h.tag_le);
+ ring->out_size = le32_to_cpu(h.size_le);
+ ring->out_cons = cons + le32_to_cpu(h.size_le);
+
+ qemu_co_queue_init(&pdu->complete);
+ pdu_submit(pdu);
+
+ return 0;
+}
+
static void xen_9pfs_bh(void *opaque)
{
+ Xen9pfsRing *ring = opaque;
+ xen_9pfs_receive(ring);
}
static void xen_9pfs_evtchn_event(void *opaque)
{
+ Xen9pfsRing *ring = opaque;
+ evtchn_port_t port;
+
+ port = xenevtchn_pending(ring->evtchndev);
+ xenevtchn_unmask(ring->evtchndev, port);
+
+ qemu_bh_schedule(ring->bh);
}
static int xen_9pfs_free(struct XenDevice *xendev)
--
1.9.1
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 40+ messages in thread
* [Qemu-devel] [PATCH v3 7/9] xen/9pfs: implement in/out_iov_from_pdu and vmarshal/vunmarshal
2017-03-16 20:01 ` Stefano Stabellini
@ 2017-03-16 20:01 ` Stefano Stabellini
-1 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:01 UTC (permalink / raw)
To: qemu-devel
Cc: xen-devel, sstabellini, jgross, groug, Stefano Stabellini,
anthony.perard, Aneesh Kumar K.V
Implement xen_9pfs_init_in/out_iov_from_pdu and
xen_9pfs_pdu_vmarshal/vunmarshall by creating new sg pointing to the
data on the ring.
This is safe as we only handle one request per ring at any given time.
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
---
hw/9pfs/xen-9p-backend.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 90 insertions(+), 2 deletions(-)
diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
index f757591..0a1eb34 100644
--- a/hw/9pfs/xen-9p-backend.c
+++ b/hw/9pfs/xen-9p-backend.c
@@ -58,12 +58,78 @@ typedef struct Xen9pfsDev {
Xen9pfsRing *rings;
} Xen9pfsDev;
+static void xen_9pfs_in_sg(Xen9pfsRing *ring,
+ struct iovec *in_sg,
+ int *num,
+ uint32_t idx,
+ uint32_t size)
+{
+ RING_IDX cons, prod, masked_prod, masked_cons;
+
+ cons = ring->intf->in_cons;
+ prod = ring->intf->in_prod;
+ xen_rmb();
+ masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE);
+ masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
+
+ if (masked_prod < masked_cons) {
+ in_sg[0].iov_base = ring->ring.in + masked_prod;
+ in_sg[0].iov_len = masked_cons - masked_prod;
+ *num = 1;
+ } else {
+ in_sg[0].iov_base = ring->ring.in + masked_prod;
+ in_sg[0].iov_len = XEN_9PFS_RING_SIZE - masked_prod;
+ in_sg[1].iov_base = ring->ring.in;
+ in_sg[1].iov_len = masked_cons;
+ *num = 2;
+ }
+}
+
+static void xen_9pfs_out_sg(Xen9pfsRing *ring,
+ struct iovec *out_sg,
+ int *num,
+ uint32_t idx)
+{
+ RING_IDX cons, prod, masked_prod, masked_cons;
+
+ cons = ring->intf->out_cons;
+ prod = ring->intf->out_prod;
+ xen_rmb();
+ masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE);
+ masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
+
+ if (masked_cons < masked_prod) {
+ out_sg[0].iov_base = ring->ring.out + masked_cons;
+ out_sg[0].iov_len = ring->out_size;
+ *num = 1;
+ } else {
+ if (ring->out_size > (XEN_9PFS_RING_SIZE - masked_cons)) {
+ out_sg[0].iov_base = ring->ring.out + masked_cons;
+ out_sg[0].iov_len = XEN_9PFS_RING_SIZE - masked_cons;
+ out_sg[1].iov_base = ring->ring.out;
+ out_sg[1].iov_len = ring->out_size -
+ (XEN_9PFS_RING_SIZE - masked_cons);
+ *num = 2;
+ } else {
+ out_sg[0].iov_base = ring->ring.out + masked_cons;
+ out_sg[0].iov_len = ring->out_size;
+ *num = 1;
+ }
+ }
+}
+
static ssize_t xen_9pfs_pdu_vmarshal(V9fsPDU *pdu,
size_t offset,
const char *fmt,
va_list ap)
{
- return 0;
+ Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
+ struct iovec in_sg[2];
+ int num;
+
+ xen_9pfs_in_sg(&xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings],
+ in_sg, &num, pdu->idx, ROUND_UP(offset + 128, 512));
+ return v9fs_iov_vmarshal(in_sg, num, offset, 0, fmt, ap);
}
static ssize_t xen_9pfs_pdu_vunmarshal(V9fsPDU *pdu,
@@ -71,13 +137,27 @@ static ssize_t xen_9pfs_pdu_vunmarshal(V9fsPDU *pdu,
const char *fmt,
va_list ap)
{
- return 0;
+ Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
+ struct iovec out_sg[2];
+ int num;
+
+ xen_9pfs_out_sg(&xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings],
+ out_sg, &num, pdu->idx);
+ return v9fs_iov_vunmarshal(out_sg, num, offset, 0, fmt, ap);
}
static void xen_9pfs_init_out_iov_from_pdu(V9fsPDU *pdu,
struct iovec **piov,
unsigned int *pniov)
{
+ Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
+ Xen9pfsRing *ring = &xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings];
+ struct iovec *sg = g_malloc0(sizeof(*sg) * 2);
+ int num;
+
+ xen_9pfs_out_sg(ring, sg, &num, pdu->idx);
+ *piov = sg;
+ *pniov = num;
}
static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu,
@@ -85,6 +165,14 @@ static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu,
unsigned int *pniov,
size_t size)
{
+ Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
+ Xen9pfsRing *ring = &xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings];
+ struct iovec *sg = g_malloc0(sizeof(*sg) * 2);
+ int num;
+
+ xen_9pfs_in_sg(ring, sg, &num, pdu->idx, size);
+ *piov = sg;
+ *pniov = num;
}
static void xen_9pfs_push_and_notify(V9fsPDU *pdu)
--
1.9.1
^ permalink raw reply related [flat|nested] 40+ messages in thread
* [PATCH v3 7/9] xen/9pfs: implement in/out_iov_from_pdu and vmarshal/vunmarshal
@ 2017-03-16 20:01 ` Stefano Stabellini
0 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:01 UTC (permalink / raw)
To: qemu-devel
Cc: jgross, sstabellini, groug, Stefano Stabellini, Aneesh Kumar K.V,
anthony.perard, xen-devel
Implement xen_9pfs_init_in/out_iov_from_pdu and
xen_9pfs_pdu_vmarshal/vunmarshall by creating new sg pointing to the
data on the ring.
This is safe as we only handle one request per ring at any given time.
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
---
hw/9pfs/xen-9p-backend.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 90 insertions(+), 2 deletions(-)
diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
index f757591..0a1eb34 100644
--- a/hw/9pfs/xen-9p-backend.c
+++ b/hw/9pfs/xen-9p-backend.c
@@ -58,12 +58,78 @@ typedef struct Xen9pfsDev {
Xen9pfsRing *rings;
} Xen9pfsDev;
+static void xen_9pfs_in_sg(Xen9pfsRing *ring,
+ struct iovec *in_sg,
+ int *num,
+ uint32_t idx,
+ uint32_t size)
+{
+ RING_IDX cons, prod, masked_prod, masked_cons;
+
+ cons = ring->intf->in_cons;
+ prod = ring->intf->in_prod;
+ xen_rmb();
+ masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE);
+ masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
+
+ if (masked_prod < masked_cons) {
+ in_sg[0].iov_base = ring->ring.in + masked_prod;
+ in_sg[0].iov_len = masked_cons - masked_prod;
+ *num = 1;
+ } else {
+ in_sg[0].iov_base = ring->ring.in + masked_prod;
+ in_sg[0].iov_len = XEN_9PFS_RING_SIZE - masked_prod;
+ in_sg[1].iov_base = ring->ring.in;
+ in_sg[1].iov_len = masked_cons;
+ *num = 2;
+ }
+}
+
+static void xen_9pfs_out_sg(Xen9pfsRing *ring,
+ struct iovec *out_sg,
+ int *num,
+ uint32_t idx)
+{
+ RING_IDX cons, prod, masked_prod, masked_cons;
+
+ cons = ring->intf->out_cons;
+ prod = ring->intf->out_prod;
+ xen_rmb();
+ masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE);
+ masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
+
+ if (masked_cons < masked_prod) {
+ out_sg[0].iov_base = ring->ring.out + masked_cons;
+ out_sg[0].iov_len = ring->out_size;
+ *num = 1;
+ } else {
+ if (ring->out_size > (XEN_9PFS_RING_SIZE - masked_cons)) {
+ out_sg[0].iov_base = ring->ring.out + masked_cons;
+ out_sg[0].iov_len = XEN_9PFS_RING_SIZE - masked_cons;
+ out_sg[1].iov_base = ring->ring.out;
+ out_sg[1].iov_len = ring->out_size -
+ (XEN_9PFS_RING_SIZE - masked_cons);
+ *num = 2;
+ } else {
+ out_sg[0].iov_base = ring->ring.out + masked_cons;
+ out_sg[0].iov_len = ring->out_size;
+ *num = 1;
+ }
+ }
+}
+
static ssize_t xen_9pfs_pdu_vmarshal(V9fsPDU *pdu,
size_t offset,
const char *fmt,
va_list ap)
{
- return 0;
+ Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
+ struct iovec in_sg[2];
+ int num;
+
+ xen_9pfs_in_sg(&xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings],
+ in_sg, &num, pdu->idx, ROUND_UP(offset + 128, 512));
+ return v9fs_iov_vmarshal(in_sg, num, offset, 0, fmt, ap);
}
static ssize_t xen_9pfs_pdu_vunmarshal(V9fsPDU *pdu,
@@ -71,13 +137,27 @@ static ssize_t xen_9pfs_pdu_vunmarshal(V9fsPDU *pdu,
const char *fmt,
va_list ap)
{
- return 0;
+ Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
+ struct iovec out_sg[2];
+ int num;
+
+ xen_9pfs_out_sg(&xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings],
+ out_sg, &num, pdu->idx);
+ return v9fs_iov_vunmarshal(out_sg, num, offset, 0, fmt, ap);
}
static void xen_9pfs_init_out_iov_from_pdu(V9fsPDU *pdu,
struct iovec **piov,
unsigned int *pniov)
{
+ Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
+ Xen9pfsRing *ring = &xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings];
+ struct iovec *sg = g_malloc0(sizeof(*sg) * 2);
+ int num;
+
+ xen_9pfs_out_sg(ring, sg, &num, pdu->idx);
+ *piov = sg;
+ *pniov = num;
}
static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu,
@@ -85,6 +165,14 @@ static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu,
unsigned int *pniov,
size_t size)
{
+ Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
+ Xen9pfsRing *ring = &xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings];
+ struct iovec *sg = g_malloc0(sizeof(*sg) * 2);
+ int num;
+
+ xen_9pfs_in_sg(ring, sg, &num, pdu->idx, size);
+ *piov = sg;
+ *pniov = num;
}
static void xen_9pfs_push_and_notify(V9fsPDU *pdu)
--
1.9.1
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 40+ messages in thread
* [Qemu-devel] [PATCH v3 8/9] xen/9pfs: send responses back to the frontend
2017-03-16 20:01 ` Stefano Stabellini
@ 2017-03-16 20:01 ` Stefano Stabellini
-1 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:01 UTC (permalink / raw)
To: qemu-devel
Cc: xen-devel, sstabellini, jgross, groug, Stefano Stabellini,
anthony.perard, Aneesh Kumar K.V
Once a request is completed, xen_9pfs_push_and_notify gets called. In
xen_9pfs_push_and_notify, update the indexes (data has already been
copied to the sg by the common code) and send a notification to the
frontend.
Schedule the bottom-half to check if we already have any other requests
pending.
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
---
hw/9pfs/xen-9p-backend.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
index 0a1eb34..c7b748a 100644
--- a/hw/9pfs/xen-9p-backend.c
+++ b/hw/9pfs/xen-9p-backend.c
@@ -177,6 +177,22 @@ static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu,
static void xen_9pfs_push_and_notify(V9fsPDU *pdu)
{
+ RING_IDX prod;
+ Xen9pfsDev *priv = container_of(pdu->s, Xen9pfsDev, state);
+ Xen9pfsRing *ring = &priv->rings[pdu->tag % priv->num_rings];
+
+ ring->intf->out_cons = ring->out_cons;
+ xen_wmb();
+
+ prod = ring->intf->in_prod;
+ xen_rmb();
+ ring->intf->in_prod = prod + pdu->size;
+ xen_wmb();
+
+ ring->inprogress = false;
+ xenevtchn_notify(ring->evtchndev, ring->local_port);
+
+ qemu_bh_schedule(ring->bh);
}
static const struct V9fsTransport xen_9p_transport = {
--
1.9.1
^ permalink raw reply related [flat|nested] 40+ messages in thread
* [PATCH v3 8/9] xen/9pfs: send responses back to the frontend
@ 2017-03-16 20:01 ` Stefano Stabellini
0 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:01 UTC (permalink / raw)
To: qemu-devel
Cc: jgross, sstabellini, groug, Stefano Stabellini, Aneesh Kumar K.V,
anthony.perard, xen-devel
Once a request is completed, xen_9pfs_push_and_notify gets called. In
xen_9pfs_push_and_notify, update the indexes (data has already been
copied to the sg by the common code) and send a notification to the
frontend.
Schedule the bottom-half to check if we already have any other requests
pending.
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
---
hw/9pfs/xen-9p-backend.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
index 0a1eb34..c7b748a 100644
--- a/hw/9pfs/xen-9p-backend.c
+++ b/hw/9pfs/xen-9p-backend.c
@@ -177,6 +177,22 @@ static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu,
static void xen_9pfs_push_and_notify(V9fsPDU *pdu)
{
+ RING_IDX prod;
+ Xen9pfsDev *priv = container_of(pdu->s, Xen9pfsDev, state);
+ Xen9pfsRing *ring = &priv->rings[pdu->tag % priv->num_rings];
+
+ ring->intf->out_cons = ring->out_cons;
+ xen_wmb();
+
+ prod = ring->intf->in_prod;
+ xen_rmb();
+ ring->intf->in_prod = prod + pdu->size;
+ xen_wmb();
+
+ ring->inprogress = false;
+ xenevtchn_notify(ring->evtchndev, ring->local_port);
+
+ qemu_bh_schedule(ring->bh);
}
static const struct V9fsTransport xen_9p_transport = {
--
1.9.1
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 40+ messages in thread
* [Qemu-devel] [PATCH v3 9/9] xen/9pfs: build and register Xen 9pfs backend
2017-03-16 20:01 ` Stefano Stabellini
@ 2017-03-16 20:01 ` Stefano Stabellini
-1 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:01 UTC (permalink / raw)
To: qemu-devel
Cc: xen-devel, sstabellini, jgross, groug, Stefano Stabellini,
anthony.perard, Aneesh Kumar K.V
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
---
hw/9pfs/Makefile.objs | 1 +
hw/xen/xen_backend.c | 3 +++
include/hw/xen/xen_backend.h | 3 +++
3 files changed, 7 insertions(+)
diff --git a/hw/9pfs/Makefile.objs b/hw/9pfs/Makefile.objs
index da0ae0c..1a89850 100644
--- a/hw/9pfs/Makefile.objs
+++ b/hw/9pfs/Makefile.objs
@@ -5,5 +5,6 @@ common-obj-y += coth.o cofs.o codir.o cofile.o
common-obj-y += coxattr.o 9p-synth.o
common-obj-$(CONFIG_OPEN_BY_HANDLE) += 9p-handle.o
common-obj-y += 9p-proxy.o
+common-obj-$(CONFIG_XEN) += xen-9p-backend.o
obj-y += virtio-9p-device.o
diff --git a/hw/xen/xen_backend.c b/hw/xen/xen_backend.c
index 6c21c37..fe737e9 100644
--- a/hw/xen/xen_backend.c
+++ b/hw/xen/xen_backend.c
@@ -585,6 +585,9 @@ void xen_be_register_common(void)
xen_be_register("console", &xen_console_ops);
xen_be_register("vkbd", &xen_kbdmouse_ops);
xen_be_register("qdisk", &xen_blkdev_ops);
+#ifdef CONFIG_VIRTFS
+ xen_be_register("9pfs", &xen_9pfs_ops);
+#endif
#ifdef CONFIG_USB_LIBUSB
xen_be_register("qusb", &xen_usb_ops);
#endif
diff --git a/include/hw/xen/xen_backend.h b/include/hw/xen/xen_backend.h
index 4f4799a..7b72f1a 100644
--- a/include/hw/xen/xen_backend.h
+++ b/include/hw/xen/xen_backend.h
@@ -49,6 +49,9 @@ extern struct XenDevOps xen_console_ops; /* xen_console.c */
extern struct XenDevOps xen_kbdmouse_ops; /* xen_framebuffer.c */
extern struct XenDevOps xen_framebuffer_ops; /* xen_framebuffer.c */
extern struct XenDevOps xen_blkdev_ops; /* xen_disk.c */
+#ifdef CONFIG_VIRTFS
+extern struct XenDevOps xen_9pfs_ops; /* xen-9p-backend.c */
+#endif
extern struct XenDevOps xen_netdev_ops; /* xen_nic.c */
#ifdef CONFIG_USB_LIBUSB
extern struct XenDevOps xen_usb_ops; /* xen-usb.c */
--
1.9.1
^ permalink raw reply related [flat|nested] 40+ messages in thread
* [PATCH v3 9/9] xen/9pfs: build and register Xen 9pfs backend
@ 2017-03-16 20:01 ` Stefano Stabellini
0 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-16 20:01 UTC (permalink / raw)
To: qemu-devel
Cc: jgross, sstabellini, groug, Stefano Stabellini, Aneesh Kumar K.V,
anthony.perard, xen-devel
Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
CC: anthony.perard@citrix.com
CC: jgross@suse.com
CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
CC: Greg Kurz <groug@kaod.org>
---
hw/9pfs/Makefile.objs | 1 +
hw/xen/xen_backend.c | 3 +++
include/hw/xen/xen_backend.h | 3 +++
3 files changed, 7 insertions(+)
diff --git a/hw/9pfs/Makefile.objs b/hw/9pfs/Makefile.objs
index da0ae0c..1a89850 100644
--- a/hw/9pfs/Makefile.objs
+++ b/hw/9pfs/Makefile.objs
@@ -5,5 +5,6 @@ common-obj-y += coth.o cofs.o codir.o cofile.o
common-obj-y += coxattr.o 9p-synth.o
common-obj-$(CONFIG_OPEN_BY_HANDLE) += 9p-handle.o
common-obj-y += 9p-proxy.o
+common-obj-$(CONFIG_XEN) += xen-9p-backend.o
obj-y += virtio-9p-device.o
diff --git a/hw/xen/xen_backend.c b/hw/xen/xen_backend.c
index 6c21c37..fe737e9 100644
--- a/hw/xen/xen_backend.c
+++ b/hw/xen/xen_backend.c
@@ -585,6 +585,9 @@ void xen_be_register_common(void)
xen_be_register("console", &xen_console_ops);
xen_be_register("vkbd", &xen_kbdmouse_ops);
xen_be_register("qdisk", &xen_blkdev_ops);
+#ifdef CONFIG_VIRTFS
+ xen_be_register("9pfs", &xen_9pfs_ops);
+#endif
#ifdef CONFIG_USB_LIBUSB
xen_be_register("qusb", &xen_usb_ops);
#endif
diff --git a/include/hw/xen/xen_backend.h b/include/hw/xen/xen_backend.h
index 4f4799a..7b72f1a 100644
--- a/include/hw/xen/xen_backend.h
+++ b/include/hw/xen/xen_backend.h
@@ -49,6 +49,9 @@ extern struct XenDevOps xen_console_ops; /* xen_console.c */
extern struct XenDevOps xen_kbdmouse_ops; /* xen_framebuffer.c */
extern struct XenDevOps xen_framebuffer_ops; /* xen_framebuffer.c */
extern struct XenDevOps xen_blkdev_ops; /* xen_disk.c */
+#ifdef CONFIG_VIRTFS
+extern struct XenDevOps xen_9pfs_ops; /* xen-9p-backend.c */
+#endif
extern struct XenDevOps xen_netdev_ops; /* xen_nic.c */
#ifdef CONFIG_USB_LIBUSB
extern struct XenDevOps xen_usb_ops; /* xen-usb.c */
--
1.9.1
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply related [flat|nested] 40+ messages in thread
* Re: [Qemu-devel] [PATCH v3 1/9] xen: do not build backends for targets that do not support xen
2017-03-16 20:01 ` Stefano Stabellini
@ 2017-03-17 11:08 ` Greg Kurz
-1 siblings, 0 replies; 40+ messages in thread
From: Greg Kurz @ 2017-03-17 11:08 UTC (permalink / raw)
To: Stefano Stabellini
Cc: qemu-devel, xen-devel, jgross, Stefano Stabellini, pbonzini,
peter.maydell, rth, stefanha
[-- Attachment #1: Type: text/plain, Size: 4425 bytes --]
On Thu, 16 Mar 2017 13:01:50 -0700
Stefano Stabellini <sstabellini@kernel.org> wrote:
> Change Makefile.objs to use CONFIG_XEN instead of CONFIG_XEN_BACKEND, so
> that the Xen backends are only built for targets that support Xen.
>
> Set CONFIG_XEN in the toplevel Makefile to ensure that files that are
> built only once pick up Xen support properly.
