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-rw-r--r--Documentation/ABI/stable/sysfs-hypervisor-xen119
-rw-r--r--Documentation/ABI/testing/sysfs-hypervisor-xen (renamed from Documentation/ABI/testing/sysfs-hypervisor-pmu)24
-rw-r--r--MAINTAINERS2
-rw-r--r--arch/arm/include/asm/xen/events.h2
-rw-r--r--arch/arm/xen/p2m.c10
-rw-r--r--arch/x86/include/asm/xen/hypercall.h13
-rw-r--r--arch/x86/xen/enlighten.c154
-rw-r--r--arch/x86/xen/enlighten_hvm.c64
-rw-r--r--arch/x86/xen/enlighten_pv.c89
-rw-r--r--arch/x86/xen/setup.c7
-rw-r--r--arch/x86/xen/smp.c31
-rw-r--r--arch/x86/xen/smp.h2
-rw-r--r--arch/x86/xen/smp_hvm.c14
-rw-r--r--arch/x86/xen/smp_pv.c6
-rw-r--r--arch/x86/xen/suspend_hvm.c11
-rw-r--r--arch/x86/xen/xen-ops.h3
-rw-r--r--drivers/xen/events/events_base.c6
-rw-r--r--drivers/xen/evtchn.c34
-rw-r--r--drivers/xen/manage.c12
-rw-r--r--drivers/xen/sys-hypervisor.c62
-rw-r--r--drivers/xen/xenbus/xenbus_comms.c21
-rw-r--r--include/xen/arm/hypercall.h5
-rw-r--r--include/xen/events.h1
-rw-r--r--include/xen/interface/version.h15
-rw-r--r--include/xen/xen-ops.h2
25 files changed, 542 insertions, 167 deletions
diff --git a/Documentation/ABI/stable/sysfs-hypervisor-xen b/Documentation/ABI/stable/sysfs-hypervisor-xen
new file mode 100644
index 000000000000..3cf5cdfcd9a8
--- /dev/null
+++ b/Documentation/ABI/stable/sysfs-hypervisor-xen
@@ -0,0 +1,119 @@
+What: /sys/hypervisor/compilation/compile_date
+Date: March 2009
+KernelVersion: 2.6.30
+Contact: xen-devel@lists.xenproject.org
+Description: If running under Xen:
+ Contains the build time stamp of the Xen hypervisor
+ Might return "<denied>" in case of special security settings
+ in the hypervisor.
+
+What: /sys/hypervisor/compilation/compiled_by
+Date: March 2009
+KernelVersion: 2.6.30
+Contact: xen-devel@lists.xenproject.org
+Description: If running under Xen:
+ Contains information who built the Xen hypervisor
+ Might return "<denied>" in case of special security settings
+ in the hypervisor.
+
+What: /sys/hypervisor/compilation/compiler
+Date: March 2009
+KernelVersion: 2.6.30
+Contact: xen-devel@lists.xenproject.org
+Description: If running under Xen:
+ Compiler which was used to build the Xen hypervisor
+ Might return "<denied>" in case of special security settings
+ in the hypervisor.
+
+What: /sys/hypervisor/properties/capabilities
+Date: March 2009
+KernelVersion: 2.6.30
+Contact: xen-devel@lists.xenproject.org
+Description: If running under Xen:
+ Space separated list of supported guest system types. Each type
+ is in the format: <class>-<major>.<minor>-<arch>
+ With:
+ <class>: "xen" -- x86: paravirtualized, arm: standard
+ "hvm" -- x86 only: fully virtualized
+ <major>: major guest interface version
+ <minor>: minor guest interface version
+ <arch>: architecture, e.g.:
+ "x86_32": 32 bit x86 guest without PAE
+ "x86_32p": 32 bit x86 guest with PAE
+ "x86_64": 64 bit x86 guest
+ "armv7l": 32 bit arm guest
+ "aarch64": 64 bit arm guest
+
+What: /sys/hypervisor/properties/changeset
+Date: March 2009
+KernelVersion: 2.6.30
+Contact: xen-devel@lists.xenproject.org
+Description: If running under Xen:
+ Changeset of the hypervisor (git commit)
+ Might return "<denied>" in case of special security settings
+ in the hypervisor.
+
+What: /sys/hypervisor/properties/features
+Date: March 2009
+KernelVersion: 2.6.30
+Contact: xen-devel@lists.xenproject.org
+Description: If running under Xen:
+ Features the Xen hypervisor supports for the guest as defined
+ in include/xen/interface/features.h printed as a hex value.
+
+What: /sys/hypervisor/properties/pagesize
+Date: March 2009
+KernelVersion: 2.6.30
+Contact: xen-devel@lists.xenproject.org
+Description: If running under Xen:
+ Default page size of the hypervisor printed as a hex value.
+ Might return "0" in case of special security settings
+ in the hypervisor.
+
+What: /sys/hypervisor/properties/virtual_start
+Date: March 2009
+KernelVersion: 2.6.30
+Contact: xen-devel@lists.xenproject.org
+Description: If running under Xen:
+ Virtual address of the hypervisor as a hex value.
+
+What: /sys/hypervisor/type
+Date: March 2009
+KernelVersion: 2.6.30
+Contact: xen-devel@lists.xenproject.org
+Description: If running under Xen:
+ Type of hypervisor:
+ "xen": Xen hypervisor
+
+What: /sys/hypervisor/uuid
+Date: March 2009
+KernelVersion: 2.6.30
+Contact: xen-devel@lists.xenproject.org
+Description: If running under Xen:
+ UUID of the guest as known to the Xen hypervisor.
+
+What: /sys/hypervisor/version/extra
+Date: March 2009
+KernelVersion: 2.6.30
+Contact: xen-devel@lists.xenproject.org
+Description: If running under Xen:
+ The Xen version is in the format <major>.<minor><extra>
+ This is the <extra> part of it.
+ Might return "<denied>" in case of special security settings
+ in the hypervisor.
+
+What: /sys/hypervisor/version/major
+Date: March 2009
+KernelVersion: 2.6.30
+Contact: xen-devel@lists.xenproject.org
+Description: If running under Xen:
+ The Xen version is in the format <major>.<minor><extra>
+ This is the <major> part of it.
