[PATCH v10 01/17] Xen: ACPI: Hide UART used by Xen

[PATCH v10 01/17] Xen: ACPI: Hide UART used by Xen

[Shannon Zhao]

ACPI 6.0 introduces a new table STAO to list the devices which are used
by Xen and can't be used by Dom0. On Xen virtual platforms, the physical
UART is used by Xen. So here it hides UART from Dom0.

CC: "Rafael J. Wysocki" <rjw@rjwysocki.net> (supporter:ACPI)
CC: Len Brown <lenb@kernel.org> (supporter:ACPI)
CC: linux-acpi@vger.kernel.org (open list:ACPI)
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
---
 drivers/acpi/scan.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 5f28cf7..4d2d9eb 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -45,6 +45,7 @@ static LIST_HEAD(acpi_scan_handlers_list);
 DEFINE_MUTEX(acpi_device_lock);
 LIST_HEAD(acpi_wakeup_device_list);
 static DEFINE_MUTEX(acpi_hp_context_lock);
+static u64 spcr_uart_addr;
 
 struct acpi_dep_data {
 	struct list_head node;
@@ -1453,6 +1454,44 @@ static int acpi_add_single_object(struct acpi_device **child,
 	return 0;
 }
 
+static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
+					    void *context)
+{
+	struct resource *res = context;
+
+	if (acpi_dev_resource_memory(ares, res))
+		return AE_CTRL_TERMINATE;
+
+	return AE_OK;
+}
+
+static bool acpi_device_should_be_hidden(acpi_handle handle)
+{
+	acpi_status status;
+	struct resource res;
+
+	/* Check if it should ignore the UART device */
+	if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
+		return false;
+
+	/*
+	 * The UART device described in SPCR table is assumed to have only one
+	 * memory resource present. So we only look for the first one here.
+	 */
+	status = acpi_walk_resources(handle, METHOD_NAME__CRS,
+				     acpi_get_resource_memory, &res);
+	if (ACPI_FAILURE(status))
+		return false;
+
+	if (res.start == spcr_uart_addr) {
+		printk(KERN_INFO PREFIX "The UART device @%pa in SPCR table will be hidden\n",
+		       &res.start);
+		return true;
+	}
+
+	return false;
+}
+
 static int acpi_bus_type_and_status(acpi_handle handle, int *type,
 				    unsigned long long *sta)
 {
@@ -1466,6 +1505,9 @@ static int acpi_bus_type_and_status(acpi_handle handle, int *type,
 	switch (acpi_type) {
 	case ACPI_TYPE_ANY:		/* for ACPI_ROOT_OBJECT */
 	case ACPI_TYPE_DEVICE:
+		if (acpi_device_should_be_hidden(handle))
+			return -ENODEV;
+
 		*type = ACPI_BUS_TYPE_DEVICE;
 		status = acpi_bus_get_status_handle(handle, sta);
 		if (ACPI_FAILURE(status))
@@ -1916,9 +1958,24 @@ static int acpi_bus_scan_fixed(void)
 	return result < 0 ? result : 0;
 }
 
+static void __init acpi_get_spcr_uart_addr(void)
+{
+	acpi_status status;
+	struct acpi_table_spcr *spcr_ptr;
+
+	status = acpi_get_table(ACPI_SIG_SPCR, 0,
+				(struct acpi_table_header **)&spcr_ptr);
+	if (ACPI_SUCCESS(status))
+		spcr_uart_addr = spcr_ptr->serial_port.address;
+	else
+		printk(KERN_WARNING PREFIX "STAO table present, but SPCR is missing\n");
+}
+
 int __init acpi_scan_init(void)
 {
 	int result;
+	acpi_status status;
+	struct acpi_table_stao *stao_ptr;
 
 	acpi_pci_root_init();
 	acpi_pci_link_init();
@@ -1934,6 +1991,20 @@ int __init acpi_scan_init(void)
 
 	acpi_scan_add_handler(&generic_device_handler);
 
+	/*
+	 * If there is STAO table, check whether it needs to ignore the UART
+	 * device in SPCR table.
+	 */
+	status = acpi_get_table(ACPI_SIG_STAO, 0,
+				(struct acpi_table_header **)&stao_ptr);
+	if (ACPI_SUCCESS(status)) {
+		if (stao_ptr->header.length > sizeof(struct acpi_table_stao))
+			printk(KERN_INFO PREFIX "STAO Name List not yet supported.");
+
+		if (stao_ptr->ignore_uart)
+			acpi_get_spcr_uart_addr();
+	}
+
 	mutex_lock(&acpi_scan_lock);
 	/*
 	 * Enumerate devices in the ACPI namespace.
-- 
2.1.4


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[PATCH v10 02/17] xen/grant-table: Move xlated_setup_gnttab_pages to common place

[Shannon Zhao]

Move xlated_setup_gnttab_pages to common place, so it can be reused by
ARM to setup grant table.

Rename it to xen_xlate_map_ballooned_pages.

Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 arch/x86/xen/grant-table.c | 57 +++++--------------------------------------
 drivers/xen/xlate_mmu.c    | 61 ++++++++++++++++++++++++++++++++++++++++++++++
 include/xen/xen-ops.h      |  2 ++
 3 files changed, 69 insertions(+), 51 deletions(-)

diff --git a/arch/x86/xen/grant-table.c b/arch/x86/xen/grant-table.c
index e079500..de4144c 100644
--- a/arch/x86/xen/grant-table.c
+++ b/arch/x86/xen/grant-table.c
@@ -111,63 +111,18 @@ int arch_gnttab_init(unsigned long nr_shared)
 }
 
 #ifdef CONFIG_XEN_PVH
-#include <xen/balloon.h>
 #include <xen/events.h>
-#include <linux/slab.h>
-static int __init xlated_setup_gnttab_pages(void)
-{
-	struct page **pages;
-	xen_pfn_t *pfns;
-	void *vaddr;
-	int rc;
-	unsigned int i;
-	unsigned long nr_grant_frames = gnttab_max_grant_frames();
-
-	BUG_ON(nr_grant_frames == 0);
-	pages = kcalloc(nr_grant_frames, sizeof(pages[0]), GFP_KERNEL);
-	if (!pages)
-		return -ENOMEM;
-
-	pfns = kcalloc(nr_grant_frames, sizeof(pfns[0]), GFP_KERNEL);
-	if (!pfns) {
-		kfree(pages);
-		return -ENOMEM;
-	}
-	rc = alloc_xenballooned_pages(nr_grant_frames, pages);
-	if (rc) {
-		pr_warn("%s Couldn't balloon alloc %ld pfns rc:%d\n", __func__,
-			nr_grant_frames, rc);
-		kfree(pages);
-		kfree(pfns);
-		return rc;
-	}
-	for (i = 0; i < nr_grant_frames; i++)
-		pfns[i] = page_to_pfn(pages[i]);
-
-	vaddr = vmap(pages, nr_grant_frames, 0, PAGE_KERNEL);
-	if (!vaddr) {
-		pr_warn("%s Couldn't map %ld pfns rc:%d\n", __func__,
-			nr_grant_frames, rc);
-		free_xenballooned_pages(nr_grant_frames, pages);
-		kfree(pages);
-		kfree(pfns);
-		return -ENOMEM;
-	}
-	kfree(pages);
-
-	xen_auto_xlat_grant_frames.pfn = pfns;
-	xen_auto_xlat_grant_frames.count = nr_grant_frames;
-	xen_auto_xlat_grant_frames.vaddr = vaddr;
-
-	return 0;
-}
-
+#include <xen/xen-ops.h>
 static int __init xen_pvh_gnttab_setup(void)
 {
 	if (!xen_pvh_domain())
 		return -ENODEV;
 
-	return xlated_setup_gnttab_pages();
+	xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames();
+
+	return xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn,
+					     &xen_auto_xlat_grant_frames.vaddr,
+					     xen_auto_xlat_grant_frames.count);
 }
 /* Call it _before_ __gnttab_init as we need to initialize the
  * xen_auto_xlat_grant_frames first. */
diff --git a/drivers/xen/xlate_mmu.c b/drivers/xen/xlate_mmu.c
index 5063c5e..9692656 100644
--- a/drivers/xen/xlate_mmu.c
+++ b/drivers/xen/xlate_mmu.c
@@ -29,6 +29,8 @@
  */
 #include <linux/kernel.h>
 #include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
 
 #include <asm/xen/hypercall.h>
 #include <asm/xen/hypervisor.h>
@@ -37,6 +39,7 @@
 #include <xen/page.h>
 #include <xen/interface/xen.h>
 #include <xen/interface/memory.h>
+#include <xen/balloon.h>
 
 typedef void (*xen_gfn_fn_t)(unsigned long gfn, void *data);
 
@@ -185,3 +188,61 @@ int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
 	return 0;
 }
 EXPORT_SYMBOL_GPL(xen_xlate_unmap_gfn_range);
+
+/**
+ * xen_xlate_map_ballooned_pages - map a new set of ballooned pages
+ * @gfns: returns the array of corresponding GFNs
+ * @virt: returns the virtual address of the mapped region
+ * @nr_grant_frames: number of GFNs
+ * @return 0 on success, error otherwise
+ *
+ * This allocates a set of ballooned pages and maps them into the
+ * kernel's address space.
+ */
+int __init xen_xlate_map_ballooned_pages(xen_pfn_t **gfns, void **virt,
+					 unsigned long nr_grant_frames)
+{
+	struct page **pages;
+	xen_pfn_t *pfns;
+	void *vaddr;
+	int rc;
+	unsigned int i;
+
+	BUG_ON(nr_grant_frames == 0);
+	pages = kcalloc(nr_grant_frames, sizeof(pages[0]), GFP_KERNEL);
+	if (!pages)
+		return -ENOMEM;
+
+	pfns = kcalloc(nr_grant_frames, sizeof(pfns[0]), GFP_KERNEL);
+	if (!pfns) {
+		kfree(pages);
+		return -ENOMEM;
+	}
+	rc = alloc_xenballooned_pages(nr_grant_frames, pages);
+	if (rc) {
+		pr_warn("%s Couldn't balloon alloc %ld pfns rc:%d\n", __func__,
+			nr_grant_frames, rc);
+		kfree(pages);
+		kfree(pfns);
+		return rc;
+	}
+	for (i = 0; i < nr_grant_frames; i++)
+		pfns[i] = page_to_pfn(pages[i]);
+
+	vaddr = vmap(pages, nr_grant_frames, 0, PAGE_KERNEL);
+	if (!vaddr) {
+		pr_warn("%s Couldn't map %ld pfns rc:%d\n", __func__,
+			nr_grant_frames, rc);
+		free_xenballooned_pages(nr_grant_frames, pages);
+		kfree(pages);
+		kfree(pfns);
+		return -ENOMEM;
+	}
+	kfree(pages);
+
+	*gfns = pfns;
+	*virt = vaddr;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(xen_xlate_map_ballooned_pages);
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index 86abe07..072be1c 100644
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -85,6 +85,8 @@ int xen_xlate_remap_gfn_array(struct vm_area_struct *vma,
 			      struct page **pages);
 int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
 			      int nr, struct page **pages);
+int xen_xlate_map_ballooned_pages(xen_pfn_t **pfns, void **vaddr,
+				  unsigned long nr_grant_frames);
 
 bool xen_running_on_version_or_later(unsigned int major, unsigned int minor);
 
-- 
2.1.4


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[PATCH v10 03/17] Xen: xlate: Use page_to_xen_pfn instead of page_to_pfn

[Shannon Zhao]

Make xen_xlate_map_ballooned_pages work with 64K pages. In that case
Kernel pages are 64K in size but Xen pages remain 4K in size. Xen pfns
refer to 4K pages.

Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 drivers/xen/xlate_mmu.c | 38 +++++++++++++++++++++++++++-----------
 1 file changed, 27 insertions(+), 11 deletions(-)

diff --git a/drivers/xen/xlate_mmu.c b/drivers/xen/xlate_mmu.c
index 9692656..23f1387 100644
--- a/drivers/xen/xlate_mmu.c
+++ b/drivers/xen/xlate_mmu.c
@@ -189,6 +189,18 @@ int xen_xlate_unmap_gfn_range(struct vm_area_struct *vma,
 }
 EXPORT_SYMBOL_GPL(xen_xlate_unmap_gfn_range);
 
+struct map_balloon_pages {
+	xen_pfn_t *pfns;
+	unsigned int idx;
+};
+
+static void setup_balloon_gfn(unsigned long gfn, void *data)
+{
+	struct map_balloon_pages *info = data;
+
+	info->pfns[info->idx++] = gfn;
+}
+
 /**
  * xen_xlate_map_ballooned_pages - map a new set of ballooned pages
  * @gfns: returns the array of corresponding GFNs
@@ -205,11 +217,13 @@ int __init xen_xlate_map_ballooned_pages(xen_pfn_t **gfns, void **virt,
 	struct page **pages;
 	xen_pfn_t *pfns;
 	void *vaddr;
+	struct map_balloon_pages data;
 	int rc;
-	unsigned int i;
+	unsigned long nr_pages;
 
 	BUG_ON(nr_grant_frames == 0);
-	pages = kcalloc(nr_grant_frames, sizeof(pages[0]), GFP_KERNEL);
+	nr_pages = DIV_ROUND_UP(nr_grant_frames, XEN_PFN_PER_PAGE);
+	pages = kcalloc(nr_pages, sizeof(pages[0]), GFP_KERNEL);
 	if (!pages)
 		return -ENOMEM;
 
@@ -218,22 +232,24 @@ int __init xen_xlate_map_ballooned_pages(xen_pfn_t **gfns, void **virt,
 		kfree(pages);
 		return -ENOMEM;
 	}
-	rc = alloc_xenballooned_pages(nr_grant_frames, pages);
+	rc = alloc_xenballooned_pages(nr_pages, pages);
 	if (rc) {
-		pr_warn("%s Couldn't balloon alloc %ld pfns rc:%d\n", __func__,
-			nr_grant_frames, rc);
+		pr_warn("%s Couldn't balloon alloc %ld pages rc:%d\n", __func__,
+			nr_pages, rc);
 		kfree(pages);
 		kfree(pfns);
 		return rc;
 	}
-	for (i = 0; i < nr_grant_frames; i++)
-		pfns[i] = page_to_pfn(pages[i]);
 
-	vaddr = vmap(pages, nr_grant_frames, 0, PAGE_KERNEL);
+	data.pfns = pfns;
+	data.idx = 0;
+	xen_for_each_gfn(pages, nr_grant_frames, setup_balloon_gfn, &data);
+
+	vaddr = vmap(pages, nr_pages, 0, PAGE_KERNEL);
 	if (!vaddr) {
-		pr_warn("%s Couldn't map %ld pfns rc:%d\n", __func__,
-			nr_grant_frames, rc);
-		free_xenballooned_pages(nr_grant_frames, pages);
+		pr_warn("%s Couldn't map %ld pages rc:%d\n", __func__,
+			nr_pages, rc);
+		free_xenballooned_pages(nr_pages, pages);
 		kfree(pages);
 		kfree(pfns);
 		return -ENOMEM;
-- 
2.1.4


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[PATCH v10 04/17] arm/xen: Use xen_xlate_map_ballooned_pages to setup grant table

[Shannon Zhao]

Use xen_xlate_map_ballooned_pages to setup grant table. Then it doesn't
rely on DT or ACPI to pass the start address and size of grant table.

Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 arch/arm/xen/enlighten.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 75cd734..d94f726 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -282,18 +282,10 @@ static int __init xen_guest_init(void)
 {
 	struct xen_add_to_physmap xatp;
 	struct shared_info *shared_info_page = NULL;
-	struct resource res;
-	phys_addr_t grant_frames;
 
 	if (!xen_domain())
 		return 0;
 
-	if (of_address_to_resource(xen_node, GRANT_TABLE_PHYSADDR, &res)) {
-		pr_err("Xen grant table base address not found\n");
-		return -ENODEV;
-	}
-	grant_frames = res.start;
-
 	xen_events_irq = irq_of_parse_and_map(xen_node, 0);
 	if (!xen_events_irq) {
 		pr_err("Xen event channel interrupt not found\n");
@@ -328,7 +320,10 @@ static int __init xen_guest_init(void)
 	if (xen_vcpu_info == NULL)
 		return -ENOMEM;
 
-	if (gnttab_setup_auto_xlat_frames(grant_frames)) {
+	xen_auto_xlat_grant_frames.count = gnttab_max_grant_frames();
+	if (xen_xlate_map_ballooned_pages(&xen_auto_xlat_grant_frames.pfn,
+					  &xen_auto_xlat_grant_frames.vaddr,
+					  xen_auto_xlat_grant_frames.count)) {
 		free_percpu(xen_vcpu_info);
 		return -ENOMEM;
 	}
-- 
2.1.4


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[PATCH v10 05/17] xen: memory : Add new XENMAPSPACE type XENMAPSPACE_dev_mmio

[Shannon Zhao]

Add a new type of Xen map space for Dom0 to map device's MMIO region.

Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
---
 include/xen/interface/memory.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/xen/interface/memory.h b/include/xen/interface/memory.h
index 2ecfe4f..9aa8988 100644
--- a/include/xen/interface/memory.h
+++ b/include/xen/interface/memory.h
@@ -160,6 +160,7 @@ DEFINE_GUEST_HANDLE_STRUCT(xen_machphys_mapping_t);
 #define XENMAPSPACE_gmfn_foreign 4 /* GMFN from another dom,
 				    * XENMEM_add_to_physmap_range only.
 				    */
+#define XENMAPSPACE_dev_mmio     5 /* device mmio region */
 
 /*
  * Sets the GPFN at which a particular page appears in the specified guest's
-- 
2.1.4


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[PATCH v10 06/17] Xen: ARM: Add support for mapping platform device mmio

[Shannon Zhao]

Add a bus_notifier for platform bus device in order to map the device
mmio regions when DOM0 booting with ACPI.

Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 drivers/xen/Makefile     |   1 +
 drivers/xen/arm-device.c | 141 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 142 insertions(+)
 create mode 100644 drivers/xen/arm-device.c

diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index 9b7a35c..415f286 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -9,6 +9,7 @@ CFLAGS_features.o			:= $(nostackp)
 
 CFLAGS_efi.o				+= -fshort-wchar
 
+dom0-$(CONFIG_ARM64) += arm-device.o
 dom0-$(CONFIG_PCI) += pci.o
 dom0-$(CONFIG_USB_SUPPORT) += dbgp.o
 dom0-$(CONFIG_XEN_ACPI) += acpi.o $(xen-pad-y)
diff --git a/drivers/xen/arm-device.c b/drivers/xen/arm-device.c
new file mode 100644
index 0000000..76e26e5
--- /dev/null
+++ b/drivers/xen/arm-device.c
@@ -0,0 +1,141 @@
+/*
+ * Copyright (c) 2015, Linaro Limited, Shannon Zhao
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/acpi.h>
+#include <xen/xen.h>
+#include <xen/page.h>
+#include <xen/interface/memory.h>
+#include <asm/xen/hypervisor.h>
+#include <asm/xen/hypercall.h>
+
+static int xen_unmap_device_mmio(struct resource *resource, unsigned int count)
+{
+	unsigned int i, j, nr;
+	int rc = 0;
+	struct resource *r;
+	struct xen_remove_from_physmap xrp;
+
+	for (i = 0; i < count; i++) {
+		r = &resource[i];
+		nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE);
+		if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0))
+			continue;
+
+		for (j = 0; j < nr; j++) {
+			xrp.domid = DOMID_SELF;
+			xrp.gpfn = XEN_PFN_DOWN(r->start) + j;
+			rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap,
+						  &xrp);
+			if (rc)
+				return rc;
+		}
+	}
+
+	return rc;
+}
+
+static int xen_map_device_mmio(struct resource *resource, unsigned int count)
+{
+	unsigned int i, j, nr;
+	int rc = 0;
+	struct resource *r;
+	xen_pfn_t *gpfns;
+	xen_ulong_t *idxs;
+	int *errs;
+	struct xen_add_to_physmap_range xatp;
+
+	for (i = 0; i < count; i++) {
+		r = &resource[i];
+		nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE);
+		if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0))
+			continue;
+
+		gpfns = kzalloc(sizeof(xen_pfn_t) * nr, GFP_KERNEL);
+		idxs = kzalloc(sizeof(xen_ulong_t) * nr, GFP_KERNEL);
+		errs = kzalloc(sizeof(int) * nr, GFP_KERNEL);
+		if (!gpfns || !idxs || !errs) {
+			kfree(gpfns);
+			kfree(idxs);
+			kfree(errs);
+			return -ENOMEM;
+		}
+
+		for (j = 0; j < nr; j++) {
+			gpfns[j] = XEN_PFN_DOWN(r->start) + j;
+			idxs[j] = XEN_PFN_DOWN(r->start) + j;
+		}
+
+		xatp.domid = DOMID_SELF;
+		xatp.size = nr;
+		xatp.space = XENMAPSPACE_dev_mmio;
+
+		set_xen_guest_handle(xatp.gpfns, gpfns);
+		set_xen_guest_handle(xatp.idxs, idxs);
+		set_xen_guest_handle(xatp.errs, errs);
+
+		rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
+		kfree(gpfns);
+		kfree(idxs);
+		kfree(errs);
+		if (rc)
+			return rc;
+	}
+
+	return rc;
+}
+
+static int xen_platform_notifier(struct notifier_block *nb,
+				 unsigned long action, void *data)
+{
+	struct platform_device *pdev = to_platform_device(data);
+	int r = 0;
+
+	if (pdev->num_resources == 0 || pdev->resource == NULL)
+		return NOTIFY_OK;
+
+	switch (action) {
+	case BUS_NOTIFY_ADD_DEVICE:
+		r = xen_map_device_mmio(pdev->resource, pdev->num_resources);
+		break;
+	case BUS_NOTIFY_DEL_DEVICE:
+		r = xen_unmap_device_mmio(pdev->resource, pdev->num_resources);
+		break;
+	default:
+		return NOTIFY_DONE;
+	}
+	if (r)
+		dev_err(&pdev->dev, "Platform: Failed to %s device %s MMIO!\n",
+			action == BUS_NOTIFY_ADD_DEVICE ? "map" :
+			(action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"),
+			pdev->name);
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block platform_device_nb = {
+	.notifier_call = xen_platform_notifier,
+};
+
+static int __init register_xen_platform_notifier(void)
+{
+	if (!xen_initial_domain() || acpi_disabled)
+		return 0;
+
+	return bus_register_notifier(&platform_bus_type, &platform_device_nb);
+}
+
+arch_initcall(register_xen_platform_notifier);
-- 
2.1.4


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[PATCH v10 07/17] Xen: ARM: Add support for mapping AMBA device mmio

[Shannon Zhao]

Add a bus_notifier for AMBA bus device in order to map the device
mmio regions when DOM0 booting with ACPI.

Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 drivers/xen/arm-device.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/drivers/xen/arm-device.c b/drivers/xen/arm-device.c
index 76e26e5..3854043 100644
--- a/drivers/xen/arm-device.c
+++ b/drivers/xen/arm-device.c
@@ -139,3 +139,46 @@ static int __init register_xen_platform_notifier(void)
 }
 
 arch_initcall(register_xen_platform_notifier);
+
+#ifdef CONFIG_ARM_AMBA
+#include <linux/amba/bus.h>
+
+static int xen_amba_notifier(struct notifier_block *nb,
+			     unsigned long action, void *data)
+{
+	struct amba_device *adev = to_amba_device(data);
+	int r = 0;
+
+	switch (action) {
+	case BUS_NOTIFY_ADD_DEVICE:
+		r = xen_map_device_mmio(&adev->res, 1);
+		break;
+	case BUS_NOTIFY_DEL_DEVICE:
+		r = xen_unmap_device_mmio(&adev->res, 1);
+		break;
+	default:
+		return NOTIFY_DONE;
+	}
+	if (r)
+		dev_err(&adev->dev, "AMBA: Failed to %s device %s MMIO!\n",
+			action == BUS_NOTIFY_ADD_DEVICE ? "map" :
+			(action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"),
+			adev->dev.init_name);
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block amba_device_nb = {
+	.notifier_call = xen_amba_notifier,
+};
+
+static int __init register_xen_amba_notifier(void)
+{
+	if (!xen_initial_domain() || acpi_disabled)
+		return 0;
+
+	return bus_register_notifier(&amba_bustype, &amba_device_nb);
+}
+
+arch_initcall(register_xen_amba_notifier);
+#endif
-- 
2.1.4


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[PATCH v10 08/17] Xen: public/hvm: sync changes of HVM_PARAM_CALLBACK_VIA ABI from Xen

[Shannon Zhao]

Sync the changes of HVM_PARAM_CALLBACK_VIA ABI introduced by
Xen commit <ca5c54b6ff05> (public/hvm: export the HVM_PARAM_CALLBACK_VIA
ABI in the API).

Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 include/xen/interface/hvm/params.h | 27 +++++++++++++++++++++------
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/include/xen/interface/hvm/params.h b/include/xen/interface/hvm/params.h
index a6c7991..70ad208 100644
--- a/include/xen/interface/hvm/params.h
+++ b/include/xen/interface/hvm/params.h
@@ -27,16 +27,31 @@
  * Parameter space for HVMOP_{set,get}_param.
  */
 
+#define HVM_PARAM_CALLBACK_IRQ 0
 /*
  * How should CPU0 event-channel notifications be delivered?
- * val[63:56] == 0: val[55:0] is a delivery GSI (Global System Interrupt).
- * val[63:56] == 1: val[55:0] is a delivery PCI INTx line, as follows:
- *                  Domain = val[47:32], Bus  = val[31:16],
- *                  DevFn  = val[15: 8], IntX = val[ 1: 0]
- * val[63:56] == 2: val[7:0] is a vector number.
+ *
  * If val == 0 then CPU0 event-channel notifications are not delivered.
+ * If val != 0, val[63:56] encodes the type, as follows:
+ */
+
+#define HVM_PARAM_CALLBACK_TYPE_GSI      0
+/*
+ * val[55:0] is a delivery GSI.  GSI 0 cannot be used, as it aliases val == 0,
+ * and disables all notifications.
+ */
+
+#define HVM_PARAM_CALLBACK_TYPE_PCI_INTX 1
+/*
+ * val[55:0] is a delivery PCI INTx line:
+ * Domain = val[47:32], Bus = val[31:16] DevFn = val[15:8], IntX = val[1:0]
+ */
+
+#define HVM_PARAM_CALLBACK_TYPE_VECTOR   2
+/*
+ * val[7:0] is a vector number.  Check for XENFEAT_hvm_callback_vector to know
+ * if this delivery method is available.
  */
-#define HVM_PARAM_CALLBACK_IRQ 0
 
 #define HVM_PARAM_STORE_PFN    1
 #define HVM_PARAM_STORE_EVTCHN 2
-- 
2.1.4


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[PATCH v10 09/17] xen/hvm/params: Add a new delivery type for event-channel in HVM_PARAM_CALLBACK_IRQ

[Shannon Zhao]

This new delivery type which is for ARM shares the same value with
HVM_PARAM_CALLBACK_TYPE_VECTOR which is for x86.

val[15:8] is flag: val[7:0] is a PPI.
To the flag, bit 8 stands the interrupt mode is edge(1) or level(0) and
bit 9 stands the interrupt polarity is active low(1) or high(0).

Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 include/xen/interface/hvm/params.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/xen/interface/hvm/params.h b/include/xen/interface/hvm/params.h
index 70ad208..4d61fc5 100644
--- a/include/xen/interface/hvm/params.h
+++ b/include/xen/interface/hvm/params.h
@@ -47,11 +47,24 @@
  * Domain = val[47:32], Bus = val[31:16] DevFn = val[15:8], IntX = val[1:0]
  */
 
+#if defined(__i386__) || defined(__x86_64__)
 #define HVM_PARAM_CALLBACK_TYPE_VECTOR   2
 /*
  * val[7:0] is a vector number.  Check for XENFEAT_hvm_callback_vector to know
  * if this delivery method is available.
  */
+#elif defined(__arm__) || defined(__aarch64__)
+#define HVM_PARAM_CALLBACK_TYPE_PPI      2
+/*
+ * val[55:16] needs to be zero.
+ * val[15:8] is interrupt flag of the PPI used by event-channel:
+ *  bit 8: the PPI is edge(1) or level(0) triggered
+ *  bit 9: the PPI is active low(1) or high(0)
+ * val[7:0] is a PPI number used by event-channel.
+ * This is only used by ARM/ARM64 and masking/eoi the interrupt associated to
+ * the notification is handled by the interrupt controller.
+ */
+#endif
 
 #define HVM_PARAM_STORE_PFN    1
 #define HVM_PARAM_STORE_EVTCHN 2
-- 
2.1.4


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[PATCH v10 10/17] arm/xen: Get event-channel irq through HVM_PARAM when booting with ACPI

[Shannon Zhao]

The kernel will get the event-channel IRQ through
HVM_PARAM_CALLBACK_IRQ.

Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 arch/arm/xen/enlighten.c | 36 +++++++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index d94f726..06bd61a 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -30,6 +30,7 @@
 #include <linux/time64.h>
 #include <linux/timekeeping.h>
 #include <linux/timekeeper_internal.h>
+#include <linux/acpi.h>
 
 #include <linux/mm.h>
 
@@ -278,6 +279,35 @@ void __init xen_early_init(void)
 		add_preferred_console("hvc", 0, NULL);
 }
 
+static void __init xen_acpi_guest_init(void)
+{
+#ifdef CONFIG_ACPI
+	struct xen_hvm_param a;
+	int interrupt, trigger, polarity;
+
+	a.domid = DOMID_SELF;
+	a.index = HVM_PARAM_CALLBACK_IRQ;
+
+	if (HYPERVISOR_hvm_op(HVMOP_get_param, &a)
+	    || (a.value >> 56) != HVM_PARAM_CALLBACK_TYPE_PPI) {
+		xen_events_irq = 0;
+		return;
+	}
+
+	interrupt = a.value & 0xff;
+	trigger = ((a.value >> 8) & 0x1) ? ACPI_EDGE_SENSITIVE
+					 : ACPI_LEVEL_SENSITIVE;
+	polarity = ((a.value >> 8) & 0x2) ? ACPI_ACTIVE_LOW
+					  : ACPI_ACTIVE_HIGH;
+	xen_events_irq = acpi_register_gsi(NULL, interrupt, trigger, polarity);
+#endif
+}
+
+static void __init xen_dt_guest_init(void)
+{
+	xen_events_irq = irq_of_parse_and_map(xen_node, 0);
+}
+
 static int __init xen_guest_init(void)
 {
 	struct xen_add_to_physmap xatp;
@@ -286,7 +316,11 @@ static int __init xen_guest_init(void)
 	if (!xen_domain())
 		return 0;
 
-	xen_events_irq = irq_of_parse_and_map(xen_node, 0);
+	if (!acpi_disabled)
+		xen_acpi_guest_init();
+	else
+		xen_dt_guest_init();
+
 	if (!xen_events_irq) {
 		pr_err("Xen event channel interrupt not found\n");
 		return -ENODEV;
-- 
2.1.4


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[PATCH v10 11/17] ARM: XEN: Move xen_early_init() before efi_init()

[Shannon Zhao]

Move xen_early_init() before efi_init(), then when calling efi_init()
could initialize Xen specific UEFI.

Check if it runs on Xen hypervisor through the flat dts.

Cc: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 arch/arm/kernel/setup.c   |  2 +-
 arch/arm/xen/enlighten.c  | 56 ++++++++++++++++++++++++++++++++++-------------
 arch/arm64/kernel/setup.c |  2 +-
 3 files changed, 43 insertions(+), 17 deletions(-)

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 139791e..5bc7516 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -1035,6 +1035,7 @@ void __init setup_arch(char **cmdline_p)
 	early_paging_init(mdesc);
 #endif
 	setup_dma_zone(mdesc);
+	xen_early_init();
 	efi_init();
 	sanity_check_meminfo();
 	arm_memblock_init(mdesc);
@@ -1051,7 +1052,6 @@ void __init setup_arch(char **cmdline_p)
 
 	arm_dt_init_cpu_maps();
 	psci_dt_init();
-	xen_early_init();
 #ifdef CONFIG_SMP
 	if (is_smp()) {
 		if (!mdesc->smp_init || !mdesc->smp_init()) {
diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 06bd61a..13e3e9f 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -20,6 +20,7 @@
 #include <linux/irqreturn.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/of_fdt.h>
 #include <linux/of_irq.h>
 #include <linux/of_address.h>
 #include <linux/cpuidle.h>
@@ -53,8 +54,6 @@ struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS] __initdata;
 
 static __read_mostly unsigned int xen_events_irq;
 
-static __initdata struct device_node *xen_node;
-
 int xen_remap_domain_gfn_array(struct vm_area_struct *vma,
 			       unsigned long addr,
 			       xen_pfn_t *gfn, int nr,
@@ -238,6 +237,33 @@ static irqreturn_t xen_arm_callback(int irq, void *arg)
 	return IRQ_HANDLED;
 }
 
+static __initdata struct {
+	const char *compat;
+	const char *prefix;
+	const char *version;
+	bool found;
+} hyper_node = {"xen,xen", "xen,xen-", NULL, false};
+
+static int __init fdt_find_hyper_node(unsigned long node, const char *uname,
+				      int depth, void *data)
+{
+	const void *s = NULL;
+	int len;
+
+	if (depth != 1 || strcmp(uname, "hypervisor") != 0)
+		return 0;
+
+	if (of_flat_dt_is_compatible(node, hyper_node.compat))
+		hyper_node.found = true;
+
+	s = of_get_flat_dt_prop(node, "compatible", &len);
+	if (strlen(hyper_node.prefix) + 3  < len &&
+	    !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix)))
+		hyper_node.version = s + strlen(hyper_node.prefix);
+
+	return 0;
+}
+
 /*
  * see Documentation/devicetree/bindings/arm/xen.txt for the
  * documentation of the Xen Device Tree format.
@@ -245,26 +271,18 @@ static irqreturn_t xen_arm_callback(int irq, void *arg)
 #define GRANT_TABLE_PHYSADDR 0
 void __init xen_early_init(void)
 {
-	int len;
-	const char *s = NULL;
-	const char *version = NULL;
-	const char *xen_prefix = "xen,xen-";
-
-	xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
-	if (!xen_node) {
+	of_scan_flat_dt(fdt_find_hyper_node, NULL);
+	if (!hyper_node.found) {
 		pr_debug("No Xen support\n");
 		return;
 	}
-	s = of_get_property(xen_node, "compatible", &len);
-	if (strlen(xen_prefix) + 3  < len &&
-			!strncmp(xen_prefix, s, strlen(xen_prefix)))
-		version = s + strlen(xen_prefix);
-	if (version == NULL) {
+
+	if (hyper_node.version == NULL) {
 		pr_debug("Xen version not found\n");
 		return;
 	}
 
-	pr_info("Xen %s support found\n", version);
+	pr_info("Xen %s support found\n", hyper_node.version);
 
 	xen_domain_type = XEN_HVM_DOMAIN;
 
@@ -305,6 +323,14 @@ static void __init xen_acpi_guest_init(void)
 
 static void __init xen_dt_guest_init(void)
 {
+	struct device_node *xen_node;
+
+	xen_node = of_find_compatible_node(NULL, NULL, "xen,xen");
+	if (!xen_node) {
+		pr_err("Xen support was detected before, but it has disappeared\n");
+		return;
+	}
+
 	xen_events_irq = irq_of_parse_and_map(xen_node, 0);
 }
 
diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index 9dc6776..7cf992f 100644
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -320,6 +320,7 @@ void __init setup_arch(char **cmdline_p)
 	 */
 	cpu_uninstall_idmap();
 
+	xen_early_init();
 	efi_init();
 	arm64_memblock_init();
 
@@ -341,7 +342,6 @@ void __init setup_arch(char **cmdline_p)
 	} else {
 		psci_acpi_init();
 	}
-	xen_early_init();
 
 	cpu_read_bootcpu_ops();
 	smp_init_cpus();
-- 
2.1.4


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[PATCH v10 12/17] ARM64: ACPI: Check if it runs on Xen to enable or disable ACPI

[Shannon Zhao]

When it's a Xen domain0 booting with ACPI, it will supply a /chosen and
a /hypervisor node in DT. So check if it needs to enable ACPI.

Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Hanjun Guo <hanjun.guo@linaro.org>
---
 arch/arm64/kernel/acpi.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c
index d1ce8e2..57ee317 100644
--- a/arch/arm64/kernel/acpi.c
+++ b/arch/arm64/kernel/acpi.c
@@ -67,10 +67,15 @@ static int __init dt_scan_depth1_nodes(unsigned long node,
 {
 	/*
 	 * Return 1 as soon as we encounter a node at depth 1 that is
-	 * not the /chosen node.
+	 * not the /chosen node, or /hypervisor node with compatible
+	 * string "xen,xen".
 	 */
-	if (depth == 1 && (strcmp(uname, "chosen") != 0))
-		return 1;
+	if (depth == 1 && (strcmp(uname, "chosen") != 0)) {
+		if (strcmp(uname, "hypervisor") != 0 ||
+		    !of_flat_dt_is_compatible(node, "xen,xen"))
+			return 1;
+	}
+
 	return 0;
 }
 
@@ -184,7 +189,8 @@ void __init acpi_boot_table_init(void)
 	/*
 	 * Enable ACPI instead of device tree unless
 	 * - ACPI has been disabled explicitly (acpi=off), or
-	 * - the device tree is not empty (it has more than just a /chosen node)
+	 * - the device tree is not empty (it has more than just a /chosen node,
+	 *   and a /hypervisor node when running on Xen)
 	 *   and ACPI has not been force enabled (acpi=force)
 	 */
 	if (param_acpi_off ||
-- 
2.1.4


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[PATCH v10 13/17] ARM: Xen: Document UEFI support on Xen ARM virtual platforms

[Shannon Zhao]

Add a "uefi" node under /hypervisor node in FDT, then Linux kernel could
scan this to get the UEFI information.

CC: Rob Herring <robh@kernel.org>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 Documentation/devicetree/bindings/arm/xen.txt | 35 +++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/xen.txt b/Documentation/devicetree/bindings/arm/xen.txt
index 0f7b9c2..c9b9321 100644
--- a/Documentation/devicetree/bindings/arm/xen.txt
+++ b/Documentation/devicetree/bindings/arm/xen.txt
@@ -11,10 +11,32 @@ the following properties:
   memory where the grant table should be mapped to, using an
   HYPERVISOR_memory_op hypercall. The memory region is large enough to map
   the whole grant table (it is larger or equal to gnttab_max_grant_frames()).
+  This property is unnecessary when booting Dom0 using ACPI.
 
 - interrupts: the interrupt used by Xen to inject event notifications.
   A GIC node is also required.
+  This property is unnecessary when booting Dom0 using ACPI.
 
+To support UEFI on Xen ARM virtual platforms, Xen populates the FDT "uefi" node
+under /hypervisor with following parameters:
+
+________________________________________________________________________________
+Name                      | Size   | Description
+================================================================================
+xen,uefi-system-table     | 64-bit | Guest physical address of the UEFI System
+			  |	   | Table.
+--------------------------------------------------------------------------------
+xen,uefi-mmap-start       | 64-bit | Guest physical address of the UEFI memory
+			  |	   | map.
+--------------------------------------------------------------------------------
+xen,uefi-mmap-size        | 32-bit | Size in bytes of the UEFI memory map
+                          |        | pointed to in previous entry.
+--------------------------------------------------------------------------------
+xen,uefi-mmap-desc-size   | 32-bit | Size in bytes of each entry in the UEFI
+                          |        | memory map.
+--------------------------------------------------------------------------------
+xen,uefi-mmap-desc-ver    | 32-bit | Version of the mmap descriptor format.
+--------------------------------------------------------------------------------
 
 Example (assuming #address-cells = <2> and #size-cells = <2>):
 
@@ -22,4 +44,17 @@ hypervisor {
 	compatible = "xen,xen-4.3", "xen,xen";
 	reg = <0 0xb0000000 0 0x20000>;
 	interrupts = <1 15 0xf08>;
+	uefi {
+		xen,uefi-system-table = <0xXXXXXXXX>;
+		xen,uefi-mmap-start = <0xXXXXXXXX>;
+		xen,uefi-mmap-size = <0xXXXXXXXX>;
+		xen,uefi-mmap-desc-size = <0xXXXXXXXX>;
+		xen,uefi-mmap-desc-ver = <0xXXXXXXXX>;
+        };
 };
+
+The format and meaning of the "xen,uefi-*" parameters are similar to those in
+Documentation/arm/uefi.txt, which are provided by the regular UEFI stub. However
+they differ because they are provided by the Xen hypervisor, together with a set
+of UEFI runtime services implemented via hypercalls, see
+http://xenbits.xen.org/docs/unstable/hypercall/x86_64/include,public,platform.h.html.
-- 
2.1.4


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[PATCH v10 14/17] XEN: EFI: Move x86 specific codes to architecture directory

[Shannon Zhao]

Move x86 specific codes to architecture directory and export those EFI
runtime service functions. This will be useful for initializing runtime
service on ARM later.

Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 arch/x86/xen/efi.c    | 112 ++++++++++++++++++++++++++++++++
 drivers/xen/efi.c     | 174 ++++++++++----------------------------------------
 include/xen/xen-ops.h |  30 ++++++---
 3 files changed, 168 insertions(+), 148 deletions(-)

diff --git a/arch/x86/xen/efi.c b/arch/x86/xen/efi.c
index be14cc3..86527f1 100644
--- a/arch/x86/xen/efi.c
+++ b/arch/x86/xen/efi.c
@@ -20,10 +20,122 @@
 #include <linux/init.h>
 #include <linux/string.h>
 
+#include <xen/xen.h>
 #include <xen/xen-ops.h>
+#include <xen/interface/platform.h>
 
 #include <asm/page.h>
 #include <asm/setup.h>
+#include <asm/xen/hypercall.h>
+
+static efi_char16_t vendor[100] __initdata;
+
+static efi_system_table_t efi_systab_xen __initdata = {
+	.hdr = {
+		.signature	= EFI_SYSTEM_TABLE_SIGNATURE,
+		.revision	= 0, /* Initialized later. */
+		.headersize	= 0, /* Ignored by Linux Kernel. */
+		.crc32		= 0, /* Ignored by Linux Kernel. */
+		.reserved	= 0
+	},
+	.fw_vendor	= EFI_INVALID_TABLE_ADDR, /* Initialized later. */
+	.fw_revision	= 0,			  /* Initialized later. */
+	.con_in_handle	= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
+	.con_in		= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
+	.con_out_handle	= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
+	.con_out	= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
+	.stderr_handle	= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
+	.stderr		= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
+	.runtime	= (efi_runtime_services_t *)EFI_INVALID_TABLE_ADDR,
+						  /* Not used under Xen. */
+	.boottime	= (efi_boot_services_t *)EFI_INVALID_TABLE_ADDR,
+						  /* Not used under Xen. */
+	.nr_tables	= 0,			  /* Initialized later. */
+	.tables		= EFI_INVALID_TABLE_ADDR  /* Initialized later. */
+};
+
+static const struct efi efi_xen __initconst = {
+	.systab                   = NULL, /* Initialized later. */
+	.runtime_version	  = 0,    /* Initialized later. */
+	.mps                      = EFI_INVALID_TABLE_ADDR,
+	.acpi                     = EFI_INVALID_TABLE_ADDR,
+	.acpi20                   = EFI_INVALID_TABLE_ADDR,
+	.smbios                   = EFI_INVALID_TABLE_ADDR,
+	.smbios3                  = EFI_INVALID_TABLE_ADDR,
+	.sal_systab               = EFI_INVALID_TABLE_ADDR,
+	.boot_info                = EFI_INVALID_TABLE_ADDR,
+	.hcdp                     = EFI_INVALID_TABLE_ADDR,
+	.uga                      = EFI_INVALID_TABLE_ADDR,
+	.uv_systab                = EFI_INVALID_TABLE_ADDR,
+	.fw_vendor                = EFI_INVALID_TABLE_ADDR,
+	.runtime                  = EFI_INVALID_TABLE_ADDR,
+	.config_table             = EFI_INVALID_TABLE_ADDR,
+	.get_time                 = xen_efi_get_time,
+	.set_time                 = xen_efi_set_time,
+	.get_wakeup_time          = xen_efi_get_wakeup_time,
+	.set_wakeup_time          = xen_efi_set_wakeup_time,
+	.get_variable             = xen_efi_get_variable,
+	.get_next_variable        = xen_efi_get_next_variable,
+	.set_variable             = xen_efi_set_variable,
+	.query_variable_info      = xen_efi_query_variable_info,
+	.update_capsule           = xen_efi_update_capsule,
+	.query_capsule_caps       = xen_efi_query_capsule_caps,
+	.get_next_high_mono_count = xen_efi_get_next_high_mono_count,
+	.reset_system             = NULL, /* Functionality provided by Xen. */
+	.set_virtual_address_map  = NULL, /* Not used under Xen. */
+	.memmap                   = NULL, /* Not used under Xen. */
+	.flags			  = 0     /* Initialized later. */
+};
+
+static efi_system_table_t __init *xen_efi_probe(void)
+{
+	struct xen_platform_op op = {
+		.cmd = XENPF_firmware_info,
+		.u.firmware_info = {
+			.type = XEN_FW_EFI_INFO,
+			.index = XEN_FW_EFI_CONFIG_TABLE
+		}
+	};
+	union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;
+
+	if (!xen_initial_domain() || HYPERVISOR_platform_op(&op) < 0)
+		return NULL;
+
+	/* Here we know that Xen runs on EFI platform. */
+
+	efi = efi_xen;
+
+	efi_systab_xen.tables = info->cfg.addr;
+	efi_systab_xen.nr_tables = info->cfg.nent;
+
+	op.cmd = XENPF_firmware_info;
+	op.u.firmware_info.type = XEN_FW_EFI_INFO;
+	op.u.firmware_info.index = XEN_FW_EFI_VENDOR;
+	info->vendor.bufsz = sizeof(vendor);
+	set_xen_guest_handle(info->vendor.name, vendor);
+
+	if (HYPERVISOR_platform_op(&op) == 0) {
+		efi_systab_xen.fw_vendor = __pa_symbol(vendor);
+		efi_systab_xen.fw_revision = info->vendor.revision;
+	} else
+		efi_systab_xen.fw_vendor = __pa_symbol(L"UNKNOWN");
+
+	op.cmd = XENPF_firmware_info;
+	op.u.firmware_info.type = XEN_FW_EFI_INFO;
+	op.u.firmware_info.index = XEN_FW_EFI_VERSION;
+
+	if (HYPERVISOR_platform_op(&op) == 0)
+		efi_systab_xen.hdr.revision = info->version;
+
+	op.cmd = XENPF_firmware_info;
+	op.u.firmware_info.type = XEN_FW_EFI_INFO;
+	op.u.firmware_info.index = XEN_FW_EFI_RT_VERSION;
+
+	if (HYPERVISOR_platform_op(&op) == 0)
+		efi.runtime_version = info->version;
+
+	return &efi_systab_xen;
+}
 
 void __init xen_efi_init(void)
 {
diff --git a/drivers/xen/efi.c b/drivers/xen/efi.c
index be7e56a..22f71ff 100644
--- a/drivers/xen/efi.c
+++ b/drivers/xen/efi.c
@@ -38,7 +38,7 @@
 
 #define efi_data(op)	(op.u.efi_runtime_call)
 
-static efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
+efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
 {
 	struct xen_platform_op op = INIT_EFI_OP(get_time);
 
@@ -59,8 +59,9 @@ static efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc)
 
 	return efi_data(op).status;
 }
+EXPORT_SYMBOL_GPL(xen_efi_get_time);
 
-static efi_status_t xen_efi_set_time(efi_time_t *tm)
+efi_status_t xen_efi_set_time(efi_time_t *tm)
 {
 	struct xen_platform_op op = INIT_EFI_OP(set_time);
 
