From: Joao Martins <joao.m.martins@oracle.com>
To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
xen-devel@lists.xenproject.org
Cc: "Ankur Arora" <ankur.a.arora@oracle.com>,
"Boris Ostrovsky" <boris.ostrovsky@oracle.com>,
"Joao Martins" <joao.m.martins@oracle.com>,
"Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"Borislav Petkov" <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, "Juergen Gross" <jgross@suse.com>,
"Stefano Stabellini" <sstabellini@kernel.org>
Subject: [PATCH RFC 31/39] xen-shim: introduce shim domain driver
Date: Wed, 20 Feb 2019 20:16:01 +0000 [thread overview]
Message-ID: <20190220201609.28290-32-joao.m.martins@oracle.com> (raw)
In-Reply-To: <20190220201609.28290-1-joao.m.martins@oracle.com>
From: Ankur Arora <ankur.a.arora@oracle.com>
xen-shim.ko sets up and tears down state needed to support Xen
backends. The underlying primitives that are exposed are interdomain
event-channels and grant-table map/unmap/copy.
We setup the following:
* Initialize shared_info and vcpu_info pages, essentially setting
up event-channel state.
* Set up features (this allows xen_feature() to work)
* Initialize event-channel subsystem (select event ops and related
setup.)
* Initialize xenbus and tear it down on module exit.
This functionality would be used by the backend drivers (e.g. netback,
scsiback, blkback etc) in order to drive guest I/O.
Co-developed-by: Joao Martins <joao.m.martins@oracle.com>
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
---
arch/x86/include/asm/kvm_host.h | 2 +
arch/x86/kvm/Kconfig | 10 +++
arch/x86/kvm/Makefile | 1 +
arch/x86/kvm/xen-shim.c | 107 +++++++++++++++++++++++++++++++
arch/x86/xen/enlighten.c | 45 +++++++++++++
drivers/xen/events/events_2l.c | 2 +-
drivers/xen/events/events_base.c | 6 +-
drivers/xen/features.c | 1 +
drivers/xen/xenbus/xenbus_dev_frontend.c | 4 +-
include/xen/xen.h | 5 ++
include/xen/xenbus.h | 3 +
11 files changed, 182 insertions(+), 4 deletions(-)
create mode 100644 arch/x86/kvm/xen-shim.c
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 55609e919e14..6bdae8649d56 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -896,6 +896,8 @@ struct kvm_grant_table {
/* Xen emulation context */
struct kvm_xen {
u64 xen_hypercall;
+
+#define XEN_SHIM_DOMID 0
domid_t domid;
gfn_t shinfo_addr;
diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index 72fa955f4a15..47347df282dc 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -96,6 +96,16 @@ config KVM_MMU_AUDIT
This option adds a R/W kVM module parameter 'mmu_audit', which allows
auditing of KVM MMU events at runtime.
+config XEN_SHIM
+ tristate "Xen hypercall emulation shim"
+ depends on KVM
+ depends on XEN
+ default m
+ help
+ Shim to support Xen hypercalls on non-Xen hosts. It intercepts grant
+ table and event channels hypercalls same way as Xen hypervisor. This is
+ useful for having Xen backend drivers work on KVM.
+
# OK, it's a little counter-intuitive to do this, but it puts it neatly under
# the virtualization menu.
source "drivers/vhost/Kconfig"
diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index c1eaabbd0a54..a96a96a002a7 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -18,3 +18,4 @@ kvm-amd-y += svm.o pmu_amd.o
obj-$(CONFIG_KVM) += kvm.o
obj-$(CONFIG_KVM_INTEL) += kvm-intel.o
obj-$(CONFIG_KVM_AMD) += kvm-amd.o
+obj-$(CONFIG_XEN_SHIM) += xen-shim.o
diff --git a/arch/x86/kvm/xen-shim.c b/arch/x86/kvm/xen-shim.c
new file mode 100644
index 000000000000..61fdceb63ec2
--- /dev/null
+++ b/arch/x86/kvm/xen-shim.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 Oracle and/or its affiliates. All rights reserved.