+
+What: /sys/hypervisor/version/minor
+Date: March 2009
+KernelVersion: 2.6.30
+Contact: xen-devel@lists.xenproject.org
+Description: If running under Xen:
+ The Xen version is in the format <major>.<minor><extra>
+ This is the <minor> part of it.
diff --git a/Documentation/ABI/testing/sysfs-hypervisor-pmu b/Documentation/ABI/testing/sysfs-hypervisor-xen
index 224faa105e18..53b7b2ea7515 100644
--- a/Documentation/ABI/testing/sysfs-hypervisor-pmu
+++ b/Documentation/ABI/testing/sysfs-hypervisor-xen
@@ -1,8 +1,19 @@
+What: /sys/hypervisor/guest_type
+Date: June 2017
+KernelVersion: 4.13
+Contact: xen-devel@lists.xenproject.org
+Description: If running under Xen:
+ Type of guest:
+ "Xen": standard guest type on arm
+ "HVM": fully virtualized guest (x86)
+ "PV": paravirtualized guest (x86)
+ "PVH": fully virtualized guest without legacy emulation (x86)
+
What: /sys/hypervisor/pmu/pmu_mode
Date: August 2015
KernelVersion: 4.3
Contact: Boris Ostrovsky <boris.ostrovsky@oracle.com>
-Description:
+Description: If running under Xen:
Describes mode that Xen's performance-monitoring unit (PMU)
uses. Accepted values are
"off" -- PMU is disabled
@@ -17,7 +28,16 @@ What: /sys/hypervisor/pmu/pmu_features
Date: August 2015
KernelVersion: 4.3
Contact: Boris Ostrovsky <boris.ostrovsky@oracle.com>
-Description:
+Description: If running under Xen:
Describes Xen PMU features (as an integer). A set bit indicates
that the corresponding feature is enabled. See
include/xen/interface/xenpmu.h for available features
+
+What: /sys/hypervisor/properties/buildid
+Date: June 2017
+KernelVersion: 4.13
+Contact: xen-devel@lists.xenproject.org
+Description: If running under Xen:
+ Build id of the hypervisor, needed for hypervisor live patching.
+ Might return "<denied>" in case of special security settings
+ in the hypervisor.
diff --git a/MAINTAINERS b/MAINTAINERS
index 1c1d106a3347..c8f7952b8bbe 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14228,6 +14228,8 @@ F: drivers/xen/
F: arch/x86/include/asm/xen/
F: include/xen/
F: include/uapi/xen/
+F: Documentation/ABI/stable/sysfs-hypervisor-xen
+F: Documentation/ABI/testing/sysfs-hypervisor-xen
XEN HYPERVISOR ARM
M: Stefano Stabellini <sstabellini@kernel.org>
diff --git a/arch/arm/include/asm/xen/events.h b/arch/arm/include/asm/xen/events.h
index 71e473d05fcc..620dc75362e5 100644
--- a/arch/arm/include/asm/xen/events.h
+++ b/arch/arm/include/asm/xen/events.h
@@ -16,7 +16,7 @@ static inline int xen_irqs_disabled(struct pt_regs *regs)
return raw_irqs_disabled_flags(regs->ARM_cpsr);
}
-#define xchg_xen_ulong(ptr, val) atomic64_xchg(container_of((ptr), \
+#define xchg_xen_ulong(ptr, val) atomic64_xchg(container_of((long long*)(ptr),\
atomic64_t, \
counter), (val))
diff --git a/arch/arm/xen/p2m.c b/arch/arm/xen/p2m.c
index 0ed01f2d5ee4..e71eefa2e427 100644
--- a/arch/arm/xen/p2m.c
+++ b/arch/arm/xen/p2m.c
@@ -144,17 +144,17 @@ bool __set_phys_to_machine_multi(unsigned long pfn,
return true;
}
- p2m_entry = kzalloc(sizeof(struct xen_p2m_entry), GFP_NOWAIT);
- if (!p2m_entry) {
- pr_warn("cannot allocate xen_p2m_entry\n");
+ p2m_entry = kzalloc(sizeof(*p2m_entry), GFP_NOWAIT);
+ if (!p2m_entry)
return false;
- }
+
p2m_entry->pfn = pfn;
p2m_entry->nr_pages = nr_pages;
p2m_entry->mfn = mfn;
write_lock_irqsave(&p2m_lock, irqflags);
- if ((rc = xen_add_phys_to_mach_entry(p2m_entry)) < 0) {
+ rc = xen_add_phys_to_mach_entry(p2m_entry);
+ if (rc < 0) {
write_unlock_irqrestore(&p2m_lock, irqflags);
return false;
}
diff --git a/arch/x86/include/asm/xen/hypercall.h b/arch/x86/include/asm/xen/hypercall.h
index f6d20f6cca12..11071fcd630e 100644
--- a/arch/x86/include/asm/xen/hypercall.h
+++ b/arch/x86/include/asm/xen/hypercall.h
@@ -43,6 +43,7 @@
#include <asm/page.h>
#include <asm/pgtable.h>
+#include <asm/smap.h>
#include <xen/interface/xen.h>
#include <xen/interface/sched.h>
@@ -50,6 +51,8 @@
#include <xen/interface/platform.h>
#include <xen/interface/xen-mca.h>
+struct xen_dm_op_buf;
+
/*
* The hypercall asms have to meet several constraints:
* - Work on 32- and 64-bit.