>
> Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
> CC: groug@kaod.org
> CC: pbonzini@redhat.com
> CC: peter.maydell@linaro.org
> CC: rth@twiddle.net
> CC: stefanha@redhat.com
> ---
Tested-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
> Makefile | 1 +
> hw/block/Makefile.objs | 2 +-
> hw/char/Makefile.objs | 2 +-
> hw/display/Makefile.objs | 2 +-
> hw/net/Makefile.objs | 2 +-
> hw/usb/Makefile.objs | 2 +-
> hw/xen/Makefile.objs | 2 +-
> 7 files changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index 1c4c04f..b246138 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -26,6 +26,7 @@ endif
>
> CONFIG_SOFTMMU := $(if $(filter %-softmmu,$(TARGET_DIRS)),y)
> CONFIG_USER_ONLY := $(if $(filter %-user,$(TARGET_DIRS)),y)
> +CONFIG_XEN := $(CONFIG_XEN_BACKEND)
> CONFIG_ALL=y
> -include config-all-devices.mak
> -include config-all-disas.mak
> diff --git a/hw/block/Makefile.objs b/hw/block/Makefile.objs
> index d4c3ab7..e0ed980 100644
> --- a/hw/block/Makefile.objs
> +++ b/hw/block/Makefile.objs
> @@ -4,7 +4,7 @@ common-obj-$(CONFIG_SSI_M25P80) += m25p80.o
> common-obj-$(CONFIG_NAND) += nand.o
> common-obj-$(CONFIG_PFLASH_CFI01) += pflash_cfi01.o
> common-obj-$(CONFIG_PFLASH_CFI02) += pflash_cfi02.o
> -common-obj-$(CONFIG_XEN_BACKEND) += xen_disk.o
> +common-obj-$(CONFIG_XEN) += xen_disk.o
> common-obj-$(CONFIG_ECC) += ecc.o
> common-obj-$(CONFIG_ONENAND) += onenand.o
> common-obj-$(CONFIG_NVME_PCI) += nvme.o
> diff --git a/hw/char/Makefile.objs b/hw/char/Makefile.objs
> index 6ea76fe..725fdc4 100644
> --- a/hw/char/Makefile.objs
> +++ b/hw/char/Makefile.objs
> @@ -7,7 +7,7 @@ common-obj-$(CONFIG_SERIAL_ISA) += serial-isa.o
> common-obj-$(CONFIG_SERIAL_PCI) += serial-pci.o
> common-obj-$(CONFIG_VIRTIO) += virtio-console.o
> common-obj-$(CONFIG_XILINX) += xilinx_uartlite.o
> -common-obj-$(CONFIG_XEN_BACKEND) += xen_console.o
> +common-obj-$(CONFIG_XEN) += xen_console.o
> common-obj-$(CONFIG_CADENCE) += cadence_uart.o
>
> obj-$(CONFIG_EXYNOS4) += exynos4210_uart.o
> diff --git a/hw/display/Makefile.objs b/hw/display/Makefile.objs
> index 063889b..3d02e8b 100644
> --- a/hw/display/Makefile.objs
> +++ b/hw/display/Makefile.objs
> @@ -5,7 +5,7 @@ common-obj-$(CONFIG_JAZZ_LED) += jazz_led.o
> common-obj-$(CONFIG_PL110) += pl110.o
> common-obj-$(CONFIG_SSD0303) += ssd0303.o
> common-obj-$(CONFIG_SSD0323) += ssd0323.o
> -common-obj-$(CONFIG_XEN_BACKEND) += xenfb.o
> +common-obj-$(CONFIG_XEN) += xenfb.o
>
> common-obj-$(CONFIG_VGA_PCI) += vga-pci.o
> common-obj-$(CONFIG_VGA_ISA) += vga-isa.o
> diff --git a/hw/net/Makefile.objs b/hw/net/Makefile.objs
> index 610ed3e..6a95d92 100644
> --- a/hw/net/Makefile.objs
> +++ b/hw/net/Makefile.objs
> @@ -1,5 +1,5 @@
> common-obj-$(CONFIG_DP8393X) += dp8393x.o
> -common-obj-$(CONFIG_XEN_BACKEND) += xen_nic.o
> +common-obj-$(CONFIG_XEN) += xen_nic.o
>
> # PCI network cards
> common-obj-$(CONFIG_NE2000_PCI) += ne2000.o
> diff --git a/hw/usb/Makefile.objs b/hw/usb/Makefile.objs
> index 98b5c9d..5958be8 100644
> --- a/hw/usb/Makefile.objs
> +++ b/hw/usb/Makefile.objs
> @@ -40,5 +40,5 @@ common-obj-$(CONFIG_USB_REDIR) += redirect.o quirks.o
> common-obj-y += $(patsubst %,host-%.o,$(HOST_USB))
>
> ifeq ($(CONFIG_USB_LIBUSB),y)
> -common-obj-$(CONFIG_XEN_BACKEND) += xen-usb.o
> +common-obj-$(CONFIG_XEN) += xen-usb.o
> endif
> diff --git a/hw/xen/Makefile.objs b/hw/xen/Makefile.objs
> index 591cdc2..4be3ec9 100644
> --- a/hw/xen/Makefile.objs
> +++ b/hw/xen/Makefile.objs
> @@ -1,5 +1,5 @@
> # xen backend driver support
> -common-obj-$(CONFIG_XEN_BACKEND) += xen_backend.o xen_devconfig.o xen_pvdev.o
> +common-obj-$(CONFIG_XEN) += xen_backend.o xen_devconfig.o xen_pvdev.o
>
> obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen-host-pci-device.o
> obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pt.o xen_pt_config_init.o xen_pt_graphics.o xen_pt_msi.o
[-- Attachment #2: OpenPGP digital signature --]
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^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH v3 1/9] xen: do not build backends for targets that do not support xen
@ 2017-03-17 11:08 ` Greg Kurz
0 siblings, 0 replies; 40+ messages in thread
From: Greg Kurz @ 2017-03-17 11:08 UTC (permalink / raw)
To: Stefano Stabellini
Cc: jgross, peter.maydell, qemu-devel, Stefano Stabellini, stefanha,
pbonzini, xen-devel, rth
[-- Attachment #1.1: Type: text/plain, Size: 4425 bytes --]
On Thu, 16 Mar 2017 13:01:50 -0700
Stefano Stabellini <sstabellini@kernel.org> wrote:
> Change Makefile.objs to use CONFIG_XEN instead of CONFIG_XEN_BACKEND, so
> that the Xen backends are only built for targets that support Xen.
>
> Set CONFIG_XEN in the toplevel Makefile to ensure that files that are
> built only once pick up Xen support properly.
>
> Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
> CC: groug@kaod.org
> CC: pbonzini@redhat.com
> CC: peter.maydell@linaro.org
> CC: rth@twiddle.net
> CC: stefanha@redhat.com
> ---
Tested-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Greg Kurz <groug@kaod.org>
> Makefile | 1 +
> hw/block/Makefile.objs | 2 +-
> hw/char/Makefile.objs | 2 +-
> hw/display/Makefile.objs | 2 +-
> hw/net/Makefile.objs | 2 +-
> hw/usb/Makefile.objs | 2 +-
> hw/xen/Makefile.objs | 2 +-
> 7 files changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index 1c4c04f..b246138 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -26,6 +26,7 @@ endif
>
> CONFIG_SOFTMMU := $(if $(filter %-softmmu,$(TARGET_DIRS)),y)
> CONFIG_USER_ONLY := $(if $(filter %-user,$(TARGET_DIRS)),y)
> +CONFIG_XEN := $(CONFIG_XEN_BACKEND)
> CONFIG_ALL=y
> -include config-all-devices.mak
> -include config-all-disas.mak
> diff --git a/hw/block/Makefile.objs b/hw/block/Makefile.objs
> index d4c3ab7..e0ed980 100644
> --- a/hw/block/Makefile.objs
> +++ b/hw/block/Makefile.objs
> @@ -4,7 +4,7 @@ common-obj-$(CONFIG_SSI_M25P80) += m25p80.o
> common-obj-$(CONFIG_NAND) += nand.o
> common-obj-$(CONFIG_PFLASH_CFI01) += pflash_cfi01.o
> common-obj-$(CONFIG_PFLASH_CFI02) += pflash_cfi02.o
> -common-obj-$(CONFIG_XEN_BACKEND) += xen_disk.o
> +common-obj-$(CONFIG_XEN) += xen_disk.o
> common-obj-$(CONFIG_ECC) += ecc.o
> common-obj-$(CONFIG_ONENAND) += onenand.o
> common-obj-$(CONFIG_NVME_PCI) += nvme.o
> diff --git a/hw/char/Makefile.objs b/hw/char/Makefile.objs
> index 6ea76fe..725fdc4 100644
> --- a/hw/char/Makefile.objs
> +++ b/hw/char/Makefile.objs
> @@ -7,7 +7,7 @@ common-obj-$(CONFIG_SERIAL_ISA) += serial-isa.o
> common-obj-$(CONFIG_SERIAL_PCI) += serial-pci.o
> common-obj-$(CONFIG_VIRTIO) += virtio-console.o
> common-obj-$(CONFIG_XILINX) += xilinx_uartlite.o
> -common-obj-$(CONFIG_XEN_BACKEND) += xen_console.o
> +common-obj-$(CONFIG_XEN) += xen_console.o
> common-obj-$(CONFIG_CADENCE) += cadence_uart.o
>
> obj-$(CONFIG_EXYNOS4) += exynos4210_uart.o
> diff --git a/hw/display/Makefile.objs b/hw/display/Makefile.objs
> index 063889b..3d02e8b 100644
> --- a/hw/display/Makefile.objs
> +++ b/hw/display/Makefile.objs
> @@ -5,7 +5,7 @@ common-obj-$(CONFIG_JAZZ_LED) += jazz_led.o
> common-obj-$(CONFIG_PL110) += pl110.o
> common-obj-$(CONFIG_SSD0303) += ssd0303.o
> common-obj-$(CONFIG_SSD0323) += ssd0323.o
> -common-obj-$(CONFIG_XEN_BACKEND) += xenfb.o
> +common-obj-$(CONFIG_XEN) += xenfb.o
>
> common-obj-$(CONFIG_VGA_PCI) += vga-pci.o
> common-obj-$(CONFIG_VGA_ISA) += vga-isa.o
> diff --git a/hw/net/Makefile.objs b/hw/net/Makefile.objs
> index 610ed3e..6a95d92 100644
> --- a/hw/net/Makefile.objs
> +++ b/hw/net/Makefile.objs
> @@ -1,5 +1,5 @@
> common-obj-$(CONFIG_DP8393X) += dp8393x.o
> -common-obj-$(CONFIG_XEN_BACKEND) += xen_nic.o
> +common-obj-$(CONFIG_XEN) += xen_nic.o
>
> # PCI network cards
> common-obj-$(CONFIG_NE2000_PCI) += ne2000.o
> diff --git a/hw/usb/Makefile.objs b/hw/usb/Makefile.objs
> index 98b5c9d..5958be8 100644
> --- a/hw/usb/Makefile.objs
> +++ b/hw/usb/Makefile.objs
> @@ -40,5 +40,5 @@ common-obj-$(CONFIG_USB_REDIR) += redirect.o quirks.o
> common-obj-y += $(patsubst %,host-%.o,$(HOST_USB))
>
> ifeq ($(CONFIG_USB_LIBUSB),y)
> -common-obj-$(CONFIG_XEN_BACKEND) += xen-usb.o
> +common-obj-$(CONFIG_XEN) += xen-usb.o
> endif
> diff --git a/hw/xen/Makefile.objs b/hw/xen/Makefile.objs
> index 591cdc2..4be3ec9 100644
> --- a/hw/xen/Makefile.objs
> +++ b/hw/xen/Makefile.objs
> @@ -1,5 +1,5 @@
> # xen backend driver support
> -common-obj-$(CONFIG_XEN_BACKEND) += xen_backend.o xen_devconfig.o xen_pvdev.o
> +common-obj-$(CONFIG_XEN) += xen_backend.o xen_devconfig.o xen_pvdev.o
>
> obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen-host-pci-device.o
> obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pt.o xen_pt_config_init.o xen_pt_graphics.o xen_pt_msi.o
[-- Attachment #1.2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 181 bytes --]
[-- Attachment #2: Type: text/plain, Size: 127 bytes --]
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [Qemu-devel] [PATCH v3 1/9] xen: do not build backends for targets that do not support xen
2017-03-16 20:01 ` Stefano Stabellini
@ 2017-03-17 11:10 ` Paolo Bonzini
-1 siblings, 0 replies; 40+ messages in thread
From: Paolo Bonzini @ 2017-03-17 11:10 UTC (permalink / raw)
To: Stefano Stabellini, qemu-devel
Cc: xen-devel, jgross, groug, Stefano Stabellini, peter.maydell, rth,
stefanha
On 16/03/2017 21:01, Stefano Stabellini wrote:
> Change Makefile.objs to use CONFIG_XEN instead of CONFIG_XEN_BACKEND, so
> that the Xen backends are only built for targets that support Xen.
>
> Set CONFIG_XEN in the toplevel Makefile to ensure that files that are
> built only once pick up Xen support properly.
>
> Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
> CC: groug@kaod.org
> CC: pbonzini@redhat.com
> CC: peter.maydell@linaro.org
> CC: rth@twiddle.net
> CC: stefanha@redhat.com
> ---
> Makefile | 1 +
> hw/block/Makefile.objs | 2 +-
> hw/char/Makefile.objs | 2 +-
> hw/display/Makefile.objs | 2 +-
> hw/net/Makefile.objs | 2 +-
> hw/usb/Makefile.objs | 2 +-
> hw/xen/Makefile.objs | 2 +-
> 7 files changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index 1c4c04f..b246138 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -26,6 +26,7 @@ endif
>
> CONFIG_SOFTMMU := $(if $(filter %-softmmu,$(TARGET_DIRS)),y)
> CONFIG_USER_ONLY := $(if $(filter %-user,$(TARGET_DIRS)),y)
> +CONFIG_XEN := $(CONFIG_XEN_BACKEND)
> CONFIG_ALL=y
> -include config-all-devices.mak
> -include config-all-disas.mak
> diff --git a/hw/block/Makefile.objs b/hw/block/Makefile.objs
> index d4c3ab7..e0ed980 100644
> --- a/hw/block/Makefile.objs
> +++ b/hw/block/Makefile.objs
> @@ -4,7 +4,7 @@ common-obj-$(CONFIG_SSI_M25P80) += m25p80.o
> common-obj-$(CONFIG_NAND) += nand.o
> common-obj-$(CONFIG_PFLASH_CFI01) += pflash_cfi01.o
> common-obj-$(CONFIG_PFLASH_CFI02) += pflash_cfi02.o
> -common-obj-$(CONFIG_XEN_BACKEND) += xen_disk.o
> +common-obj-$(CONFIG_XEN) += xen_disk.o
> common-obj-$(CONFIG_ECC) += ecc.o
> common-obj-$(CONFIG_ONENAND) += onenand.o
> common-obj-$(CONFIG_NVME_PCI) += nvme.o
> diff --git a/hw/char/Makefile.objs b/hw/char/Makefile.objs
> index 6ea76fe..725fdc4 100644
> --- a/hw/char/Makefile.objs
> +++ b/hw/char/Makefile.objs
> @@ -7,7 +7,7 @@ common-obj-$(CONFIG_SERIAL_ISA) += serial-isa.o
> common-obj-$(CONFIG_SERIAL_PCI) += serial-pci.o
> common-obj-$(CONFIG_VIRTIO) += virtio-console.o
> common-obj-$(CONFIG_XILINX) += xilinx_uartlite.o
> -common-obj-$(CONFIG_XEN_BACKEND) += xen_console.o
> +common-obj-$(CONFIG_XEN) += xen_console.o
> common-obj-$(CONFIG_CADENCE) += cadence_uart.o
>
> obj-$(CONFIG_EXYNOS4) += exynos4210_uart.o
> diff --git a/hw/display/Makefile.objs b/hw/display/Makefile.objs
> index 063889b..3d02e8b 100644
> --- a/hw/display/Makefile.objs
> +++ b/hw/display/Makefile.objs
> @@ -5,7 +5,7 @@ common-obj-$(CONFIG_JAZZ_LED) += jazz_led.o
> common-obj-$(CONFIG_PL110) += pl110.o
> common-obj-$(CONFIG_SSD0303) += ssd0303.o
> common-obj-$(CONFIG_SSD0323) += ssd0323.o
> -common-obj-$(CONFIG_XEN_BACKEND) += xenfb.o
> +common-obj-$(CONFIG_XEN) += xenfb.o
>
> common-obj-$(CONFIG_VGA_PCI) += vga-pci.o
> common-obj-$(CONFIG_VGA_ISA) += vga-isa.o
> diff --git a/hw/net/Makefile.objs b/hw/net/Makefile.objs
> index 610ed3e..6a95d92 100644
> --- a/hw/net/Makefile.objs
> +++ b/hw/net/Makefile.objs
> @@ -1,5 +1,5 @@
> common-obj-$(CONFIG_DP8393X) += dp8393x.o
> -common-obj-$(CONFIG_XEN_BACKEND) += xen_nic.o
> +common-obj-$(CONFIG_XEN) += xen_nic.o
>
> # PCI network cards
> common-obj-$(CONFIG_NE2000_PCI) += ne2000.o
> diff --git a/hw/usb/Makefile.objs b/hw/usb/Makefile.objs
> index 98b5c9d..5958be8 100644
> --- a/hw/usb/Makefile.objs
> +++ b/hw/usb/Makefile.objs
> @@ -40,5 +40,5 @@ common-obj-$(CONFIG_USB_REDIR) += redirect.o quirks.o
> common-obj-y += $(patsubst %,host-%.o,$(HOST_USB))
>
> ifeq ($(CONFIG_USB_LIBUSB),y)
> -common-obj-$(CONFIG_XEN_BACKEND) += xen-usb.o
> +common-obj-$(CONFIG_XEN) += xen-usb.o
> endif
> diff --git a/hw/xen/Makefile.objs b/hw/xen/Makefile.objs
> index 591cdc2..4be3ec9 100644
> --- a/hw/xen/Makefile.objs
> +++ b/hw/xen/Makefile.objs
> @@ -1,5 +1,5 @@
> # xen backend driver support
> -common-obj-$(CONFIG_XEN_BACKEND) += xen_backend.o xen_devconfig.o xen_pvdev.o
> +common-obj-$(CONFIG_XEN) += xen_backend.o xen_devconfig.o xen_pvdev.o
>
> obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen-host-pci-device.o
> obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pt.o xen_pt_config_init.o xen_pt_graphics.o xen_pt_msi.o
>
I'm queuing this for 2.9 as a bugfix, adding Xen things to various
softcore emulators makes no sense.
Paolo
^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH v3 1/9] xen: do not build backends for targets that do not support xen
@ 2017-03-17 11:10 ` Paolo Bonzini
0 siblings, 0 replies; 40+ messages in thread
From: Paolo Bonzini @ 2017-03-17 11:10 UTC (permalink / raw)
To: Stefano Stabellini, qemu-devel
Cc: jgross, peter.maydell, groug, Stefano Stabellini, stefanha,
xen-devel, rth
On 16/03/2017 21:01, Stefano Stabellini wrote:
> Change Makefile.objs to use CONFIG_XEN instead of CONFIG_XEN_BACKEND, so
> that the Xen backends are only built for targets that support Xen.
>
> Set CONFIG_XEN in the toplevel Makefile to ensure that files that are
> built only once pick up Xen support properly.
>
> Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
> CC: groug@kaod.org
> CC: pbonzini@redhat.com
> CC: peter.maydell@linaro.org
> CC: rth@twiddle.net
> CC: stefanha@redhat.com
> ---
> Makefile | 1 +
> hw/block/Makefile.objs | 2 +-
> hw/char/Makefile.objs | 2 +-
> hw/display/Makefile.objs | 2 +-
> hw/net/Makefile.objs | 2 +-
> hw/usb/Makefile.objs | 2 +-
> hw/xen/Makefile.objs | 2 +-
> 7 files changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index 1c4c04f..b246138 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -26,6 +26,7 @@ endif
>
> CONFIG_SOFTMMU := $(if $(filter %-softmmu,$(TARGET_DIRS)),y)
> CONFIG_USER_ONLY := $(if $(filter %-user,$(TARGET_DIRS)),y)
> +CONFIG_XEN := $(CONFIG_XEN_BACKEND)
> CONFIG_ALL=y
> -include config-all-devices.mak
> -include config-all-disas.mak
> diff --git a/hw/block/Makefile.objs b/hw/block/Makefile.objs
> index d4c3ab7..e0ed980 100644
> --- a/hw/block/Makefile.objs
> +++ b/hw/block/Makefile.objs
> @@ -4,7 +4,7 @@ common-obj-$(CONFIG_SSI_M25P80) += m25p80.o
> common-obj-$(CONFIG_NAND) += nand.o
> common-obj-$(CONFIG_PFLASH_CFI01) += pflash_cfi01.o
> common-obj-$(CONFIG_PFLASH_CFI02) += pflash_cfi02.o
> -common-obj-$(CONFIG_XEN_BACKEND) += xen_disk.o
> +common-obj-$(CONFIG_XEN) += xen_disk.o
> common-obj-$(CONFIG_ECC) += ecc.o
> common-obj-$(CONFIG_ONENAND) += onenand.o
> common-obj-$(CONFIG_NVME_PCI) += nvme.o
> diff --git a/hw/char/Makefile.objs b/hw/char/Makefile.objs
> index 6ea76fe..725fdc4 100644
> --- a/hw/char/Makefile.objs
> +++ b/hw/char/Makefile.objs
> @@ -7,7 +7,7 @@ common-obj-$(CONFIG_SERIAL_ISA) += serial-isa.o
> common-obj-$(CONFIG_SERIAL_PCI) += serial-pci.o
> common-obj-$(CONFIG_VIRTIO) += virtio-console.o
> common-obj-$(CONFIG_XILINX) += xilinx_uartlite.o
> -common-obj-$(CONFIG_XEN_BACKEND) += xen_console.o
> +common-obj-$(CONFIG_XEN) += xen_console.o
> common-obj-$(CONFIG_CADENCE) += cadence_uart.o
>
> obj-$(CONFIG_EXYNOS4) += exynos4210_uart.o
> diff --git a/hw/display/Makefile.objs b/hw/display/Makefile.objs
> index 063889b..3d02e8b 100644
> --- a/hw/display/Makefile.objs
> +++ b/hw/display/Makefile.objs
> @@ -5,7 +5,7 @@ common-obj-$(CONFIG_JAZZ_LED) += jazz_led.o
> common-obj-$(CONFIG_PL110) += pl110.o
> common-obj-$(CONFIG_SSD0303) += ssd0303.o
> common-obj-$(CONFIG_SSD0323) += ssd0323.o
> -common-obj-$(CONFIG_XEN_BACKEND) += xenfb.o
> +common-obj-$(CONFIG_XEN) += xenfb.o
>
> common-obj-$(CONFIG_VGA_PCI) += vga-pci.o
> common-obj-$(CONFIG_VGA_ISA) += vga-isa.o
> diff --git a/hw/net/Makefile.objs b/hw/net/Makefile.objs
> index 610ed3e..6a95d92 100644
> --- a/hw/net/Makefile.objs
> +++ b/hw/net/Makefile.objs
> @@ -1,5 +1,5 @@
> common-obj-$(CONFIG_DP8393X) += dp8393x.o
> -common-obj-$(CONFIG_XEN_BACKEND) += xen_nic.o
> +common-obj-$(CONFIG_XEN) += xen_nic.o
>
> # PCI network cards
> common-obj-$(CONFIG_NE2000_PCI) += ne2000.o
> diff --git a/hw/usb/Makefile.objs b/hw/usb/Makefile.objs
> index 98b5c9d..5958be8 100644
> --- a/hw/usb/Makefile.objs
> +++ b/hw/usb/Makefile.objs
> @@ -40,5 +40,5 @@ common-obj-$(CONFIG_USB_REDIR) += redirect.o quirks.o
> common-obj-y += $(patsubst %,host-%.o,$(HOST_USB))
>
> ifeq ($(CONFIG_USB_LIBUSB),y)
> -common-obj-$(CONFIG_XEN_BACKEND) += xen-usb.o
> +common-obj-$(CONFIG_XEN) += xen-usb.o
> endif
> diff --git a/hw/xen/Makefile.objs b/hw/xen/Makefile.objs
> index 591cdc2..4be3ec9 100644
> --- a/hw/xen/Makefile.objs
> +++ b/hw/xen/Makefile.objs
> @@ -1,5 +1,5 @@
> # xen backend driver support
> -common-obj-$(CONFIG_XEN_BACKEND) += xen_backend.o xen_devconfig.o xen_pvdev.o
> +common-obj-$(CONFIG_XEN) += xen_backend.o xen_devconfig.o xen_pvdev.o
>
> obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen-host-pci-device.o
> obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pt.o xen_pt_config_init.o xen_pt_graphics.o xen_pt_msi.o
>
I'm queuing this for 2.9 as a bugfix, adding Xen things to various
softcore emulators makes no sense.