+ *
+ * Xen hypercall emulation shim
+ */
+
+#define pr_fmt(fmt) "KVM:" KBUILD_MODNAME ": " fmt
+
+#include <asm/kvm_host.h>
+
+#include <xen/xen.h>
+#include <xen/xen-ops.h>
+#include <xen/events.h>
+#include <xen/xenbus.h>
+
+#define BITS_PER_EVTCHN_WORD (sizeof(xen_ulong_t)*8)
+
+static struct kvm_xen shim = { .domid = XEN_SHIM_DOMID };
+
+static void shim_evtchn_setup(struct shared_info *s)
+{
+ int cpu;
+
+ /* Point Xen's shared_info to the domain's sinfo page */
+ HYPERVISOR_shared_info = s;
+
+ /* Evtchns will be marked pending on allocation */
+ memset(s->evtchn_pending, 0, sizeof(s->evtchn_pending));
+ /* ... but we do mask all of -- dom0 expect it. */
+ memset(s->evtchn_mask, 1, sizeof(s->evtchn_mask));
+
+ for_each_possible_cpu(cpu) {
+ struct vcpu_info *vcpu_info;
+ int i;
+
+ /* Direct CPU mapping as far as dom0 is concerned */
+ per_cpu(xen_vcpu_id, cpu) = cpu;
+
+ vcpu_info = &per_cpu(xen_vcpu_info, cpu);
+ memset(vcpu_info, 0, sizeof(*vcpu_info));
+
+ vcpu_info->evtchn_upcall_mask = 0;
+
+ vcpu_info->evtchn_upcall_pending = 0;
+ for (i = 0; i < BITS_PER_EVTCHN_WORD; i++)
+ clear_bit(i, &vcpu_info->evtchn_pending_sel);
+
+ per_cpu(xen_vcpu, cpu) = vcpu_info;
+ }
+}
+
+static int __init shim_register(void)
+{
+ struct shared_info *shinfo;
+
+ shinfo = (struct shared_info *)get_zeroed_page(GFP_KERNEL);
+ if (!shinfo) {
+ pr_err("Failed to allocate shared_info page\n");
+ return -ENOMEM;
+ }
+ shim.shinfo = shinfo;
+
+ idr_init(&shim.port_to_evt);
+ mutex_init(&shim.xen_lock);
+
+ kvm_xen_register_lcall(&shim);
+
+ /* We can handle hypercalls after this point */
+ xen_shim_domain = 1;
+
+ shim_evtchn_setup(shim.shinfo);
+
+ xen_setup_features();
+
+ xen_init_IRQ();
+
+ xenbus_init();
+
+ return 0;
+}
+
+static int __init shim_init(void)
+{
+ if (xen_domain())
+ return -ENODEV;
+
+ return shim_register();
+}
+
+static void __exit shim_exit(void)
+{
+ xenbus_deinit();
+ xen_shim_domain = 0;
+
+ kvm_xen_unregister_lcall();
+ HYPERVISOR_shared_info = NULL;
+ free_page((unsigned long) shim.shinfo);
+ shim.shinfo = NULL;
+}
+
+module_init(shim_init);
+module_exit(shim_exit)
+
+MODULE_AUTHOR("Ankur Arora <ankur.a.arora@oracle.com>,"
+ "Joao Martins <joao.m.martins@oracle.com>");
+MODULE_LICENSE("GPL");
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index b36a10e6b5d7..8d9e93b6eb09 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -57,6 +57,9 @@ EXPORT_PER_CPU_SYMBOL(xen_vcpu_info);
enum xen_domain_type xen_domain_type = XEN_NATIVE;
EXPORT_SYMBOL_GPL(xen_domain_type);
+int xen_shim_domain;
+EXPORT_SYMBOL_GPL(xen_shim_domain);
+
unsigned long *machine_to_phys_mapping = (void *)MACH2PHYS_VIRT_START;
