KVM vCPU creation is done once during the vCPU realization when Qemu vCPU thread
is spawned. This is common to all the architectures as of now.
Hot-unplug of vCPU results in destruction of the vCPU object in QOM but the
corresponding KVM vCPU object in the Host KVM is not destroyed as KVM doesn't
support vCPU removal. Therefore, its representative KVM vCPU object/context in
Qemu is parked.
Refactor architecture common logic so that some APIs could be reused by vCPU
Hotplug code of some architectures likes ARM, Loongson etc. Update new/old APIs
with trace events. New APIs qemu_{create,park,unpark}_vcpu() can be externally
called. No functional change is intended here.
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Tested-by: Vishnu Pajjuri <vishnu@os.amperecomputing.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Tested-by: Xianglai Li <lixianglai@loongson.cn>
Tested-by: Miguel Luis <miguel.luis@oracle.com>
Reviewed-by: Shaoqin Huang <shahuang@redhat.com>
Reviewed-by: Vishnu Pajjuri <vishnu@os.amperecomputing.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Tested-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
---
accel/kvm/kvm-all.c | 95 ++++++++++++++++++++++++++++--------------
accel/kvm/kvm-cpus.h | 1 -
accel/kvm/trace-events | 5 ++-
include/sysemu/kvm.h | 25 +++++++++++
4 files changed, 92 insertions(+), 34 deletions(-)
diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index 2b4ab89679..e446d18944 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -340,14 +340,71 @@ err:
return ret;
}
+void kvm_park_vcpu(CPUState *cpu)
+{
+ struct KVMParkedVcpu *vcpu;
+
+ trace_kvm_park_vcpu(cpu->cpu_index, kvm_arch_vcpu_id(cpu));
+
+ vcpu = g_malloc0(sizeof(*vcpu));
+ vcpu->vcpu_id = kvm_arch_vcpu_id(cpu);
+ vcpu->kvm_fd = cpu->kvm_fd;
+ QLIST_INSERT_HEAD(&kvm_state->kvm_parked_vcpus, vcpu, node);
+}
+
+int kvm_unpark_vcpu(KVMState *s, unsigned long vcpu_id)
+{
+ struct KVMParkedVcpu *cpu;
+ int kvm_fd = -ENOENT;
+
+ QLIST_FOREACH(cpu, &s->kvm_parked_vcpus, node) {
+ if (cpu->vcpu_id == vcpu_id) {
+ QLIST_REMOVE(cpu, node);
+ kvm_fd = cpu->kvm_fd;
+ g_free(cpu);
+ }
+ }
+
+ trace_kvm_unpark_vcpu(vcpu_id, kvm_fd > 0 ? "unparked" : "not found parked");
+
+ return kvm_fd;
+}
+
+int kvm_create_vcpu(CPUState *cpu)
+{
+ unsigned long vcpu_id = kvm_arch_vcpu_id(cpu);
+ KVMState *s = kvm_state;
+ int kvm_fd;
+
+ /* check if the KVM vCPU already exist but is parked */
+ kvm_fd = kvm_unpark_vcpu(s, vcpu_id);
+ if (kvm_fd < 0) {
+ /* vCPU not parked: create a new KVM vCPU */
+ kvm_fd = kvm_vm_ioctl(s, KVM_CREATE_VCPU, vcpu_id);
+ if (kvm_fd < 0) {
+ error_report("KVM_CREATE_VCPU IOCTL failed for vCPU %lu", vcpu_id);
+ return kvm_fd;
+ }
+ }
+
+ cpu->kvm_fd = kvm_fd;
+ cpu->kvm_state = s;
+ cpu->vcpu_dirty = true;
+ cpu->dirty_pages = 0;
+ cpu->throttle_us_per_full = 0;
+
+ trace_kvm_create_vcpu(cpu->cpu_index, vcpu_id, kvm_fd);
+
+ return 0;
+}
+
static int do_kvm_destroy_vcpu(CPUState *cpu)
{
KVMState *s = kvm_state;
long mmap_size;
- struct KVMParkedVcpu *vcpu = NULL;
int ret = 0;
- trace_kvm_destroy_vcpu();
+ trace_kvm_destroy_vcpu(cpu->cpu_index, kvm_arch_vcpu_id(cpu));
ret = kvm_arch_destroy_vcpu(cpu);
if (ret < 0) {
@@ -373,10 +430,7 @@ static int do_kvm_destroy_vcpu(CPUState *cpu)
}
}
- vcpu = g_malloc0(sizeof(*vcpu));
- vcpu->vcpu_id = kvm_arch_vcpu_id(cpu);
- vcpu->kvm_fd = cpu->kvm_fd;
- QLIST_INSERT_HEAD(&kvm_state->kvm_parked_vcpus, vcpu, node);
+ kvm_park_vcpu(cpu);
err:
return ret;
}
@@ -389,24 +443,6 @@ void kvm_destroy_vcpu(CPUState *cpu)
}
}
-static int kvm_get_vcpu(KVMState *s, unsigned long vcpu_id)
-{
- struct KVMParkedVcpu *cpu;
-
- QLIST_FOREACH(cpu, &s->kvm_parked_vcpus, node) {
- if (cpu->vcpu_id == vcpu_id) {
- int kvm_fd;
-
- QLIST_REMOVE(cpu, node);
- kvm_fd = cpu->kvm_fd;
- g_free(cpu);
- return kvm_fd;
- }
- }
-
- return kvm_vm_ioctl(s, KVM_CREATE_VCPU, (void *)vcpu_id);