@@ -214,10 +217,12 @@ privcmd_call(unsigned call,
__HYPERCALL_DECLS;
__HYPERCALL_5ARG(a1, a2, a3, a4, a5);
+ stac();
asm volatile("call *%[call]"
: __HYPERCALL_5PARAM
: [call] "a" (&hypercall_page[call])
: __HYPERCALL_CLOBBER5);
+ clac();
return (long)__res;
}
@@ -474,9 +479,13 @@ HYPERVISOR_xenpmu_op(unsigned int op, void *arg)
static inline int
HYPERVISOR_dm_op(
- domid_t dom, unsigned int nr_bufs, void *bufs)
+ domid_t dom, unsigned int nr_bufs, struct xen_dm_op_buf *bufs)
{
- return _hypercall3(int, dm_op, dom, nr_bufs, bufs);
+ int ret;
+ stac();
+ ret = _hypercall3(int, dm_op, dom, nr_bufs, bufs);
+ clac();
+ return ret;
}
static inline void
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index a5ffcbb20cc0..0e7ef69e8531 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -106,15 +106,83 @@ int xen_cpuhp_setup(int (*cpu_up_prepare_cb)(unsigned int),
return rc >= 0 ? 0 : rc;
}
-static void clamp_max_cpus(void)
+static int xen_vcpu_setup_restore(int cpu)
{
-#ifdef CONFIG_SMP
- if (setup_max_cpus > MAX_VIRT_CPUS)
- setup_max_cpus = MAX_VIRT_CPUS;
-#endif
+ int rc = 0;
+
+ /* Any per_cpu(xen_vcpu) is stale, so reset it */
+ xen_vcpu_info_reset(cpu);
+
+ /*
+ * For PVH and PVHVM, setup online VCPUs only. The rest will
+ * be handled by hotplug.
+ */
+ if (xen_pv_domain() ||
+ (xen_hvm_domain() && cpu_online(cpu))) {
+ rc = xen_vcpu_setup(cpu);
+ }
+
+ return rc;
+}
+
+/*
+ * On restore, set the vcpu placement up again.
+ * If it fails, then we're in a bad state, since
+ * we can't back out from using it...
+ */
+void xen_vcpu_restore(void)
+{
+ int cpu, rc;
+
+ for_each_possible_cpu(cpu) {
+ bool other_cpu = (cpu != smp_processor_id());
+ bool is_up;
+
+ if (xen_vcpu_nr(cpu) == XEN_VCPU_ID_INVALID)
+ continue;
+
+ /* Only Xen 4.5 and higher support this. */
+ is_up = HYPERVISOR_vcpu_op(VCPUOP_is_up,
+ xen_vcpu_nr(cpu), NULL) > 0;
+
+ if (other_cpu && is_up &&
+ HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(cpu), NULL))
+ BUG();
+
+ if (xen_pv_domain() || xen_feature(XENFEAT_hvm_safe_pvclock))
+ xen_setup_runstate_info(cpu);
+
+ rc = xen_vcpu_setup_restore(cpu);
+ if (rc)
+ pr_emerg_once("vcpu restore failed for cpu=%d err=%d. "
+ "System will hang.\n", cpu, rc);
+ /*
+ * In case xen_vcpu_setup_restore() fails, do not bring up the
+ * VCPU. This helps us avoid the resulting OOPS when the VCPU
+ * accesses pvclock_vcpu_time via xen_vcpu (which is NULL.)
+ * Note that this does not improve the situation much -- now the
+ * VM hangs instead of OOPSing -- with the VCPUs that did not
+ * fail, spinning in stop_machine(), waiting for the failed
+ * VCPUs to come up.
+ */
+ if (other_cpu && is_up && (rc == 0) &&
+ HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL))
+ BUG();
+ }
}
-void xen_vcpu_setup(int cpu)
+void xen_vcpu_info_reset(int cpu)
+{
+ if (xen_vcpu_nr(cpu) < MAX_VIRT_CPUS) {
+ per_cpu(xen_vcpu, cpu) =
+ &HYPERVISOR_shared_info->vcpu_info[xen_vcpu_nr(cpu)];
+ } else {
+ /* Set to NULL so that if somebody accesses it we get an OOPS */
+ per_cpu(xen_vcpu, cpu) = NULL;
+ }
+}
+
+int xen_vcpu_setup(int cpu)
{
struct vcpu_register_vcpu_info info;
int err;
@@ -123,11 +191,11 @@ void xen_vcpu_setup(int cpu)
BUG_ON(HYPERVISOR_shared_info == &xen_dummy_shared_info);
/*
- * This path is called twice on PVHVM - first during bootup via
- * smp_init -> xen_hvm_cpu_notify, and then if the VCPU is being
- * hotplugged: cpu_up -> xen_hvm_cpu_notify.
- * As we can only do the VCPUOP_register_vcpu_info once lets
- * not over-write its result.
+ * This path is called on PVHVM at bootup (xen_hvm_smp_prepare_boot_cpu)
+ * and at restore (xen_vcpu_restore). Also called for hotplugged
+ * VCPUs (cpu_init -> xen_hvm_cpu_prepare_hvm).
+ * However, the hypercall can only be done once (see below) so if a VCPU
+ * is offlined and comes back online then let's not redo the hypercall.
*
* For PV it is called during restore (xen_vcpu_restore) and bootup
* (xen_setup_vcpu_info_placement). The hotplug mechanism does not
@@ -135,42 +203,44 @@ void xen_vcpu_setup(int cpu)
*/
if (xen_hvm_domain()) {
if (per_cpu(xen_vcpu, cpu) == &per_cpu(xen_vcpu_info, cpu))
- return;
+ return 0;
}
- if (xen_vcpu_nr(cpu) < MAX_VIRT_CPUS)
- per_cpu(xen_vcpu, cpu) =
- &HYPERVISOR_shared_info->vcpu_info[xen_vcpu_nr(cpu)];
- if (!xen_have_vcpu_info_placement) {
- if (cpu >= MAX_VIRT_CPUS)
- clamp_max_cpus();
- return;
+ if (xen_have_vcpu_info_placement) {
+ vcpup = &per_cpu(xen_vcpu_info, cpu);
+ info.mfn = arbitrary_virt_to_mfn(vcpup);
+ info.offset = offset_in_page(vcpup);
+
+ /*
+ * Check to see if the hypervisor will put the vcpu_info
+ * structure where we want it, which allows direct access via
+ * a percpu-variable.
+ * N.B. This hypercall can _only_ be called once per CPU.
+ * Subsequent calls will error out with -EINVAL. This is due to
+ * the fact that hypervisor has no unregister variant and this
+ * hypercall does not allow to over-write info.mfn and
+ * info.offset.