Paolo
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [Qemu-devel] [PATCH v3 2/9] xen: import ring.h from xen
2017-03-16 20:01 ` Stefano Stabellini
@ 2017-03-17 11:15 ` Greg Kurz
-1 siblings, 0 replies; 40+ messages in thread
From: Greg Kurz @ 2017-03-17 11:15 UTC (permalink / raw)
To: Stefano Stabellini
Cc: qemu-devel, xen-devel, jgross, Stefano Stabellini, anthony.perard
[-- Attachment #1: Type: text/plain, Size: 27623 bytes --]
On Thu, 16 Mar 2017 13:01:51 -0700
Stefano Stabellini <sstabellini@kernel.org> wrote:
> Do not use the ring.h header installed on the system. Instead, import
> the header into the QEMU codebase. This avoids problems when QEMU is
> built against a Xen version too old to provide all the ring macros.
>
> Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
> CC: anthony.perard@citrix.com
> CC: jgross@suse.com
> ---
> NB: The new macros have not been committed to Xen yet. Do not apply this
> patch until they do.
> ---
There are many trailing spaces in include/hw/xen/io/ring.h, but I guess this
is acceptable for an imported header.
Reviewed-by: Greg Kurz <groug@kaod.org>
> ---
> hw/block/xen_blkif.h | 2 +-
> hw/usb/xen-usb.c | 2 +-
> include/hw/xen/io/ring.h | 455 +++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 457 insertions(+), 2 deletions(-)
> create mode 100644 include/hw/xen/io/ring.h
>
> diff --git a/hw/block/xen_blkif.h b/hw/block/xen_blkif.h
> index 3300b6f..3e6e1ea 100644
> --- a/hw/block/xen_blkif.h
> +++ b/hw/block/xen_blkif.h
> @@ -1,7 +1,7 @@
> #ifndef XEN_BLKIF_H
> #define XEN_BLKIF_H
>
> -#include <xen/io/ring.h>
> +#include "hw/xen/io/ring.h"
> #include <xen/io/blkif.h>
> #include <xen/io/protocols.h>
>
> diff --git a/hw/usb/xen-usb.c b/hw/usb/xen-usb.c
> index 8e676e6..370b3d9 100644
> --- a/hw/usb/xen-usb.c
> +++ b/hw/usb/xen-usb.c
> @@ -33,7 +33,7 @@
> #include "qapi/qmp/qint.h"
> #include "qapi/qmp/qstring.h"
>
> -#include <xen/io/ring.h>
> +#include "hw/xen/io/ring.h"
> #include <xen/io/usbif.h>
>
> /*
> diff --git a/include/hw/xen/io/ring.h b/include/hw/xen/io/ring.h
> new file mode 100644
> index 0000000..cf01fc3
> --- /dev/null
> +++ b/include/hw/xen/io/ring.h
> @@ -0,0 +1,455 @@
> +/******************************************************************************
> + * ring.h
> + *
> + * Shared producer-consumer ring macros.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a copy
> + * of this software and associated documentation files (the "Software"), to
> + * deal in the Software without restriction, including without limitation the
> + * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
> + * sell copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
> + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Tim Deegan and Andrew Warfield November 2004.
> + */
> +
> +#ifndef __XEN_PUBLIC_IO_RING_H__
> +#define __XEN_PUBLIC_IO_RING_H__
> +
> +#if __XEN_INTERFACE_VERSION__ < 0x00030208
> +#define xen_mb() mb()
> +#define xen_rmb() rmb()
> +#define xen_wmb() wmb()
> +#endif
> +
> +typedef unsigned int RING_IDX;
> +
> +/* Round a 32-bit unsigned constant down to the nearest power of two. */
> +#define __RD2(_x) (((_x) & 0x00000002) ? 0x2 : ((_x) & 0x1))
> +#define __RD4(_x) (((_x) & 0x0000000c) ? __RD2((_x)>>2)<<2 : __RD2(_x))
> +#define __RD8(_x) (((_x) & 0x000000f0) ? __RD4((_x)>>4)<<4 : __RD4(_x))
> +#define __RD16(_x) (((_x) & 0x0000ff00) ? __RD8((_x)>>8)<<8 : __RD8(_x))
> +#define __RD32(_x) (((_x) & 0xffff0000) ? __RD16((_x)>>16)<<16 : __RD16(_x))
> +
> +/*
> + * Calculate size of a shared ring, given the total available space for the
> + * ring and indexes (_sz), and the name tag of the request/response structure.
> + * A ring contains as many entries as will fit, rounded down to the nearest
> + * power of two (so we can mask with (size-1) to loop around).
> + */
> +#define __CONST_RING_SIZE(_s, _sz) \
> + (__RD32(((_sz) - offsetof(struct _s##_sring, ring)) / \
> + sizeof(((struct _s##_sring *)0)->ring[0])))
> +/*
> + * The same for passing in an actual pointer instead of a name tag.
> + */
> +#define __RING_SIZE(_s, _sz) \
> + (__RD32(((_sz) - (long)(_s)->ring + (long)(_s)) / sizeof((_s)->ring[0])))
> +
> +/*
> + * Macros to make the correct C datatypes for a new kind of ring.
> + *
> + * To make a new ring datatype, you need to have two message structures,
> + * let's say request_t, and response_t already defined.
> + *
> + * In a header where you want the ring datatype declared, you then do:
> + *
> + * DEFINE_RING_TYPES(mytag, request_t, response_t);
> + *
> + * These expand out to give you a set of types, as you can see below.
> + * The most important of these are:
> + *
> + * mytag_sring_t - The shared ring.
> + * mytag_front_ring_t - The 'front' half of the ring.
> + * mytag_back_ring_t - The 'back' half of the ring.
> + *
> + * To initialize a ring in your code you need to know the location and size
> + * of the shared memory area (PAGE_SIZE, for instance). To initialise
> + * the front half:
> + *
> + * mytag_front_ring_t front_ring;
> + * SHARED_RING_INIT((mytag_sring_t *)shared_page);
> + * FRONT_RING_INIT(&front_ring, (mytag_sring_t *)shared_page, PAGE_SIZE);
> + *
> + * Initializing the back follows similarly (note that only the front
> + * initializes the shared ring):
> + *
> + * mytag_back_ring_t back_ring;
> + * BACK_RING_INIT(&back_ring, (mytag_sring_t *)shared_page, PAGE_SIZE);
> + */
> +
> +#define DEFINE_RING_TYPES(__name, __req_t, __rsp_t) \
> + \
> +/* Shared ring entry */ \
> +union __name##_sring_entry { \
> + __req_t req; \
> + __rsp_t rsp; \
> +}; \
> + \
> +/* Shared ring page */ \
> +struct __name##_sring { \
> + RING_IDX req_prod, req_event; \
> + RING_IDX rsp_prod, rsp_event; \
> + union { \
> + struct { \
> + uint8_t smartpoll_active; \
> + } netif; \
> + struct { \
> + uint8_t msg; \
> + } tapif_user; \
> + uint8_t pvt_pad[4]; \
> + } pvt; \
> + uint8_t __pad[44]; \
> + union __name##_sring_entry ring[1]; /* variable-length */ \
> +}; \
> + \
> +/* "Front" end's private variables */ \
> +struct __name##_front_ring { \
> + RING_IDX req_prod_pvt; \
> + RING_IDX rsp_cons; \
> + unsigned int nr_ents; \
> + struct __name##_sring *sring; \
> +}; \
> + \
> +/* "Back" end's private variables */ \
> +struct __name##_back_ring { \
> + RING_IDX rsp_prod_pvt; \
> + RING_IDX req_cons; \
> + unsigned int nr_ents; \
> + struct __name##_sring *sring; \
> +}; \
> + \
> +/* Syntactic sugar */ \
> +typedef struct __name##_sring __name##_sring_t; \
> +typedef struct __name##_front_ring __name##_front_ring_t; \
> +typedef struct __name##_back_ring __name##_back_ring_t
> +
> +/*
> + * Macros for manipulating rings.
> + *
> + * FRONT_RING_whatever works on the "front end" of a ring: here
> + * requests are pushed on to the ring and responses taken off it.
> + *
> + * BACK_RING_whatever works on the "back end" of a ring: here
> + * requests are taken off the ring and responses put on.
> + *
> + * N.B. these macros do NO INTERLOCKS OR FLOW CONTROL.
> + * This is OK in 1-for-1 request-response situations where the
> + * requestor (front end) never has more than RING_SIZE()-1
> + * outstanding requests.
> + */
> +
> +/* Initialising empty rings */
> +#define SHARED_RING_INIT(_s) do { \
> + (_s)->req_prod = (_s)->rsp_prod = 0; \
> + (_s)->req_event = (_s)->rsp_event = 1; \
> + (void)memset((_s)->pvt.pvt_pad, 0, sizeof((_s)->pvt.pvt_pad)); \
> + (void)memset((_s)->__pad, 0, sizeof((_s)->__pad)); \
> +} while(0)
> +
> +#define FRONT_RING_INIT(_r, _s, __size) do { \
> + (_r)->req_prod_pvt = 0; \
> + (_r)->rsp_cons = 0; \
> + (_r)->nr_ents = __RING_SIZE(_s, __size); \
> + (_r)->sring = (_s); \
> +} while (0)
> +
> +#define BACK_RING_INIT(_r, _s, __size) do { \
> + (_r)->rsp_prod_pvt = 0; \
> + (_r)->req_cons = 0; \
> + (_r)->nr_ents = __RING_SIZE(_s, __size); \
> + (_r)->sring = (_s); \
> +} while (0)
> +
> +/* How big is this ring? */
> +#define RING_SIZE(_r) \
> + ((_r)->nr_ents)
> +
> +/* Number of free requests (for use on front side only). */
> +#define RING_FREE_REQUESTS(_r) \
> + (RING_SIZE(_r) - ((_r)->req_prod_pvt - (_r)->rsp_cons))
> +
> +/* Test if there is an empty slot available on the front ring.
> + * (This is only meaningful from the front. )
> + */
> +#define RING_FULL(_r) \
> + (RING_FREE_REQUESTS(_r) == 0)
> +
> +/* Test if there are outstanding messages to be processed on a ring. */
> +#define RING_HAS_UNCONSUMED_RESPONSES(_r) \
> + ((_r)->sring->rsp_prod - (_r)->rsp_cons)
> +
> +#ifdef __GNUC__
> +#define RING_HAS_UNCONSUMED_REQUESTS(_r) ({ \
> + unsigned int req = (_r)->sring->req_prod - (_r)->req_cons; \
> + unsigned int rsp = RING_SIZE(_r) - \
> + ((_r)->req_cons - (_r)->rsp_prod_pvt); \
> + req < rsp ? req : rsp; \
> +})
> +#else
> +/* Same as above, but without the nice GCC ({ ... }) syntax. */
> +#define RING_HAS_UNCONSUMED_REQUESTS(_r) \
> + ((((_r)->sring->req_prod - (_r)->req_cons) < \
> + (RING_SIZE(_r) - ((_r)->req_cons - (_r)->rsp_prod_pvt))) ? \
> + ((_r)->sring->req_prod - (_r)->req_cons) : \
> + (RING_SIZE(_r) - ((_r)->req_cons - (_r)->rsp_prod_pvt)))
> +#endif
> +
> +/* Direct access to individual ring elements, by index. */
> +#define RING_GET_REQUEST(_r, _idx) \
> + (&((_r)->sring->ring[((_idx) & (RING_SIZE(_r) - 1))].req))
> +
> +/*
> + * Get a local copy of a request.
> + *
> + * Use this in preference to RING_GET_REQUEST() so all processing is
> + * done on a local copy that cannot be modified by the other end.
> + *
> + * Note that https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145 may cause this
> + * to be ineffective where _req is a struct which consists of only bitfields.
> + */
> +#define RING_COPY_REQUEST(_r, _idx, _req) do { \
> + /* Use volatile to force the copy into _req. */ \
> + *(_req) = *(volatile typeof(_req))RING_GET_REQUEST(_r, _idx); \
> +} while (0)
> +
> +#define RING_GET_RESPONSE(_r, _idx) \
> + (&((_r)->sring->ring[((_idx) & (RING_SIZE(_r) - 1))].rsp))
> +
> +/* Loop termination condition: Would the specified index overflow the ring? */
> +#define RING_REQUEST_CONS_OVERFLOW(_r, _cons) \
> + (((_cons) - (_r)->rsp_prod_pvt) >= RING_SIZE(_r))
> +
> +/* Ill-behaved frontend determination: Can there be this many requests? */
> +#define RING_REQUEST_PROD_OVERFLOW(_r, _prod) \
> + (((_prod) - (_r)->rsp_prod_pvt) > RING_SIZE(_r))
> +
> +#define RING_PUSH_REQUESTS(_r) do { \
> + xen_wmb(); /* back sees requests /before/ updated producer index */ \
> + (_r)->sring->req_prod = (_r)->req_prod_pvt; \
> +} while (0)
> +
> +#define RING_PUSH_RESPONSES(_r) do { \
> + xen_wmb(); /* front sees resps /before/ updated producer index */ \
> + (_r)->sring->rsp_prod = (_r)->rsp_prod_pvt; \
> +} while (0)
> +
> +/*
> + * Notification hold-off (req_event and rsp_event):
> + *
> + * When queueing requests or responses on a shared ring, it may not always be
> + * necessary to notify the remote end. For example, if requests are in flight
> + * in a backend, the front may be able to queue further requests without
> + * notifying the back (if the back checks for new requests when it queues
> + * responses).
> + *
> + * When enqueuing requests or responses:
> + *
> + * Use RING_PUSH_{REQUESTS,RESPONSES}_AND_CHECK_NOTIFY(). The second argument
> + * is a boolean return value. True indicates that the receiver requires an
> + * asynchronous notification.
> + *
> + * After dequeuing requests or responses (before sleeping the connection):
> + *
> + * Use RING_FINAL_CHECK_FOR_REQUESTS() or RING_FINAL_CHECK_FOR_RESPONSES().
> + * The second argument is a boolean return value. True indicates that there
> + * are pending messages on the ring (i.e., the connection should not be put
> + * to sleep).
> + *
> + * These macros will set the req_event/rsp_event field to trigger a
> + * notification on the very next message that is enqueued. If you want to
> + * create batches of work (i.e., only receive a notification after several
> + * messages have been enqueued) then you will need to create a customised
> + * version of the FINAL_CHECK macro in your own code, which sets the event
> + * field appropriately.
> + */
> +
> +#define RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(_r, _notify) do { \
> + RING_IDX __old = (_r)->sring->req_prod; \
> + RING_IDX __new = (_r)->req_prod_pvt; \
> + xen_wmb(); /* back sees requests /before/ updated producer index */ \
> + (_r)->sring->req_prod = __new; \
> + xen_mb(); /* back sees new requests /before/ we check req_event */ \
> + (_notify) = ((RING_IDX)(__new - (_r)->sring->req_event) < \
> + (RING_IDX)(__new - __old)); \
> +} while (0)
> +
> +#define RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(_r, _notify) do { \
> + RING_IDX __old = (_r)->sring->rsp_prod; \
> + RING_IDX __new = (_r)->rsp_prod_pvt; \
> + xen_wmb(); /* front sees resps /before/ updated producer index */ \
> + (_r)->sring->rsp_prod = __new; \
> + xen_mb(); /* front sees new resps /before/ we check rsp_event */ \
> + (_notify) = ((RING_IDX)(__new - (_r)->sring->rsp_event) < \
> + (RING_IDX)(__new - __old)); \
> +} while (0)
> +
> +#define RING_FINAL_CHECK_FOR_REQUESTS(_r, _work_to_do) do { \
> + (_work_to_do) = RING_HAS_UNCONSUMED_REQUESTS(_r); \
> + if (_work_to_do) break; \
> + (_r)->sring->req_event = (_r)->req_cons + 1; \
> + xen_mb(); \
> + (_work_to_do) = RING_HAS_UNCONSUMED_REQUESTS(_r); \
> +} while (0)
> +
> +#define RING_FINAL_CHECK_FOR_RESPONSES(_r, _work_to_do) do { \
> + (_work_to_do) = RING_HAS_UNCONSUMED_RESPONSES(_r); \
> + if (_work_to_do) break; \
> + (_r)->sring->rsp_event = (_r)->rsp_cons + 1; \
> + xen_mb(); \
> + (_work_to_do) = RING_HAS_UNCONSUMED_RESPONSES(_r); \
> +} while (0)
> +
> +
> +/*
> + * DEFINE_XEN_FLEX_RING_AND_INTF defines two monodirectional rings and
> + * functions to check if there is data on the ring, and to read and
> + * write to them.
> + *
> + * DEFINE_XEN_FLEX_RING is similar to DEFINE_XEN_FLEX_RING_AND_INTF, but
> + * does not define the indexes page. As different protocols can have
> + * extensions to the basic format, this macro allow them to define their
> + * own struct.
> + *
> + * XEN_FLEX_RING_SIZE
> + * Convenience macro to calculate the size of one of the two rings
> + * from the overall order.
> + *
> + * $NAME_mask
> + * Function to apply the size mask to an index, to reduce the index
> + * within the range [0-size].
> + *
> + * $NAME_read_packet
> + * Function to read data from the ring. The amount of data to read is
> + * specified by the "size" argument.
> + *
> + * $NAME_write_packet
> + * Function to write data to the ring. The amount of data to write is
> + * specified by the "size" argument.
> + *
> + * $NAME_get_ring_ptr
> + * Convenience function that returns a pointer to read/write to the
> + * ring at the right location.
> + *
> + * $NAME_data_intf
> + * Indexes page, shared between frontend and backend. It also
> + * contains the array of grant refs.
> + *
> + * $NAME_queued
> + * Function to calculate how many bytes are currently on the ring,
> + * ready to be read. It can also be used to calculate how much free
> + * space is currently on the ring (ring_size - $NAME_queued()).
> + */
> +#define XEN_FLEX_RING_SIZE(order) \
> + (1UL << (order + PAGE_SHIFT - 1))
> +
> +#define DEFINE_XEN_FLEX_RING_AND_INTF(name) \
> +struct name##_data_intf { \
> + RING_IDX in_cons, in_prod; \
> + \
> + uint8_t pad1[56]; \
> + \
> + RING_IDX out_cons, out_prod; \
> + \
> + uint8_t pad2[56]; \
> + \
> + RING_IDX ring_order; \
> + grant_ref_t ref[]; \
> +}; \
> +DEFINE_XEN_FLEX_RING(name);
> +
> +#define DEFINE_XEN_FLEX_RING(name) \
> +static inline RING_IDX name##_mask(RING_IDX idx, RING_IDX ring_size) \
> +{ \
> + return (idx & (ring_size - 1)); \
> +} \
> + \
> +static inline RING_IDX name##_mask_order(RING_IDX idx, RING_IDX ring_order) \
> +{ \
> + return (idx & (XEN_FLEX_RING_SIZE(ring_order) - 1)); \
> +} \
> + \
> +static inline unsigned char* name##_get_ring_ptr(unsigned char *buf, \
> + RING_IDX idx, \
> + RING_IDX ring_order) \
> +{ \
> + return buf + name##_mask_order(idx, ring_order); \
> +} \
> + \
> +static inline void name##_read_packet(const unsigned char *buf, \
> + RING_IDX masked_prod, RING_IDX *masked_cons, \
> + RING_IDX ring_size, void *opaque, size_t size) { \
> + if (*masked_cons < masked_prod || \
> + size <= ring_size - *masked_cons) { \
> + memcpy(opaque, buf + *masked_cons, size); \
> + } else { \
> + memcpy(opaque, buf + *masked_cons, ring_size - *masked_cons); \
> + memcpy((unsigned char *)opaque + ring_size - *masked_cons, buf, \
> + size - (ring_size - *masked_cons)); \
> + } \
> + *masked_cons = name##_mask(*masked_cons + size, ring_size); \
> +} \
> + \
> +static inline void name##_write_packet(unsigned char *buf, \
> + RING_IDX *masked_prod, RING_IDX masked_cons, \
> + RING_IDX ring_size, const void *opaque, size_t size) { \
> + if (*masked_prod < masked_cons || \
> + size <= ring_size - *masked_prod) { \
> + memcpy(buf + *masked_prod, opaque, size); \
> + } else { \
> + memcpy(buf + *masked_prod, opaque, ring_size - *masked_prod); \
> + memcpy(buf, (unsigned char *)opaque + (ring_size - *masked_prod), \
> + size - (ring_size - *masked_prod)); \
> + } \
> + *masked_prod = name##_mask(*masked_prod + size, ring_size); \
> +} \
> + \
> +struct name##_data { \
> + unsigned char *in; /* half of the allocation */ \
> + unsigned char *out; /* half of the allocation */ \
> +}; \
> + \
> + \
> +static inline RING_IDX name##_queued(RING_IDX prod, \
> + RING_IDX cons, RING_IDX ring_size) \
> +{ \
> + RING_IDX size; \
> + \
> + if (prod == cons) \
> + return 0; \
> + \
> + prod = name##_mask(prod, ring_size); \
> + cons = name##_mask(cons, ring_size); \
> + \
> + if (prod == cons) \
> + return ring_size; \
> + \
> + if (prod > cons) \
> + size = prod - cons; \
> + else \
> + size = ring_size - (cons - prod); \
> + return size; \
> +};
> +
> +#endif /* __XEN_PUBLIC_IO_RING_H__ */
> +
> +/*
> + * Local variables:
> + * mode: C
> + * c-file-style: "BSD"
> + * c-basic-offset: 4
> + * tab-width: 4
> + * indent-tabs-mode: nil
> + * End:
> + */
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^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH v3 2/9] xen: import ring.h from xen
@ 2017-03-17 11:15 ` Greg Kurz
0 siblings, 0 replies; 40+ messages in thread
From: Greg Kurz @ 2017-03-17 11:15 UTC (permalink / raw)
To: Stefano Stabellini
Cc: jgross, xen-devel, Stefano Stabellini, qemu-devel, anthony.perard
[-- Attachment #1.1: Type: text/plain, Size: 27623 bytes --]
On Thu, 16 Mar 2017 13:01:51 -0700
Stefano Stabellini <sstabellini@kernel.org> wrote:
> Do not use the ring.h header installed on the system. Instead, import
> the header into the QEMU codebase. This avoids problems when QEMU is
> built against a Xen version too old to provide all the ring macros.
>
> Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
> CC: anthony.perard@citrix.com
> CC: jgross@suse.com
> ---
> NB: The new macros have not been committed to Xen yet. Do not apply this
> patch until they do.