-}
-
int kvm_init_vcpu(CPUState *cpu, Error **errp)
{
KVMState *s = kvm_state;
@@ -415,19 +451,14 @@ int kvm_init_vcpu(CPUState *cpu, Error **errp)
trace_kvm_init_vcpu(cpu->cpu_index, kvm_arch_vcpu_id(cpu));
- ret = kvm_get_vcpu(s, kvm_arch_vcpu_id(cpu));
+ ret = kvm_create_vcpu(cpu);
if (ret < 0) {
- error_setg_errno(errp, -ret, "kvm_init_vcpu: kvm_get_vcpu failed (%lu)",
+ error_setg_errno(errp, -ret,
+ "kvm_init_vcpu: kvm_create_vcpu failed (%lu)",
kvm_arch_vcpu_id(cpu));
goto err;
}
- cpu->kvm_fd = ret;
- cpu->kvm_state = s;
- cpu->vcpu_dirty = true;
- cpu->dirty_pages = 0;
- cpu->throttle_us_per_full = 0;
-
mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
if (mmap_size < 0) {
ret = mmap_size;
diff --git a/accel/kvm/kvm-cpus.h b/accel/kvm/kvm-cpus.h
index ca40add32c..171b22fd29 100644
--- a/accel/kvm/kvm-cpus.h
+++ b/accel/kvm/kvm-cpus.h
@@ -22,5 +22,4 @@ bool kvm_supports_guest_debug(void);
int kvm_insert_breakpoint(CPUState *cpu, int type, vaddr addr, vaddr len);
int kvm_remove_breakpoint(CPUState *cpu, int type, vaddr addr, vaddr len);
void kvm_remove_all_breakpoints(CPUState *cpu);
-
#endif /* KVM_CPUS_H */
diff --git a/accel/kvm/trace-events b/accel/kvm/trace-events
index 681ccb667d..37626c1ac5 100644
--- a/accel/kvm/trace-events
+++ b/accel/kvm/trace-events
@@ -9,6 +9,10 @@ kvm_device_ioctl(int fd, int type, void *arg) "dev fd %d, type 0x%x, arg %p"
kvm_failed_reg_get(uint64_t id, const char *msg) "Warning: Unable to retrieve ONEREG %" PRIu64 " from KVM: %s"
kvm_failed_reg_set(uint64_t id, const char *msg) "Warning: Unable to set ONEREG %" PRIu64 " to KVM: %s"
kvm_init_vcpu(int cpu_index, unsigned long arch_cpu_id) "index: %d id: %lu"
+kvm_create_vcpu(int cpu_index, unsigned long arch_cpu_id, int kvm_fd) "index: %d, id: %lu, kvm fd: %d"
+kvm_destroy_vcpu(int cpu_index, unsigned long arch_cpu_id) "index: %d id: %lu"
+kvm_park_vcpu(int cpu_index, unsigned long arch_cpu_id) "index: %d id: %lu"
+kvm_unpark_vcpu(unsigned long arch_cpu_id, const char *msg) "id: %lu %s"
kvm_irqchip_commit_routes(void) ""
kvm_irqchip_add_msi_route(char *name, int vector, int virq) "dev %s vector %d virq %d"
kvm_irqchip_update_msi_route(int virq) "Updating MSI route virq=%d"
@@ -25,7 +29,6 @@ kvm_dirty_ring_reaper(const char *s) "%s"
kvm_dirty_ring_reap(uint64_t count, int64_t t) "reaped %"PRIu64" pages (took %"PRIi64" us)"
kvm_dirty_ring_reaper_kick(const char *reason) "%s"
kvm_dirty_ring_flush(int finished) "%d"
-kvm_destroy_vcpu(void) ""
kvm_failed_get_vcpu_mmap_size(void) ""
kvm_cpu_exec(void) ""
kvm_interrupt_exit_request(void) ""
diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
index c31d9c7356..c4a914b3d8 100644
--- a/include/sysemu/kvm.h
+++ b/include/sysemu/kvm.h
@@ -313,6 +313,31 @@ int kvm_create_device(KVMState *s, uint64_t type, bool test);
*/
bool kvm_device_supported(int vmfd, uint64_t type);
+/**
+ * kvm_create_vcpu - Gets a parked KVM vCPU or creates a KVM vCPU
+ * @cpu: QOM CPUState object for which KVM vCPU has to be fetched/created.
+ *
+ * @returns: 0 when success, errno (<0) when failed.
+ */
+int kvm_create_vcpu(CPUState *cpu);
+
+/**
+ * kvm_park_vcpu - Park QEMU KVM vCPU context
+ * @cpu: QOM CPUState object for which QEMU KVM vCPU context has to be parked.
+ *
+ * @returns: none
+ */
+void kvm_park_vcpu(CPUState *cpu);
+
+/**
+ * kvm_unpark_vcpu - unpark QEMU KVM vCPU context
+ * @s: KVM State
+ * @vcpu_id: Architecture vCPU ID of the parked vCPU
+ *
+ * @returns: KVM fd
+ */
+int kvm_unpark_vcpu(KVMState *s, unsigned long vcpu_id);
+
/* Arch specific hooks */
extern const KVMCapabilityInfo kvm_arch_required_capabilities[];
--
2.34.1On Sat, 13 Jul 2024 19:25:10 +0100
Salil Mehta <salil.mehta@huawei.com> wrote:
> KVM vCPU creation is done once during the vCPU realization when Qemu vCPU thread
> is spawned. This is common to all the architectures as of now.