+ */
+ err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info,
+ xen_vcpu_nr(cpu), &info);
+
+ if (err) {
+ pr_warn_once("register_vcpu_info failed: cpu=%d err=%d\n",
+ cpu, err);
+ xen_have_vcpu_info_placement = 0;
+ } else {
+ /*
+ * This cpu is using the registered vcpu info, even if
+ * later ones fail to.
+ */
+ per_cpu(xen_vcpu, cpu) = vcpup;
+ }
}
- vcpup = &per_cpu(xen_vcpu_info, cpu);
- info.mfn = arbitrary_virt_to_mfn(vcpup);
- info.offset = offset_in_page(vcpup);
-
- /* Check to see if the hypervisor will put the vcpu_info
- structure where we want it, which allows direct access via
- a percpu-variable.
- N.B. This hypercall can _only_ be called once per CPU. Subsequent
- calls will error out with -EINVAL. This is due to the fact that
- hypervisor has no unregister variant and this hypercall does not
- allow to over-write info.mfn and info.offset.
- */
- err = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, xen_vcpu_nr(cpu),
- &info);
+ if (!xen_have_vcpu_info_placement)
+ xen_vcpu_info_reset(cpu);
- if (err) {
- printk(KERN_DEBUG "register_vcpu_info failed: err=%d\n", err);
- xen_have_vcpu_info_placement = 0;
- clamp_max_cpus();
- } else {
- /* This cpu is using the registered vcpu info, even if
- later ones fail to. */
- per_cpu(xen_vcpu, cpu) = vcpup;
- }
+ return ((per_cpu(xen_vcpu, cpu) == NULL) ? -ENODEV : 0);
}
void xen_reboot(int reason)
diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c
index a6d014f47e52..87d791356ea9 100644
--- a/arch/x86/xen/enlighten_hvm.c
+++ b/arch/x86/xen/enlighten_hvm.c
@@ -1,5 +1,6 @@
#include <linux/cpu.h>
#include <linux/kexec.h>
+#include <linux/memblock.h>
#include <xen/features.h>
#include <xen/events.h>
@@ -10,9 +11,11 @@
#include <asm/reboot.h>
#include <asm/setup.h>
#include <asm/hypervisor.h>
+#include <asm/e820/api.h>
#include <asm/xen/cpuid.h>
#include <asm/xen/hypervisor.h>
+#include <asm/xen/page.h>
#include "xen-ops.h"
#include "mmu.h"
@@ -20,37 +23,34 @@
void __ref xen_hvm_init_shared_info(void)
{
- int cpu;
struct xen_add_to_physmap xatp;
- static struct shared_info *shared_info_page;
+ u64 pa;
+
+ if (HYPERVISOR_shared_info == &xen_dummy_shared_info) {
+ /*
+ * Search for a free page starting at 4kB physical address.
+ * Low memory is preferred to avoid an EPT large page split up
+ * by the mapping.
+ * Starting below X86_RESERVE_LOW (usually 64kB) is fine as
+ * the BIOS used for HVM guests is well behaved and won't
+ * clobber memory other than the first 4kB.
+ */
+ for (pa = PAGE_SIZE;
+ !e820__mapped_all(pa, pa + PAGE_SIZE, E820_TYPE_RAM) ||
+ memblock_is_reserved(pa);
+ pa += PAGE_SIZE)
+ ;
+
+ memblock_reserve(pa, PAGE_SIZE);
+ HYPERVISOR_shared_info = __va(pa);
+ }
- if (!shared_info_page)
- shared_info_page = (struct shared_info *)
- extend_brk(PAGE_SIZE, PAGE_SIZE);
xatp.domid = DOMID_SELF;
xatp.idx = 0;
xatp.space = XENMAPSPACE_shared_info;
- xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
+ xatp.gpfn = virt_to_pfn(HYPERVISOR_shared_info);
if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
BUG();
-
- HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
-
- /* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
- * page, we use it in the event channel upcall and in some pvclock
- * related functions. We don't need the vcpu_info placement
- * optimizations because we don't use any pv_mmu or pv_irq op on
- * HVM.
- * When xen_hvm_init_shared_info is run at boot time only vcpu 0 is
- * online but xen_hvm_init_shared_info is run at resume time too and
- * in that case multiple vcpus might be online. */
- for_each_online_cpu(cpu) {
- /* Leave it to be NULL. */
- if (xen_vcpu_nr(cpu) >= MAX_VIRT_CPUS)
- continue;
- per_cpu(xen_vcpu, cpu) =
- &HYPERVISOR_shared_info->vcpu_info[xen_vcpu_nr(cpu)];
- }
}
static void __init init_hvm_pv_info(void)
@@ -106,7 +106,7 @@ static void xen_hvm_crash_shutdown(struct pt_regs *regs)
static int xen_cpu_up_prepare_hvm(unsigned int cpu)
{
- int rc;
+ int rc = 0;
/*
* This can happen if CPU was offlined earlier and
@@ -121,7 +121,9 @@ static int xen_cpu_up_prepare_hvm(unsigned int cpu)
per_cpu(xen_vcpu_id, cpu) = cpu_acpi_id(cpu);
else
per_cpu(xen_vcpu_id, cpu) = cpu;
- xen_vcpu_setup(cpu);
+ rc = xen_vcpu_setup(cpu);
+ if (rc)
+ return rc;
if (xen_have_vector_callback && xen_feature(XENFEAT_hvm_safe_pvclock))
xen_setup_timer(cpu);
@@ -130,9 +132,8 @@ static int xen_cpu_up_prepare_hvm(unsigned int cpu)
if (rc) {
WARN(1, "xen_smp_intr_init() for CPU %d failed: %d\n",
cpu, rc);
- return rc;
}
- return 0;
+ return rc;
}
static int xen_cpu_dead_hvm(unsigned int cpu)
@@ -154,6 +155,13 @@ static void __init xen_hvm_guest_init(void)
xen_hvm_init_shared_info();
+ /*
+ * xen_vcpu is a pointer to the vcpu_info struct in the shared_info
+ * page, we use it in the event channel upcall and in some pvclock
+ * related functions.