> ---
There are many trailing spaces in include/hw/xen/io/ring.h, but I guess this
is acceptable for an imported header.
Reviewed-by: Greg Kurz <groug@kaod.org>
> ---
> hw/block/xen_blkif.h | 2 +-
> hw/usb/xen-usb.c | 2 +-
> include/hw/xen/io/ring.h | 455 +++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 457 insertions(+), 2 deletions(-)
> create mode 100644 include/hw/xen/io/ring.h
>
> diff --git a/hw/block/xen_blkif.h b/hw/block/xen_blkif.h
> index 3300b6f..3e6e1ea 100644
> --- a/hw/block/xen_blkif.h
> +++ b/hw/block/xen_blkif.h
> @@ -1,7 +1,7 @@
> #ifndef XEN_BLKIF_H
> #define XEN_BLKIF_H
>
> -#include <xen/io/ring.h>
> +#include "hw/xen/io/ring.h"
> #include <xen/io/blkif.h>
> #include <xen/io/protocols.h>
>
> diff --git a/hw/usb/xen-usb.c b/hw/usb/xen-usb.c
> index 8e676e6..370b3d9 100644
> --- a/hw/usb/xen-usb.c
> +++ b/hw/usb/xen-usb.c
> @@ -33,7 +33,7 @@
> #include "qapi/qmp/qint.h"
> #include "qapi/qmp/qstring.h"
>
> -#include <xen/io/ring.h>
> +#include "hw/xen/io/ring.h"
> #include <xen/io/usbif.h>
>
> /*
> diff --git a/include/hw/xen/io/ring.h b/include/hw/xen/io/ring.h
> new file mode 100644
> index 0000000..cf01fc3
> --- /dev/null
> +++ b/include/hw/xen/io/ring.h
> @@ -0,0 +1,455 @@
> +/******************************************************************************
> + * ring.h
> + *
> + * Shared producer-consumer ring macros.
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a copy
> + * of this software and associated documentation files (the "Software"), to
> + * deal in the Software without restriction, including without limitation the
> + * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
> + * sell copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
> + * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
> + * DEALINGS IN THE SOFTWARE.
> + *
> + * Tim Deegan and Andrew Warfield November 2004.
> + */
> +
> +#ifndef __XEN_PUBLIC_IO_RING_H__
> +#define __XEN_PUBLIC_IO_RING_H__
> +
> +#if __XEN_INTERFACE_VERSION__ < 0x00030208
> +#define xen_mb() mb()
> +#define xen_rmb() rmb()
> +#define xen_wmb() wmb()
> +#endif
> +
> +typedef unsigned int RING_IDX;
> +
> +/* Round a 32-bit unsigned constant down to the nearest power of two. */
> +#define __RD2(_x) (((_x) & 0x00000002) ? 0x2 : ((_x) & 0x1))
> +#define __RD4(_x) (((_x) & 0x0000000c) ? __RD2((_x)>>2)<<2 : __RD2(_x))
> +#define __RD8(_x) (((_x) & 0x000000f0) ? __RD4((_x)>>4)<<4 : __RD4(_x))
> +#define __RD16(_x) (((_x) & 0x0000ff00) ? __RD8((_x)>>8)<<8 : __RD8(_x))
> +#define __RD32(_x) (((_x) & 0xffff0000) ? __RD16((_x)>>16)<<16 : __RD16(_x))
> +
> +/*
> + * Calculate size of a shared ring, given the total available space for the
> + * ring and indexes (_sz), and the name tag of the request/response structure.
> + * A ring contains as many entries as will fit, rounded down to the nearest
> + * power of two (so we can mask with (size-1) to loop around).
> + */
> +#define __CONST_RING_SIZE(_s, _sz) \
> + (__RD32(((_sz) - offsetof(struct _s##_sring, ring)) / \
> + sizeof(((struct _s##_sring *)0)->ring[0])))
> +/*
> + * The same for passing in an actual pointer instead of a name tag.
> + */
> +#define __RING_SIZE(_s, _sz) \
> + (__RD32(((_sz) - (long)(_s)->ring + (long)(_s)) / sizeof((_s)->ring[0])))
> +
> +/*
> + * Macros to make the correct C datatypes for a new kind of ring.
> + *
> + * To make a new ring datatype, you need to have two message structures,
> + * let's say request_t, and response_t already defined.
> + *
> + * In a header where you want the ring datatype declared, you then do:
> + *
> + * DEFINE_RING_TYPES(mytag, request_t, response_t);
> + *
> + * These expand out to give you a set of types, as you can see below.
> + * The most important of these are:
> + *
> + * mytag_sring_t - The shared ring.
> + * mytag_front_ring_t - The 'front' half of the ring.
> + * mytag_back_ring_t - The 'back' half of the ring.
> + *
> + * To initialize a ring in your code you need to know the location and size
> + * of the shared memory area (PAGE_SIZE, for instance). To initialise
> + * the front half:
> + *
> + * mytag_front_ring_t front_ring;
> + * SHARED_RING_INIT((mytag_sring_t *)shared_page);
> + * FRONT_RING_INIT(&front_ring, (mytag_sring_t *)shared_page, PAGE_SIZE);
> + *
> + * Initializing the back follows similarly (note that only the front
> + * initializes the shared ring):
> + *
> + * mytag_back_ring_t back_ring;
> + * BACK_RING_INIT(&back_ring, (mytag_sring_t *)shared_page, PAGE_SIZE);
> + */
> +
> +#define DEFINE_RING_TYPES(__name, __req_t, __rsp_t) \
> + \
> +/* Shared ring entry */ \
> +union __name##_sring_entry { \
> + __req_t req; \
> + __rsp_t rsp; \
> +}; \
> + \
> +/* Shared ring page */ \
> +struct __name##_sring { \
> + RING_IDX req_prod, req_event; \
> + RING_IDX rsp_prod, rsp_event; \
> + union { \
> + struct { \
> + uint8_t smartpoll_active; \
> + } netif; \
> + struct { \
> + uint8_t msg; \
> + } tapif_user; \
> + uint8_t pvt_pad[4]; \
> + } pvt; \
> + uint8_t __pad[44]; \
> + union __name##_sring_entry ring[1]; /* variable-length */ \
> +}; \
> + \
> +/* "Front" end's private variables */ \
> +struct __name##_front_ring { \
> + RING_IDX req_prod_pvt; \
> + RING_IDX rsp_cons; \
> + unsigned int nr_ents; \
> + struct __name##_sring *sring; \
> +}; \
> + \
> +/* "Back" end's private variables */ \
> +struct __name##_back_ring { \
> + RING_IDX rsp_prod_pvt; \
> + RING_IDX req_cons; \
> + unsigned int nr_ents; \
> + struct __name##_sring *sring; \
> +}; \
> + \
> +/* Syntactic sugar */ \
> +typedef struct __name##_sring __name##_sring_t; \
> +typedef struct __name##_front_ring __name##_front_ring_t; \
> +typedef struct __name##_back_ring __name##_back_ring_t
> +
> +/*
> + * Macros for manipulating rings.
> + *
> + * FRONT_RING_whatever works on the "front end" of a ring: here
> + * requests are pushed on to the ring and responses taken off it.
> + *
> + * BACK_RING_whatever works on the "back end" of a ring: here
> + * requests are taken off the ring and responses put on.
> + *
> + * N.B. these macros do NO INTERLOCKS OR FLOW CONTROL.
> + * This is OK in 1-for-1 request-response situations where the
> + * requestor (front end) never has more than RING_SIZE()-1
> + * outstanding requests.
> + */
> +
> +/* Initialising empty rings */
> +#define SHARED_RING_INIT(_s) do { \
> + (_s)->req_prod = (_s)->rsp_prod = 0; \
> + (_s)->req_event = (_s)->rsp_event = 1; \
> + (void)memset((_s)->pvt.pvt_pad, 0, sizeof((_s)->pvt.pvt_pad)); \
> + (void)memset((_s)->__pad, 0, sizeof((_s)->__pad)); \
> +} while(0)
> +
> +#define FRONT_RING_INIT(_r, _s, __size) do { \
> + (_r)->req_prod_pvt = 0; \
> + (_r)->rsp_cons = 0; \
> + (_r)->nr_ents = __RING_SIZE(_s, __size); \
> + (_r)->sring = (_s); \
> +} while (0)
> +
> +#define BACK_RING_INIT(_r, _s, __size) do { \
> + (_r)->rsp_prod_pvt = 0; \
> + (_r)->req_cons = 0; \
> + (_r)->nr_ents = __RING_SIZE(_s, __size); \
> + (_r)->sring = (_s); \
> +} while (0)
> +
> +/* How big is this ring? */
> +#define RING_SIZE(_r) \
> + ((_r)->nr_ents)
> +
> +/* Number of free requests (for use on front side only). */
> +#define RING_FREE_REQUESTS(_r) \
> + (RING_SIZE(_r) - ((_r)->req_prod_pvt - (_r)->rsp_cons))
> +
> +/* Test if there is an empty slot available on the front ring.
> + * (This is only meaningful from the front. )
> + */
> +#define RING_FULL(_r) \
> + (RING_FREE_REQUESTS(_r) == 0)
> +
> +/* Test if there are outstanding messages to be processed on a ring. */
> +#define RING_HAS_UNCONSUMED_RESPONSES(_r) \
> + ((_r)->sring->rsp_prod - (_r)->rsp_cons)
> +
> +#ifdef __GNUC__
> +#define RING_HAS_UNCONSUMED_REQUESTS(_r) ({ \
> + unsigned int req = (_r)->sring->req_prod - (_r)->req_cons; \
> + unsigned int rsp = RING_SIZE(_r) - \
> + ((_r)->req_cons - (_r)->rsp_prod_pvt); \
> + req < rsp ? req : rsp; \
> +})
> +#else
> +/* Same as above, but without the nice GCC ({ ... }) syntax. */
> +#define RING_HAS_UNCONSUMED_REQUESTS(_r) \
> + ((((_r)->sring->req_prod - (_r)->req_cons) < \
> + (RING_SIZE(_r) - ((_r)->req_cons - (_r)->rsp_prod_pvt))) ? \
> + ((_r)->sring->req_prod - (_r)->req_cons) : \
> + (RING_SIZE(_r) - ((_r)->req_cons - (_r)->rsp_prod_pvt)))
> +#endif
> +
> +/* Direct access to individual ring elements, by index. */
> +#define RING_GET_REQUEST(_r, _idx) \
> + (&((_r)->sring->ring[((_idx) & (RING_SIZE(_r) - 1))].req))
> +
> +/*
> + * Get a local copy of a request.
> + *
> + * Use this in preference to RING_GET_REQUEST() so all processing is
> + * done on a local copy that cannot be modified by the other end.
> + *
> + * Note that https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145 may cause this
> + * to be ineffective where _req is a struct which consists of only bitfields.
> + */
> +#define RING_COPY_REQUEST(_r, _idx, _req) do { \
> + /* Use volatile to force the copy into _req. */ \
> + *(_req) = *(volatile typeof(_req))RING_GET_REQUEST(_r, _idx); \
> +} while (0)
> +
> +#define RING_GET_RESPONSE(_r, _idx) \
> + (&((_r)->sring->ring[((_idx) & (RING_SIZE(_r) - 1))].rsp))
> +
> +/* Loop termination condition: Would the specified index overflow the ring? */
> +#define RING_REQUEST_CONS_OVERFLOW(_r, _cons) \
> + (((_cons) - (_r)->rsp_prod_pvt) >= RING_SIZE(_r))
> +
> +/* Ill-behaved frontend determination: Can there be this many requests? */
> +#define RING_REQUEST_PROD_OVERFLOW(_r, _prod) \
> + (((_prod) - (_r)->rsp_prod_pvt) > RING_SIZE(_r))
> +
> +#define RING_PUSH_REQUESTS(_r) do { \
> + xen_wmb(); /* back sees requests /before/ updated producer index */ \
> + (_r)->sring->req_prod = (_r)->req_prod_pvt; \
> +} while (0)
> +
> +#define RING_PUSH_RESPONSES(_r) do { \
> + xen_wmb(); /* front sees resps /before/ updated producer index */ \
> + (_r)->sring->rsp_prod = (_r)->rsp_prod_pvt; \
> +} while (0)
> +
> +/*
> + * Notification hold-off (req_event and rsp_event):
> + *
> + * When queueing requests or responses on a shared ring, it may not always be
> + * necessary to notify the remote end. For example, if requests are in flight
> + * in a backend, the front may be able to queue further requests without
> + * notifying the back (if the back checks for new requests when it queues
> + * responses).
> + *
> + * When enqueuing requests or responses:
> + *
> + * Use RING_PUSH_{REQUESTS,RESPONSES}_AND_CHECK_NOTIFY(). The second argument
> + * is a boolean return value. True indicates that the receiver requires an
> + * asynchronous notification.
> + *
> + * After dequeuing requests or responses (before sleeping the connection):
> + *
> + * Use RING_FINAL_CHECK_FOR_REQUESTS() or RING_FINAL_CHECK_FOR_RESPONSES().
> + * The second argument is a boolean return value. True indicates that there
> + * are pending messages on the ring (i.e., the connection should not be put
> + * to sleep).
> + *
> + * These macros will set the req_event/rsp_event field to trigger a
> + * notification on the very next message that is enqueued. If you want to
> + * create batches of work (i.e., only receive a notification after several
> + * messages have been enqueued) then you will need to create a customised
> + * version of the FINAL_CHECK macro in your own code, which sets the event
> + * field appropriately.
> + */
> +
> +#define RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(_r, _notify) do { \
> + RING_IDX __old = (_r)->sring->req_prod; \
> + RING_IDX __new = (_r)->req_prod_pvt; \
> + xen_wmb(); /* back sees requests /before/ updated producer index */ \
> + (_r)->sring->req_prod = __new; \
> + xen_mb(); /* back sees new requests /before/ we check req_event */ \
> + (_notify) = ((RING_IDX)(__new - (_r)->sring->req_event) < \
> + (RING_IDX)(__new - __old)); \
> +} while (0)
> +
> +#define RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(_r, _notify) do { \
> + RING_IDX __old = (_r)->sring->rsp_prod; \
> + RING_IDX __new = (_r)->rsp_prod_pvt; \
> + xen_wmb(); /* front sees resps /before/ updated producer index */ \
> + (_r)->sring->rsp_prod = __new; \
> + xen_mb(); /* front sees new resps /before/ we check rsp_event */ \
> + (_notify) = ((RING_IDX)(__new - (_r)->sring->rsp_event) < \
> + (RING_IDX)(__new - __old)); \
> +} while (0)
> +
> +#define RING_FINAL_CHECK_FOR_REQUESTS(_r, _work_to_do) do { \
> + (_work_to_do) = RING_HAS_UNCONSUMED_REQUESTS(_r); \
> + if (_work_to_do) break; \
> + (_r)->sring->req_event = (_r)->req_cons + 1; \
> + xen_mb(); \
> + (_work_to_do) = RING_HAS_UNCONSUMED_REQUESTS(_r); \
> +} while (0)
> +
> +#define RING_FINAL_CHECK_FOR_RESPONSES(_r, _work_to_do) do { \
> + (_work_to_do) = RING_HAS_UNCONSUMED_RESPONSES(_r); \
> + if (_work_to_do) break; \
> + (_r)->sring->rsp_event = (_r)->rsp_cons + 1; \
> + xen_mb(); \
> + (_work_to_do) = RING_HAS_UNCONSUMED_RESPONSES(_r); \
> +} while (0)
> +
> +
> +/*
> + * DEFINE_XEN_FLEX_RING_AND_INTF defines two monodirectional rings and
> + * functions to check if there is data on the ring, and to read and
> + * write to them.
> + *
> + * DEFINE_XEN_FLEX_RING is similar to DEFINE_XEN_FLEX_RING_AND_INTF, but
> + * does not define the indexes page. As different protocols can have
> + * extensions to the basic format, this macro allow them to define their
> + * own struct.
> + *
> + * XEN_FLEX_RING_SIZE
> + * Convenience macro to calculate the size of one of the two rings
> + * from the overall order.
> + *
> + * $NAME_mask
> + * Function to apply the size mask to an index, to reduce the index
> + * within the range [0-size].
> + *
> + * $NAME_read_packet
> + * Function to read data from the ring. The amount of data to read is
> + * specified by the "size" argument.
> + *
> + * $NAME_write_packet
> + * Function to write data to the ring. The amount of data to write is
> + * specified by the "size" argument.
> + *
> + * $NAME_get_ring_ptr
> + * Convenience function that returns a pointer to read/write to the
> + * ring at the right location.
> + *
> + * $NAME_data_intf
> + * Indexes page, shared between frontend and backend. It also
> + * contains the array of grant refs.
> + *
> + * $NAME_queued
> + * Function to calculate how many bytes are currently on the ring,
> + * ready to be read. It can also be used to calculate how much free
> + * space is currently on the ring (ring_size - $NAME_queued()).
> + */
> +#define XEN_FLEX_RING_SIZE(order) \
> + (1UL << (order + PAGE_SHIFT - 1))
> +
> +#define DEFINE_XEN_FLEX_RING_AND_INTF(name) \
> +struct name##_data_intf { \
> + RING_IDX in_cons, in_prod; \
> + \
> + uint8_t pad1[56]; \
> + \
> + RING_IDX out_cons, out_prod; \
> + \
> + uint8_t pad2[56]; \
> + \
> + RING_IDX ring_order; \
> + grant_ref_t ref[]; \
> +}; \
> +DEFINE_XEN_FLEX_RING(name);
> +
> +#define DEFINE_XEN_FLEX_RING(name) \
> +static inline RING_IDX name##_mask(RING_IDX idx, RING_IDX ring_size) \
> +{ \
> + return (idx & (ring_size - 1)); \
> +} \
> + \
> +static inline RING_IDX name##_mask_order(RING_IDX idx, RING_IDX ring_order) \
> +{ \
> + return (idx & (XEN_FLEX_RING_SIZE(ring_order) - 1)); \
> +} \
> + \
> +static inline unsigned char* name##_get_ring_ptr(unsigned char *buf, \
> + RING_IDX idx, \
> + RING_IDX ring_order) \
> +{ \
> + return buf + name##_mask_order(idx, ring_order); \
> +} \
> + \
> +static inline void name##_read_packet(const unsigned char *buf, \
> + RING_IDX masked_prod, RING_IDX *masked_cons, \
> + RING_IDX ring_size, void *opaque, size_t size) { \
> + if (*masked_cons < masked_prod || \
> + size <= ring_size - *masked_cons) { \
> + memcpy(opaque, buf + *masked_cons, size); \
> + } else { \
> + memcpy(opaque, buf + *masked_cons, ring_size - *masked_cons); \
> + memcpy((unsigned char *)opaque + ring_size - *masked_cons, buf, \
> + size - (ring_size - *masked_cons)); \
> + } \
> + *masked_cons = name##_mask(*masked_cons + size, ring_size); \
> +} \
> + \
> +static inline void name##_write_packet(unsigned char *buf, \
> + RING_IDX *masked_prod, RING_IDX masked_cons, \
> + RING_IDX ring_size, const void *opaque, size_t size) { \
> + if (*masked_prod < masked_cons || \
> + size <= ring_size - *masked_prod) { \
> + memcpy(buf + *masked_prod, opaque, size); \
> + } else { \
> + memcpy(buf + *masked_prod, opaque, ring_size - *masked_prod); \
> + memcpy(buf, (unsigned char *)opaque + (ring_size - *masked_prod), \
> + size - (ring_size - *masked_prod)); \
> + } \
> + *masked_prod = name##_mask(*masked_prod + size, ring_size); \
> +} \
> + \
> +struct name##_data { \
> + unsigned char *in; /* half of the allocation */ \
> + unsigned char *out; /* half of the allocation */ \
> +}; \
> + \
> + \
> +static inline RING_IDX name##_queued(RING_IDX prod, \
> + RING_IDX cons, RING_IDX ring_size) \
> +{ \
> + RING_IDX size; \
> + \
> + if (prod == cons) \
> + return 0; \
> + \
> + prod = name##_mask(prod, ring_size); \
> + cons = name##_mask(cons, ring_size); \
> + \
> + if (prod == cons) \
> + return ring_size; \
> + \
> + if (prod > cons) \
> + size = prod - cons; \
> + else \
> + size = ring_size - (cons - prod); \
> + return size; \
> +};
> +
> +#endif /* __XEN_PUBLIC_IO_RING_H__ */
> +
> +/*
> + * Local variables:
> + * mode: C
> + * c-file-style: "BSD"
> + * c-basic-offset: 4
> + * tab-width: 4
> + * indent-tabs-mode: nil
> + * End:
> + */
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_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [Qemu-devel] [PATCH v3 3/9] 9p: introduce a type for the 9p header
2017-03-16 20:01 ` Stefano Stabellini
@ 2017-03-17 11:16 ` Greg Kurz
-1 siblings, 0 replies; 40+ messages in thread
From: Greg Kurz @ 2017-03-17 11:16 UTC (permalink / raw)
To: Stefano Stabellini
Cc: qemu-devel, xen-devel, jgross, Stefano Stabellini,
anthony.perard, Aneesh Kumar K.V
[-- Attachment #1: Type: text/plain, Size: 1590 bytes --]
On Thu, 16 Mar 2017 13:01:52 -0700
Stefano Stabellini <sstabellini@kernel.org> wrote:
> Use the new type in virtio-9p-device.
>
> Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
> CC: anthony.perard@citrix.com
> CC: jgross@suse.com
> CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> CC: Greg Kurz <groug@kaod.org>
> ---
Reviewed-by: Greg Kurz <groug@kaod.org>
> hw/9pfs/9p.h | 6 ++++++
> hw/9pfs/virtio-9p-device.c | 6 +-----
> 2 files changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/hw/9pfs/9p.h b/hw/9pfs/9p.h
> index b7e8362..5312d8a 100644
> --- a/hw/9pfs/9p.h
> +++ b/hw/9pfs/9p.h
> @@ -119,6 +119,12 @@ static inline char *rpath(FsContext *ctx, const char *path)
> typedef struct V9fsPDU V9fsPDU;
> struct V9fsState;
>
> +typedef struct {
> + uint32_t size_le;
> + uint8_t id;
> + uint16_t tag_le;
> +} QEMU_PACKED P9MsgHeader;
> +
> struct V9fsPDU
> {
> uint32_t size;
> diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
> index 27a4a32..3782f43 100644
> --- a/hw/9pfs/virtio-9p-device.c
> +++ b/hw/9pfs/virtio-9p-device.c
> @@ -46,11 +46,7 @@ static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
> VirtQueueElement *elem;
>
> while ((pdu = pdu_alloc(s))) {
> - struct {
> - uint32_t size_le;
> - uint8_t id;
> - uint16_t tag_le;
> - } QEMU_PACKED out;
> + P9MsgHeader out;
>
> elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
> if (!elem) {
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^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH v3 3/9] 9p: introduce a type for the 9p header
@ 2017-03-17 11:16 ` Greg Kurz
0 siblings, 0 replies; 40+ messages in thread
From: Greg Kurz @ 2017-03-17 11:16 UTC (permalink / raw)
To: Stefano Stabellini
Cc: jgross, qemu-devel, Stefano Stabellini, Aneesh Kumar K.V,
anthony.perard, xen-devel
[-- Attachment #1.1: Type: text/plain, Size: 1590 bytes --]
On Thu, 16 Mar 2017 13:01:52 -0700
Stefano Stabellini <sstabellini@kernel.org> wrote:
> Use the new type in virtio-9p-device.