>
> Hot-unplug of vCPU results in destruction of the vCPU object in QOM but the
> corresponding KVM vCPU object in the Host KVM is not destroyed as KVM doesn't
> support vCPU removal. Therefore, its representative KVM vCPU object/context in
> Qemu is parked.
>
> Refactor architecture common logic so that some APIs could be reused by vCPU
> Hotplug code of some architectures likes ARM, Loongson etc. Update new/old APIs
> with trace events. New APIs qemu_{create,park,unpark}_vcpu() can be externally
> called. No functional change is intended here.
>
> Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
> Reviewed-by: Gavin Shan <gshan@redhat.com>
> Tested-by: Vishnu Pajjuri <vishnu@os.amperecomputing.com>
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> Tested-by: Xianglai Li <lixianglai@loongson.cn>
> Tested-by: Miguel Luis <miguel.luis@oracle.com>
> Reviewed-by: Shaoqin Huang <shahuang@redhat.com>
> Reviewed-by: Vishnu Pajjuri <vishnu@os.amperecomputing.com>
> Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
> Tested-by: Zhao Liu <zhao1.liu@intel.com>
> Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
> Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
> ---
> accel/kvm/kvm-all.c | 95 ++++++++++++++++++++++++++++--------------
> accel/kvm/kvm-cpus.h | 1 -
> accel/kvm/trace-events | 5 ++-
> include/sysemu/kvm.h | 25 +++++++++++
> 4 files changed, 92 insertions(+), 34 deletions(-)
>
> diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
> index 2b4ab89679..e446d18944 100644
> --- a/accel/kvm/kvm-all.c
> +++ b/accel/kvm/kvm-all.c
> @@ -340,14 +340,71 @@ err:
> return ret;
> }
>
> +void kvm_park_vcpu(CPUState *cpu)
> +{
> + struct KVMParkedVcpu *vcpu;
> +
> + trace_kvm_park_vcpu(cpu->cpu_index, kvm_arch_vcpu_id(cpu));
> +
> + vcpu = g_malloc0(sizeof(*vcpu));
> + vcpu->vcpu_id = kvm_arch_vcpu_id(cpu);
> + vcpu->kvm_fd = cpu->kvm_fd;
> + QLIST_INSERT_HEAD(&kvm_state->kvm_parked_vcpus, vcpu, node);
> +}
> +
> +int kvm_unpark_vcpu(KVMState *s, unsigned long vcpu_id)
> +{
> + struct KVMParkedVcpu *cpu;
> + int kvm_fd = -ENOENT;
> +
> + QLIST_FOREACH(cpu, &s->kvm_parked_vcpus, node) {
> + if (cpu->vcpu_id == vcpu_id) {
> + QLIST_REMOVE(cpu, node);
> + kvm_fd = cpu->kvm_fd;
> + g_free(cpu);
> + }
> + }
> +
> + trace_kvm_unpark_vcpu(vcpu_id, kvm_fd > 0 ? "unparked" : "not found parked");
> +
> + return kvm_fd;
> +}
> +
> +int kvm_create_vcpu(CPUState *cpu)
> +{
> + unsigned long vcpu_id = kvm_arch_vcpu_id(cpu);
> + KVMState *s = kvm_state;
> + int kvm_fd;
> +
> + /* check if the KVM vCPU already exist but is parked */
> + kvm_fd = kvm_unpark_vcpu(s, vcpu_id);
> + if (kvm_fd < 0) {
> + /* vCPU not parked: create a new KVM vCPU */
> + kvm_fd = kvm_vm_ioctl(s, KVM_CREATE_VCPU, vcpu_id);
> + if (kvm_fd < 0) {
> + error_report("KVM_CREATE_VCPU IOCTL failed for vCPU %lu", vcpu_id);
> + return kvm_fd;
> + }
> + }
> +
> + cpu->kvm_fd = kvm_fd;
> + cpu->kvm_state = s;
> + cpu->vcpu_dirty = true;
> + cpu->dirty_pages = 0;
> + cpu->throttle_us_per_full = 0;
> +
> + trace_kvm_create_vcpu(cpu->cpu_index, vcpu_id, kvm_fd);
> +
> + return 0;
> +}
> +
> static int do_kvm_destroy_vcpu(CPUState *cpu)
> {
> KVMState *s = kvm_state;
> long mmap_size;
> - struct KVMParkedVcpu *vcpu = NULL;
> int ret = 0;
>
> - trace_kvm_destroy_vcpu();
> + trace_kvm_destroy_vcpu(cpu->cpu_index, kvm_arch_vcpu_id(cpu));
>
> ret = kvm_arch_destroy_vcpu(cpu);
> if (ret < 0) {
> @@ -373,10 +430,7 @@ static int do_kvm_destroy_vcpu(CPUState *cpu)
> }
> }
>
> - vcpu = g_malloc0(sizeof(*vcpu));
> - vcpu->vcpu_id = kvm_arch_vcpu_id(cpu);
> - vcpu->kvm_fd = cpu->kvm_fd;
> - QLIST_INSERT_HEAD(&kvm_state->kvm_parked_vcpus, vcpu, node);
> + kvm_park_vcpu(cpu);
> err:
> return ret;
> }
> @@ -389,24 +443,6 @@ void kvm_destroy_vcpu(CPUState *cpu)
> }
> }