EXPORT_SYMBOL(machine_to_phys_mapping);
unsigned long machine_to_phys_nr;
@@ -349,3 +352,45 @@ void xen_arch_unregister_cpu(int num)
}
EXPORT_SYMBOL(xen_arch_unregister_cpu);
#endif
+
+static struct module *find_module_shim(void)
+{
+ static const char name[] = "xen_shim";
+ struct module *module;
+
+ mutex_lock(&module_mutex);
+ module = find_module(name);
+ mutex_unlock(&module_mutex);
+
+ return module;
+}
+
+bool xen_shim_domain_get(void)
+{
+ struct module *shim;
+
+ if (!xen_shim_domain())
+ return false;
+
+ shim = find_module_shim();
+ if (!shim)
+ return false;
+
+ return try_module_get(shim);
+}
+EXPORT_SYMBOL(xen_shim_domain_get);
+
+void xen_shim_domain_put(void)
+{
+ struct module *shim;
+
+ if (!xen_shim_domain())
+ return;
+
+ shim = find_module_shim();
+ if (!shim)
+ return;
+
+ module_put(shim);
+}
+EXPORT_SYMBOL(xen_shim_domain_put);
diff --git a/drivers/xen/events/events_2l.c b/drivers/xen/events/events_2l.c
index b5acf4b09971..f08d13a033c1 100644
--- a/drivers/xen/events/events_2l.c
+++ b/drivers/xen/events/events_2l.c
@@ -89,7 +89,7 @@ static void evtchn_2l_unmask(unsigned port)
unsigned int cpu = get_cpu();
int do_hypercall = 0, evtchn_pending = 0;
- BUG_ON(!irqs_disabled());
+ WARN_ON(!irqs_disabled());
if (unlikely((cpu != cpu_from_evtchn(port))))
do_hypercall = 1;
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 117e76b2f939..a2087287c3b6 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -1665,7 +1665,7 @@ void xen_callback_vector(void) {}
static bool fifo_events = true;
module_param(fifo_events, bool, 0);
-void __init xen_init_IRQ(void)
+void xen_init_IRQ(void)
{
int ret = -EINVAL;
unsigned int evtchn;
@@ -1683,6 +1683,9 @@ void __init xen_init_IRQ(void)
for (evtchn = 0; evtchn < xen_evtchn_nr_channels(); evtchn++)
mask_evtchn(evtchn);
+ if (xen_shim_domain())
+ return;
+
pirq_needs_eoi = pirq_needs_eoi_flag;
#ifdef CONFIG_X86
@@ -1714,3 +1717,4 @@ void __init xen_init_IRQ(void)
}
#endif
}
+EXPORT_SYMBOL_GPL(xen_init_IRQ);
diff --git a/drivers/xen/features.c b/drivers/xen/features.c
index d7d34fdfc993..1518c3b6f004 100644
--- a/drivers/xen/features.c
+++ b/drivers/xen/features.c
@@ -31,3 +31,4 @@ void xen_setup_features(void)
xen_features[i * 32 + j] = !!(fi.submap & 1<<j);
}
}
+EXPORT_SYMBOL_GPL(xen_setup_features);
diff --git a/drivers/xen/xenbus/xenbus_dev_frontend.c b/drivers/xen/xenbus/xenbus_dev_frontend.c
index c3e201025ef0..a4080d04a01c 100644
--- a/drivers/xen/xenbus/xenbus_dev_frontend.c
+++ b/drivers/xen/xenbus/xenbus_dev_frontend.c
@@ -680,7 +680,7 @@ static struct miscdevice xenbus_dev = {
.fops = &xen_xenbus_fops,
};
-static int __init xenbus_init(void)