@@ -72,10 +73,10 @@ static efi_status_t xen_efi_set_time(efi_time_t *tm)
 
 	return efi_data(op).status;
 }
+EXPORT_SYMBOL_GPL(xen_efi_set_time);
 
-static efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled,
-					    efi_bool_t *pending,
-					    efi_time_t *tm)
+efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled, efi_bool_t *pending,
+				     efi_time_t *tm)
 {
 	struct xen_platform_op op = INIT_EFI_OP(get_wakeup_time);
 
@@ -95,8 +96,9 @@ static efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled,
 
 	return efi_data(op).status;
 }
+EXPORT_SYMBOL_GPL(xen_efi_get_wakeup_time);
 
-static efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
+efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
 {
 	struct xen_platform_op op = INIT_EFI_OP(set_wakeup_time);
 
@@ -113,12 +115,11 @@ static efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm)
 
 	return efi_data(op).status;
 }
+EXPORT_SYMBOL_GPL(xen_efi_set_wakeup_time);
 
-static efi_status_t xen_efi_get_variable(efi_char16_t *name,
-					 efi_guid_t *vendor,
-					 u32 *attr,
-					 unsigned long *data_size,
-					 void *data)
+efi_status_t xen_efi_get_variable(efi_char16_t *name, efi_guid_t *vendor,
+				  u32 *attr, unsigned long *data_size,
+				  void *data)
 {
 	struct xen_platform_op op = INIT_EFI_OP(get_variable);
 
@@ -138,10 +139,11 @@ static efi_status_t xen_efi_get_variable(efi_char16_t *name,
 
 	return efi_data(op).status;
 }
+EXPORT_SYMBOL_GPL(xen_efi_get_variable);
 
-static efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
-					      efi_char16_t *name,
-					      efi_guid_t *vendor)
+efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
+				       efi_char16_t *name,
+				       efi_guid_t *vendor)
 {
 	struct xen_platform_op op = INIT_EFI_OP(get_next_variable_name);
 
@@ -161,12 +163,11 @@ static efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
 
 	return efi_data(op).status;
 }
+EXPORT_SYMBOL_GPL(xen_efi_get_next_variable);
 
-static efi_status_t xen_efi_set_variable(efi_char16_t *name,
-					 efi_guid_t *vendor,
-					 u32 attr,
-					 unsigned long data_size,
-					 void *data)
+efi_status_t xen_efi_set_variable(efi_char16_t *name, efi_guid_t *vendor,
+				 u32 attr, unsigned long data_size,
+				 void *data)
 {
 	struct xen_platform_op op = INIT_EFI_OP(set_variable);
 
@@ -183,11 +184,11 @@ static efi_status_t xen_efi_set_variable(efi_char16_t *name,
 
 	return efi_data(op).status;
 }
+EXPORT_SYMBOL_GPL(xen_efi_set_variable);
 
-static efi_status_t xen_efi_query_variable_info(u32 attr,
-						u64 *storage_space,
-						u64 *remaining_space,
-						u64 *max_variable_size)
+efi_status_t xen_efi_query_variable_info(u32 attr, u64 *storage_space,
+					 u64 *remaining_space,
+					 u64 *max_variable_size)
 {
 	struct xen_platform_op op = INIT_EFI_OP(query_variable_info);
 
@@ -205,8 +206,9 @@ static efi_status_t xen_efi_query_variable_info(u32 attr,
 
 	return efi_data(op).status;
 }
+EXPORT_SYMBOL_GPL(xen_efi_query_variable_info);
 
-static efi_status_t xen_efi_get_next_high_mono_count(u32 *count)
+efi_status_t xen_efi_get_next_high_mono_count(u32 *count)
 {
 	struct xen_platform_op op = INIT_EFI_OP(get_next_high_monotonic_count);
 
@@ -217,10 +219,10 @@ static efi_status_t xen_efi_get_next_high_mono_count(u32 *count)
 
 	return efi_data(op).status;
 }
+EXPORT_SYMBOL_GPL(xen_efi_get_next_high_mono_count);
 
-static efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
-					   unsigned long count,
-					   unsigned long sg_list)
+efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
+				    unsigned long count, unsigned long sg_list)
 {
 	struct xen_platform_op op = INIT_EFI_OP(update_capsule);
 
@@ -237,11 +239,11 @@ static efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
 
 	return efi_data(op).status;
 }
+EXPORT_SYMBOL_GPL(xen_efi_update_capsule);
 
-static efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
-					       unsigned long count,
-					       u64 *max_size,
-					       int *reset_type)
+efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
+					unsigned long count, u64 *max_size,
+					int *reset_type)
 {
 	struct xen_platform_op op = INIT_EFI_OP(query_capsule_capabilities);
 
@@ -260,112 +262,4 @@ static efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
 
 	return efi_data(op).status;
 }
-
-static efi_char16_t vendor[100] __initdata;
-
-static efi_system_table_t efi_systab_xen __initdata = {
-	.hdr = {
-		.signature	= EFI_SYSTEM_TABLE_SIGNATURE,
-		.revision	= 0, /* Initialized later. */
-		.headersize	= 0, /* Ignored by Linux Kernel. */
-		.crc32		= 0, /* Ignored by Linux Kernel. */
-		.reserved	= 0
-	},
-	.fw_vendor	= EFI_INVALID_TABLE_ADDR, /* Initialized later. */
-	.fw_revision	= 0,			  /* Initialized later. */
-	.con_in_handle	= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
-	.con_in		= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
-	.con_out_handle	= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
-	.con_out	= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
-	.stderr_handle	= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
-	.stderr		= EFI_INVALID_TABLE_ADDR, /* Not used under Xen. */
-	.runtime	= (efi_runtime_services_t *)EFI_INVALID_TABLE_ADDR,
-						  /* Not used under Xen. */
-	.boottime	= (efi_boot_services_t *)EFI_INVALID_TABLE_ADDR,
-						  /* Not used under Xen. */
-	.nr_tables	= 0,			  /* Initialized later. */
-	.tables		= EFI_INVALID_TABLE_ADDR  /* Initialized later. */
-};
-
-static const struct efi efi_xen __initconst = {
-	.systab                   = NULL, /* Initialized later. */
-	.runtime_version	  = 0,    /* Initialized later. */
-	.mps                      = EFI_INVALID_TABLE_ADDR,
-	.acpi                     = EFI_INVALID_TABLE_ADDR,
-	.acpi20                   = EFI_INVALID_TABLE_ADDR,
-	.smbios                   = EFI_INVALID_TABLE_ADDR,
-	.smbios3                  = EFI_INVALID_TABLE_ADDR,
-	.sal_systab               = EFI_INVALID_TABLE_ADDR,
-	.boot_info                = EFI_INVALID_TABLE_ADDR,
-	.hcdp                     = EFI_INVALID_TABLE_ADDR,
-	.uga                      = EFI_INVALID_TABLE_ADDR,
-	.uv_systab                = EFI_INVALID_TABLE_ADDR,
-	.fw_vendor                = EFI_INVALID_TABLE_ADDR,
-	.runtime                  = EFI_INVALID_TABLE_ADDR,
-	.config_table             = EFI_INVALID_TABLE_ADDR,
-	.get_time                 = xen_efi_get_time,
-	.set_time                 = xen_efi_set_time,
-	.get_wakeup_time          = xen_efi_get_wakeup_time,
-	.set_wakeup_time          = xen_efi_set_wakeup_time,
-	.get_variable             = xen_efi_get_variable,
-	.get_next_variable        = xen_efi_get_next_variable,
-	.set_variable             = xen_efi_set_variable,
-	.query_variable_info      = xen_efi_query_variable_info,
-	.update_capsule           = xen_efi_update_capsule,
-	.query_capsule_caps       = xen_efi_query_capsule_caps,
-	.get_next_high_mono_count = xen_efi_get_next_high_mono_count,
-	.reset_system             = NULL, /* Functionality provided by Xen. */
-	.set_virtual_address_map  = NULL, /* Not used under Xen. */
-	.memmap                   = NULL, /* Not used under Xen. */
-	.flags			  = 0     /* Initialized later. */
-};
-
-efi_system_table_t __init *xen_efi_probe(void)
-{
-	struct xen_platform_op op = {
-		.cmd = XENPF_firmware_info,
-		.u.firmware_info = {
-			.type = XEN_FW_EFI_INFO,
-			.index = XEN_FW_EFI_CONFIG_TABLE
-		}
-	};
-	union xenpf_efi_info *info = &op.u.firmware_info.u.efi_info;
-
-	if (!xen_initial_domain() || HYPERVISOR_platform_op(&op) < 0)
-		return NULL;
-
-	/* Here we know that Xen runs on EFI platform. */
-
-	efi = efi_xen;
-
-	efi_systab_xen.tables = info->cfg.addr;
-	efi_systab_xen.nr_tables = info->cfg.nent;
-
-	op.cmd = XENPF_firmware_info;
-	op.u.firmware_info.type = XEN_FW_EFI_INFO;
-	op.u.firmware_info.index = XEN_FW_EFI_VENDOR;
-	info->vendor.bufsz = sizeof(vendor);
-	set_xen_guest_handle(info->vendor.name, vendor);
-
-	if (HYPERVISOR_platform_op(&op) == 0) {
-		efi_systab_xen.fw_vendor = __pa_symbol(vendor);
-		efi_systab_xen.fw_revision = info->vendor.revision;
-	} else
-		efi_systab_xen.fw_vendor = __pa_symbol(L"UNKNOWN");
-
-	op.cmd = XENPF_firmware_info;
-	op.u.firmware_info.type = XEN_FW_EFI_INFO;
-	op.u.firmware_info.index = XEN_FW_EFI_VERSION;
-
-	if (HYPERVISOR_platform_op(&op) == 0)
-		efi_systab_xen.hdr.revision = info->version;
-
-	op.cmd = XENPF_firmware_info;
-	op.u.firmware_info.type = XEN_FW_EFI_INFO;
-	op.u.firmware_info.index = XEN_FW_EFI_RT_VERSION;
-
-	if (HYPERVISOR_platform_op(&op) == 0)
-		efi.runtime_version = info->version;
-
-	return &efi_systab_xen;
-}
+EXPORT_SYMBOL_GPL(xen_efi_query_capsule_caps);
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index 072be1c..3491582 100644
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -90,14 +90,28 @@ int xen_xlate_map_ballooned_pages(xen_pfn_t **pfns, void **vaddr,
 
 bool xen_running_on_version_or_later(unsigned int major, unsigned int minor);
 
-#ifdef CONFIG_XEN_EFI
-extern efi_system_table_t *xen_efi_probe(void);
-#else
-static inline efi_system_table_t __init *xen_efi_probe(void)
-{
-	return NULL;
-}
-#endif
+efi_status_t xen_efi_get_time(efi_time_t *tm, efi_time_cap_t *tc);
+efi_status_t xen_efi_set_time(efi_time_t *tm);
+efi_status_t xen_efi_get_wakeup_time(efi_bool_t *enabled, efi_bool_t *pending,
+				     efi_time_t *tm);
+efi_status_t xen_efi_set_wakeup_time(efi_bool_t enabled, efi_time_t *tm);
+efi_status_t xen_efi_get_variable(efi_char16_t *name, efi_guid_t *vendor,
+				  u32 *attr, unsigned long *data_size,
+				  void *data);
+efi_status_t xen_efi_get_next_variable(unsigned long *name_size,
+				       efi_char16_t *name, efi_guid_t *vendor);
+efi_status_t xen_efi_set_variable(efi_char16_t *name, efi_guid_t *vendor,
+				  u32 attr, unsigned long data_size,
+				  void *data);
+efi_status_t xen_efi_query_variable_info(u32 attr, u64 *storage_space,
+					 u64 *remaining_space,
+					 u64 *max_variable_size);
+efi_status_t xen_efi_get_next_high_mono_count(u32 *count);
+efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
+				    unsigned long count, unsigned long sg_list);
+efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
+					unsigned long count, u64 *max_size,
+					int *reset_type);
 
 #ifdef CONFIG_PREEMPT
 
-- 
2.1.4


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[PATCH v10 15/17] ARM64: XEN: Add a function to initialize Xen specific UEFI runtime services

[Shannon Zhao]

When running on Xen hypervisor, runtime services are supported through
hypercall. Add a Xen specific function to initialize runtime services.

Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 arch/arm/include/asm/xen/xen-ops.h   |  6 ++++++
 arch/arm/xen/Makefile                |  1 +
 arch/arm/xen/efi.c                   | 40 ++++++++++++++++++++++++++++++++++++
 arch/arm64/include/asm/xen/xen-ops.h |  6 ++++++
 arch/arm64/xen/Makefile              |  1 +
 drivers/xen/Kconfig                  |  2 +-
 6 files changed, 55 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm/include/asm/xen/xen-ops.h
 create mode 100644 arch/arm/xen/efi.c
 create mode 100644 arch/arm64/include/asm/xen/xen-ops.h

diff --git a/arch/arm/include/asm/xen/xen-ops.h b/arch/arm/include/asm/xen/xen-ops.h
new file mode 100644
index 0000000..ec154e7
--- /dev/null
+++ b/arch/arm/include/asm/xen/xen-ops.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_XEN_OPS_H
+#define _ASM_XEN_OPS_H
+
+void xen_efi_runtime_setup(void);
+
+#endif /* _ASM_XEN_OPS_H */
diff --git a/arch/arm/xen/Makefile b/arch/arm/xen/Makefile
index 1296952..2279521 100644
--- a/arch/arm/xen/Makefile
+++ b/arch/arm/xen/Makefile
@@ -1 +1,2 @@
 obj-y		:= enlighten.o hypercall.o grant-table.o p2m.o mm.o
+obj-$(CONFIG_XEN_EFI) += efi.o
diff --git a/arch/arm/xen/efi.c b/arch/arm/xen/efi.c
new file mode 100644
index 0000000..16db419
--- /dev/null
+++ b/arch/arm/xen/efi.c
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2015, Linaro Limited, Shannon Zhao
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/efi.h>
+#include <xen/xen-ops.h>
+#include <asm/xen/xen-ops.h>
+
+/* Set XEN EFI runtime services function pointers. Other fields of struct efi,
+ * e.g. efi.systab, will be set like normal EFI.
+ */
+void __init xen_efi_runtime_setup(void)
+{
+	efi.get_time                 = xen_efi_get_time;
+	efi.set_time                 = xen_efi_set_time;
+	efi.get_wakeup_time          = xen_efi_get_wakeup_time;
+	efi.set_wakeup_time          = xen_efi_set_wakeup_time;
+	efi.get_variable             = xen_efi_get_variable;
+	efi.get_next_variable        = xen_efi_get_next_variable;
+	efi.set_variable             = xen_efi_set_variable;
+	efi.query_variable_info      = xen_efi_query_variable_info;
+	efi.update_capsule           = xen_efi_update_capsule;
+	efi.query_capsule_caps       = xen_efi_query_capsule_caps;
+	efi.get_next_high_mono_count = xen_efi_get_next_high_mono_count;
+	efi.reset_system             = NULL; /* Functionality provided by Xen. */
+}
+EXPORT_SYMBOL_GPL(xen_efi_runtime_setup);
diff --git a/arch/arm64/include/asm/xen/xen-ops.h b/arch/arm64/include/asm/xen/xen-ops.h
new file mode 100644
index 0000000..ec154e7
--- /dev/null
+++ b/arch/arm64/include/asm/xen/xen-ops.h
@@ -0,0 +1,6 @@
+#ifndef _ASM_XEN_OPS_H
+#define _ASM_XEN_OPS_H
+
+void xen_efi_runtime_setup(void);
+
+#endif /* _ASM_XEN_OPS_H */
diff --git a/arch/arm64/xen/Makefile b/arch/arm64/xen/Makefile
index 74a8d87..8ff8aa9 100644
--- a/arch/arm64/xen/Makefile
+++ b/arch/arm64/xen/Makefile
@@ -1,2 +1,3 @@
 xen-arm-y	+= $(addprefix ../../arm/xen/, enlighten.o grant-table.o p2m.o mm.o)
 obj-y		:= xen-arm.o hypercall.o
+obj-$(CONFIG_XEN_EFI) += $(addprefix ../../arm/xen/, efi.o)
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 979a8317..f15bb3b7 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -275,7 +275,7 @@ config XEN_HAVE_PVMMU
 
 config XEN_EFI
 	def_bool y
-	depends on X86_64 && EFI
+	depends on (ARM || ARM64 || X86_64) && EFI
 
 config XEN_AUTO_XLATE
 	def_bool y
-- 
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[PATCH v10 16/17] FDT: Add a helper to get the subnode by given name

[Shannon Zhao]

Sometimes it needs to check if there is a subnode of given node in FDT
by given name. Introduce this helper to get the subnode if it exists.

CC: Rob Herring <robh@kernel.org>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Rob Herring <robh@kernel.org>
---
 drivers/of/fdt.c       | 13 +++++++++++++
 include/linux/of_fdt.h |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 3349d2a..5c8b2f2 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -645,6 +645,19 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node,
 }
 
 /**
+ * of_get_flat_dt_subnode_by_name - get the subnode by given name
+ *
+ * @node: the parent node
+ * @uname: the name of subnode
+ * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none
+ */
+
+int of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname)
+{
+	return fdt_subnode_offset(initial_boot_params, node, uname);
+}
+
+/**
  * of_get_flat_dt_root - find the root node in the flat blob
  */
 unsigned long __init of_get_flat_dt_root(void)
diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
index 2fbe868..2c3707e 100644
--- a/include/linux/of_fdt.h
+++ b/include/linux/of_fdt.h
@@ -52,6 +52,8 @@ extern char __dtb_end[];
 extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname,
 				     int depth, void *data),
 			   void *data);
+extern int of_get_flat_dt_subnode_by_name(unsigned long node,
+					  const char *uname);
 extern const void *of_get_flat_dt_prop(unsigned long node, const char *name,
 				       int *size);
 extern int of_flat_dt_is_compatible(unsigned long node, const char *name);
-- 
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[PATCH v10 17/17] Xen: EFI: Parse DT parameters for Xen specific UEFI

[Shannon Zhao]

Add a new function to parse DT parameters for Xen specific UEFI just
like the way for normal UEFI. Then it could reuse the existing codes.

If Xen supports EFI, initialize runtime services.

CC: Matt Fleming <matt@codeblueprint.co.uk>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Matt Fleming <matt@codeblueprint.co.uk>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 arch/arm/xen/enlighten.c           |  6 +++++
 drivers/firmware/efi/arm-runtime.c | 17 +++++++++-----
 drivers/firmware/efi/efi.c         | 45 ++++++++++++++++++++++++++++++++------
 3 files changed, 56 insertions(+), 12 deletions(-)

diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
index 13e3e9f..e130562 100644
--- a/arch/arm/xen/enlighten.c
+++ b/arch/arm/xen/enlighten.c
@@ -261,6 +261,12 @@ static int __init fdt_find_hyper_node(unsigned long node, const char *uname,
 	    !strncmp(hyper_node.prefix, s, strlen(hyper_node.prefix)))
 		hyper_node.version = s + strlen(hyper_node.prefix);
 
+	if (IS_ENABLED(CONFIG_XEN_EFI)) {
+		/* Check if Xen supports EFI */
+		if (of_get_flat_dt_subnode_by_name(node, "uefi") > 0)
+			set_bit(EFI_PARAVIRT, &efi.flags);
+	}
+
 	return 0;
 }
 
diff --git a/drivers/firmware/efi/arm-runtime.c b/drivers/firmware/efi/arm-runtime.c
index 6ae21e4..ac609b9 100644
--- a/drivers/firmware/efi/arm-runtime.c
+++ b/drivers/firmware/efi/arm-runtime.c
@@ -27,6 +27,7 @@
 #include <asm/mmu.h>
 #include <asm/pgalloc.h>
 #include <asm/pgtable.h>
+#include <asm/xen/xen-ops.h>
 
 extern u64 efi_system_table;
 
@@ -107,13 +108,19 @@ static int __init arm_enable_runtime_services(void)
 	}
 	set_bit(EFI_SYSTEM_TABLES, &efi.flags);
 
-	if (!efi_virtmap_init()) {
-		pr_err("No UEFI virtual mapping was installed -- runtime services will not be available\n");
-		return -ENOMEM;
+	if (IS_ENABLED(CONFIG_XEN_EFI) && efi_enabled(EFI_PARAVIRT)) {
+		/* Set up runtime services function pointers for Xen Dom0 */
+		xen_efi_runtime_setup();
+	} else {
+		if (!efi_virtmap_init()) {
+			pr_err("No UEFI virtual mapping was installed -- runtime services will not be available\n");
+			return -ENOMEM;
+		}
+
+		/* Set up runtime services function pointers */
+		efi_native_runtime_setup();
 	}
 
-	/* Set up runtime services function pointers */
-	efi_native_runtime_setup();
 	set_bit(EFI_RUNTIME_SERVICES, &efi.flags);
 
 	efi.runtime_version = efi.systab->hdr.revision;
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 3a69ed5..519c096 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -469,12 +469,14 @@ device_initcall(efi_load_efivars);
 		FIELD_SIZEOF(struct efi_fdt_params, field) \
 	}
 
-static __initdata struct {
+struct params {
 	const char name[32];
 	const char propname[32];
 	int offset;
 	int size;
-} dt_params[] = {
+};
+
+static struct params fdt_params[] __initdata = {
 	UEFI_PARAM("System Table", "linux,uefi-system-table", system_table),
 	UEFI_PARAM("MemMap Address", "linux,uefi-mmap-start", mmap),
 	UEFI_PARAM("MemMap Size", "linux,uefi-mmap-size", mmap_size),
@@ -482,24 +484,45 @@ static __initdata struct {
 	UEFI_PARAM("MemMap Desc. Version", "linux,uefi-mmap-desc-ver", desc_ver)
 };
 
+static struct params xen_fdt_params[] __initdata = {
+	UEFI_PARAM("System Table", "xen,uefi-system-table", system_table),
+	UEFI_PARAM("MemMap Address", "xen,uefi-mmap-start", mmap),
+	UEFI_PARAM("MemMap Size", "xen,uefi-mmap-size", mmap_size),
+	UEFI_PARAM("MemMap Desc. Size", "xen,uefi-mmap-desc-size", desc_size),
+	UEFI_PARAM("MemMap Desc. Version", "xen,uefi-mmap-desc-ver", desc_ver)
+};
+
 struct param_info {
 	int found;
 	void *params;
+	struct params *dt_params;
+	int size;
 };
 
 static int __init fdt_find_uefi_params(unsigned long node, const char *uname,
 				       int depth, void *data)
 {
 	struct param_info *info = data;
+	struct params *dt_params = info->dt_params;
 	const void *prop;
 	void *dest;
 	u64 val;
-	int i, len;
+	int i, len, offset;
 
-	if (depth != 1 || strcmp(uname, "chosen") != 0)
-		return 0;
+	if (efi_enabled(EFI_PARAVIRT)) {
+		if (depth != 1 || strcmp(uname, "hypervisor") != 0)
+			return 0;
 
-	for (i = 0; i < ARRAY_SIZE(dt_params); i++) {
+		offset = of_get_flat_dt_subnode_by_name(node, "uefi");
+		if (offset < 0)
+			return 0;
+		node = offset;
+	} else {
+		if (depth != 1 || strcmp(uname, "chosen") != 0)
+			return 0;
+	}
+
+	for (i = 0; i < info->size; i++) {
 		prop = of_get_flat_dt_prop(node, dt_params[i].propname, &len);
 		if (!prop)
 			return 0;
@@ -530,12 +553,20 @@ int __init efi_get_fdt_params(struct efi_fdt_params *params)
 	info.found = 0;
 	info.params = params;
 
+	if (efi_enabled(EFI_PARAVIRT)) {
+		info.dt_params = xen_fdt_params;
+		info.size = ARRAY_SIZE(xen_fdt_params);
+	} else {
+		info.dt_params = fdt_params;
+		info.size = ARRAY_SIZE(fdt_params);
+	}
+
 	ret = of_scan_flat_dt(fdt_find_uefi_params, &info);
 	if (!info.found)
 		pr_info("UEFI not found.\n");
 	else if (!ret)
 		pr_err("Can't find '%s' in device tree!\n",
-		       dt_params[info.found].name);
+		       info.dt_params[info.found].name);
 
 	return ret;
 }
-- 
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Re: [PATCH v10 01/17] Xen: ACPI: Hide UART used by Xen

[Rafael J. Wysocki]

On Fri, Apr 1, 2016 at 5:48 PM, Shannon Zhao <shannon.zhao@linaro.org> wrote:
> ACPI 6.0 introduces a new table STAO to list the devices which are used
> by Xen and can't be used by Dom0. On Xen virtual platforms, the physical
> UART is used by Xen. So here it hides UART from Dom0.
>
> CC: "Rafael J. Wysocki" <rjw@rjwysocki.net> (supporter:ACPI)
> CC: Len Brown <lenb@kernel.org> (supporter:ACPI)
> CC: linux-acpi@vger.kernel.org (open list:ACPI)
> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> ---
>  drivers/acpi/scan.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 71 insertions(+)
>
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index 5f28cf7..4d2d9eb 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -45,6 +45,7 @@ static LIST_HEAD(acpi_scan_handlers_list);
>  DEFINE_MUTEX(acpi_device_lock);
>  LIST_HEAD(acpi_wakeup_device_list);
>  static DEFINE_MUTEX(acpi_hp_context_lock);

A comment here would be useful explaining that the below is an
exceptional thing an nothing like it is expected to be needed if
foreseeable future.