>
> -static int kvm_get_vcpu(KVMState *s, unsigned long vcpu_id)
> -{
> - struct KVMParkedVcpu *cpu;
> -
> - QLIST_FOREACH(cpu, &s->kvm_parked_vcpus, node) {
> - if (cpu->vcpu_id == vcpu_id) {
> - int kvm_fd;
> -
> - QLIST_REMOVE(cpu, node);
> - kvm_fd = cpu->kvm_fd;
> - g_free(cpu);
> - return kvm_fd;
> - }
> - }
> -
> - return kvm_vm_ioctl(s, KVM_CREATE_VCPU, (void *)vcpu_id);
> -}
> -
> int kvm_init_vcpu(CPUState *cpu, Error **errp)
> {
> KVMState *s = kvm_state;
> @@ -415,19 +451,14 @@ int kvm_init_vcpu(CPUState *cpu, Error **errp)
>
> trace_kvm_init_vcpu(cpu->cpu_index, kvm_arch_vcpu_id(cpu));
>
> - ret = kvm_get_vcpu(s, kvm_arch_vcpu_id(cpu));
> + ret = kvm_create_vcpu(cpu);
> if (ret < 0) {
> - error_setg_errno(errp, -ret, "kvm_init_vcpu: kvm_get_vcpu failed (%lu)",
> + error_setg_errno(errp, -ret,
> + "kvm_init_vcpu: kvm_create_vcpu failed (%lu)",
> kvm_arch_vcpu_id(cpu));
> goto err;
> }
>
> - cpu->kvm_fd = ret;
> - cpu->kvm_state = s;
> - cpu->vcpu_dirty = true;
> - cpu->dirty_pages = 0;
> - cpu->throttle_us_per_full = 0;
> -
> mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
> if (mmap_size < 0) {
> ret = mmap_size;
> diff --git a/accel/kvm/kvm-cpus.h b/accel/kvm/kvm-cpus.h
> index ca40add32c..171b22fd29 100644
> --- a/accel/kvm/kvm-cpus.h
> +++ b/accel/kvm/kvm-cpus.h
> @@ -22,5 +22,4 @@ bool kvm_supports_guest_debug(void);
> int kvm_insert_breakpoint(CPUState *cpu, int type, vaddr addr, vaddr len);
> int kvm_remove_breakpoint(CPUState *cpu, int type, vaddr addr, vaddr len);
> void kvm_remove_all_breakpoints(CPUState *cpu);
> -
> #endif /* KVM_CPUS_H */
> diff --git a/accel/kvm/trace-events b/accel/kvm/trace-events
> index 681ccb667d..37626c1ac5 100644
> --- a/accel/kvm/trace-events
> +++ b/accel/kvm/trace-events
> @@ -9,6 +9,10 @@ kvm_device_ioctl(int fd, int type, void *arg) "dev fd %d, type 0x%x, arg %p"
> kvm_failed_reg_get(uint64_t id, const char *msg) "Warning: Unable to retrieve ONEREG %" PRIu64 " from KVM: %s"
> kvm_failed_reg_set(uint64_t id, const char *msg) "Warning: Unable to set ONEREG %" PRIu64 " to KVM: %s"
> kvm_init_vcpu(int cpu_index, unsigned long arch_cpu_id) "index: %d id: %lu"
> +kvm_create_vcpu(int cpu_index, unsigned long arch_cpu_id, int kvm_fd) "index: %d, id: %lu, kvm fd: %d"
> +kvm_destroy_vcpu(int cpu_index, unsigned long arch_cpu_id) "index: %d id: %lu"
> +kvm_park_vcpu(int cpu_index, unsigned long arch_cpu_id) "index: %d id: %lu"
> +kvm_unpark_vcpu(unsigned long arch_cpu_id, const char *msg) "id: %lu %s"
> kvm_irqchip_commit_routes(void) ""
> kvm_irqchip_add_msi_route(char *name, int vector, int virq) "dev %s vector %d virq %d"
> kvm_irqchip_update_msi_route(int virq) "Updating MSI route virq=%d"
> @@ -25,7 +29,6 @@ kvm_dirty_ring_reaper(const char *s) "%s"
> kvm_dirty_ring_reap(uint64_t count, int64_t t) "reaped %"PRIu64" pages (took %"PRIi64" us)"
> kvm_dirty_ring_reaper_kick(const char *reason) "%s"
> kvm_dirty_ring_flush(int finished) "%d"
> -kvm_destroy_vcpu(void) ""
> kvm_failed_get_vcpu_mmap_size(void) ""
> kvm_cpu_exec(void) ""
> kvm_interrupt_exit_request(void) ""
> diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
> index c31d9c7356..c4a914b3d8 100644
> --- a/include/sysemu/kvm.h
> +++ b/include/sysemu/kvm.h
> @@ -313,6 +313,31 @@ int kvm_create_device(KVMState *s, uint64_t type, bool test);
> */
> bool kvm_device_supported(int vmfd, uint64_t type);
>
> +/**
> + * kvm_create_vcpu - Gets a parked KVM vCPU or creates a KVM vCPU
> + * @cpu: QOM CPUState object for which KVM vCPU has to be fetched/created.
> + *
> + * @returns: 0 when success, errno (<0) when failed.
> + */
> +int kvm_create_vcpu(CPUState *cpu);
> +
> +/**
> + * kvm_park_vcpu - Park QEMU KVM vCPU context
> + * @cpu: QOM CPUState object for which QEMU KVM vCPU context has to be parked.