+static int __init xenbus_frontend_init(void)
{
int err;
@@ -692,4 +692,4 @@ static int __init xenbus_init(void)
pr_err("Could not register xenbus frontend device\n");
return err;
}
-device_initcall(xenbus_init);
+device_initcall(xenbus_frontend_init);
diff --git a/include/xen/xen.h b/include/xen/xen.h
index 0e2156786ad2..04dfa99e67eb 100644
--- a/include/xen/xen.h
+++ b/include/xen/xen.h
@@ -10,8 +10,12 @@ enum xen_domain_type {
#ifdef CONFIG_XEN
extern enum xen_domain_type xen_domain_type;
+extern int xen_shim_domain;
+extern bool xen_shim_domain_get(void);
+extern void xen_shim_domain_put(void);
#else
#define xen_domain_type XEN_NATIVE
+#define xen_shim_domain 0
#endif
#ifdef CONFIG_XEN_PVH
@@ -24,6 +28,7 @@ extern bool xen_pvh;
#define xen_pv_domain() (xen_domain_type == XEN_PV_DOMAIN)
#define xen_hvm_domain() (xen_domain_type == XEN_HVM_DOMAIN)
#define xen_pvh_domain() (xen_pvh)
+#define xen_shim_domain() (!xen_domain() && xen_shim_domain)
#include <linux/types.h>
diff --git a/include/xen/xenbus.h b/include/xen/xenbus.h
index 869c816d5f8c..d2789e7d2055 100644
--- a/include/xen/xenbus.h
+++ b/include/xen/xenbus.h
@@ -233,4 +233,7 @@ extern const struct file_operations xen_xenbus_fops;
extern struct xenstore_domain_interface *xen_store_interface;
extern int xen_store_evtchn;
+int xenbus_init(void);
+void xenbus_deinit(void);
+
#endif /* _XEN_XENBUS_H */
--
2.11.0
next prev parent reply other threads:[~2019-02-20 20:18 UTC|newest]
Thread overview: 126+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-20 20:15 [PATCH RFC 00/39] x86/KVM: Xen HVM guest support Joao Martins
2019-02-20 20:15 ` [PATCH RFC 01/39] KVM: x86: fix Xen hypercall page msr handling Joao Martins
2019-02-22 1:30 ` Sean Christopherson
2019-02-22 11:47 ` Joao Martins
2019-02-22 12:51 ` Paolo Bonzini
2020-11-30 10:39 ` David Woodhouse
2020-11-30 11:03 ` Paolo Bonzini
2020-11-30 11:27 ` David Woodhouse
2019-02-20 20:15 ` [PATCH RFC 02/39] KVM: x86/xen: intercept xen hypercalls if enabled Joao Martins
2019-02-21 18:29 ` Sean Christopherson
2019-02-21 20:56 ` Joao Martins
2019-02-22 0:30 ` Sean Christopherson
2019-02-22 12:50 ` Paolo Bonzini
2020-12-01 9:48 ` David Woodhouse
2020-12-01 11:19 ` David Woodhouse
2020-12-02 11:17 ` Joao Martins
2020-12-02 12:12 ` David Woodhouse
2020-12-02 5:19 ` Ankur Arora
2020-12-02 8:03 ` David Woodhouse
2020-12-02 18:20 ` Ankur Arora
2019-02-20 20:15 ` [PATCH RFC 03/39] KVM: x86/xen: register shared_info page Joao Martins
2020-12-01 13:07 ` David Woodhouse
2020-12-02 0:40 ` Ankur Arora
2020-12-02 1:26 ` David Woodhouse
2020-12-02 5:17 ` Ankur Arora
2020-12-02 10:50 ` Joao Martins
2020-12-02 10:44 ` Joao Martins