> +static u64 spcr_uart_addr;
>
>  struct acpi_dep_data {
>         struct list_head node;
> @@ -1453,6 +1454,44 @@ static int acpi_add_single_object(struct acpi_device **child,
>         return 0;
>  }
>
> +static acpi_status acpi_get_resource_memory(struct acpi_resource *ares,
> +                                           void *context)
> +{
> +       struct resource *res = context;
> +
> +       if (acpi_dev_resource_memory(ares, res))
> +               return AE_CTRL_TERMINATE;
> +
> +       return AE_OK;
> +}
> +
> +static bool acpi_device_should_be_hidden(acpi_handle handle)
> +{
> +       acpi_status status;
> +       struct resource res;
> +
> +       /* Check if it should ignore the UART device */
> +       if (!(spcr_uart_addr && acpi_has_method(handle, METHOD_NAME__CRS)))
> +               return false;
> +
> +       /*
> +        * The UART device described in SPCR table is assumed to have only one
> +        * memory resource present. So we only look for the first one here.
> +        */
> +       status = acpi_walk_resources(handle, METHOD_NAME__CRS,
> +                                    acpi_get_resource_memory, &res);
> +       if (ACPI_FAILURE(status))
> +               return false;
> +
> +       if (res.start == spcr_uart_addr) {

What about restructuring that a bit.

      if (ACPI_FAILURE(status) || res.start != spcr_uart_addr)
            return false;

> +               printk(KERN_INFO PREFIX "The UART device @%pa in SPCR table will be hidden\n",
> +                      &res.start);

And maybe use acpi_handle_info() for this message?

Thanks,
Rafael

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Re: [PATCH v10 00/17] Add ACPI support for Xen Dom0 on ARM64

[Julien Grall]

Hi Shannon,

On 01/04/2016 16:48, Shannon Zhao wrote:
> This patch set adds ACPI support for Xen Dom0 on ARM64. The relevant Xen
> ACPI on ARM64 design document could be found from [1].
>
> This patch set adds a new FDT node "uefi" under /hypervisor to pass UEFI
> information. Introduce a bus notifier of AMBA and Platform bus to map
> the new added device's MMIO space. Make Xen domain use
> xlated_setup_gnttab_pages to setup grant table and a new hypercall to
> get event-channel irq.
>
> Regarding the initialization flow of Linux kernel, it needs to move
> xen_early_init() before efi_init(). Then xen_early_init() will check
> whether it runs on Xen through the /hypervisor node and efi_init() will
> call a new function fdt_find_xen_uefi_params(), to parse those
> xen,uefi-* parameters just like the existing efi_get_fdt_params().
>
> And in arm64_enable_runtime_services() it will check whether it runs on
> Xen and call another new function xen_efi_runtime_setup() to setup
> runtime service instead of efi_native_runtime_setup(). The
> xen_efi_runtime_setup() will assign the runtime function pointers with
> the functions of driver/xen/efi.c.
>
> And since we pass a /hypervisor node and a /chosen node to Dom0, it
> needs to check whether the DTS only contains a /hypervisor node and a
> /chosen node in acpi_boot_table_init().
>
> Patches are tested on FVP base model. They can be fetched from[2].

I have tested this series and Linux is booting up to the prompt:

Tested-by: Julien Grall <julien.grall@arm.com>

Regards,

-- 
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Re: [PATCH v10 02/17] xen/grant-table: Move xlated_setup_gnttab_pages to common place

[Julien Grall]

Hi Shannon,

On 01/04/2016 16:49, Shannon Zhao wrote:
> Move xlated_setup_gnttab_pages to common place, so it can be reused by
> ARM to setup grant table.
>
> Rename it to xen_xlate_map_ballooned_pages.
>
> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

Reviewed-by: Julien Grall <julien.grall@arm.com>

Regards,

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Re: [PATCH v10 03/17] Xen: xlate: Use page_to_xen_pfn instead of page_to_pfn

[Julien Grall]

Hi Shannon,

On 01/04/2016 16:49, Shannon Zhao wrote:
> Make xen_xlate_map_ballooned_pages work with 64K pages. In that case
> Kernel pages are 64K in size but Xen pages remain 4K in size. Xen pfns
> refer to 4K pages.
>
> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

Reviewed-by: Julien Grall <julien.grall@arm.com>

Regards,

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Re: [PATCH v10 04/17] arm/xen: Use xen_xlate_map_ballooned_pages to setup grant table

[Julien Grall]

Hi Shannon,

On 01/04/2016 16:49, Shannon Zhao wrote:
> Use xen_xlate_map_ballooned_pages to setup grant table. Then it doesn't
> rely on DT or ACPI to pass the start address and size of grant table.
>
> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

Reviewed-by: Julien Grall <julien.grall@arm.com>

Regards,

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Re: [PATCH v10 05/17] xen: memory : Add new XENMAPSPACE type XENMAPSPACE_dev_mmio

[Julien Grall]

Hi Shannon,

On 01/04/2016 16:49, Shannon Zhao wrote:
> Add a new type of Xen map space for Dom0 to map device's MMIO region.
>
> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>

Reviewed-by: Julien Grall <julien.grall@arm.com>

Regards,

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Re: [PATCH v10 06/17] Xen: ARM: Add support for mapping platform device mmio

[Julien Grall]

Hi Shannon,

Sorry to come late in the review process.

On 01/04/2016 16:49, Shannon Zhao wrote:
> Add a bus_notifier for platform bus device in order to map the device
> mmio regions when DOM0 booting with ACPI.
>
> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
> ---
>   drivers/xen/Makefile     |   1 +
>   drivers/xen/arm-device.c | 141 +++++++++++++++++++++++++++++++++++++++++++++++
>   2 files changed, 142 insertions(+)
>   create mode 100644 drivers/xen/arm-device.c
>
> diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
> index 9b7a35c..415f286 100644
> --- a/drivers/xen/Makefile
> +++ b/drivers/xen/Makefile
> @@ -9,6 +9,7 @@ CFLAGS_features.o			:= $(nostackp)
>
>   CFLAGS_efi.o				+= -fshort-wchar
>
> +dom0-$(CONFIG_ARM64) += arm-device.o
>   dom0-$(CONFIG_PCI) += pci.o
>   dom0-$(CONFIG_USB_SUPPORT) += dbgp.o
>   dom0-$(CONFIG_XEN_ACPI) += acpi.o $(xen-pad-y)
> diff --git a/drivers/xen/arm-device.c b/drivers/xen/arm-device.c
> new file mode 100644
> index 0000000..76e26e5
> --- /dev/null
> +++ b/drivers/xen/arm-device.c
> @@ -0,0 +1,141 @@
> +/*
> + * Copyright (c) 2015, Linaro Limited, Shannon Zhao
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope it will be useful, but WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program.  If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <linux/platform_device.h>
> +#include <linux/acpi.h>
> +#include <xen/xen.h>
> +#include <xen/page.h>
> +#include <xen/interface/memory.h>
> +#include <asm/xen/hypervisor.h>
> +#include <asm/xen/hypercall.h>
> +
> +static int xen_unmap_device_mmio(struct resource *resource, unsigned int count)

NITs:

There is multiple resource so s/resource/resources/.

Also the variable could be const.

> +{
> +	unsigned int i, j, nr;
> +	int rc = 0;
> +	struct resource *r;
> +	struct xen_remove_from_physmap xrp;
> +
> +	for (i = 0; i < count; i++) {
> +		r = &resource[i];
> +		nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE);
> +		if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0))
> +			continue;
> +
> +		for (j = 0; j < nr; j++) {
> +			xrp.domid = DOMID_SELF;
> +			xrp.gpfn = XEN_PFN_DOWN(r->start) + j;
> +			rc = HYPERVISOR_memory_op(XENMEM_remove_from_physmap,
> +						  &xrp);
> +			if (rc)
> +				return rc;
> +		}
> +	}
> +
> +	return rc;
> +}
> +
> +static int xen_map_device_mmio(struct resource *resource, unsigned int count)

Ditto

> +{
> +	unsigned int i, j, nr;
> +	int rc = 0;
> +	struct resource *r;
> +	xen_pfn_t *gpfns;
> +	xen_ulong_t *idxs;
> +	int *errs;
> +	struct xen_add_to_physmap_range xatp;
> +
> +	for (i = 0; i < count; i++) {
> +		r = &resource[i];
> +		nr = DIV_ROUND_UP(resource_size(r), XEN_PAGE_SIZE);
> +		if ((resource_type(r) != IORESOURCE_MEM) || (nr == 0))
> +			continue;
> +
> +		gpfns = kzalloc(sizeof(xen_pfn_t) * nr, GFP_KERNEL);
> +		idxs = kzalloc(sizeof(xen_ulong_t) * nr, GFP_KERNEL);
> +		errs = kzalloc(sizeof(int) * nr, GFP_KERNEL);
> +		if (!gpfns || !idxs || !errs) {
> +			kfree(gpfns);
> +			kfree(idxs);
> +			kfree(errs);
> +			return -ENOMEM;
> +		}
> +
> +		for (j = 0; j < nr; j++) {

I would add a comment to explain that the regions are always mapped 1:1 
to DOM0, and this is fine because the memory map for DOM0 is the same as 
the host (except for the RAM).

> +			gpfns[j] = XEN_PFN_DOWN(r->start) + j;
> +			idxs[j] = XEN_PFN_DOWN(r->start) + j;
> +		}
> +
> +		xatp.domid = DOMID_SELF;
> +		xatp.size = nr;
> +		xatp.space = XENMAPSPACE_dev_mmio;
> +
> +		set_xen_guest_handle(xatp.gpfns, gpfns);
> +		set_xen_guest_handle(xatp.idxs, idxs);
> +		set_xen_guest_handle(xatp.errs, errs);
> +
> +		rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
> +		kfree(gpfns);
> +		kfree(idxs);
> +		kfree(errs);
> +		if (rc)
> +			return rc;

Shouldn't we redo the mapping if the hypercall fails?