>
> Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
> CC: anthony.perard@citrix.com
> CC: jgross@suse.com
> CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> CC: Greg Kurz <groug@kaod.org>
> ---
Reviewed-by: Greg Kurz <groug@kaod.org>
> hw/9pfs/9p.h | 6 ++++++
> hw/9pfs/virtio-9p-device.c | 6 +-----
> 2 files changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/hw/9pfs/9p.h b/hw/9pfs/9p.h
> index b7e8362..5312d8a 100644
> --- a/hw/9pfs/9p.h
> +++ b/hw/9pfs/9p.h
> @@ -119,6 +119,12 @@ static inline char *rpath(FsContext *ctx, const char *path)
> typedef struct V9fsPDU V9fsPDU;
> struct V9fsState;
>
> +typedef struct {
> + uint32_t size_le;
> + uint8_t id;
> + uint16_t tag_le;
> +} QEMU_PACKED P9MsgHeader;
> +
> struct V9fsPDU
> {
> uint32_t size;
> diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
> index 27a4a32..3782f43 100644
> --- a/hw/9pfs/virtio-9p-device.c
> +++ b/hw/9pfs/virtio-9p-device.c
> @@ -46,11 +46,7 @@ static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
> VirtQueueElement *elem;
>
> while ((pdu = pdu_alloc(s))) {
> - struct {
> - uint32_t size_le;
> - uint8_t id;
> - uint16_t tag_le;
> - } QEMU_PACKED out;
> + P9MsgHeader out;
>
> elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
> if (!elem) {
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_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [Qemu-devel] [PATCH v3 5/9] xen/9pfs: connect to the frontend
2017-03-16 20:01 ` Stefano Stabellini
@ 2017-03-17 13:22 ` Greg Kurz
-1 siblings, 0 replies; 40+ messages in thread
From: Greg Kurz @ 2017-03-17 13:22 UTC (permalink / raw)
To: Stefano Stabellini
Cc: qemu-devel, xen-devel, jgross, Stefano Stabellini,
anthony.perard, Aneesh Kumar K.V
[-- Attachment #1: Type: text/plain, Size: 8691 bytes --]
On Thu, 16 Mar 2017 13:01:54 -0700
Stefano Stabellini <sstabellini@kernel.org> wrote:
> Write the limits of the backend to xenstore. Connect to the frontend.
> Upon connection, allocate the rings according to the protocol
> specification.
>
> Initialize a QEMUBH to schedule work upon receiving an event channel
> notification from the frontend.
>
> Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
> CC: anthony.perard@citrix.com
> CC: jgross@suse.com
> CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> CC: Greg Kurz <groug@kaod.org>
> ---
> hw/9pfs/xen-9p-backend.c | 182 ++++++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 181 insertions(+), 1 deletion(-)
>
> diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
> index 92bb805..3fd20ff 100644
> --- a/hw/9pfs/xen-9p-backend.c
> +++ b/hw/9pfs/xen-9p-backend.c
> @@ -23,8 +23,39 @@
> #define XEN_9PFS_RING_SIZE XEN_FLEX_RING_SIZE(XEN_9PFS_RING_ORDER)
> DEFINE_XEN_FLEX_RING_AND_INTF(xen_9pfs);
>
> +#define VERSIONS "1"
> +#define MAX_RINGS 8
> +#define MAX_RING_ORDER 8
> +
> +typedef struct Xen9pfsRing {
> + struct Xen9pfsDev *priv;
> +
> + int ref;
> + xenevtchn_handle *evtchndev;
> + int evtchn;
> + int local_port;
> + struct xen_9pfs_data_intf *intf;
> + unsigned char *data;
> + struct xen_9pfs_data ring;
> +
> + QEMUBH *bh;
> +
> + /* local copies, so that we can read/write PDU data directly from
> + * the ring */
> + RING_IDX out_cons, out_size, in_cons;
> + bool inprogress;
> +} Xen9pfsRing;
> +
> typedef struct Xen9pfsDev {
> struct XenDevice xendev; /* must be first */
> + V9fsState state;
> + char *path;
> + char *security_model;
> + char *tag;
> + char *id;
> +
> + int num_rings;
> + Xen9pfsRing *rings;
> } Xen9pfsDev;
>
> static ssize_t xen_9pfs_pdu_vmarshal(V9fsPDU *pdu,
> @@ -73,22 +104,171 @@ static int xen_9pfs_init(struct XenDevice *xendev)
> return 0;
> }
>
> +static void xen_9pfs_bh(void *opaque)
> +{
> +}
> +
> +static void xen_9pfs_evtchn_event(void *opaque)
> +{
> +}
> +
> static int xen_9pfs_free(struct XenDevice *xendev)
> {
> - return -1;
> + int i;
> + Xen9pfsDev *xen_9pdev = container_of(xendev, Xen9pfsDev, xendev);
> +
> + if (xen_9pdev->id != NULL) {
> + g_free(xen_9pdev->id);
> + }
> + if (xen_9pdev->tag != NULL) {
> + g_free(xen_9pdev->tag);
> + }
> + if (xen_9pdev->path != NULL) {
> + g_free(xen_9pdev->path);
> + }
> + if (xen_9pdev->security_model != NULL) {
> + g_free(xen_9pdev->security_model);
> + }
You don't need the if's since g_free(NULL) is legal.
> +
> + for (i = 0; i < xen_9pdev->num_rings; i++) {
> + if (xen_9pdev->rings[i].data != NULL) {
> + xengnttab_unmap(xen_9pdev->xendev.gnttabdev,
> + xen_9pdev->rings[i].data,
> + (1 << XEN_9PFS_RING_ORDER));
> + }
> + if (xen_9pdev->rings[i].intf != NULL) {
> + xengnttab_unmap(xen_9pdev->xendev.gnttabdev,
> + xen_9pdev->rings[i].intf,
> + 1);
> + }
> + if (xen_9pdev->rings[i].evtchndev > 0) {
> + qemu_set_fd_handler(xenevtchn_fd(xen_9pdev->rings[i].evtchndev),
> + NULL, NULL, NULL);
> + xenevtchn_unbind(xen_9pdev->rings[i].evtchndev,
> + xen_9pdev->rings[i].local_port);
> + }
> + if (xen_9pdev->rings[i].bh != NULL) {
> + qemu_bh_delete(xen_9pdev->rings[i].bh);
> + }
> + }
> + g_free(xen_9pdev->rings);
> + return 0;
> }
>
> static int xen_9pfs_connect(struct XenDevice *xendev)
> {
> + int i;
> + Xen9pfsDev *xen_9pdev = container_of(xendev, Xen9pfsDev, xendev);
> + V9fsState *s = &xen_9pdev->state;
> + QemuOpts *fsdev;
> +
> + if (xenstore_read_fe_int(&xen_9pdev->xendev, "num-rings",
> + &xen_9pdev->num_rings) == -1 ||
> + xen_9pdev->num_rings > MAX_RINGS || xen_9pdev->num_rings < 1) {
> + return -1;
> + }
> +
> + xen_9pdev->rings = g_malloc0(xen_9pdev->num_rings * sizeof(Xen9pfsRing));
> + for (i = 0; i < xen_9pdev->num_rings; i++) {
> + char *str;
> +
> + xen_9pdev->rings[i].priv = xen_9pdev;
> + xen_9pdev->rings[i].evtchn = -1;
> + xen_9pdev->rings[i].local_port = -1;
> +
> + str = g_strdup_printf("ring-ref%u", i);
> + if (xenstore_read_fe_int(&xen_9pdev->xendev, str,
> + &xen_9pdev->rings[i].ref) == -1) {
> + goto out;
> + }
> + g_free(str);
> + str = g_strdup_printf("event-channel-%u", i);
> + if (xenstore_read_fe_int(&xen_9pdev->xendev, str,
> + &xen_9pdev->rings[i].evtchn) == -1) {
> + goto out;
> + }
> + g_free(str);
> +
> + xen_9pdev->rings[i].intf = xengnttab_map_grant_ref(
> + xen_9pdev->xendev.gnttabdev,
> + xen_9pdev->xendev.dom,
> + xen_9pdev->rings[i].ref,
> + PROT_READ | PROT_WRITE);
> + if (!xen_9pdev->rings[i].intf) {
> + goto out;
> + }
> + xen_9pdev->rings[i].data = xengnttab_map_domain_grant_refs(
> + xen_9pdev->xendev.gnttabdev,
> + (1 << XEN_9PFS_RING_ORDER),
> + xen_9pdev->xendev.dom,
> + xen_9pdev->rings[i].intf->ref,
> + PROT_READ | PROT_WRITE);
> + if (!xen_9pdev->rings[i].data) {
> + goto out;
> + }
> + xen_9pdev->rings[i].ring.in = xen_9pdev->rings[i].data;
> + xen_9pdev->rings[i].ring.out = xen_9pdev->rings[i].data +
> + XEN_9PFS_RING_SIZE;
> +
> + xen_9pdev->rings[i].bh = qemu_bh_new(xen_9pfs_bh, &xen_9pdev->rings[i]);
> + xen_9pdev->rings[i].out_cons = 0;
> + xen_9pdev->rings[i].out_size = 0;
> + xen_9pdev->rings[i].inprogress = false;
> +
> +
> + xen_9pdev->rings[i].evtchndev = xenevtchn_open(NULL, 0);
> + if (xen_9pdev->rings[i].evtchndev == NULL) {
> + goto out;
> + }
> + fcntl(xenevtchn_fd(xen_9pdev->rings[i].evtchndev), F_SETFD, FD_CLOEXEC);
> + xen_9pdev->rings[i].local_port = xenevtchn_bind_interdomain
> + (xen_9pdev->rings[i].evtchndev,
> + xendev->dom,
> + xen_9pdev->rings[i].evtchn);
> + if (xen_9pdev->rings[i].local_port == -1) {
> + xen_pv_printf(xendev, 0,
> + "xenevtchn_bind_interdomain failed port=%d\n",
> + xen_9pdev->rings[i].evtchn);
> + goto out;
> + }
> + xen_pv_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port);
> + qemu_set_fd_handler(xenevtchn_fd(xen_9pdev->rings[i].evtchndev),
> + xen_9pfs_evtchn_event, NULL, &xen_9pdev->rings[i]);
> + }
> +
> + xen_9pdev->security_model = xenstore_read_be_str(xendev, "security_model");
> + xen_9pdev->path = xenstore_read_be_str(xendev, "path");
> + xen_9pdev->id = s->fsconf.fsdev_id =
> + g_strdup_printf("xen9p%d", xendev->dev);
> + xen_9pdev->tag = s->fsconf.tag = xenstore_read_fe_str(xendev, "tag");
> + v9fs_register_transport(s, &xen_9p_transport);
> + fsdev = qemu_opts_create(qemu_find_opts("fsdev"),
> + s->fsconf.tag,
> + 1, NULL);
> + qemu_opt_set(fsdev, "fsdriver", "local", NULL);
> + qemu_opt_set(fsdev, "path", xen_9pdev->path, NULL);
> + qemu_opt_set(fsdev, "security_model", xen_9pdev->security_model, NULL);
> + qemu_opts_set_id(fsdev, s->fsconf.fsdev_id);
> + qemu_fsdev_add(fsdev);
> + v9fs_device_realize_common(s, NULL);
> +
> return 0;
> +
> +out:
> + xen_9pfs_free(xendev);
> + return -1;
> }
>
> static void xen_9pfs_alloc(struct XenDevice *xendev)
> {
> + xenstore_write_be_str(xendev, "versions", VERSIONS);
> + xenstore_write_be_int(xendev, "max-rings", MAX_RINGS);
> + xenstore_write_be_int(xendev, "max-ring-page-order", MAX_RING_ORDER);
> }
>
> static void xen_9pfs_disconnect(struct XenDevice *xendev)
> {
> + /* Dynamic hotplug of PV filesystems at runtime is not supported. */
> }
>
> struct XenDevOps xen_9pfs_ops = {
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 181 bytes --]
^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH v3 5/9] xen/9pfs: connect to the frontend
@ 2017-03-17 13:22 ` Greg Kurz
0 siblings, 0 replies; 40+ messages in thread
From: Greg Kurz @ 2017-03-17 13:22 UTC (permalink / raw)
To: Stefano Stabellini
Cc: jgross, qemu-devel, Stefano Stabellini, Aneesh Kumar K.V,
anthony.perard, xen-devel
[-- Attachment #1.1: Type: text/plain, Size: 8691 bytes --]
On Thu, 16 Mar 2017 13:01:54 -0700
Stefano Stabellini <sstabellini@kernel.org> wrote:
> Write the limits of the backend to xenstore. Connect to the frontend.
> Upon connection, allocate the rings according to the protocol
> specification.
>
> Initialize a QEMUBH to schedule work upon receiving an event channel
> notification from the frontend.
>
> Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
> CC: anthony.perard@citrix.com
> CC: jgross@suse.com
> CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> CC: Greg Kurz <groug@kaod.org>
> ---
> hw/9pfs/xen-9p-backend.c | 182 ++++++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 181 insertions(+), 1 deletion(-)
>
> diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
> index 92bb805..3fd20ff 100644
> --- a/hw/9pfs/xen-9p-backend.c
> +++ b/hw/9pfs/xen-9p-backend.c
> @@ -23,8 +23,39 @@
> #define XEN_9PFS_RING_SIZE XEN_FLEX_RING_SIZE(XEN_9PFS_RING_ORDER)
> DEFINE_XEN_FLEX_RING_AND_INTF(xen_9pfs);
>
> +#define VERSIONS "1"
> +#define MAX_RINGS 8
> +#define MAX_RING_ORDER 8
> +
> +typedef struct Xen9pfsRing {
> + struct Xen9pfsDev *priv;
> +
> + int ref;
> + xenevtchn_handle *evtchndev;
> + int evtchn;
> + int local_port;
> + struct xen_9pfs_data_intf *intf;
> + unsigned char *data;
> + struct xen_9pfs_data ring;
> +
> + QEMUBH *bh;
> +
> + /* local copies, so that we can read/write PDU data directly from
> + * the ring */
> + RING_IDX out_cons, out_size, in_cons;
> + bool inprogress;
> +} Xen9pfsRing;
> +
> typedef struct Xen9pfsDev {
> struct XenDevice xendev; /* must be first */
> + V9fsState state;
> + char *path;
> + char *security_model;
> + char *tag;
> + char *id;
> +
> + int num_rings;
> + Xen9pfsRing *rings;
> } Xen9pfsDev;
>
> static ssize_t xen_9pfs_pdu_vmarshal(V9fsPDU *pdu,
> @@ -73,22 +104,171 @@ static int xen_9pfs_init(struct XenDevice *xendev)
> return 0;
> }
>
> +static void xen_9pfs_bh(void *opaque)
> +{
> +}
> +
> +static void xen_9pfs_evtchn_event(void *opaque)
> +{
> +}
> +
> static int xen_9pfs_free(struct XenDevice *xendev)
> {
> - return -1;
> + int i;
> + Xen9pfsDev *xen_9pdev = container_of(xendev, Xen9pfsDev, xendev);
> +
> + if (xen_9pdev->id != NULL) {
> + g_free(xen_9pdev->id);
> + }
> + if (xen_9pdev->tag != NULL) {
> + g_free(xen_9pdev->tag);
> + }
> + if (xen_9pdev->path != NULL) {
> + g_free(xen_9pdev->path);
> + }
> + if (xen_9pdev->security_model != NULL) {
> + g_free(xen_9pdev->security_model);
> + }
You don't need the if's since g_free(NULL) is legal.
> +
> + for (i = 0; i < xen_9pdev->num_rings; i++) {
> + if (xen_9pdev->rings[i].data != NULL) {
> + xengnttab_unmap(xen_9pdev->xendev.gnttabdev,
> + xen_9pdev->rings[i].data,
> + (1 << XEN_9PFS_RING_ORDER));
> + }
> + if (xen_9pdev->rings[i].intf != NULL) {
> + xengnttab_unmap(xen_9pdev->xendev.gnttabdev,
> + xen_9pdev->rings[i].intf,
> + 1);
> + }
> + if (xen_9pdev->rings[i].evtchndev > 0) {
> + qemu_set_fd_handler(xenevtchn_fd(xen_9pdev->rings[i].evtchndev),
> + NULL, NULL, NULL);
> + xenevtchn_unbind(xen_9pdev->rings[i].evtchndev,
> + xen_9pdev->rings[i].local_port);
> + }
> + if (xen_9pdev->rings[i].bh != NULL) {
> + qemu_bh_delete(xen_9pdev->rings[i].bh);
> + }
> + }
> + g_free(xen_9pdev->rings);
> + return 0;
> }
>
> static int xen_9pfs_connect(struct XenDevice *xendev)
> {
> + int i;
> + Xen9pfsDev *xen_9pdev = container_of(xendev, Xen9pfsDev, xendev);
> + V9fsState *s = &xen_9pdev->state;
> + QemuOpts *fsdev;
> +
> + if (xenstore_read_fe_int(&xen_9pdev->xendev, "num-rings",
> + &xen_9pdev->num_rings) == -1 ||
> + xen_9pdev->num_rings > MAX_RINGS || xen_9pdev->num_rings < 1) {
> + return -1;
> + }
> +
> + xen_9pdev->rings = g_malloc0(xen_9pdev->num_rings * sizeof(Xen9pfsRing));
> + for (i = 0; i < xen_9pdev->num_rings; i++) {
> + char *str;
> +
> + xen_9pdev->rings[i].priv = xen_9pdev;
> + xen_9pdev->rings[i].evtchn = -1;
> + xen_9pdev->rings[i].local_port = -1;
> +
> + str = g_strdup_printf("ring-ref%u", i);
> + if (xenstore_read_fe_int(&xen_9pdev->xendev, str,
> + &xen_9pdev->rings[i].ref) == -1) {
> + goto out;
> + }
> + g_free(str);
> + str = g_strdup_printf("event-channel-%u", i);
> + if (xenstore_read_fe_int(&xen_9pdev->xendev, str,
> + &xen_9pdev->rings[i].evtchn) == -1) {
> + goto out;
> + }
> + g_free(str);
> +
> + xen_9pdev->rings[i].intf = xengnttab_map_grant_ref(
> + xen_9pdev->xendev.gnttabdev,
> + xen_9pdev->xendev.dom,
> + xen_9pdev->rings[i].ref,
> + PROT_READ | PROT_WRITE);
> + if (!xen_9pdev->rings[i].intf) {
> + goto out;
> + }
> + xen_9pdev->rings[i].data = xengnttab_map_domain_grant_refs(
> + xen_9pdev->xendev.gnttabdev,
> + (1 << XEN_9PFS_RING_ORDER),
> + xen_9pdev->xendev.dom,
> + xen_9pdev->rings[i].intf->ref,
> + PROT_READ | PROT_WRITE);
> + if (!xen_9pdev->rings[i].data) {
> + goto out;
> + }
> + xen_9pdev->rings[i].ring.in = xen_9pdev->rings[i].data;
> + xen_9pdev->rings[i].ring.out = xen_9pdev->rings[i].data +
> + XEN_9PFS_RING_SIZE;
> +
> + xen_9pdev->rings[i].bh = qemu_bh_new(xen_9pfs_bh, &xen_9pdev->rings[i]);
> + xen_9pdev->rings[i].out_cons = 0;
> + xen_9pdev->rings[i].out_size = 0;
> + xen_9pdev->rings[i].inprogress = false;
> +
> +
> + xen_9pdev->rings[i].evtchndev = xenevtchn_open(NULL, 0);
> + if (xen_9pdev->rings[i].evtchndev == NULL) {
> + goto out;
> + }
> + fcntl(xenevtchn_fd(xen_9pdev->rings[i].evtchndev), F_SETFD, FD_CLOEXEC);
> + xen_9pdev->rings[i].local_port = xenevtchn_bind_interdomain
> + (xen_9pdev->rings[i].evtchndev,
> + xendev->dom,
> + xen_9pdev->rings[i].evtchn);
> + if (xen_9pdev->rings[i].local_port == -1) {
> + xen_pv_printf(xendev, 0,
> + "xenevtchn_bind_interdomain failed port=%d\n",
> + xen_9pdev->rings[i].evtchn);
> + goto out;
> + }
> + xen_pv_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port);
> + qemu_set_fd_handler(xenevtchn_fd(xen_9pdev->rings[i].evtchndev),
> + xen_9pfs_evtchn_event, NULL, &xen_9pdev->rings[i]);
> + }
> +
> + xen_9pdev->security_model = xenstore_read_be_str(xendev, "security_model");
> + xen_9pdev->path = xenstore_read_be_str(xendev, "path");
> + xen_9pdev->id = s->fsconf.fsdev_id =
> + g_strdup_printf("xen9p%d", xendev->dev);
> + xen_9pdev->tag = s->fsconf.tag = xenstore_read_fe_str(xendev, "tag");
> + v9fs_register_transport(s, &xen_9p_transport);
> + fsdev = qemu_opts_create(qemu_find_opts("fsdev"),
> + s->fsconf.tag,
> + 1, NULL);
> + qemu_opt_set(fsdev, "fsdriver", "local", NULL);
> + qemu_opt_set(fsdev, "path", xen_9pdev->path, NULL);
> + qemu_opt_set(fsdev, "security_model", xen_9pdev->security_model, NULL);
> + qemu_opts_set_id(fsdev, s->fsconf.fsdev_id);
> + qemu_fsdev_add(fsdev);
> + v9fs_device_realize_common(s, NULL);
> +
> return 0;
> +
> +out:
> + xen_9pfs_free(xendev);
> + return -1;
> }
>
> static void xen_9pfs_alloc(struct XenDevice *xendev)
> {
> + xenstore_write_be_str(xendev, "versions", VERSIONS);
> + xenstore_write_be_int(xendev, "max-rings", MAX_RINGS);
> + xenstore_write_be_int(xendev, "max-ring-page-order", MAX_RING_ORDER);
> }
>
> static void xen_9pfs_disconnect(struct XenDevice *xendev)
> {
> + /* Dynamic hotplug of PV filesystems at runtime is not supported. */
> }
>
> struct XenDevOps xen_9pfs_ops = {
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_______________________________________________
Xen-devel mailing list
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^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [Qemu-devel] [PATCH v3 7/9] xen/9pfs: implement in/out_iov_from_pdu and vmarshal/vunmarshal
2017-03-16 20:01 ` Stefano Stabellini
@ 2017-03-17 13:27 ` Greg Kurz
-1 siblings, 0 replies; 40+ messages in thread
From: Greg Kurz @ 2017-03-17 13:27 UTC (permalink / raw)
To: Stefano Stabellini
Cc: qemu-devel, xen-devel, jgross, Stefano Stabellini,
anthony.perard, Aneesh Kumar K.V
[-- Attachment #1: Type: text/plain, Size: 5695 bytes --]
On Thu, 16 Mar 2017 13:01:56 -0700
Stefano Stabellini <sstabellini@kernel.org> wrote:
> Implement xen_9pfs_init_in/out_iov_from_pdu and
> xen_9pfs_pdu_vmarshal/vunmarshall by creating new sg pointing to the
> data on the ring.