+ */
+ xen_vcpu_info_reset(0);
+
xen_panic_handler_init();
if (xen_feature(XENFEAT_hvm_callback_vector))
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index f33eef4ebd12..811e4ddb3f37 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -89,8 +89,6 @@
void *xen_initial_gdt;
-RESERVE_BRK(shared_info_page_brk, PAGE_SIZE);
-
static int xen_cpu_up_prepare_pv(unsigned int cpu);
static int xen_cpu_dead_pv(unsigned int cpu);
@@ -107,35 +105,6 @@ struct tls_descs {
*/
static DEFINE_PER_CPU(struct tls_descs, shadow_tls_desc);
-/*
- * On restore, set the vcpu placement up again.
- * If it fails, then we're in a bad state, since
- * we can't back out from using it...
- */
-void xen_vcpu_restore(void)
-{
- int cpu;
-
- for_each_possible_cpu(cpu) {
- bool other_cpu = (cpu != smp_processor_id());
- bool is_up = HYPERVISOR_vcpu_op(VCPUOP_is_up, xen_vcpu_nr(cpu),
- NULL);
-
- if (other_cpu && is_up &&
- HYPERVISOR_vcpu_op(VCPUOP_down, xen_vcpu_nr(cpu), NULL))
- BUG();
-
- xen_setup_runstate_info(cpu);
-
- if (xen_have_vcpu_info_placement)
- xen_vcpu_setup(cpu);
-
- if (other_cpu && is_up &&
- HYPERVISOR_vcpu_op(VCPUOP_up, xen_vcpu_nr(cpu), NULL))
- BUG();
- }
-}
-
static void __init xen_banner(void)
{
unsigned version = HYPERVISOR_xen_version(XENVER_version, NULL);
@@ -960,30 +929,43 @@ void xen_setup_shared_info(void)
HYPERVISOR_shared_info =
(struct shared_info *)fix_to_virt(FIX_PARAVIRT_BOOTMAP);
-#ifndef CONFIG_SMP
- /* In UP this is as good a place as any to set up shared info */
- xen_setup_vcpu_info_placement();
-#endif
-
xen_setup_mfn_list_list();
- /*
- * Now that shared info is set up we can start using routines that
- * point to pvclock area.
- */
- if (system_state == SYSTEM_BOOTING)
+ if (system_state == SYSTEM_BOOTING) {
+#ifndef CONFIG_SMP
+ /*
+ * In UP this is as good a place as any to set up shared info.
+ * Limit this to boot only, at restore vcpu setup is done via
+ * xen_vcpu_restore().
+ */
+ xen_setup_vcpu_info_placement();
+#endif
+ /*
+ * Now that shared info is set up we can start using routines
+ * that point to pvclock area.
+ */
xen_init_time_ops();
+ }
}
/* This is called once we have the cpu_possible_mask */
-void xen_setup_vcpu_info_placement(void)
+void __ref xen_setup_vcpu_info_placement(void)
{
int cpu;
for_each_possible_cpu(cpu) {
/* Set up direct vCPU id mapping for PV guests. */
per_cpu(xen_vcpu_id, cpu) = cpu;
- xen_vcpu_setup(cpu);
+
+ /*
+ * xen_vcpu_setup(cpu) can fail -- in which case it
+ * falls back to the shared_info version for cpus
+ * where xen_vcpu_nr(cpu) < MAX_VIRT_CPUS.
+ *
+ * xen_cpu_up_prepare_pv() handles the rest by failing
+ * them in hotplug.
+ */
+ (void) xen_vcpu_setup(cpu);
}
/*
@@ -1332,9 +1314,17 @@ asmlinkage __visible void __init xen_start_kernel(void)
*/
acpi_numa = -1;
#endif
- /* Don't do the full vcpu_info placement stuff until we have a
- possible map and a non-dummy shared_info. */
- per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
+ /* Let's presume PV guests always boot on vCPU with id 0. */
+ per_cpu(xen_vcpu_id, 0) = 0;
+
+ /*
+ * Setup xen_vcpu early because start_kernel needs it for
+ * local_irq_disable(), irqs_disabled().
+ *
+ * Don't do the full vcpu_info placement stuff until we have
+ * the cpu_possible_mask and a non-dummy shared_info.
+ */
+ xen_vcpu_info_reset(0);
WARN_ON(xen_cpuhp_setup(xen_cpu_up_prepare_pv, xen_cpu_dead_pv));
@@ -1431,9 +1421,7 @@ asmlinkage __visible void __init xen_start_kernel(void)
#endif
xen_raw_console_write("about to get started...\n");
- /* Let's presume PV guests always boot on vCPU with id 0. */
- per_cpu(xen_vcpu_id, 0) = 0;
-
+ /* We need this for printk timestamps */
xen_setup_runstate_info(0);
xen_efi_init();
@@ -1451,6 +1439,9 @@ static int xen_cpu_up_prepare_pv(unsigned int cpu)
{
int rc;
+ if (per_cpu(xen_vcpu, cpu) == NULL)
+ return -ENODEV;
+
xen_setup_timer(cpu);
rc = xen_smp_intr_init(cpu);
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index a5bf7c451435..c81046323ebc 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -499,7 +499,7 @@ static unsigned long __init xen_foreach_remap_area(unsigned long nr_pages,
void __init xen_remap_memory(void)
{
unsigned long buf = (unsigned long)&xen_remap_buf;
- unsigned long mfn_save, mfn, pfn;
+ unsigned long mfn_save, pfn;
unsigned long remapped = 0;
unsigned int i;
unsigned long pfn_s = ~0UL;
@@ -515,8 +515,7 @@ void __init xen_remap_memory(void)
pfn = xen_remap_buf.target_pfn;
for (i = 0; i < xen_remap_buf.size; i++) {
- mfn = xen_remap_buf.mfns[i];
- xen_update_mem_tables(pfn, mfn);
+ xen_update_mem_tables(pfn, xen_remap_buf.mfns[i]);
remapped++;
pfn++;
}
@@ -530,8 +529,6 @@ void __init xen_remap_memory(void)
pfn_s = xen_remap_buf.target_pfn;
len = xen_remap_buf.size;
}
-
- mfn = xen_remap_mfn;
xen_remap_mfn = xen_remap_buf.next_area_mfn;
}
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 82ac611f2fc1..e7f02eb73727 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -1,4 +1,5 @@
#include <linux/smp.h>
+#include <linux/cpu.h>
#include <linux/slab.h>
#include <linux/cpumask.h>
#include <linux/percpu.h>
@@ -114,6 +115,36 @@ int xen_smp_intr_init(unsigned int cpu)
return rc;
}
+void __init xen_smp_cpus_done(unsigned int max_cpus)
+{
+ int cpu, rc, count = 0;
+
+ if (xen_hvm_domain())
+ native_smp_cpus_done(max_cpus);
+
+ if (xen_have_vcpu_info_placement)
+ return;
+
+ for_each_online_cpu(cpu) {
+ if (xen_vcpu_nr(cpu) < MAX_VIRT_CPUS)
+ continue;
+
+ rc = cpu_down(cpu);
+
+ if (rc == 0) {
+ /*
+ * Reset vcpu_info so this cpu cannot be onlined again.