> + *
> + * @returns: none
> + */
> +void kvm_park_vcpu(CPUState *cpu);
> +
> +/**
> + * kvm_unpark_vcpu - unpark QEMU KVM vCPU context
> + * @s: KVM State
> + * @vcpu_id: Architecture vCPU ID of the parked vCPU
> + *
> + * @returns: KVM fd
> + */
> +int kvm_unpark_vcpu(KVMState *s, unsigned long vcpu_id);
> +
> /* Arch specific hooks */
>
> extern const KVMCapabilityInfo kvm_arch_required_capabilities[];
On Mon, 15 Jul 2024 14:49:25 +0200
Igor Mammedov <imammedo@redhat.com> wrote:
> On Sat, 13 Jul 2024 19:25:10 +0100
> Salil Mehta <salil.mehta@huawei.com> wrote:
>
> > KVM vCPU creation is done once during the vCPU realization when Qemu vCPU thread
> > is spawned. This is common to all the architectures as of now.
> >
> > Hot-unplug of vCPU results in destruction of the vCPU object in QOM but the
> > corresponding KVM vCPU object in the Host KVM is not destroyed as KVM doesn't
> > support vCPU removal. Therefore, its representative KVM vCPU object/context in
> > Qemu is parked.
> >
> > Refactor architecture common logic so that some APIs could be reused by vCPU
> > Hotplug code of some architectures likes ARM, Loongson etc. Update new/old APIs
> > with trace events. New APIs qemu_{create,park,unpark}_vcpu() can be externally
> > called. No functional change is intended here.
> >
> > Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
> > Reviewed-by: Gavin Shan <gshan@redhat.com>
> > Tested-by: Vishnu Pajjuri <vishnu@os.amperecomputing.com>
> > Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> > Tested-by: Xianglai Li <lixianglai@loongson.cn>
> > Tested-by: Miguel Luis <miguel.luis@oracle.com>
> > Reviewed-by: Shaoqin Huang <shahuang@redhat.com>
> > Reviewed-by: Vishnu Pajjuri <vishnu@os.amperecomputing.com>
> > Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
> > Tested-by: Zhao Liu <zhao1.liu@intel.com>
> > Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
> > Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
>
> Reviewed-by: Igor Mammedov <imammedo@redhat.com>
this needs fixing, to make checkpatch happy
Checking 0001-accel-kvm-Extract-common-KVM-vCPU-creation-parking-c.patch...
WARNING: line over 80 characters
#120: FILE: accel/kvm/kvm-all.c:368:
+ trace_kvm_unpark_vcpu(vcpu_id, kvm_fd > 0 ? "unparked" : "not found parked");
total: 0 errors, 1 warnings, 183 lines checked
>
> > ---
> > accel/kvm/kvm-all.c | 95 ++++++++++++++++++++++++++++--------------
> > accel/kvm/kvm-cpus.h | 1 -
> > accel/kvm/trace-events | 5 ++-
> > include/sysemu/kvm.h | 25 +++++++++++
> > 4 files changed, 92 insertions(+), 34 deletions(-)
> >
> > diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
> > index 2b4ab89679..e446d18944 100644
> > --- a/accel/kvm/kvm-all.c
> > +++ b/accel/kvm/kvm-all.c
> > @@ -340,14 +340,71 @@ err:
> > return ret;
> > }
> >
> > +void kvm_park_vcpu(CPUState *cpu)
> > +{
> > + struct KVMParkedVcpu *vcpu;
> > +
> > + trace_kvm_park_vcpu(cpu->cpu_index, kvm_arch_vcpu_id(cpu));
> > +
> > + vcpu = g_malloc0(sizeof(*vcpu));
> > + vcpu->vcpu_id = kvm_arch_vcpu_id(cpu);
> > + vcpu->kvm_fd = cpu->kvm_fd;
> > + QLIST_INSERT_HEAD(&kvm_state->kvm_parked_vcpus, vcpu, node);
> > +}
> > +
> > +int kvm_unpark_vcpu(KVMState *s, unsigned long vcpu_id)
> > +{
> > + struct KVMParkedVcpu *cpu;
> > + int kvm_fd = -ENOENT;
> > +
> > + QLIST_FOREACH(cpu, &s->kvm_parked_vcpus, node) {
> > + if (cpu->vcpu_id == vcpu_id) {
> > + QLIST_REMOVE(cpu, node);
> > + kvm_fd = cpu->kvm_fd;
> > + g_free(cpu);
> > + }
> > + }
> > +
> > + trace_kvm_unpark_vcpu(vcpu_id, kvm_fd > 0 ? "unparked" : "not found parked");
> > +
> > + return kvm_fd;
> > +}
> > +
> > +int kvm_create_vcpu(CPUState *cpu)
> > +{
> > + unsigned long vcpu_id = kvm_arch_vcpu_id(cpu);
> > + KVMState *s = kvm_state;
> > + int kvm_fd;
> > +
> > + /* check if the KVM vCPU already exist but is parked */
> > + kvm_fd = kvm_unpark_vcpu(s, vcpu_id);
> > + if (kvm_fd < 0) {
> > + /* vCPU not parked: create a new KVM vCPU */
> > + kvm_fd = kvm_vm_ioctl(s, KVM_CREATE_VCPU, vcpu_id);
> > + if (kvm_fd < 0) {
> > + error_report("KVM_CREATE_VCPU IOCTL failed for vCPU %lu", vcpu_id);
> > + return kvm_fd;
> > + }
> > + }
> > +
> > + cpu->kvm_fd = kvm_fd;
> > + cpu->kvm_state = s;
> > + cpu->vcpu_dirty = true;
> > + cpu->dirty_pages = 0;
> > + cpu->throttle_us_per_full = 0;
> > +
> > + trace_kvm_create_vcpu(cpu->cpu_index, vcpu_id, kvm_fd);
> > +
> > + return 0;
> > +}
> > +
> > static int do_kvm_destroy_vcpu(CPUState *cpu)