>
> This is safe as we only handle one request per ring at any given time.
>
> Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
> CC: anthony.perard@citrix.com
> CC: jgross@suse.com
> CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> CC: Greg Kurz <groug@kaod.org>
> ---
> hw/9pfs/xen-9p-backend.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 90 insertions(+), 2 deletions(-)
>
> diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
> index f757591..0a1eb34 100644
> --- a/hw/9pfs/xen-9p-backend.c
> +++ b/hw/9pfs/xen-9p-backend.c
> @@ -58,12 +58,78 @@ typedef struct Xen9pfsDev {
> Xen9pfsRing *rings;
> } Xen9pfsDev;
>
> +static void xen_9pfs_in_sg(Xen9pfsRing *ring,
> + struct iovec *in_sg,
> + int *num,
> + uint32_t idx,
> + uint32_t size)
> +{
> + RING_IDX cons, prod, masked_prod, masked_cons;
> +
> + cons = ring->intf->in_cons;
> + prod = ring->intf->in_prod;
> + xen_rmb();
> + masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE);
> + masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
> +
> + if (masked_prod < masked_cons) {
> + in_sg[0].iov_base = ring->ring.in + masked_prod;
> + in_sg[0].iov_len = masked_cons - masked_prod;
> + *num = 1;
> + } else {
> + in_sg[0].iov_base = ring->ring.in + masked_prod;
> + in_sg[0].iov_len = XEN_9PFS_RING_SIZE - masked_prod;
> + in_sg[1].iov_base = ring->ring.in;
> + in_sg[1].iov_len = masked_cons;
> + *num = 2;
> + }
> +}
> +
> +static void xen_9pfs_out_sg(Xen9pfsRing *ring,
> + struct iovec *out_sg,
> + int *num,
> + uint32_t idx)
> +{
> + RING_IDX cons, prod, masked_prod, masked_cons;
> +
> + cons = ring->intf->out_cons;
> + prod = ring->intf->out_prod;
> + xen_rmb();
> + masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE);
> + masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
> +
> + if (masked_cons < masked_prod) {
> + out_sg[0].iov_base = ring->ring.out + masked_cons;
> + out_sg[0].iov_len = ring->out_size;
> + *num = 1;
> + } else {
> + if (ring->out_size > (XEN_9PFS_RING_SIZE - masked_cons)) {
> + out_sg[0].iov_base = ring->ring.out + masked_cons;
> + out_sg[0].iov_len = XEN_9PFS_RING_SIZE - masked_cons;
> + out_sg[1].iov_base = ring->ring.out;
> + out_sg[1].iov_len = ring->out_size -
> + (XEN_9PFS_RING_SIZE - masked_cons);
> + *num = 2;
> + } else {
> + out_sg[0].iov_base = ring->ring.out + masked_cons;
> + out_sg[0].iov_len = ring->out_size;
> + *num = 1;
> + }
> + }
> +}
> +
> static ssize_t xen_9pfs_pdu_vmarshal(V9fsPDU *pdu,
> size_t offset,
> const char *fmt,
> va_list ap)
> {
> - return 0;
> + Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
> + struct iovec in_sg[2];
> + int num;
> +
> + xen_9pfs_in_sg(&xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings],
> + in_sg, &num, pdu->idx, ROUND_UP(offset + 128, 512));
> + return v9fs_iov_vmarshal(in_sg, num, offset, 0, fmt, ap);
> }
>
> static ssize_t xen_9pfs_pdu_vunmarshal(V9fsPDU *pdu,
> @@ -71,13 +137,27 @@ static ssize_t xen_9pfs_pdu_vunmarshal(V9fsPDU *pdu,
> const char *fmt,
> va_list ap)
> {
> - return 0;
> + Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
> + struct iovec out_sg[2];
> + int num;
> +
> + xen_9pfs_out_sg(&xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings],
> + out_sg, &num, pdu->idx);
> + return v9fs_iov_vunmarshal(out_sg, num, offset, 0, fmt, ap);
> }
>
> static void xen_9pfs_init_out_iov_from_pdu(V9fsPDU *pdu,
> struct iovec **piov,
> unsigned int *pniov)
> {
> + Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
> + Xen9pfsRing *ring = &xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings];
> + struct iovec *sg = g_malloc0(sizeof(*sg) * 2);
I had overlooked in v2, sorry for that. Where does *sg gets freed ?
> + int num;
> +
> + xen_9pfs_out_sg(ring, sg, &num, pdu->idx);
> + *piov = sg;
> + *pniov = num;
> }
>
> static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu,
> @@ -85,6 +165,14 @@ static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu,
> unsigned int *pniov,
> size_t size)
> {
> + Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
> + Xen9pfsRing *ring = &xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings];
> + struct iovec *sg = g_malloc0(sizeof(*sg) * 2);
Same here.
> + int num;
> +
> + xen_9pfs_in_sg(ring, sg, &num, pdu->idx, size);
> + *piov = sg;
> + *pniov = num;
> }
>
> static void xen_9pfs_push_and_notify(V9fsPDU *pdu)
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^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH v3 7/9] xen/9pfs: implement in/out_iov_from_pdu and vmarshal/vunmarshal
@ 2017-03-17 13:27 ` Greg Kurz
0 siblings, 0 replies; 40+ messages in thread
From: Greg Kurz @ 2017-03-17 13:27 UTC (permalink / raw)
To: Stefano Stabellini
Cc: jgross, qemu-devel, Stefano Stabellini, Aneesh Kumar K.V,
anthony.perard, xen-devel
[-- Attachment #1.1: Type: text/plain, Size: 5695 bytes --]
On Thu, 16 Mar 2017 13:01:56 -0700
Stefano Stabellini <sstabellini@kernel.org> wrote:
> Implement xen_9pfs_init_in/out_iov_from_pdu and
> xen_9pfs_pdu_vmarshal/vunmarshall by creating new sg pointing to the
> data on the ring.
>
> This is safe as we only handle one request per ring at any given time.
>
> Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
> CC: anthony.perard@citrix.com
> CC: jgross@suse.com
> CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> CC: Greg Kurz <groug@kaod.org>
> ---
> hw/9pfs/xen-9p-backend.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 90 insertions(+), 2 deletions(-)
>
> diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
> index f757591..0a1eb34 100644
> --- a/hw/9pfs/xen-9p-backend.c
> +++ b/hw/9pfs/xen-9p-backend.c
> @@ -58,12 +58,78 @@ typedef struct Xen9pfsDev {
> Xen9pfsRing *rings;
> } Xen9pfsDev;
>
> +static void xen_9pfs_in_sg(Xen9pfsRing *ring,
> + struct iovec *in_sg,
> + int *num,
> + uint32_t idx,
> + uint32_t size)
> +{
> + RING_IDX cons, prod, masked_prod, masked_cons;
> +
> + cons = ring->intf->in_cons;
> + prod = ring->intf->in_prod;
> + xen_rmb();
> + masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE);
> + masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
> +
> + if (masked_prod < masked_cons) {
> + in_sg[0].iov_base = ring->ring.in + masked_prod;
> + in_sg[0].iov_len = masked_cons - masked_prod;
> + *num = 1;
> + } else {
> + in_sg[0].iov_base = ring->ring.in + masked_prod;
> + in_sg[0].iov_len = XEN_9PFS_RING_SIZE - masked_prod;
> + in_sg[1].iov_base = ring->ring.in;
> + in_sg[1].iov_len = masked_cons;
> + *num = 2;
> + }
> +}
> +
> +static void xen_9pfs_out_sg(Xen9pfsRing *ring,
> + struct iovec *out_sg,
> + int *num,
> + uint32_t idx)
> +{
> + RING_IDX cons, prod, masked_prod, masked_cons;
> +
> + cons = ring->intf->out_cons;
> + prod = ring->intf->out_prod;
> + xen_rmb();
> + masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE);
> + masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
> +
> + if (masked_cons < masked_prod) {
> + out_sg[0].iov_base = ring->ring.out + masked_cons;
> + out_sg[0].iov_len = ring->out_size;
> + *num = 1;
> + } else {
> + if (ring->out_size > (XEN_9PFS_RING_SIZE - masked_cons)) {
> + out_sg[0].iov_base = ring->ring.out + masked_cons;
> + out_sg[0].iov_len = XEN_9PFS_RING_SIZE - masked_cons;
> + out_sg[1].iov_base = ring->ring.out;
> + out_sg[1].iov_len = ring->out_size -
> + (XEN_9PFS_RING_SIZE - masked_cons);
> + *num = 2;
> + } else {
> + out_sg[0].iov_base = ring->ring.out + masked_cons;
> + out_sg[0].iov_len = ring->out_size;
> + *num = 1;
> + }
> + }
> +}
> +
> static ssize_t xen_9pfs_pdu_vmarshal(V9fsPDU *pdu,
> size_t offset,
> const char *fmt,
> va_list ap)
> {
> - return 0;
> + Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
> + struct iovec in_sg[2];
> + int num;
> +
> + xen_9pfs_in_sg(&xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings],
> + in_sg, &num, pdu->idx, ROUND_UP(offset + 128, 512));
> + return v9fs_iov_vmarshal(in_sg, num, offset, 0, fmt, ap);
> }
>
> static ssize_t xen_9pfs_pdu_vunmarshal(V9fsPDU *pdu,
> @@ -71,13 +137,27 @@ static ssize_t xen_9pfs_pdu_vunmarshal(V9fsPDU *pdu,
> const char *fmt,
> va_list ap)
> {
> - return 0;
> + Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
> + struct iovec out_sg[2];
> + int num;
> +
> + xen_9pfs_out_sg(&xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings],
> + out_sg, &num, pdu->idx);
> + return v9fs_iov_vunmarshal(out_sg, num, offset, 0, fmt, ap);
> }
>
> static void xen_9pfs_init_out_iov_from_pdu(V9fsPDU *pdu,
> struct iovec **piov,
> unsigned int *pniov)
> {
> + Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
> + Xen9pfsRing *ring = &xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings];
> + struct iovec *sg = g_malloc0(sizeof(*sg) * 2);
I had overlooked in v2, sorry for that. Where does *sg gets freed ?
> + int num;
> +
> + xen_9pfs_out_sg(ring, sg, &num, pdu->idx);
> + *piov = sg;
> + *pniov = num;
> }
>
> static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu,
> @@ -85,6 +165,14 @@ static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu,
> unsigned int *pniov,
> size_t size)
> {
> + Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
> + Xen9pfsRing *ring = &xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings];
> + struct iovec *sg = g_malloc0(sizeof(*sg) * 2);
Same here.
> + int num;
> +
> + xen_9pfs_in_sg(ring, sg, &num, pdu->idx, size);
> + *piov = sg;
> + *pniov = num;
> }
>
> static void xen_9pfs_push_and_notify(V9fsPDU *pdu)
[-- Attachment #1.2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 181 bytes --]
[-- Attachment #2: Type: text/plain, Size: 127 bytes --]
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [Qemu-devel] [PATCH v3 1/9] xen: do not build backends for targets that do not support xen
2017-03-17 11:10 ` Paolo Bonzini
@ 2017-03-17 17:34 ` Stefano Stabellini
-1 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-17 17:34 UTC (permalink / raw)
To: Paolo Bonzini
Cc: Stefano Stabellini, qemu-devel, xen-devel, jgross, groug,
Stefano Stabellini, peter.maydell, rth, stefanha
On Fri, 17 Mar 2017, Paolo Bonzini wrote:
> On 16/03/2017 21:01, Stefano Stabellini wrote:
> > Change Makefile.objs to use CONFIG_XEN instead of CONFIG_XEN_BACKEND, so
> > that the Xen backends are only built for targets that support Xen.
> >
> > Set CONFIG_XEN in the toplevel Makefile to ensure that files that are
> > built only once pick up Xen support properly.
> >
> > Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
> > CC: groug@kaod.org
> > CC: pbonzini@redhat.com
> > CC: peter.maydell@linaro.org
> > CC: rth@twiddle.net
> > CC: stefanha@redhat.com
> > ---
> > Makefile | 1 +
> > hw/block/Makefile.objs | 2 +-
> > hw/char/Makefile.objs | 2 +-
> > hw/display/Makefile.objs | 2 +-
> > hw/net/Makefile.objs | 2 +-
> > hw/usb/Makefile.objs | 2 +-
> > hw/xen/Makefile.objs | 2 +-
> > 7 files changed, 7 insertions(+), 6 deletions(-)
> >
> > diff --git a/Makefile b/Makefile
> > index 1c4c04f..b246138 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -26,6 +26,7 @@ endif
> >
> > CONFIG_SOFTMMU := $(if $(filter %-softmmu,$(TARGET_DIRS)),y)
> > CONFIG_USER_ONLY := $(if $(filter %-user,$(TARGET_DIRS)),y)
> > +CONFIG_XEN := $(CONFIG_XEN_BACKEND)
> > CONFIG_ALL=y
> > -include config-all-devices.mak
> > -include config-all-disas.mak
> > diff --git a/hw/block/Makefile.objs b/hw/block/Makefile.objs
> > index d4c3ab7..e0ed980 100644
> > --- a/hw/block/Makefile.objs
> > +++ b/hw/block/Makefile.objs
> > @@ -4,7 +4,7 @@ common-obj-$(CONFIG_SSI_M25P80) += m25p80.o
> > common-obj-$(CONFIG_NAND) += nand.o
> > common-obj-$(CONFIG_PFLASH_CFI01) += pflash_cfi01.o
> > common-obj-$(CONFIG_PFLASH_CFI02) += pflash_cfi02.o
> > -common-obj-$(CONFIG_XEN_BACKEND) += xen_disk.o
> > +common-obj-$(CONFIG_XEN) += xen_disk.o
> > common-obj-$(CONFIG_ECC) += ecc.o
> > common-obj-$(CONFIG_ONENAND) += onenand.o
> > common-obj-$(CONFIG_NVME_PCI) += nvme.o
> > diff --git a/hw/char/Makefile.objs b/hw/char/Makefile.objs
> > index 6ea76fe..725fdc4 100644
> > --- a/hw/char/Makefile.objs
> > +++ b/hw/char/Makefile.objs
> > @@ -7,7 +7,7 @@ common-obj-$(CONFIG_SERIAL_ISA) += serial-isa.o
> > common-obj-$(CONFIG_SERIAL_PCI) += serial-pci.o
> > common-obj-$(CONFIG_VIRTIO) += virtio-console.o
> > common-obj-$(CONFIG_XILINX) += xilinx_uartlite.o
> > -common-obj-$(CONFIG_XEN_BACKEND) += xen_console.o
> > +common-obj-$(CONFIG_XEN) += xen_console.o
> > common-obj-$(CONFIG_CADENCE) += cadence_uart.o
> >
> > obj-$(CONFIG_EXYNOS4) += exynos4210_uart.o
> > diff --git a/hw/display/Makefile.objs b/hw/display/Makefile.objs
> > index 063889b..3d02e8b 100644
> > --- a/hw/display/Makefile.objs
> > +++ b/hw/display/Makefile.objs
> > @@ -5,7 +5,7 @@ common-obj-$(CONFIG_JAZZ_LED) += jazz_led.o
> > common-obj-$(CONFIG_PL110) += pl110.o
> > common-obj-$(CONFIG_SSD0303) += ssd0303.o
> > common-obj-$(CONFIG_SSD0323) += ssd0323.o
> > -common-obj-$(CONFIG_XEN_BACKEND) += xenfb.o
> > +common-obj-$(CONFIG_XEN) += xenfb.o
> >
> > common-obj-$(CONFIG_VGA_PCI) += vga-pci.o
> > common-obj-$(CONFIG_VGA_ISA) += vga-isa.o
> > diff --git a/hw/net/Makefile.objs b/hw/net/Makefile.objs
> > index 610ed3e..6a95d92 100644
> > --- a/hw/net/Makefile.objs
> > +++ b/hw/net/Makefile.objs
> > @@ -1,5 +1,5 @@
> > common-obj-$(CONFIG_DP8393X) += dp8393x.o
> > -common-obj-$(CONFIG_XEN_BACKEND) += xen_nic.o
> > +common-obj-$(CONFIG_XEN) += xen_nic.o
> >
> > # PCI network cards
> > common-obj-$(CONFIG_NE2000_PCI) += ne2000.o
> > diff --git a/hw/usb/Makefile.objs b/hw/usb/Makefile.objs
> > index 98b5c9d..5958be8 100644
> > --- a/hw/usb/Makefile.objs
> > +++ b/hw/usb/Makefile.objs
> > @@ -40,5 +40,5 @@ common-obj-$(CONFIG_USB_REDIR) += redirect.o quirks.o
> > common-obj-y += $(patsubst %,host-%.o,$(HOST_USB))
> >
> > ifeq ($(CONFIG_USB_LIBUSB),y)
> > -common-obj-$(CONFIG_XEN_BACKEND) += xen-usb.o
> > +common-obj-$(CONFIG_XEN) += xen-usb.o
> > endif
> > diff --git a/hw/xen/Makefile.objs b/hw/xen/Makefile.objs
> > index 591cdc2..4be3ec9 100644
> > --- a/hw/xen/Makefile.objs
> > +++ b/hw/xen/Makefile.objs
> > @@ -1,5 +1,5 @@
> > # xen backend driver support
> > -common-obj-$(CONFIG_XEN_BACKEND) += xen_backend.o xen_devconfig.o xen_pvdev.o
> > +common-obj-$(CONFIG_XEN) += xen_backend.o xen_devconfig.o xen_pvdev.o
> >
> > obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen-host-pci-device.o
> > obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pt.o xen_pt_config_init.o xen_pt_graphics.o xen_pt_msi.o
> >
>
> I'm queuing this for 2.9 as a bugfix, adding Xen things to various
> softcore emulators makes no sense.
Thank you, and I agree!
^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH v3 1/9] xen: do not build backends for targets that do not support xen
@ 2017-03-17 17:34 ` Stefano Stabellini
0 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-17 17:34 UTC (permalink / raw)
To: Paolo Bonzini
Cc: jgross, peter.maydell, Stefano Stabellini, qemu-devel, groug,
Stefano Stabellini, stefanha, xen-devel, rth
On Fri, 17 Mar 2017, Paolo Bonzini wrote:
> On 16/03/2017 21:01, Stefano Stabellini wrote:
> > Change Makefile.objs to use CONFIG_XEN instead of CONFIG_XEN_BACKEND, so
> > that the Xen backends are only built for targets that support Xen.
> >
> > Set CONFIG_XEN in the toplevel Makefile to ensure that files that are
> > built only once pick up Xen support properly.
> >
> > Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
> > CC: groug@kaod.org
> > CC: pbonzini@redhat.com
> > CC: peter.maydell@linaro.org
> > CC: rth@twiddle.net
> > CC: stefanha@redhat.com
> > ---
> > Makefile | 1 +
> > hw/block/Makefile.objs | 2 +-
> > hw/char/Makefile.objs | 2 +-
> > hw/display/Makefile.objs | 2 +-
> > hw/net/Makefile.objs | 2 +-
> > hw/usb/Makefile.objs | 2 +-
> > hw/xen/Makefile.objs | 2 +-
> > 7 files changed, 7 insertions(+), 6 deletions(-)
> >
> > diff --git a/Makefile b/Makefile
> > index 1c4c04f..b246138 100644
> > --- a/Makefile
> > +++ b/Makefile
> > @@ -26,6 +26,7 @@ endif
> >
> > CONFIG_SOFTMMU := $(if $(filter %-softmmu,$(TARGET_DIRS)),y)
> > CONFIG_USER_ONLY := $(if $(filter %-user,$(TARGET_DIRS)),y)
> > +CONFIG_XEN := $(CONFIG_XEN_BACKEND)
> > CONFIG_ALL=y
> > -include config-all-devices.mak
> > -include config-all-disas.mak
> > diff --git a/hw/block/Makefile.objs b/hw/block/Makefile.objs
> > index d4c3ab7..e0ed980 100644
> > --- a/hw/block/Makefile.objs
> > +++ b/hw/block/Makefile.objs
> > @@ -4,7 +4,7 @@ common-obj-$(CONFIG_SSI_M25P80) += m25p80.o
> > common-obj-$(CONFIG_NAND) += nand.o
> > common-obj-$(CONFIG_PFLASH_CFI01) += pflash_cfi01.o
> > common-obj-$(CONFIG_PFLASH_CFI02) += pflash_cfi02.o
> > -common-obj-$(CONFIG_XEN_BACKEND) += xen_disk.o
> > +common-obj-$(CONFIG_XEN) += xen_disk.o
> > common-obj-$(CONFIG_ECC) += ecc.o
> > common-obj-$(CONFIG_ONENAND) += onenand.o
> > common-obj-$(CONFIG_NVME_PCI) += nvme.o
> > diff --git a/hw/char/Makefile.objs b/hw/char/Makefile.objs
> > index 6ea76fe..725fdc4 100644
> > --- a/hw/char/Makefile.objs
> > +++ b/hw/char/Makefile.objs
> > @@ -7,7 +7,7 @@ common-obj-$(CONFIG_SERIAL_ISA) += serial-isa.o
> > common-obj-$(CONFIG_SERIAL_PCI) += serial-pci.o
> > common-obj-$(CONFIG_VIRTIO) += virtio-console.o
> > common-obj-$(CONFIG_XILINX) += xilinx_uartlite.o
> > -common-obj-$(CONFIG_XEN_BACKEND) += xen_console.o
> > +common-obj-$(CONFIG_XEN) += xen_console.o
> > common-obj-$(CONFIG_CADENCE) += cadence_uart.o
> >
> > obj-$(CONFIG_EXYNOS4) += exynos4210_uart.o
> > diff --git a/hw/display/Makefile.objs b/hw/display/Makefile.objs
> > index 063889b..3d02e8b 100644
> > --- a/hw/display/Makefile.objs
> > +++ b/hw/display/Makefile.objs
> > @@ -5,7 +5,7 @@ common-obj-$(CONFIG_JAZZ_LED) += jazz_led.o
> > common-obj-$(CONFIG_PL110) += pl110.o
> > common-obj-$(CONFIG_SSD0303) += ssd0303.o
> > common-obj-$(CONFIG_SSD0323) += ssd0323.o
> > -common-obj-$(CONFIG_XEN_BACKEND) += xenfb.o
> > +common-obj-$(CONFIG_XEN) += xenfb.o
> >
> > common-obj-$(CONFIG_VGA_PCI) += vga-pci.o
> > common-obj-$(CONFIG_VGA_ISA) += vga-isa.o
> > diff --git a/hw/net/Makefile.objs b/hw/net/Makefile.objs
> > index 610ed3e..6a95d92 100644
> > --- a/hw/net/Makefile.objs
> > +++ b/hw/net/Makefile.objs
> > @@ -1,5 +1,5 @@
> > common-obj-$(CONFIG_DP8393X) += dp8393x.o
> > -common-obj-$(CONFIG_XEN_BACKEND) += xen_nic.o
> > +common-obj-$(CONFIG_XEN) += xen_nic.o
> >
> > # PCI network cards
> > common-obj-$(CONFIG_NE2000_PCI) += ne2000.o
> > diff --git a/hw/usb/Makefile.objs b/hw/usb/Makefile.objs
> > index 98b5c9d..5958be8 100644
> > --- a/hw/usb/Makefile.objs
> > +++ b/hw/usb/Makefile.objs
> > @@ -40,5 +40,5 @@ common-obj-$(CONFIG_USB_REDIR) += redirect.o quirks.o
> > common-obj-y += $(patsubst %,host-%.o,$(HOST_USB))
> >
> > ifeq ($(CONFIG_USB_LIBUSB),y)
> > -common-obj-$(CONFIG_XEN_BACKEND) += xen-usb.o
> > +common-obj-$(CONFIG_XEN) += xen-usb.o
> > endif
> > diff --git a/hw/xen/Makefile.objs b/hw/xen/Makefile.objs
> > index 591cdc2..4be3ec9 100644
> > --- a/hw/xen/Makefile.objs
> > +++ b/hw/xen/Makefile.objs
> > @@ -1,5 +1,5 @@
> > # xen backend driver support
> > -common-obj-$(CONFIG_XEN_BACKEND) += xen_backend.o xen_devconfig.o xen_pvdev.o
> > +common-obj-$(CONFIG_XEN) += xen_backend.o xen_devconfig.o xen_pvdev.o
> >
> > obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen-host-pci-device.o
> > obj-$(CONFIG_XEN_PCI_PASSTHROUGH) += xen_pt.o xen_pt_config_init.o xen_pt_graphics.o xen_pt_msi.o
> >
>
> I'm queuing this for 2.9 as a bugfix, adding Xen things to various
> softcore emulators makes no sense.