2020-12-02 12:20 ` David Woodhouse
2020-12-02 20:32 ` Ankur Arora
2020-12-03 10:16 ` David Woodhouse
2020-12-04 17:30 ` Sean Christopherson
2020-12-02 20:33 ` Ankur Arora
2020-12-12 12:07 ` David Woodhouse
2019-02-20 20:15 ` [PATCH RFC 04/39] KVM: x86/xen: setup pvclock updates Joao Martins
2019-02-20 20:15 ` [PATCH RFC 05/39] KVM: x86/xen: update wallclock region Joao Martins
2019-02-20 20:15 ` [PATCH RFC 06/39] KVM: x86/xen: register vcpu info Joao Martins
2019-02-20 20:15 ` [PATCH RFC 07/39] KVM: x86/xen: register vcpu time info region Joao Martins
2019-02-20 20:15 ` [PATCH RFC 08/39] KVM: x86/xen: register steal clock Joao Martins
2019-02-20 20:15 ` [PATCH RFC 09/39] KVM: x86: declare Xen HVM guest capability Joao Martins
2019-02-20 20:15 ` [PATCH RFC 10/39] KVM: x86/xen: support upcall vector Joao Martins
2020-12-02 11:17 ` David Woodhouse
2020-12-02 13:12 ` Joao Martins
2020-12-02 16:47 ` David Woodhouse
2020-12-02 18:34 ` Joao Martins
2020-12-02 19:02 ` David Woodhouse
2020-12-02 20:12 ` Joao Martins
2020-12-02 20:37 ` David Woodhouse
2020-12-03 1:08 ` Ankur Arora
2020-12-08 16:08 ` David Woodhouse
2020-12-09 6:35 ` Ankur Arora
2020-12-09 10:27 ` David Woodhouse
2020-12-09 10:51 ` Joao Martins
2020-12-09 11:39 ` David Woodhouse
2020-12-09 13:26 ` Joao Martins
2020-12-09 15:41 ` David Woodhouse
2020-12-09 16:12 ` Joao Martins
2021-01-01 14:33 ` David Woodhouse
2021-01-05 12:11 ` Joao Martins
2021-01-05 13:23 ` David Woodhouse
2019-02-20 20:15 ` [PATCH RFC 11/39] KVM: x86/xen: evtchn signaling via eventfd Joao Martins
2020-11-30 9:41 ` David Woodhouse
2020-11-30 12:17 ` Joao Martins
2020-11-30 12:55 ` David Woodhouse
2020-11-30 15:08 ` Joao Martins
2020-11-30 16:48 ` David Woodhouse
2020-11-30 17:15 ` Joao Martins
2020-11-30 18:01 ` David Woodhouse
2020-11-30 18:41 ` Joao Martins
2020-11-30 19:04 ` David Woodhouse
2020-11-30 19:25 ` Joao Martins
2021-11-23 13:15 ` David Woodhouse
2019-02-20 20:15 ` [PATCH RFC 12/39] KVM: x86/xen: store virq when assigning evtchn Joao Martins
[not found] ` <b750291466f3c89e0a393e48079c087704b217a5.camel@amazon.co.uk>
2022-02-10 12:17 ` Joao Martins
2022-02-10 15:23 ` [EXTERNAL] " David Woodhouse
2019-02-20 20:15 ` [PATCH RFC 13/39] KVM: x86/xen: handle PV timers oneshot mode Joao Martins
2019-02-20 20:15 ` [PATCH RFC 14/39] KVM: x86/xen: handle PV IPI vcpu yield Joao Martins
2019-02-20 20:15 ` [PATCH RFC 15/39] KVM: x86/xen: handle PV spinlocks slowpath Joao Martins
2022-02-08 12:36 ` David Woodhouse
2022-02-10 12:17 ` Joao Martins
2022-02-10 14:11 ` David Woodhouse
2019-02-20 20:15 ` [PATCH RFC 16/39] KVM: x86: declare Xen HVM evtchn offload capability Joao Martins