+ */
+ xen_vcpu_info_reset(cpu);
+ count++;
+ } else {
+ pr_warn("%s: failed to bring CPU %d down, error %d\n",
+ __func__, cpu, rc);
+ }
+ }
+ WARN(count, "%s: brought %d CPUs offline\n", __func__, count);
+}
+
void xen_smp_send_reschedule(int cpu)
{
xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
diff --git a/arch/x86/xen/smp.h b/arch/x86/xen/smp.h
index 8ebb6acca64a..87d3c76cba37 100644
--- a/arch/x86/xen/smp.h
+++ b/arch/x86/xen/smp.h
@@ -14,6 +14,8 @@ extern void xen_smp_intr_free(unsigned int cpu);
int xen_smp_intr_init_pv(unsigned int cpu);
void xen_smp_intr_free_pv(unsigned int cpu);
+void xen_smp_cpus_done(unsigned int max_cpus);
+
void xen_smp_send_reschedule(int cpu);
void xen_smp_send_call_function_ipi(const struct cpumask *mask);
void xen_smp_send_call_function_single_ipi(int cpu);
diff --git a/arch/x86/xen/smp_hvm.c b/arch/x86/xen/smp_hvm.c
index f18561bbf5c9..fd60abedf658 100644
--- a/arch/x86/xen/smp_hvm.c
+++ b/arch/x86/xen/smp_hvm.c
@@ -12,7 +12,8 @@ static void __init xen_hvm_smp_prepare_boot_cpu(void)
native_smp_prepare_boot_cpu();
/*
- * Setup vcpu_info for boot CPU.
+ * Setup vcpu_info for boot CPU. Secondary CPUs get their vcpu_info
+ * in xen_cpu_up_prepare_hvm().
*/
xen_vcpu_setup(0);
@@ -27,10 +28,20 @@ static void __init xen_hvm_smp_prepare_boot_cpu(void)
static void __init xen_hvm_smp_prepare_cpus(unsigned int max_cpus)
{
+ int cpu;
+
native_smp_prepare_cpus(max_cpus);
WARN_ON(xen_smp_intr_init(0));
xen_init_lock_cpu(0);
+
+ for_each_possible_cpu(cpu) {
+ if (cpu == 0)
+ continue;
+
+ /* Set default vcpu_id to make sure that we don't use cpu-0's */
+ per_cpu(xen_vcpu_id, cpu) = XEN_VCPU_ID_INVALID;
+ }
}
#ifdef CONFIG_HOTPLUG_CPU
@@ -60,4 +71,5 @@ void __init xen_hvm_smp_init(void)
smp_ops.send_call_func_ipi = xen_smp_send_call_function_ipi;
smp_ops.send_call_func_single_ipi = xen_smp_send_call_function_single_ipi;
smp_ops.smp_prepare_boot_cpu = xen_hvm_smp_prepare_boot_cpu;
+ smp_ops.smp_cpus_done = xen_smp_cpus_done;
}
diff --git a/arch/x86/xen/smp_pv.c b/arch/x86/xen/smp_pv.c
index aae32535f4ec..1ea598e5f030 100644
--- a/arch/x86/xen/smp_pv.c
+++ b/arch/x86/xen/smp_pv.c
@@ -371,10 +371,6 @@ static int xen_pv_cpu_up(unsigned int cpu, struct task_struct *idle)
return 0;
}
-static void xen_pv_smp_cpus_done(unsigned int max_cpus)
-{
-}
-
#ifdef CONFIG_HOTPLUG_CPU
static int xen_pv_cpu_disable(void)
{
@@ -469,7 +465,7 @@ static irqreturn_t xen_irq_work_interrupt(int irq, void *dev_id)
static const struct smp_ops xen_smp_ops __initconst = {
.smp_prepare_boot_cpu = xen_pv_smp_prepare_boot_cpu,
.smp_prepare_cpus = xen_pv_smp_prepare_cpus,
- .smp_cpus_done = xen_pv_smp_cpus_done,
+ .smp_cpus_done = xen_smp_cpus_done,
.cpu_up = xen_pv_cpu_up,
.cpu_die = xen_pv_cpu_die,
diff --git a/arch/x86/xen/suspend_hvm.c b/arch/x86/xen/suspend_hvm.c
index 01afcadde50a..484999416d8b 100644
--- a/arch/x86/xen/suspend_hvm.c
+++ b/arch/x86/xen/suspend_hvm.c
@@ -8,15 +8,10 @@
void xen_hvm_post_suspend(int suspend_cancelled)
{
- int cpu;
-
- if (!suspend_cancelled)
+ if (!suspend_cancelled) {
xen_hvm_init_shared_info();
+ xen_vcpu_restore();
+ }
xen_callback_vector();
xen_unplug_emulated_devices();
- if (xen_feature(XENFEAT_hvm_safe_pvclock)) {
- for_each_online_cpu(cpu) {
- xen_setup_runstate_info(cpu);
- }
- }
}
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 9a440a42c618..0d5004477db6 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -78,7 +78,8 @@ bool xen_vcpu_stolen(int vcpu);