> > {
> > KVMState *s = kvm_state;
> > long mmap_size;
> > - struct KVMParkedVcpu *vcpu = NULL;
> > int ret = 0;
> >
> > - trace_kvm_destroy_vcpu();
> > + trace_kvm_destroy_vcpu(cpu->cpu_index, kvm_arch_vcpu_id(cpu));
> >
> > ret = kvm_arch_destroy_vcpu(cpu);
> > if (ret < 0) {
> > @@ -373,10 +430,7 @@ static int do_kvm_destroy_vcpu(CPUState *cpu)
> > }
> > }
> >
> > - vcpu = g_malloc0(sizeof(*vcpu));
> > - vcpu->vcpu_id = kvm_arch_vcpu_id(cpu);
> > - vcpu->kvm_fd = cpu->kvm_fd;
> > - QLIST_INSERT_HEAD(&kvm_state->kvm_parked_vcpus, vcpu, node);
> > + kvm_park_vcpu(cpu);
> > err:
> > return ret;
> > }
> > @@ -389,24 +443,6 @@ void kvm_destroy_vcpu(CPUState *cpu)
> > }
> > }
> >
> > -static int kvm_get_vcpu(KVMState *s, unsigned long vcpu_id)
> > -{
> > - struct KVMParkedVcpu *cpu;
> > -
> > - QLIST_FOREACH(cpu, &s->kvm_parked_vcpus, node) {
> > - if (cpu->vcpu_id == vcpu_id) {
> > - int kvm_fd;
> > -
> > - QLIST_REMOVE(cpu, node);
> > - kvm_fd = cpu->kvm_fd;
> > - g_free(cpu);
> > - return kvm_fd;
> > - }
> > - }
> > -
> > - return kvm_vm_ioctl(s, KVM_CREATE_VCPU, (void *)vcpu_id);
> > -}
> > -
> > int kvm_init_vcpu(CPUState *cpu, Error **errp)
> > {
> > KVMState *s = kvm_state;
> > @@ -415,19 +451,14 @@ int kvm_init_vcpu(CPUState *cpu, Error **errp)
> >
> > trace_kvm_init_vcpu(cpu->cpu_index, kvm_arch_vcpu_id(cpu));
> >
> > - ret = kvm_get_vcpu(s, kvm_arch_vcpu_id(cpu));
> > + ret = kvm_create_vcpu(cpu);
> > if (ret < 0) {
> > - error_setg_errno(errp, -ret, "kvm_init_vcpu: kvm_get_vcpu failed (%lu)",
> > + error_setg_errno(errp, -ret,
> > + "kvm_init_vcpu: kvm_create_vcpu failed (%lu)",
> > kvm_arch_vcpu_id(cpu));
> > goto err;
> > }
> >
> > - cpu->kvm_fd = ret;
> > - cpu->kvm_state = s;
> > - cpu->vcpu_dirty = true;
> > - cpu->dirty_pages = 0;
> > - cpu->throttle_us_per_full = 0;
> > -
> > mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
> > if (mmap_size < 0) {
> > ret = mmap_size;
> > diff --git a/accel/kvm/kvm-cpus.h b/accel/kvm/kvm-cpus.h
> > index ca40add32c..171b22fd29 100644
> > --- a/accel/kvm/kvm-cpus.h
> > +++ b/accel/kvm/kvm-cpus.h
> > @@ -22,5 +22,4 @@ bool kvm_supports_guest_debug(void);
> > int kvm_insert_breakpoint(CPUState *cpu, int type, vaddr addr, vaddr len);
> > int kvm_remove_breakpoint(CPUState *cpu, int type, vaddr addr, vaddr len);
> > void kvm_remove_all_breakpoints(CPUState *cpu);
> > -
> > #endif /* KVM_CPUS_H */
> > diff --git a/accel/kvm/trace-events b/accel/kvm/trace-events
> > index 681ccb667d..37626c1ac5 100644
> > --- a/accel/kvm/trace-events
> > +++ b/accel/kvm/trace-events
> > @@ -9,6 +9,10 @@ kvm_device_ioctl(int fd, int type, void *arg) "dev fd %d, type 0x%x, arg %p"
> > kvm_failed_reg_get(uint64_t id, const char *msg) "Warning: Unable to retrieve ONEREG %" PRIu64 " from KVM: %s"
> > kvm_failed_reg_set(uint64_t id, const char *msg) "Warning: Unable to set ONEREG %" PRIu64 " to KVM: %s"
> > kvm_init_vcpu(int cpu_index, unsigned long arch_cpu_id) "index: %d id: %lu"
> > +kvm_create_vcpu(int cpu_index, unsigned long arch_cpu_id, int kvm_fd) "index: %d, id: %lu, kvm fd: %d"
> > +kvm_destroy_vcpu(int cpu_index, unsigned long arch_cpu_id) "index: %d id: %lu"
> > +kvm_park_vcpu(int cpu_index, unsigned long arch_cpu_id) "index: %d id: %lu"
> > +kvm_unpark_vcpu(unsigned long arch_cpu_id, const char *msg) "id: %lu %s"
> > kvm_irqchip_commit_routes(void) ""
> > kvm_irqchip_add_msi_route(char *name, int vector, int virq) "dev %s vector %d virq %d"
> > kvm_irqchip_update_msi_route(int virq) "Updating MSI route virq=%d"
> > @@ -25,7 +29,6 @@ kvm_dirty_ring_reaper(const char *s) "%s"
> > kvm_dirty_ring_reap(uint64_t count, int64_t t) "reaped %"PRIu64" pages (took %"PRIi64" us)"
> > kvm_dirty_ring_reaper_kick(const char *reason) "%s"
> > kvm_dirty_ring_flush(int finished) "%d"
> > -kvm_destroy_vcpu(void) ""
> > kvm_failed_get_vcpu_mmap_size(void) ""
> > kvm_cpu_exec(void) ""
> > kvm_interrupt_exit_request(void) ""
> > diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h
> > index c31d9c7356..c4a914b3d8 100644
> > --- a/include/sysemu/kvm.h
> > +++ b/include/sysemu/kvm.h
> > @@ -313,6 +313,31 @@ int kvm_create_device(KVMState *s, uint64_t type, bool test);
> > */
> > bool kvm_device_supported(int vmfd, uint64_t type);
> >
> > +/**
> > + * kvm_create_vcpu - Gets a parked KVM vCPU or creates a KVM vCPU
> > + * @cpu: QOM CPUState object for which KVM vCPU has to be fetched/created.