Thank you, and I agree!
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [Qemu-devel] [PATCH v3 5/9] xen/9pfs: connect to the frontend
2017-03-17 13:22 ` Greg Kurz
@ 2017-03-17 17:40 ` Stefano Stabellini
-1 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-17 17:40 UTC (permalink / raw)
To: Greg Kurz
Cc: Stefano Stabellini, qemu-devel, xen-devel, jgross,
Stefano Stabellini, anthony.perard, Aneesh Kumar K.V
On Fri, 17 Mar 2017, Greg Kurz wrote:
> On Thu, 16 Mar 2017 13:01:54 -0700
> Stefano Stabellini <sstabellini@kernel.org> wrote:
>
> > Write the limits of the backend to xenstore. Connect to the frontend.
> > Upon connection, allocate the rings according to the protocol
> > specification.
> >
> > Initialize a QEMUBH to schedule work upon receiving an event channel
> > notification from the frontend.
> >
> > Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
> > CC: anthony.perard@citrix.com
> > CC: jgross@suse.com
> > CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> > CC: Greg Kurz <groug@kaod.org>
> > ---
> > hw/9pfs/xen-9p-backend.c | 182 ++++++++++++++++++++++++++++++++++++++++++++++-
> > 1 file changed, 181 insertions(+), 1 deletion(-)
> >
> > diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
> > index 92bb805..3fd20ff 100644
> > --- a/hw/9pfs/xen-9p-backend.c
> > +++ b/hw/9pfs/xen-9p-backend.c
> > @@ -23,8 +23,39 @@
> > #define XEN_9PFS_RING_SIZE XEN_FLEX_RING_SIZE(XEN_9PFS_RING_ORDER)
> > DEFINE_XEN_FLEX_RING_AND_INTF(xen_9pfs);
> >
> > +#define VERSIONS "1"
> > +#define MAX_RINGS 8
> > +#define MAX_RING_ORDER 8
> > +
> > +typedef struct Xen9pfsRing {
> > + struct Xen9pfsDev *priv;
> > +
> > + int ref;
> > + xenevtchn_handle *evtchndev;
> > + int evtchn;
> > + int local_port;
> > + struct xen_9pfs_data_intf *intf;
> > + unsigned char *data;
> > + struct xen_9pfs_data ring;
> > +
> > + QEMUBH *bh;
> > +
> > + /* local copies, so that we can read/write PDU data directly from
> > + * the ring */
> > + RING_IDX out_cons, out_size, in_cons;
> > + bool inprogress;
> > +} Xen9pfsRing;
> > +
> > typedef struct Xen9pfsDev {
> > struct XenDevice xendev; /* must be first */
> > + V9fsState state;
> > + char *path;
> > + char *security_model;
> > + char *tag;
> > + char *id;
> > +
> > + int num_rings;
> > + Xen9pfsRing *rings;
> > } Xen9pfsDev;
> >
> > static ssize_t xen_9pfs_pdu_vmarshal(V9fsPDU *pdu,
> > @@ -73,22 +104,171 @@ static int xen_9pfs_init(struct XenDevice *xendev)
> > return 0;
> > }
> >
> > +static void xen_9pfs_bh(void *opaque)
> > +{
> > +}
> > +
> > +static void xen_9pfs_evtchn_event(void *opaque)
> > +{
> > +}
> > +
> > static int xen_9pfs_free(struct XenDevice *xendev)
> > {
> > - return -1;
> > + int i;
> > + Xen9pfsDev *xen_9pdev = container_of(xendev, Xen9pfsDev, xendev);
> > +
> > + if (xen_9pdev->id != NULL) {
> > + g_free(xen_9pdev->id);
> > + }
> > + if (xen_9pdev->tag != NULL) {
> > + g_free(xen_9pdev->tag);
> > + }
> > + if (xen_9pdev->path != NULL) {
> > + g_free(xen_9pdev->path);
> > + }
> > + if (xen_9pdev->security_model != NULL) {
> > + g_free(xen_9pdev->security_model);
> > + }
>
> You don't need the if's since g_free(NULL) is legal.
I'll make the changes, thanks
> > +
> > + for (i = 0; i < xen_9pdev->num_rings; i++) {
> > + if (xen_9pdev->rings[i].data != NULL) {
> > + xengnttab_unmap(xen_9pdev->xendev.gnttabdev,
> > + xen_9pdev->rings[i].data,
> > + (1 << XEN_9PFS_RING_ORDER));
> > + }
> > + if (xen_9pdev->rings[i].intf != NULL) {
> > + xengnttab_unmap(xen_9pdev->xendev.gnttabdev,
> > + xen_9pdev->rings[i].intf,
> > + 1);
> > + }
> > + if (xen_9pdev->rings[i].evtchndev > 0) {
> > + qemu_set_fd_handler(xenevtchn_fd(xen_9pdev->rings[i].evtchndev),
> > + NULL, NULL, NULL);
> > + xenevtchn_unbind(xen_9pdev->rings[i].evtchndev,
> > + xen_9pdev->rings[i].local_port);
> > + }
> > + if (xen_9pdev->rings[i].bh != NULL) {
> > + qemu_bh_delete(xen_9pdev->rings[i].bh);
> > + }
> > + }
> > + g_free(xen_9pdev->rings);
> > + return 0;
> > }
> >
> > static int xen_9pfs_connect(struct XenDevice *xendev)
> > {
> > + int i;
> > + Xen9pfsDev *xen_9pdev = container_of(xendev, Xen9pfsDev, xendev);
> > + V9fsState *s = &xen_9pdev->state;
> > + QemuOpts *fsdev;
> > +
> > + if (xenstore_read_fe_int(&xen_9pdev->xendev, "num-rings",
> > + &xen_9pdev->num_rings) == -1 ||
> > + xen_9pdev->num_rings > MAX_RINGS || xen_9pdev->num_rings < 1) {
> > + return -1;
> > + }
> > +
> > + xen_9pdev->rings = g_malloc0(xen_9pdev->num_rings * sizeof(Xen9pfsRing));
> > + for (i = 0; i < xen_9pdev->num_rings; i++) {
> > + char *str;
> > +
> > + xen_9pdev->rings[i].priv = xen_9pdev;
> > + xen_9pdev->rings[i].evtchn = -1;
> > + xen_9pdev->rings[i].local_port = -1;
> > +
> > + str = g_strdup_printf("ring-ref%u", i);
> > + if (xenstore_read_fe_int(&xen_9pdev->xendev, str,
> > + &xen_9pdev->rings[i].ref) == -1) {
> > + goto out;
> > + }
> > + g_free(str);
> > + str = g_strdup_printf("event-channel-%u", i);
> > + if (xenstore_read_fe_int(&xen_9pdev->xendev, str,
> > + &xen_9pdev->rings[i].evtchn) == -1) {
> > + goto out;
> > + }
> > + g_free(str);
> > +
> > + xen_9pdev->rings[i].intf = xengnttab_map_grant_ref(
> > + xen_9pdev->xendev.gnttabdev,
> > + xen_9pdev->xendev.dom,
> > + xen_9pdev->rings[i].ref,
> > + PROT_READ | PROT_WRITE);
> > + if (!xen_9pdev->rings[i].intf) {
> > + goto out;
> > + }
> > + xen_9pdev->rings[i].data = xengnttab_map_domain_grant_refs(
> > + xen_9pdev->xendev.gnttabdev,
> > + (1 << XEN_9PFS_RING_ORDER),
> > + xen_9pdev->xendev.dom,
> > + xen_9pdev->rings[i].intf->ref,
> > + PROT_READ | PROT_WRITE);
> > + if (!xen_9pdev->rings[i].data) {
> > + goto out;
> > + }
> > + xen_9pdev->rings[i].ring.in = xen_9pdev->rings[i].data;
> > + xen_9pdev->rings[i].ring.out = xen_9pdev->rings[i].data +
> > + XEN_9PFS_RING_SIZE;
> > +
> > + xen_9pdev->rings[i].bh = qemu_bh_new(xen_9pfs_bh, &xen_9pdev->rings[i]);
> > + xen_9pdev->rings[i].out_cons = 0;
> > + xen_9pdev->rings[i].out_size = 0;
> > + xen_9pdev->rings[i].inprogress = false;
> > +
> > +
> > + xen_9pdev->rings[i].evtchndev = xenevtchn_open(NULL, 0);
> > + if (xen_9pdev->rings[i].evtchndev == NULL) {
> > + goto out;
> > + }
> > + fcntl(xenevtchn_fd(xen_9pdev->rings[i].evtchndev), F_SETFD, FD_CLOEXEC);
> > + xen_9pdev->rings[i].local_port = xenevtchn_bind_interdomain
> > + (xen_9pdev->rings[i].evtchndev,
> > + xendev->dom,
> > + xen_9pdev->rings[i].evtchn);
> > + if (xen_9pdev->rings[i].local_port == -1) {
> > + xen_pv_printf(xendev, 0,
> > + "xenevtchn_bind_interdomain failed port=%d\n",
> > + xen_9pdev->rings[i].evtchn);
> > + goto out;
> > + }
> > + xen_pv_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port);
> > + qemu_set_fd_handler(xenevtchn_fd(xen_9pdev->rings[i].evtchndev),
> > + xen_9pfs_evtchn_event, NULL, &xen_9pdev->rings[i]);
> > + }
> > +
> > + xen_9pdev->security_model = xenstore_read_be_str(xendev, "security_model");
> > + xen_9pdev->path = xenstore_read_be_str(xendev, "path");
> > + xen_9pdev->id = s->fsconf.fsdev_id =
> > + g_strdup_printf("xen9p%d", xendev->dev);
> > + xen_9pdev->tag = s->fsconf.tag = xenstore_read_fe_str(xendev, "tag");
> > + v9fs_register_transport(s, &xen_9p_transport);
> > + fsdev = qemu_opts_create(qemu_find_opts("fsdev"),
> > + s->fsconf.tag,
> > + 1, NULL);
> > + qemu_opt_set(fsdev, "fsdriver", "local", NULL);
> > + qemu_opt_set(fsdev, "path", xen_9pdev->path, NULL);
> > + qemu_opt_set(fsdev, "security_model", xen_9pdev->security_model, NULL);
> > + qemu_opts_set_id(fsdev, s->fsconf.fsdev_id);
> > + qemu_fsdev_add(fsdev);
> > + v9fs_device_realize_common(s, NULL);
> > +
> > return 0;
> > +
> > +out:
> > + xen_9pfs_free(xendev);
> > + return -1;
> > }
> >
> > static void xen_9pfs_alloc(struct XenDevice *xendev)
> > {
> > + xenstore_write_be_str(xendev, "versions", VERSIONS);
> > + xenstore_write_be_int(xendev, "max-rings", MAX_RINGS);
> > + xenstore_write_be_int(xendev, "max-ring-page-order", MAX_RING_ORDER);
> > }
> >
> > static void xen_9pfs_disconnect(struct XenDevice *xendev)
> > {
> > + /* Dynamic hotplug of PV filesystems at runtime is not supported. */
> > }
> >
> > struct XenDevOps xen_9pfs_ops = {
>
>
^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH v3 5/9] xen/9pfs: connect to the frontend
@ 2017-03-17 17:40 ` Stefano Stabellini
0 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-17 17:40 UTC (permalink / raw)
To: Greg Kurz
Cc: jgross, Stefano Stabellini, qemu-devel, Stefano Stabellini,
Aneesh Kumar K.V, anthony.perard, xen-devel
On Fri, 17 Mar 2017, Greg Kurz wrote:
> On Thu, 16 Mar 2017 13:01:54 -0700
> Stefano Stabellini <sstabellini@kernel.org> wrote:
>
> > Write the limits of the backend to xenstore. Connect to the frontend.
> > Upon connection, allocate the rings according to the protocol
> > specification.
> >
> > Initialize a QEMUBH to schedule work upon receiving an event channel
> > notification from the frontend.
> >
> > Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
> > CC: anthony.perard@citrix.com
> > CC: jgross@suse.com
> > CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> > CC: Greg Kurz <groug@kaod.org>
> > ---
> > hw/9pfs/xen-9p-backend.c | 182 ++++++++++++++++++++++++++++++++++++++++++++++-
> > 1 file changed, 181 insertions(+), 1 deletion(-)
> >
> > diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
> > index 92bb805..3fd20ff 100644
> > --- a/hw/9pfs/xen-9p-backend.c
> > +++ b/hw/9pfs/xen-9p-backend.c
> > @@ -23,8 +23,39 @@
> > #define XEN_9PFS_RING_SIZE XEN_FLEX_RING_SIZE(XEN_9PFS_RING_ORDER)
> > DEFINE_XEN_FLEX_RING_AND_INTF(xen_9pfs);
> >
> > +#define VERSIONS "1"
> > +#define MAX_RINGS 8
> > +#define MAX_RING_ORDER 8
> > +
> > +typedef struct Xen9pfsRing {
> > + struct Xen9pfsDev *priv;
> > +
> > + int ref;
> > + xenevtchn_handle *evtchndev;
> > + int evtchn;
> > + int local_port;
> > + struct xen_9pfs_data_intf *intf;
> > + unsigned char *data;
> > + struct xen_9pfs_data ring;
> > +
> > + QEMUBH *bh;
> > +
> > + /* local copies, so that we can read/write PDU data directly from
> > + * the ring */
> > + RING_IDX out_cons, out_size, in_cons;
> > + bool inprogress;
> > +} Xen9pfsRing;
> > +
> > typedef struct Xen9pfsDev {
> > struct XenDevice xendev; /* must be first */
> > + V9fsState state;
> > + char *path;
> > + char *security_model;
> > + char *tag;
> > + char *id;
> > +
> > + int num_rings;
> > + Xen9pfsRing *rings;
> > } Xen9pfsDev;
> >
> > static ssize_t xen_9pfs_pdu_vmarshal(V9fsPDU *pdu,
> > @@ -73,22 +104,171 @@ static int xen_9pfs_init(struct XenDevice *xendev)
> > return 0;
> > }
> >
> > +static void xen_9pfs_bh(void *opaque)
> > +{
> > +}
> > +
> > +static void xen_9pfs_evtchn_event(void *opaque)
> > +{
> > +}
> > +
> > static int xen_9pfs_free(struct XenDevice *xendev)
> > {
> > - return -1;
> > + int i;
> > + Xen9pfsDev *xen_9pdev = container_of(xendev, Xen9pfsDev, xendev);
> > +
> > + if (xen_9pdev->id != NULL) {
> > + g_free(xen_9pdev->id);
> > + }
> > + if (xen_9pdev->tag != NULL) {
> > + g_free(xen_9pdev->tag);
> > + }
> > + if (xen_9pdev->path != NULL) {
> > + g_free(xen_9pdev->path);
> > + }
> > + if (xen_9pdev->security_model != NULL) {
> > + g_free(xen_9pdev->security_model);
> > + }
>
> You don't need the if's since g_free(NULL) is legal.
I'll make the changes, thanks
> > +
> > + for (i = 0; i < xen_9pdev->num_rings; i++) {
> > + if (xen_9pdev->rings[i].data != NULL) {
> > + xengnttab_unmap(xen_9pdev->xendev.gnttabdev,
> > + xen_9pdev->rings[i].data,
> > + (1 << XEN_9PFS_RING_ORDER));
> > + }
> > + if (xen_9pdev->rings[i].intf != NULL) {
> > + xengnttab_unmap(xen_9pdev->xendev.gnttabdev,
> > + xen_9pdev->rings[i].intf,
> > + 1);
> > + }
> > + if (xen_9pdev->rings[i].evtchndev > 0) {
> > + qemu_set_fd_handler(xenevtchn_fd(xen_9pdev->rings[i].evtchndev),
> > + NULL, NULL, NULL);
> > + xenevtchn_unbind(xen_9pdev->rings[i].evtchndev,
> > + xen_9pdev->rings[i].local_port);
> > + }
> > + if (xen_9pdev->rings[i].bh != NULL) {
> > + qemu_bh_delete(xen_9pdev->rings[i].bh);
> > + }
> > + }
> > + g_free(xen_9pdev->rings);
> > + return 0;
> > }
> >
> > static int xen_9pfs_connect(struct XenDevice *xendev)
> > {
> > + int i;
> > + Xen9pfsDev *xen_9pdev = container_of(xendev, Xen9pfsDev, xendev);
> > + V9fsState *s = &xen_9pdev->state;
> > + QemuOpts *fsdev;
> > +
> > + if (xenstore_read_fe_int(&xen_9pdev->xendev, "num-rings",
> > + &xen_9pdev->num_rings) == -1 ||
> > + xen_9pdev->num_rings > MAX_RINGS || xen_9pdev->num_rings < 1) {
> > + return -1;
> > + }
> > +
> > + xen_9pdev->rings = g_malloc0(xen_9pdev->num_rings * sizeof(Xen9pfsRing));
> > + for (i = 0; i < xen_9pdev->num_rings; i++) {
> > + char *str;
> > +
> > + xen_9pdev->rings[i].priv = xen_9pdev;
> > + xen_9pdev->rings[i].evtchn = -1;
> > + xen_9pdev->rings[i].local_port = -1;
> > +
> > + str = g_strdup_printf("ring-ref%u", i);
> > + if (xenstore_read_fe_int(&xen_9pdev->xendev, str,
> > + &xen_9pdev->rings[i].ref) == -1) {
> > + goto out;
> > + }
> > + g_free(str);
> > + str = g_strdup_printf("event-channel-%u", i);
> > + if (xenstore_read_fe_int(&xen_9pdev->xendev, str,
> > + &xen_9pdev->rings[i].evtchn) == -1) {
> > + goto out;
> > + }
> > + g_free(str);
> > +
> > + xen_9pdev->rings[i].intf = xengnttab_map_grant_ref(
> > + xen_9pdev->xendev.gnttabdev,
> > + xen_9pdev->xendev.dom,
> > + xen_9pdev->rings[i].ref,
> > + PROT_READ | PROT_WRITE);
> > + if (!xen_9pdev->rings[i].intf) {
> > + goto out;
> > + }
> > + xen_9pdev->rings[i].data = xengnttab_map_domain_grant_refs(
> > + xen_9pdev->xendev.gnttabdev,
> > + (1 << XEN_9PFS_RING_ORDER),
> > + xen_9pdev->xendev.dom,
> > + xen_9pdev->rings[i].intf->ref,
> > + PROT_READ | PROT_WRITE);
> > + if (!xen_9pdev->rings[i].data) {
> > + goto out;
> > + }
> > + xen_9pdev->rings[i].ring.in = xen_9pdev->rings[i].data;
> > + xen_9pdev->rings[i].ring.out = xen_9pdev->rings[i].data +
> > + XEN_9PFS_RING_SIZE;
> > +
> > + xen_9pdev->rings[i].bh = qemu_bh_new(xen_9pfs_bh, &xen_9pdev->rings[i]);
> > + xen_9pdev->rings[i].out_cons = 0;
> > + xen_9pdev->rings[i].out_size = 0;
> > + xen_9pdev->rings[i].inprogress = false;
> > +
> > +
> > + xen_9pdev->rings[i].evtchndev = xenevtchn_open(NULL, 0);
> > + if (xen_9pdev->rings[i].evtchndev == NULL) {
> > + goto out;
> > + }
> > + fcntl(xenevtchn_fd(xen_9pdev->rings[i].evtchndev), F_SETFD, FD_CLOEXEC);
> > + xen_9pdev->rings[i].local_port = xenevtchn_bind_interdomain
> > + (xen_9pdev->rings[i].evtchndev,
> > + xendev->dom,
> > + xen_9pdev->rings[i].evtchn);
> > + if (xen_9pdev->rings[i].local_port == -1) {
> > + xen_pv_printf(xendev, 0,
> > + "xenevtchn_bind_interdomain failed port=%d\n",
> > + xen_9pdev->rings[i].evtchn);
> > + goto out;
> > + }
> > + xen_pv_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port);
> > + qemu_set_fd_handler(xenevtchn_fd(xen_9pdev->rings[i].evtchndev),
> > + xen_9pfs_evtchn_event, NULL, &xen_9pdev->rings[i]);
> > + }
> > +
> > + xen_9pdev->security_model = xenstore_read_be_str(xendev, "security_model");
> > + xen_9pdev->path = xenstore_read_be_str(xendev, "path");
> > + xen_9pdev->id = s->fsconf.fsdev_id =
> > + g_strdup_printf("xen9p%d", xendev->dev);
> > + xen_9pdev->tag = s->fsconf.tag = xenstore_read_fe_str(xendev, "tag");
> > + v9fs_register_transport(s, &xen_9p_transport);
> > + fsdev = qemu_opts_create(qemu_find_opts("fsdev"),
> > + s->fsconf.tag,
> > + 1, NULL);
> > + qemu_opt_set(fsdev, "fsdriver", "local", NULL);
> > + qemu_opt_set(fsdev, "path", xen_9pdev->path, NULL);
> > + qemu_opt_set(fsdev, "security_model", xen_9pdev->security_model, NULL);
> > + qemu_opts_set_id(fsdev, s->fsconf.fsdev_id);
> > + qemu_fsdev_add(fsdev);
> > + v9fs_device_realize_common(s, NULL);
> > +
> > return 0;
> > +
> > +out:
> > + xen_9pfs_free(xendev);
> > + return -1;
> > }
> >
> > static void xen_9pfs_alloc(struct XenDevice *xendev)
> > {
> > + xenstore_write_be_str(xendev, "versions", VERSIONS);
> > + xenstore_write_be_int(xendev, "max-rings", MAX_RINGS);
> > + xenstore_write_be_int(xendev, "max-ring-page-order", MAX_RING_ORDER);
> > }
> >
> > static void xen_9pfs_disconnect(struct XenDevice *xendev)
> > {
> > + /* Dynamic hotplug of PV filesystems at runtime is not supported. */
> > }
> >
> > struct XenDevOps xen_9pfs_ops = {
>
>
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [Qemu-devel] [PATCH v3 7/9] xen/9pfs: implement in/out_iov_from_pdu and vmarshal/vunmarshal
2017-03-17 13:27 ` Greg Kurz
@ 2017-03-17 18:19 ` Stefano Stabellini
-1 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-17 18:19 UTC (permalink / raw)
To: Greg Kurz
Cc: Stefano Stabellini, qemu-devel, xen-devel, jgross,
Stefano Stabellini, anthony.perard, Aneesh Kumar K.V
On Fri, 17 Mar 2017, Greg Kurz wrote:
> On Thu, 16 Mar 2017 13:01:56 -0700
> Stefano Stabellini <sstabellini@kernel.org> wrote:
>
> > Implement xen_9pfs_init_in/out_iov_from_pdu and
> > xen_9pfs_pdu_vmarshal/vunmarshall by creating new sg pointing to the
> > data on the ring.