extern int xen_have_vcpu_info_placement;
-void xen_vcpu_setup(int cpu);
+int xen_vcpu_setup(int cpu);
+void xen_vcpu_info_reset(int cpu);
void xen_setup_vcpu_info_placement(void);
#ifdef CONFIG_SMP
diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c
index 2e567d8433b3..b241bfa529ce 100644
--- a/drivers/xen/events/events_base.c
+++ b/drivers/xen/events/events_base.c
@@ -1303,10 +1303,9 @@ void rebind_evtchn_irq(int evtchn, int irq)
}
/* Rebind an evtchn so that it gets delivered to a specific cpu */
-static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
+int xen_rebind_evtchn_to_cpu(int evtchn, unsigned tcpu)
{
struct evtchn_bind_vcpu bind_vcpu;
- int evtchn = evtchn_from_irq(irq);
int masked;
if (!VALID_EVTCHN(evtchn))
@@ -1338,12 +1337,13 @@ static int rebind_irq_to_cpu(unsigned irq, unsigned tcpu)
return 0;
}
+EXPORT_SYMBOL_GPL(xen_rebind_evtchn_to_cpu);
static int set_affinity_irq(struct irq_data *data, const struct cpumask *dest,
bool force)
{
unsigned tcpu = cpumask_first_and(dest, cpu_online_mask);
- int ret = rebind_irq_to_cpu(data->irq, tcpu);
+ int ret = xen_rebind_evtchn_to_cpu(evtchn_from_irq(data->irq), tcpu);
if (!ret)
irq_data_update_effective_affinity(data, cpumask_of(tcpu));
diff --git a/drivers/xen/evtchn.c b/drivers/xen/evtchn.c
index 10f1ef582659..9729a64ea1a9 100644
--- a/drivers/xen/evtchn.c
+++ b/drivers/xen/evtchn.c
@@ -421,6 +421,36 @@ static void evtchn_unbind_from_user(struct per_user_data *u,
del_evtchn(u, evtchn);
}
+static DEFINE_PER_CPU(int, bind_last_selected_cpu);
+
+static void evtchn_bind_interdom_next_vcpu(int evtchn)
+{
+ unsigned int selected_cpu, irq;
+ struct irq_desc *desc;
+ unsigned long flags;
+
+ irq = irq_from_evtchn(evtchn);
+ desc = irq_to_desc(irq);
+
+ if (!desc)
+ return;
+
+ raw_spin_lock_irqsave(&desc->lock, flags);
+ selected_cpu = this_cpu_read(bind_last_selected_cpu);
+ selected_cpu = cpumask_next_and(selected_cpu,
+ desc->irq_common_data.affinity, cpu_online_mask);
+
+ if (unlikely(selected_cpu >= nr_cpu_ids))
+ selected_cpu = cpumask_first_and(desc->irq_common_data.affinity,
+ cpu_online_mask);
+
+ this_cpu_write(bind_last_selected_cpu, selected_cpu);
+
+ /* unmask expects irqs to be disabled */
+ xen_rebind_evtchn_to_cpu(evtchn, selected_cpu);
+ raw_spin_unlock_irqrestore(&desc->lock, flags);
+}
+
static long evtchn_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
@@ -478,8 +508,10 @@ static long evtchn_ioctl(struct file *file,
break;
rc = evtchn_bind_to_user(u, bind_interdomain.local_port);
- if (rc == 0)
+ if (rc == 0) {
rc = bind_interdomain.local_port;
+ evtchn_bind_interdom_next_vcpu(rc);
+ }
break;
}
diff --git a/drivers/xen/manage.c b/drivers/xen/manage.c
index 9e35032351a0..c425d03d37d2 100644
--- a/drivers/xen/manage.c
+++ b/drivers/xen/manage.c
@@ -278,8 +278,16 @@ static void sysrq_handler(struct xenbus_watch *watch, const char *path,
err = xenbus_transaction_start(&xbt);
if (err)
return;
- if (xenbus_scanf(xbt, "control", "sysrq", "%c", &sysrq_key) < 0) {
- pr_err("Unable to read sysrq code in control/sysrq\n");
+ err = xenbus_scanf(xbt, "control", "sysrq", "%c", &sysrq_key);
+ if (err < 0) {
+ /*
+ * The Xenstore watch fires directly after registering it and
+ * after a suspend/resume cycle. So ENOENT is no error but
+ * might happen in those cases.