> > + *
> > + * @returns: 0 when success, errno (<0) when failed.
> > + */
> > +int kvm_create_vcpu(CPUState *cpu);
> > +
> > +/**
> > + * kvm_park_vcpu - Park QEMU KVM vCPU context
> > + * @cpu: QOM CPUState object for which QEMU KVM vCPU context has to be parked.
> > + *
> > + * @returns: none
> > + */
> > +void kvm_park_vcpu(CPUState *cpu);
> > +
> > +/**
> > + * kvm_unpark_vcpu - unpark QEMU KVM vCPU context
> > + * @s: KVM State
> > + * @vcpu_id: Architecture vCPU ID of the parked vCPU
> > + *
> > + * @returns: KVM fd
> > + */
> > +int kvm_unpark_vcpu(KVMState *s, unsigned long vcpu_id);
> > +
> > /* Arch specific hooks */
> >
> > extern const KVMCapabilityInfo kvm_arch_required_capabilities[];
>
> From: Igor Mammedov <imammedo@redhat.com>
> Sent: Monday, July 15, 2024 2:28 PM
> To: Salil Mehta <salil.mehta@huawei.com>
>
> On Mon, 15 Jul 2024 14:49:25 +0200
> Igor Mammedov <imammedo@redhat.com> wrote:
>
> > On Sat, 13 Jul 2024 19:25:10 +0100
> > Salil Mehta <salil.mehta@huawei.com> wrote:
> >
> > > KVM vCPU creation is done once during the vCPU realization when Qemu
> > > vCPU thread is spawned. This is common to all the architectures as of now.
> > >
> > > Hot-unplug of vCPU results in destruction of the vCPU object in QOM
> > > but the corresponding KVM vCPU object in the Host KVM is not
> > > destroyed as KVM doesn't support vCPU removal. Therefore, its
> > > representative KVM vCPU object/context in Qemu is parked.
> > >
> > > Refactor architecture common logic so that some APIs could be reused
> > > by vCPU Hotplug code of some architectures likes ARM, Loongson etc.
> > > Update new/old APIs with trace events. New APIs
> > > qemu_{create,park,unpark}_vcpu() can be externally called. No
> functional change is intended here.
> > >
> > > Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
> > > Reviewed-by: Gavin Shan <gshan@redhat.com>
> > > Tested-by: Vishnu Pajjuri <vishnu@os.amperecomputing.com>
> > > Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> > > Tested-by: Xianglai Li <lixianglai@loongson.cn>
> > > Tested-by: Miguel Luis <miguel.luis@oracle.com>
> > > Reviewed-by: Shaoqin Huang <shahuang@redhat.com>
> > > Reviewed-by: Vishnu Pajjuri <vishnu@os.amperecomputing.com>
> > > Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
> > > Tested-by: Zhao Liu <zhao1.liu@intel.com>
> > > Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
> > > Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
> >
> > Reviewed-by: Igor Mammedov <imammedo@redhat.com>
>
> this needs fixing, to make checkpatch happy
>
> Checking 0001-accel-kvm-Extract-common-KVM-vCPU-creation-parking-
> c.patch...
> WARNING: line over 80 characters
> #120: FILE: accel/kvm/kvm-all.c:368:
> + trace_kvm_unpark_vcpu(vcpu_id, kvm_fd > 0 ? "unparked" : "not found
> + parked");
Thanks. I will fix this as well.