> +	}
> +
> +	return rc;
> +}
> +
> +static int xen_platform_notifier(struct notifier_block *nb,
> +				 unsigned long action, void *data)
> +{
> +	struct platform_device *pdev = to_platform_device(data);
> +	int r = 0;
> +
> +	if (pdev->num_resources == 0 || pdev->resource == NULL)
> +		return NOTIFY_OK;
> +
> +	switch (action) {
> +	case BUS_NOTIFY_ADD_DEVICE:
> +		r = xen_map_device_mmio(pdev->resource, pdev->num_resources);
> +		break;
> +	case BUS_NOTIFY_DEL_DEVICE:
> +		r = xen_unmap_device_mmio(pdev->resource, pdev->num_resources);
> +		break;
> +	default:
> +		return NOTIFY_DONE;
> +	}
> +	if (r)
> +		dev_err(&pdev->dev, "Platform: Failed to %s device %s MMIO!\n",
> +			action == BUS_NOTIFY_ADD_DEVICE ? "map" :
> +			(action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"),
> +			pdev->name);
> +
> +	return NOTIFY_OK;
> +}
> +
> +static struct notifier_block platform_device_nb = {
> +	.notifier_call = xen_platform_notifier,
> +};
> +
> +static int __init register_xen_platform_notifier(void)
> +{
> +	if (!xen_initial_domain() || acpi_disabled)
> +		return 0;
> +
> +	return bus_register_notifier(&platform_bus_type, &platform_device_nb);
> +}
> +
> +arch_initcall(register_xen_platform_notifier);
>

Regards,

-- 
Julien Grall

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Re: [PATCH v10 06/17] Xen: ARM: Add support for mapping platform device mmio

[Shannon Zhao]

On 2016/4/6 20:16, Julien Grall wrote:
>> +            gpfns[j] = XEN_PFN_DOWN(r->start) + j;
>> +            idxs[j] = XEN_PFN_DOWN(r->start) + j;
>> +        }
>> +
>> +        xatp.domid = DOMID_SELF;
>> +        xatp.size = nr;
>> +        xatp.space = XENMAPSPACE_dev_mmio;
>> +
>> +        set_xen_guest_handle(xatp.gpfns, gpfns);
>> +        set_xen_guest_handle(xatp.idxs, idxs);
>> +        set_xen_guest_handle(xatp.errs, errs);
>> +
>> +        rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
>> +        kfree(gpfns);
>> +        kfree(idxs);
>> +        kfree(errs);
>> +        if (rc)
>> +            return rc;
> 
> Shouldn't we redo the mapping if the hypercall fails?
Hmm, why? If it fails again when we redo the mapping, what should we do
then? Redo again?
I think if it fails at the first time it will always fail no matter how
many times we do.

Thanks,
-- 
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Re: [PATCH v10 06/17] Xen: ARM: Add support for mapping platform device mmio

[Julien Grall]

Hi Shannon,

On 07/04/16 02:37, Shannon Zhao wrote:
>
>
> On 2016/4/6 20:16, Julien Grall wrote:
>>> +            gpfns[j] = XEN_PFN_DOWN(r->start) + j;
>>> +            idxs[j] = XEN_PFN_DOWN(r->start) + j;
>>> +        }
>>> +
>>> +        xatp.domid = DOMID_SELF;
>>> +        xatp.size = nr;
>>> +        xatp.space = XENMAPSPACE_dev_mmio;
>>> +
>>> +        set_xen_guest_handle(xatp.gpfns, gpfns);
>>> +        set_xen_guest_handle(xatp.idxs, idxs);
>>> +        set_xen_guest_handle(xatp.errs, errs);
>>> +
>>> +        rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
>>> +        kfree(gpfns);
>>> +        kfree(idxs);
>>> +        kfree(errs);
>>> +        if (rc)
>>> +            return rc;
>>
>> Shouldn't we redo the mapping if the hypercall fails?
> Hmm, why? If it fails again when we redo the mapping, what should we do
> then? Redo again?

Because the device MMIO region is left half mapped in DOM0 address space.

After having another look to your patch, if an error occurs, the 
notifier will still return NOTIFY_OK. This will lead to random data 
abort when the driver is accessing the MMIO regions as the device will 
be considered fully functional.

However, even if the notifier return NOTIFY_BAD, the function device_add 
doesn't care about the return value of blocking_notifier_call_chain. I 
think this need to be fixed.

> I think if it fails at the first time it will always fail no matter how
> many times we do.

I was speaking about the mappings that succeeded. They will unlikely 
fail during removal. If they ever fail you can just ignore the error.

Regards,

-- 
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Re: [PATCH v10 06/17] Xen: ARM: Add support for mapping platform device mmio

[Shannon Zhao]

On 2016/4/7 18:32, Julien Grall wrote:
> Hi Shannon,
> 
> On 07/04/16 02:37, Shannon Zhao wrote:
>>
>>
>> On 2016/4/6 20:16, Julien Grall wrote:
>>>> +            gpfns[j] = XEN_PFN_DOWN(r->start) + j;
>>>> +            idxs[j] = XEN_PFN_DOWN(r->start) + j;
>>>> +        }
>>>> +
>>>> +        xatp.domid = DOMID_SELF;
>>>> +        xatp.size = nr;
>>>> +        xatp.space = XENMAPSPACE_dev_mmio;
>>>> +
>>>> +        set_xen_guest_handle(xatp.gpfns, gpfns);
>>>> +        set_xen_guest_handle(xatp.idxs, idxs);
>>>> +        set_xen_guest_handle(xatp.errs, errs);
>>>> +
>>>> +        rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
>>>> +        kfree(gpfns);
>>>> +        kfree(idxs);
>>>> +        kfree(errs);
>>>> +        if (rc)
>>>> +            return rc;
>>>
>>> Shouldn't we redo the mapping if the hypercall fails?
>> Hmm, why? If it fails again when we redo the mapping, what should we do
>> then? Redo again?
> 
> Because the device MMIO region is left half mapped in DOM0 address space.
> 
> After having another look to your patch, if an error occurs, the
> notifier will still return NOTIFY_OK. This will lead to random data
> abort when the driver is accessing the MMIO regions as the device will
> be considered fully functional.
> 
> However, even if the notifier return NOTIFY_BAD, the function device_add
> doesn't care about the return value of blocking_notifier_call_chain. I
> think this need to be fixed.
> 
>> I think if it fails at the first time it will always fail no matter how
>> many times we do.
> 
> I was speaking about the mappings that succeeded. They will unlikely
> fail during removal. If they ever fail you can just ignore the error.
Ok, I see. I thought you mean that it needs to map the regions again.
But what you really mean is undoing the mappings.

Thanks,
-- 
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Re: [PATCH v10 07/17] Xen: ARM: Add support for mapping AMBA device mmio

[Julien Grall]

Hi Shannon,

On 01/04/2016 16:49, Shannon Zhao wrote:
> Add a bus_notifier for AMBA bus device in order to map the device
> mmio regions when DOM0 booting with ACPI.
>
> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

Reviewed-by: Julien Grall <julien.grall@arm.com>

Regards,

-- 
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Re: [PATCH v10 09/17] xen/hvm/params: Add a new delivery type for event-channel in HVM_PARAM_CALLBACK_IRQ

[Julien Grall]

Hi Shannon,

On 01/04/2016 16:49, Shannon Zhao wrote:
> This new delivery type which is for ARM shares the same value with
> HVM_PARAM_CALLBACK_TYPE_VECTOR which is for x86.
>
> val[15:8] is flag: val[7:0] is a PPI.
> To the flag, bit 8 stands the interrupt mode is edge(1) or level(0) and
> bit 9 stands the interrupt polarity is active low(1) or high(0).
>
> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

Reviewed-by: Julien Grall <julien.grall@arm.com>

Regards,

-- 
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Re: [PATCH v10 10/17] arm/xen: Get event-channel irq through HVM_PARAM when booting with ACPI

[Julien Grall]

Hi Shannon,

On 01/04/2016 16:49, Shannon Zhao wrote:
> The kernel will get the event-channel IRQ through
> HVM_PARAM_CALLBACK_IRQ.
>
> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

Reviewed-by: Julien Grall <julien.grall@arm.com>

Regards,

-- 
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Re: [PATCH v10 11/17] ARM: XEN: Move xen_early_init() before efi_init()

[Julien Grall]

Hi Shannon,

On 01/04/2016 16:49, Shannon Zhao wrote:
> Move xen_early_init() before efi_init(), then when calling efi_init()
> could initialize Xen specific UEFI.
>
> Check if it runs on Xen hypervisor through the flat dts.
>
> Cc: Russell King <linux@arm.linux.org.uk>
> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>

Reviewed-by: Julien Grall <julien.grall@arm.com>

Regards,

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Re: [PATCH v10 00/17] Add ACPI support for Xen Dom0 on ARM64

[Shannon Zhao]

Hi Julien,

On 2016/4/6 19:32, Julien Grall wrote:
> Hi Shannon,
> 
> On 01/04/2016 16:48, Shannon Zhao wrote:
>> This patch set adds ACPI support for Xen Dom0 on ARM64. The relevant Xen
>> ACPI on ARM64 design document could be found from [1].
>>
>> This patch set adds a new FDT node "uefi" under /hypervisor to pass UEFI
>> information. Introduce a bus notifier of AMBA and Platform bus to map
>> the new added device's MMIO space. Make Xen domain use
>> xlated_setup_gnttab_pages to setup grant table and a new hypercall to
>> get event-channel irq.
>>
>> Regarding the initialization flow of Linux kernel, it needs to move
>> xen_early_init() before efi_init(). Then xen_early_init() will check
>> whether it runs on Xen through the /hypervisor node and efi_init() will
>> call a new function fdt_find_xen_uefi_params(), to parse those
>> xen,uefi-* parameters just like the existing efi_get_fdt_params().
>>
>> And in arm64_enable_runtime_services() it will check whether it runs on
>> Xen and call another new function xen_efi_runtime_setup() to setup
>> runtime service instead of efi_native_runtime_setup(). The
>> xen_efi_runtime_setup() will assign the runtime function pointers with
>> the functions of driver/xen/efi.c.
>>
>> And since we pass a /hypervisor node and a /chosen node to Dom0, it
>> needs to check whether the DTS only contains a /hypervisor node and a
>> /chosen node in acpi_boot_table_init().
>>
>> Patches are tested on FVP base model. They can be fetched from[2].
> 
> I have tested this series and Linux is booting up to the prompt:
> 
> Tested-by: Julien Grall <julien.grall@arm.com>
Thanks a lot. There are several patches which you didn't give your
comments. So I assume you will review them. If so, I'll wait and update
this series later.

Thanks,
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Re: [PATCH v10 00/17] Add ACPI support for Xen Dom0 on ARM64

[Julien Grall]

On 07/04/16 02:39, Shannon Zhao wrote:
> Hi Julien,

Hi Shannon,

> On 2016/4/6 19:32, Julien Grall wrote:
>> Hi Shannon,
>>
>> On 01/04/2016 16:48, Shannon Zhao wrote:
>>> This patch set adds ACPI support for Xen Dom0 on ARM64. The relevant Xen
>>> ACPI on ARM64 design document could be found from [1].
>>>
>>> This patch set adds a new FDT node "uefi" under /hypervisor to pass UEFI
>>> information. Introduce a bus notifier of AMBA and Platform bus to map
>>> the new added device's MMIO space. Make Xen domain use
>>> xlated_setup_gnttab_pages to setup grant table and a new hypercall to
>>> get event-channel irq.
>>>
>>> Regarding the initialization flow of Linux kernel, it needs to move
>>> xen_early_init() before efi_init(). Then xen_early_init() will check
>>> whether it runs on Xen through the /hypervisor node and efi_init() will
>>> call a new function fdt_find_xen_uefi_params(), to parse those
>>> xen,uefi-* parameters just like the existing efi_get_fdt_params().
>>>
>>> And in arm64_enable_runtime_services() it will check whether it runs on
>>> Xen and call another new function xen_efi_runtime_setup() to setup
>>> runtime service instead of efi_native_runtime_setup(). The
>>> xen_efi_runtime_setup() will assign the runtime function pointers with
>>> the functions of driver/xen/efi.c.
>>>
>>> And since we pass a /hypervisor node and a /chosen node to Dom0, it
>>> needs to check whether the DTS only contains a /hypervisor node and a
>>> /chosen node in acpi_boot_table_init().
>>>
>>> Patches are tested on FVP base model. They can be fetched from[2].
>>
>> I have tested this series and Linux is booting up to the prompt:
>>
>> Tested-by: Julien Grall <julien.grall@arm.com>
> Thanks a lot. There are several patches which you didn't give your
> comments. So I assume you will review them. If so, I'll wait and update
> this series later.

I don't have any comments on those patches. You can go ahead to update 
the patch series.

Regards,

-- 
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