> >
> > This is safe as we only handle one request per ring at any given time.
> >
> > Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
> > CC: anthony.perard@citrix.com
> > CC: jgross@suse.com
> > CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> > CC: Greg Kurz <groug@kaod.org>
> > ---
> > hw/9pfs/xen-9p-backend.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++--
> > 1 file changed, 90 insertions(+), 2 deletions(-)
> >
> > diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
> > index f757591..0a1eb34 100644
> > --- a/hw/9pfs/xen-9p-backend.c
> > +++ b/hw/9pfs/xen-9p-backend.c
> > @@ -58,12 +58,78 @@ typedef struct Xen9pfsDev {
> > Xen9pfsRing *rings;
> > } Xen9pfsDev;
> >
> > +static void xen_9pfs_in_sg(Xen9pfsRing *ring,
> > + struct iovec *in_sg,
> > + int *num,
> > + uint32_t idx,
> > + uint32_t size)
> > +{
> > + RING_IDX cons, prod, masked_prod, masked_cons;
> > +
> > + cons = ring->intf->in_cons;
> > + prod = ring->intf->in_prod;
> > + xen_rmb();
> > + masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE);
> > + masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
> > +
> > + if (masked_prod < masked_cons) {
> > + in_sg[0].iov_base = ring->ring.in + masked_prod;
> > + in_sg[0].iov_len = masked_cons - masked_prod;
> > + *num = 1;
> > + } else {
> > + in_sg[0].iov_base = ring->ring.in + masked_prod;
> > + in_sg[0].iov_len = XEN_9PFS_RING_SIZE - masked_prod;
> > + in_sg[1].iov_base = ring->ring.in;
> > + in_sg[1].iov_len = masked_cons;
> > + *num = 2;
> > + }
> > +}
> > +
> > +static void xen_9pfs_out_sg(Xen9pfsRing *ring,
> > + struct iovec *out_sg,
> > + int *num,
> > + uint32_t idx)
> > +{
> > + RING_IDX cons, prod, masked_prod, masked_cons;
> > +
> > + cons = ring->intf->out_cons;
> > + prod = ring->intf->out_prod;
> > + xen_rmb();
> > + masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE);
> > + masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
> > +
> > + if (masked_cons < masked_prod) {
> > + out_sg[0].iov_base = ring->ring.out + masked_cons;
> > + out_sg[0].iov_len = ring->out_size;
> > + *num = 1;
> > + } else {
> > + if (ring->out_size > (XEN_9PFS_RING_SIZE - masked_cons)) {
> > + out_sg[0].iov_base = ring->ring.out + masked_cons;
> > + out_sg[0].iov_len = XEN_9PFS_RING_SIZE - masked_cons;
> > + out_sg[1].iov_base = ring->ring.out;
> > + out_sg[1].iov_len = ring->out_size -
> > + (XEN_9PFS_RING_SIZE - masked_cons);
> > + *num = 2;
> > + } else {
> > + out_sg[0].iov_base = ring->ring.out + masked_cons;
> > + out_sg[0].iov_len = ring->out_size;
> > + *num = 1;
> > + }
> > + }
> > +}
> > +
> > static ssize_t xen_9pfs_pdu_vmarshal(V9fsPDU *pdu,
> > size_t offset,
> > const char *fmt,
> > va_list ap)
> > {
> > - return 0;
> > + Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
> > + struct iovec in_sg[2];
> > + int num;
> > +
> > + xen_9pfs_in_sg(&xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings],
> > + in_sg, &num, pdu->idx, ROUND_UP(offset + 128, 512));
> > + return v9fs_iov_vmarshal(in_sg, num, offset, 0, fmt, ap);
> > }
> >
> > static ssize_t xen_9pfs_pdu_vunmarshal(V9fsPDU *pdu,
> > @@ -71,13 +137,27 @@ static ssize_t xen_9pfs_pdu_vunmarshal(V9fsPDU *pdu,
> > const char *fmt,
> > va_list ap)
> > {
> > - return 0;
> > + Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
> > + struct iovec out_sg[2];
> > + int num;
> > +
> > + xen_9pfs_out_sg(&xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings],
> > + out_sg, &num, pdu->idx);
> > + return v9fs_iov_vunmarshal(out_sg, num, offset, 0, fmt, ap);
> > }
> >
> > static void xen_9pfs_init_out_iov_from_pdu(V9fsPDU *pdu,
> > struct iovec **piov,
> > unsigned int *pniov)
> > {
> > + Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
> > + Xen9pfsRing *ring = &xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings];
> > + struct iovec *sg = g_malloc0(sizeof(*sg) * 2);
>
> I had overlooked in v2, sorry for that. Where does *sg gets freed ?
Uhm, I mistakenly believed that qemu_iovec_destroy would do that, but
actually it only frees the iovec allocated by qemu_iovec_init. I'll add
a g_free here, xen_9pfs_init_in_iov_from_pdu, and in
xen_9pfs_push_and_notify: the iovec is immediately concatenated into a
different iovec, so there are no risks in freeing it at soon as possible.
> > + int num;
> > +
> > + xen_9pfs_out_sg(ring, sg, &num, pdu->idx);
> > + *piov = sg;
> > + *pniov = num;
> > }
> >
> > static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu,
> > @@ -85,6 +165,14 @@ static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu,
> > unsigned int *pniov,
> > size_t size)
> > {
> > + Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
> > + Xen9pfsRing *ring = &xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings];
> > + struct iovec *sg = g_malloc0(sizeof(*sg) * 2);
>
> Same here.
>
> > + int num;
> > +
> > + xen_9pfs_in_sg(ring, sg, &num, pdu->idx, size);
> > + *piov = sg;
> > + *pniov = num;
> > }
> >
> > static void xen_9pfs_push_and_notify(V9fsPDU *pdu)
^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [PATCH v3 7/9] xen/9pfs: implement in/out_iov_from_pdu and vmarshal/vunmarshal
@ 2017-03-17 18:19 ` Stefano Stabellini
0 siblings, 0 replies; 40+ messages in thread
From: Stefano Stabellini @ 2017-03-17 18:19 UTC (permalink / raw)
To: Greg Kurz
Cc: jgross, Stefano Stabellini, qemu-devel, Stefano Stabellini,
Aneesh Kumar K.V, anthony.perard, xen-devel
On Fri, 17 Mar 2017, Greg Kurz wrote:
> On Thu, 16 Mar 2017 13:01:56 -0700
> Stefano Stabellini <sstabellini@kernel.org> wrote:
>
> > Implement xen_9pfs_init_in/out_iov_from_pdu and
> > xen_9pfs_pdu_vmarshal/vunmarshall by creating new sg pointing to the
> > data on the ring.
> >
> > This is safe as we only handle one request per ring at any given time.
> >
> > Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
> > CC: anthony.perard@citrix.com
> > CC: jgross@suse.com
> > CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> > CC: Greg Kurz <groug@kaod.org>
> > ---
> > hw/9pfs/xen-9p-backend.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++--
> > 1 file changed, 90 insertions(+), 2 deletions(-)
> >
> > diff --git a/hw/9pfs/xen-9p-backend.c b/hw/9pfs/xen-9p-backend.c
> > index f757591..0a1eb34 100644
> > --- a/hw/9pfs/xen-9p-backend.c
> > +++ b/hw/9pfs/xen-9p-backend.c
> > @@ -58,12 +58,78 @@ typedef struct Xen9pfsDev {
> > Xen9pfsRing *rings;
> > } Xen9pfsDev;
> >
> > +static void xen_9pfs_in_sg(Xen9pfsRing *ring,
> > + struct iovec *in_sg,
> > + int *num,
> > + uint32_t idx,
> > + uint32_t size)
> > +{
> > + RING_IDX cons, prod, masked_prod, masked_cons;
> > +
> > + cons = ring->intf->in_cons;
> > + prod = ring->intf->in_prod;
> > + xen_rmb();
> > + masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE);
> > + masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
> > +
> > + if (masked_prod < masked_cons) {
> > + in_sg[0].iov_base = ring->ring.in + masked_prod;
> > + in_sg[0].iov_len = masked_cons - masked_prod;
> > + *num = 1;
> > + } else {
> > + in_sg[0].iov_base = ring->ring.in + masked_prod;
> > + in_sg[0].iov_len = XEN_9PFS_RING_SIZE - masked_prod;
> > + in_sg[1].iov_base = ring->ring.in;
> > + in_sg[1].iov_len = masked_cons;
> > + *num = 2;
> > + }
> > +}
> > +
> > +static void xen_9pfs_out_sg(Xen9pfsRing *ring,
> > + struct iovec *out_sg,
> > + int *num,
> > + uint32_t idx)
> > +{
> > + RING_IDX cons, prod, masked_prod, masked_cons;
> > +
> > + cons = ring->intf->out_cons;
> > + prod = ring->intf->out_prod;
> > + xen_rmb();
> > + masked_prod = xen_9pfs_mask(prod, XEN_9PFS_RING_SIZE);
> > + masked_cons = xen_9pfs_mask(cons, XEN_9PFS_RING_SIZE);
> > +
> > + if (masked_cons < masked_prod) {
> > + out_sg[0].iov_base = ring->ring.out + masked_cons;
> > + out_sg[0].iov_len = ring->out_size;
> > + *num = 1;
> > + } else {
> > + if (ring->out_size > (XEN_9PFS_RING_SIZE - masked_cons)) {
> > + out_sg[0].iov_base = ring->ring.out + masked_cons;
> > + out_sg[0].iov_len = XEN_9PFS_RING_SIZE - masked_cons;
> > + out_sg[1].iov_base = ring->ring.out;
> > + out_sg[1].iov_len = ring->out_size -
> > + (XEN_9PFS_RING_SIZE - masked_cons);
> > + *num = 2;
> > + } else {
> > + out_sg[0].iov_base = ring->ring.out + masked_cons;
> > + out_sg[0].iov_len = ring->out_size;
> > + *num = 1;
> > + }
> > + }
> > +}
> > +
> > static ssize_t xen_9pfs_pdu_vmarshal(V9fsPDU *pdu,
> > size_t offset,
> > const char *fmt,
> > va_list ap)
> > {
> > - return 0;
> > + Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
> > + struct iovec in_sg[2];
> > + int num;
> > +
> > + xen_9pfs_in_sg(&xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings],
> > + in_sg, &num, pdu->idx, ROUND_UP(offset + 128, 512));
> > + return v9fs_iov_vmarshal(in_sg, num, offset, 0, fmt, ap);
> > }
> >
> > static ssize_t xen_9pfs_pdu_vunmarshal(V9fsPDU *pdu,
> > @@ -71,13 +137,27 @@ static ssize_t xen_9pfs_pdu_vunmarshal(V9fsPDU *pdu,
> > const char *fmt,
> > va_list ap)
> > {
> > - return 0;
> > + Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
> > + struct iovec out_sg[2];
> > + int num;
> > +
> > + xen_9pfs_out_sg(&xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings],
> > + out_sg, &num, pdu->idx);
> > + return v9fs_iov_vunmarshal(out_sg, num, offset, 0, fmt, ap);
> > }
> >
> > static void xen_9pfs_init_out_iov_from_pdu(V9fsPDU *pdu,
> > struct iovec **piov,
> > unsigned int *pniov)
> > {
> > + Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
> > + Xen9pfsRing *ring = &xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings];
> > + struct iovec *sg = g_malloc0(sizeof(*sg) * 2);
>
> I had overlooked in v2, sorry for that. Where does *sg gets freed ?
Uhm, I mistakenly believed that qemu_iovec_destroy would do that, but
actually it only frees the iovec allocated by qemu_iovec_init. I'll add
a g_free here, xen_9pfs_init_in_iov_from_pdu, and in
xen_9pfs_push_and_notify: the iovec is immediately concatenated into a
different iovec, so there are no risks in freeing it at soon as possible.
> > + int num;
> > +
> > + xen_9pfs_out_sg(ring, sg, &num, pdu->idx);
> > + *piov = sg;
> > + *pniov = num;
> > }
> >
> > static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu,
> > @@ -85,6 +165,14 @@ static void xen_9pfs_init_in_iov_from_pdu(V9fsPDU *pdu,
> > unsigned int *pniov,
> > size_t size)
> > {
> > + Xen9pfsDev *xen_9pfs = container_of(pdu->s, Xen9pfsDev, state);
> > + Xen9pfsRing *ring = &xen_9pfs->rings[pdu->tag % xen_9pfs->num_rings];
> > + struct iovec *sg = g_malloc0(sizeof(*sg) * 2);
>
> Same here.
>
> > + int num;
> > +
> > + xen_9pfs_in_sg(ring, sg, &num, pdu->idx, size);
> > + *piov = sg;
> > + *pniov = num;
> > }
> >
> > static void xen_9pfs_push_and_notify(V9fsPDU *pdu)
_______________________________________________
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Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [Qemu-devel] [PATCH v3 3/9] 9p: introduce a type for the 9p header
2017-03-17 11:16 ` Greg Kurz
@ 2017-03-17 21:06 ` Philippe Mathieu-Daudé
-1 siblings, 0 replies; 40+ messages in thread
From: Philippe Mathieu-Daudé @ 2017-03-17 21:06 UTC (permalink / raw)
To: Greg Kurz, Stefano Stabellini
Cc: jgross, qemu-devel, Stefano Stabellini, Aneesh Kumar K.V,
anthony.perard, xen-devel
On 03/17/2017 08:16 AM, Greg Kurz wrote:
> On Thu, 16 Mar 2017 13:01:52 -0700
> Stefano Stabellini <sstabellini@kernel.org> wrote:
>
>> Use the new type in virtio-9p-device.
>>
>> Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
>> CC: anthony.perard@citrix.com
>> CC: jgross@suse.com
>> CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
>> CC: Greg Kurz <groug@kaod.org>
>> ---
>
> Reviewed-by: Greg Kurz <groug@kaod.org>
>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
>> hw/9pfs/9p.h | 6 ++++++
>> hw/9pfs/virtio-9p-device.c | 6 +-----
>> 2 files changed, 7 insertions(+), 5 deletions(-)
>>
>> diff --git a/hw/9pfs/9p.h b/hw/9pfs/9p.h
>> index b7e8362..5312d8a 100644
>> --- a/hw/9pfs/9p.h
>> +++ b/hw/9pfs/9p.h
>> @@ -119,6 +119,12 @@ static inline char *rpath(FsContext *ctx, const char *path)
>> typedef struct V9fsPDU V9fsPDU;
>> struct V9fsState;
>>
>> +typedef struct {
>> + uint32_t size_le;
>> + uint8_t id;
>> + uint16_t tag_le;
>> +} QEMU_PACKED P9MsgHeader;
>> +
>> struct V9fsPDU
>> {
>> uint32_t size;
>> diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
>> index 27a4a32..3782f43 100644
>> --- a/hw/9pfs/virtio-9p-device.c
>> +++ b/hw/9pfs/virtio-9p-device.c
>> @@ -46,11 +46,7 @@ static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
>> VirtQueueElement *elem;
>>
>> while ((pdu = pdu_alloc(s))) {
>> - struct {
>> - uint32_t size_le;
>> - uint8_t id;
>> - uint16_t tag_le;
>> - } QEMU_PACKED out;
>> + P9MsgHeader out;
>>
>> elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
>> if (!elem) {
>
^ permalink raw reply [flat|nested] 40+ messages in thread
* Re: [Qemu-devel] [PATCH v3 3/9] 9p: introduce a type for the 9p header
@ 2017-03-17 21:06 ` Philippe Mathieu-Daudé
0 siblings, 0 replies; 40+ messages in thread
From: Philippe Mathieu-Daudé @ 2017-03-17 21:06 UTC (permalink / raw)
To: Greg Kurz, Stefano Stabellini
Cc: jgross, qemu-devel, Stefano Stabellini, Aneesh Kumar K.V,
anthony.perard, xen-devel
On 03/17/2017 08:16 AM, Greg Kurz wrote:
> On Thu, 16 Mar 2017 13:01:52 -0700
> Stefano Stabellini <sstabellini@kernel.org> wrote:
>
>> Use the new type in virtio-9p-device.
>>
>> Signed-off-by: Stefano Stabellini <stefano@aporeto.com>
>> CC: anthony.perard@citrix.com
>> CC: jgross@suse.com
>> CC: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
>> CC: Greg Kurz <groug@kaod.org>
>> ---
>
> Reviewed-by: Greg Kurz <groug@kaod.org>
>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
>> hw/9pfs/9p.h | 6 ++++++
>> hw/9pfs/virtio-9p-device.c | 6 +-----
>> 2 files changed, 7 insertions(+), 5 deletions(-)
>>
>> diff --git a/hw/9pfs/9p.h b/hw/9pfs/9p.h
>> index b7e8362..5312d8a 100644
>> --- a/hw/9pfs/9p.h
>> +++ b/hw/9pfs/9p.h
>> @@ -119,6 +119,12 @@ static inline char *rpath(FsContext *ctx, const char *path)
>> typedef struct V9fsPDU V9fsPDU;
>> struct V9fsState;
>>
>> +typedef struct {
>> + uint32_t size_le;
>> + uint8_t id;
>> + uint16_t tag_le;
>> +} QEMU_PACKED P9MsgHeader;
>> +
>> struct V9fsPDU
>> {
>> uint32_t size;
>> diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
>> index 27a4a32..3782f43 100644
>> --- a/hw/9pfs/virtio-9p-device.c
>> +++ b/hw/9pfs/virtio-9p-device.c
>> @@ -46,11 +46,7 @@ static void handle_9p_output(VirtIODevice *vdev, VirtQueue *vq)
>> VirtQueueElement *elem;
>>
>> while ((pdu = pdu_alloc(s))) {
>> - struct {
>> - uint32_t size_le;
>> - uint8_t id;
>> - uint16_t tag_le;
>> - } QEMU_PACKED out;
>> + P9MsgHeader out;
>>
>> elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
>> if (!elem) {
>
_______________________________________________
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Xen-devel@lists.xen.org
https://lists.xen.org/xen-devel
^ permalink raw reply [flat|nested] 40+ messages in thread
end of thread, other threads:[~2017-03-17 21:06 UTC | newest]
Thread overview: 40+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-03-16 20:00 [Qemu-devel] [PATCH v3 0/9] xen/9pfs: introduce the Xen 9pfs backend Stefano Stabellini
2017-03-16 20:00 ` Stefano Stabellini
2017-03-16 20:01 ` [Qemu-devel] [PATCH v3 1/9] xen: do not build backends for targets that do not support xen Stefano Stabellini
2017-03-16 20:01 ` Stefano Stabellini
2017-03-16 20:01 ` [Qemu-devel] [PATCH v3 2/9] xen: import ring.h from xen Stefano Stabellini
2017-03-16 20:01 ` Stefano Stabellini
2017-03-17 11:15 ` [Qemu-devel] " Greg Kurz
2017-03-17 11:15 ` Greg Kurz
2017-03-16 20:01 ` [Qemu-devel] [PATCH v3 3/9] 9p: introduce a type for the 9p header Stefano Stabellini
2017-03-16 20:01 ` Stefano Stabellini
2017-03-17 11:16 ` [Qemu-devel] " Greg Kurz
2017-03-17 11:16 ` Greg Kurz
2017-03-17 21:06 ` [Qemu-devel] " Philippe Mathieu-Daudé
2017-03-17 21:06 ` Philippe Mathieu-Daudé
2017-03-16 20:01 ` [Qemu-devel] [PATCH v3 4/9] xen/9pfs: introduce Xen 9pfs backend Stefano Stabellini
2017-03-16 20:01 ` Stefano Stabellini
2017-03-16 20:01 ` [Qemu-devel] [PATCH v3 5/9] xen/9pfs: connect to the frontend Stefano Stabellini
2017-03-16 20:01 ` Stefano Stabellini
2017-03-17 13:22 ` [Qemu-devel] " Greg Kurz
2017-03-17 13:22 ` Greg Kurz
2017-03-17 17:40 ` [Qemu-devel] " Stefano Stabellini
2017-03-17 17:40 ` Stefano Stabellini
2017-03-16 20:01 ` [Qemu-devel] [PATCH v3 6/9] xen/9pfs: receive requests from " Stefano Stabellini
2017-03-16 20:01 ` Stefano Stabellini
2017-03-16 20:01 ` [Qemu-devel] [PATCH v3 7/9] xen/9pfs: implement in/out_iov_from_pdu and vmarshal/vunmarshal Stefano Stabellini
2017-03-16 20:01 ` Stefano Stabellini
2017-03-17 13:27 ` [Qemu-devel] " Greg Kurz
2017-03-17 13:27 ` Greg Kurz
2017-03-17 18:19 ` [Qemu-devel] " Stefano Stabellini
2017-03-17 18:19 ` Stefano Stabellini
2017-03-16 20:01 ` [Qemu-devel] [PATCH v3 8/9] xen/9pfs: send responses back to the frontend Stefano Stabellini
2017-03-16 20:01 ` Stefano Stabellini
2017-03-16 20:01 ` [Qemu-devel] [PATCH v3 9/9] xen/9pfs: build and register Xen 9pfs backend Stefano Stabellini
2017-03-16 20:01 ` Stefano Stabellini
2017-03-17 11:08 ` [Qemu-devel] [PATCH v3 1/9] xen: do not build backends for targets that do not support xen Greg Kurz
2017-03-17 11:08 ` Greg Kurz
2017-03-17 11:10 ` [Qemu-devel] " Paolo Bonzini
2017-03-17 11:10 ` Paolo Bonzini
2017-03-17 17:34 ` [Qemu-devel] " Stefano Stabellini
2017-03-17 17:34 ` Stefano Stabellini
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