2019-02-20 20:15 ` [PATCH RFC 17/39] x86/xen: export vcpu_info and shared_info Joao Martins
2019-02-20 20:15 ` [PATCH RFC 18/39] x86/xen: make hypercall_page generic Joao Martins
2019-02-20 20:15 ` [PATCH RFC 19/39] xen/xenbus: xenbus uninit support Joao Martins
2019-02-20 20:15 ` [PATCH RFC 20/39] xen-blkback: module_exit support Joao Martins
2019-02-25 18:57 ` Konrad Rzeszutek Wilk
2019-02-26 11:20 ` Joao Martins
2019-02-20 20:15 ` [PATCH RFC 21/39] KVM: x86/xen: domid allocation Joao Martins
2019-02-20 20:15 ` [PATCH RFC 22/39] KVM: x86/xen: grant table init Joao Martins
2019-02-20 20:15 ` [PATCH RFC 23/39] KVM: x86/xen: grant table grow support Joao Martins
2019-02-20 20:15 ` [PATCH RFC 24/39] KVM: x86/xen: backend hypercall support Joao Martins
2019-02-20 20:15 ` [PATCH RFC 25/39] KVM: x86/xen: grant map support Joao Martins
2019-02-20 20:15 ` [PATCH RFC 26/39] KVM: x86/xen: grant unmap support Joao Martins
2019-02-20 20:15 ` [PATCH RFC 27/39] KVM: x86/xen: grant copy support Joao Martins
2019-02-20 20:15 ` [PATCH RFC 28/39] KVM: x86/xen: interdomain evtchn support Joao Martins
2019-02-20 20:15 ` [PATCH RFC 29/39] KVM: x86/xen: evtchn unmask support Joao Martins
2019-02-20 20:16 ` [PATCH RFC 30/39] KVM: x86/xen: add additional evtchn ops Joao Martins
2019-02-20 20:16 ` Joao Martins [this message]
2019-02-20 20:16 ` [PATCH RFC 32/39] xen/balloon: xen_shim_domain() support Joao Martins
2019-02-20 20:16 ` [PATCH RFC 33/39] xen/grant-table: " Joao Martins
2019-02-20 20:16 ` [PATCH RFC 34/39] xen/gntdev: " Joao Martins
2019-02-20 20:16 ` [PATCH RFC 35/39] xen/xenbus: " Joao Martins
2019-02-20 20:16 ` [PATCH RFC 36/39] drivers/xen: " Joao Martins
2019-02-20 20:16 ` [PATCH RFC 37/39] xen-netback: " Joao Martins
2019-02-20 20:16 ` [PATCH RFC 38/39] xen-blkback: " Joao Martins
2019-02-20 20:16 ` [PATCH RFC 39/39] KVM: x86: declare Xen HVM Dom0 capability Joao Martins
2019-02-20 21:09 ` [PATCH RFC 00/39] x86/KVM: Xen HVM guest support Paolo Bonzini
2019-02-21 0:29 ` Ankur Arora
2019-02-21 11:45 ` Joao Martins
2019-02-22 16:59 ` Paolo Bonzini
2019-03-12 17:14 ` Joao Martins
2019-04-08 6:44 ` Juergen Gross
2019-04-08 10:36 ` Joao Martins
2019-04-08 10:42 ` Juergen Gross
2019-04-08 17:31 ` Joao Martins
2019-04-09 0:35 ` Stefano Stabellini
2019-04-10 5:50 ` [Xen-devel] " Ankur Arora
2019-04-10 20:45 ` Stefano Stabellini
2019-04-09 5:04 ` Juergen Gross
2019-04-10 6:55 ` Ankur Arora
2019-04-10 7:14 ` Juergen Gross
2019-02-20 23:39 ` [Xen-devel] " Marek Marczykowski-Górecki
2019-02-21 0:31 ` Ankur Arora
2019-02-21 7:57 ` Juergen Gross
2019-02-21 12:00 ` Joao Martins
2019-02-21 11:55 ` Joao Martins
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