+ */
+ if (err != -ENOENT)
+ pr_err("Error %d reading sysrq code in control/sysrq\n",
+ err);
xenbus_transaction_end(xbt, 1);
return;
}
diff --git a/drivers/xen/sys-hypervisor.c b/drivers/xen/sys-hypervisor.c
index 84106f9c456c..9d314bba7c4e 100644
--- a/drivers/xen/sys-hypervisor.c
+++ b/drivers/xen/sys-hypervisor.c
@@ -50,6 +50,35 @@ static int __init xen_sysfs_type_init(void)
return sysfs_create_file(hypervisor_kobj, &type_attr.attr);
}
+static ssize_t guest_type_show(struct hyp_sysfs_attr *attr, char *buffer)
+{
+ const char *type;
+
+ switch (xen_domain_type) {
+ case XEN_NATIVE:
+ /* ARM only. */
+ type = "Xen";
+ break;
+ case XEN_PV_DOMAIN:
+ type = "PV";
+ break;
+ case XEN_HVM_DOMAIN:
+ type = xen_pvh_domain() ? "PVH" : "HVM";
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return sprintf(buffer, "%s\n", type);
+}
+
+HYPERVISOR_ATTR_RO(guest_type);
+
+static int __init xen_sysfs_guest_type_init(void)
+{
+ return sysfs_create_file(hypervisor_kobj, &guest_type_attr.attr);
+}
+
/* xen version attributes */
static ssize_t major_show(struct hyp_sysfs_attr *attr, char *buffer)
{
@@ -327,12 +356,40 @@ static ssize_t features_show(struct hyp_sysfs_attr *attr, char *buffer)
HYPERVISOR_ATTR_RO(features);
+static ssize_t buildid_show(struct hyp_sysfs_attr *attr, char *buffer)
+{
+ ssize_t ret;
+ struct xen_build_id *buildid;
+
+ ret = HYPERVISOR_xen_version(XENVER_build_id, NULL);
+ if (ret < 0) {
+ if (ret == -EPERM)
+ ret = sprintf(buffer, "<denied>");
+ return ret;
+ }
+
+ buildid = kmalloc(sizeof(*buildid) + ret, GFP_KERNEL);
+ if (!buildid)
+ return -ENOMEM;
+
+ buildid->len = ret;
+ ret = HYPERVISOR_xen_version(XENVER_build_id, buildid);
+ if (ret > 0)
+ ret = sprintf(buffer, "%s", buildid->buf);
+ kfree(buildid);
+
+ return ret;
+}
+
+HYPERVISOR_ATTR_RO(buildid);
+
static struct attribute *xen_properties_attrs[] = {
&capabilities_attr.attr,
&changeset_attr.attr,
&virtual_start_attr.attr,
&pagesize_attr.attr,
&features_attr.attr,
+ &buildid_attr.attr,
NULL
};
@@ -471,6 +528,9 @@ static int __init hyper_sysfs_init(void)
ret = xen_sysfs_type_init();
if (ret)
goto out;
+ ret = xen_sysfs_guest_type_init();
+ if (ret)
+ goto guest_type_out;
ret = xen_sysfs_version_init();
if (ret)
goto version_out;
@@ -502,6 +562,8 @@ uuid_out:
comp_out:
sysfs_remove_group(hypervisor_kobj, &version_group);
version_out:
+ sysfs_remove_file(hypervisor_kobj, &guest_type_attr.attr);
+guest_type_out:
sysfs_remove_file(hypervisor_kobj, &type_attr.attr);
out:
return ret;
diff --git a/drivers/xen/xenbus/xenbus_comms.c b/drivers/xen/xenbus/xenbus_comms.c
index 856ada5d39c9..5b081a01779d 100644
--- a/drivers/xen/xenbus/xenbus_comms.c
+++ b/drivers/xen/xenbus/xenbus_comms.c
@@ -299,17 +299,7 @@ static int process_msg(void)
mutex_lock(&xb_write_mutex);
list_for_each_entry(req, &xs_reply_list, list) {
if (req->msg.req_id == state.msg.req_id) {
- if (req->state == xb_req_state_wait_reply) {
- req->msg.type = state.msg.type;
- req->msg.len = state.msg.len;
- req->body = state.body;
- req->state = xb_req_state_got_reply;
- list_del(&req->list);
- req->cb(req);
- } else {
- list_del(&req->list);
- kfree(req);
- }
+ list_del(&req->list);
err = 0;
break;
}
@@ -317,6 +307,15 @@ static int process_msg(void)
mutex_unlock(&xb_write_mutex);
if (err)
goto out;
+
+ if (req->state == xb_req_state_wait_reply) {
+ req->msg.type = state.msg.type;
+ req->msg.len = state.msg.len;
+ req->body = state.body;
+ req->state = xb_req_state_got_reply;
+ req->cb(req);
+ } else
+ kfree(req);
}
mutex_unlock(&xs_response_mutex);
diff --git a/include/xen/arm/hypercall.h b/include/xen/arm/hypercall.h
index 73db4b2eeb89..b40485e54d80 100644
--- a/include/xen/arm/hypercall.h
+++ b/include/xen/arm/hypercall.h
@@ -39,6 +39,8 @@
#include <xen/interface/sched.h>
#include <xen/interface/platform.h>
+struct xen_dm_op_buf;
+
long privcmd_call(unsigned call, unsigned long a1,
unsigned long a2, unsigned long a3,
unsigned long a4, unsigned long a5);
@@ -53,7 +55,8 @@ int HYPERVISOR_physdev_op(int cmd, void *arg);
int HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args);
int HYPERVISOR_tmem_op(void *arg);
int HYPERVISOR_vm_assist(unsigned int cmd, unsigned int type);
-int HYPERVISOR_dm_op(domid_t domid, unsigned int nr_bufs, void *bufs);
+int HYPERVISOR_dm_op(domid_t domid, unsigned int nr_bufs,
+ struct xen_dm_op_buf *bufs);
int HYPERVISOR_platform_op_raw(void *arg);
static inline int HYPERVISOR_platform_op(struct xen_platform_op *op)
{
diff --git a/include/xen/events.h b/include/xen/events.h
index 88da2abaf535..f442ca5fcd82 100644
--- a/include/xen/events.h
+++ b/include/xen/events.h
@@ -58,6 +58,7 @@ void evtchn_put(unsigned int evtchn);
void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector);
void rebind_evtchn_irq(int evtchn, int irq);
+int xen_rebind_evtchn_to_cpu(int evtchn, unsigned tcpu);
static inline void notify_remote_via_evtchn(int port)
{
diff --git a/include/xen/interface/version.h b/include/xen/interface/version.h
index 7ff6498679a3..145f12f9ecec 100644
--- a/include/xen/interface/version.h
+++ b/include/xen/interface/version.h
@@ -63,4 +63,19 @@ struct xen_feature_info {
/* arg == xen_domain_handle_t. */
#define XENVER_guest_handle 8
+#define XENVER_commandline 9
+struct xen_commandline {
+ char buf[1024];
+};
+
+/*
+ * Return value is the number of bytes written, or XEN_Exx on error.
+ * Calling with empty parameter returns the size of build_id.
+ */
+#define XENVER_build_id 10
+struct xen_build_id {
+ uint32_t len; /* IN: size of buf[]. */
+ unsigned char buf[];
+};
+
#endif /* __XEN_PUBLIC_VERSION_H__ */
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index c44a2ee8c8f8..218e6aae5433 100644
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -15,6 +15,8 @@ static inline uint32_t xen_vcpu_nr(int cpu)
return per_cpu(xen_vcpu_id, cpu);
}
+#define XEN_VCPU_ID_INVALID U32_MAX
+
void xen_arch_pre_suspend(void);
void xen_arch_post_suspend(int suspend_cancelled);