>
> total: 0 errors, 1 warnings, 183 lines checked
>
> >
> > > ---
> > > accel/kvm/kvm-all.c | 95 ++++++++++++++++++++++++++++----------
> ----
> > > accel/kvm/kvm-cpus.h | 1 -
> > > accel/kvm/trace-events | 5 ++-
> > > include/sysemu/kvm.h | 25 +++++++++++
> > > 4 files changed, 92 insertions(+), 34 deletions(-)
> > >
> > > diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c index
> > > 2b4ab89679..e446d18944 100644
> > > --- a/accel/kvm/kvm-all.c
> > > +++ b/accel/kvm/kvm-all.c
> > > @@ -340,14 +340,71 @@ err:
> > > return ret;
> > > }
> > >
> > > +void kvm_park_vcpu(CPUState *cpu)
> > > +{
> > > + struct KVMParkedVcpu *vcpu;
> > > +
> > > + trace_kvm_park_vcpu(cpu->cpu_index, kvm_arch_vcpu_id(cpu));
> > > +
> > > + vcpu = g_malloc0(sizeof(*vcpu));
> > > + vcpu->vcpu_id = kvm_arch_vcpu_id(cpu);
> > > + vcpu->kvm_fd = cpu->kvm_fd;
> > > + QLIST_INSERT_HEAD(&kvm_state->kvm_parked_vcpus, vcpu,
> node); }
> > > +
> > > +int kvm_unpark_vcpu(KVMState *s, unsigned long vcpu_id) {
> > > + struct KVMParkedVcpu *cpu;
> > > + int kvm_fd = -ENOENT;
> > > +
> > > + QLIST_FOREACH(cpu, &s->kvm_parked_vcpus, node) {
> > > + if (cpu->vcpu_id == vcpu_id) {
> > > + QLIST_REMOVE(cpu, node);
> > > + kvm_fd = cpu->kvm_fd;
> > > + g_free(cpu);
> > > + }
> > > + }
> > > +
> > > + trace_kvm_unpark_vcpu(vcpu_id, kvm_fd > 0 ? "unparked" : "not
> > > + found parked");
> > > +
> > > + return kvm_fd;
> > > +}
> > > +
> > > +int kvm_create_vcpu(CPUState *cpu)
> > > +{
> > > + unsigned long vcpu_id = kvm_arch_vcpu_id(cpu);
> > > + KVMState *s = kvm_state;
> > > + int kvm_fd;
> > > +
> > > + /* check if the KVM vCPU already exist but is parked */
> > > + kvm_fd = kvm_unpark_vcpu(s, vcpu_id);
> > > + if (kvm_fd < 0) {
> > > + /* vCPU not parked: create a new KVM vCPU */
> > > + kvm_fd = kvm_vm_ioctl(s, KVM_CREATE_VCPU, vcpu_id);
> > > + if (kvm_fd < 0) {
> > > + error_report("KVM_CREATE_VCPU IOCTL failed for vCPU %lu",
> vcpu_id);
> > > + return kvm_fd;
> > > + }
> > > + }
> > > +
> > > + cpu->kvm_fd = kvm_fd;
> > > + cpu->kvm_state = s;
> > > + cpu->vcpu_dirty = true;
> > > + cpu->dirty_pages = 0;
> > > + cpu->throttle_us_per_full = 0;
> > > +
> > > + trace_kvm_create_vcpu(cpu->cpu_index, vcpu_id, kvm_fd);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > static int do_kvm_destroy_vcpu(CPUState *cpu) {
> > > KVMState *s = kvm_state;
> > > long mmap_size;
> > > - struct KVMParkedVcpu *vcpu = NULL;
> > > int ret = 0;
> > >
> > > - trace_kvm_destroy_vcpu();
> > > + trace_kvm_destroy_vcpu(cpu->cpu_index,
> kvm_arch_vcpu_id(cpu));
> > >
> > > ret = kvm_arch_destroy_vcpu(cpu);
> > > if (ret < 0) {
> > > @@ -373,10 +430,7 @@ static int do_kvm_destroy_vcpu(CPUState
> *cpu)
> > > }
> > > }
> > >
> > > - vcpu = g_malloc0(sizeof(*vcpu));
> > > - vcpu->vcpu_id = kvm_arch_vcpu_id(cpu);
> > > - vcpu->kvm_fd = cpu->kvm_fd;
> > > - QLIST_INSERT_HEAD(&kvm_state->kvm_parked_vcpus, vcpu, node);
> > > + kvm_park_vcpu(cpu);
> > > err:
> > > return ret;
> > > }
> > > @@ -389,24 +443,6 @@ void kvm_destroy_vcpu(CPUState *cpu)
> > > }
> > > }
> > >
> > > -static int kvm_get_vcpu(KVMState *s, unsigned long vcpu_id) -{
> > > - struct KVMParkedVcpu *cpu;
> > > -
> > > - QLIST_FOREACH(cpu, &s->kvm_parked_vcpus, node) {
> > > - if (cpu->vcpu_id == vcpu_id) {
> > > - int kvm_fd;
> > > -
> > > - QLIST_REMOVE(cpu, node);
> > > - kvm_fd = cpu->kvm_fd;
> > > - g_free(cpu);
> > > - return kvm_fd;
> > > - }
> > > - }
> > > -
> > > - return kvm_vm_ioctl(s, KVM_CREATE_VCPU, (void *)vcpu_id);
> > > -}
> > > -
> > > int kvm_init_vcpu(CPUState *cpu, Error **errp) {
> > > KVMState *s = kvm_state;
> > > @@ -415,19 +451,14 @@ int kvm_init_vcpu(CPUState *cpu, Error
> **errp)
> > >
> > > trace_kvm_init_vcpu(cpu->cpu_index, kvm_arch_vcpu_id(cpu));
> > >
> > > - ret = kvm_get_vcpu(s, kvm_arch_vcpu_id(cpu));
> > > + ret = kvm_create_vcpu(cpu);
> > > if (ret < 0) {
> > > - error_setg_errno(errp, -ret, "kvm_init_vcpu: kvm_get_vcpu failed
> (%lu)",
> > > + error_setg_errno(errp, -ret,
> > > + "kvm_init_vcpu: kvm_create_vcpu failed
> > > + (%lu)",
> > > kvm_arch_vcpu_id(cpu));
> > > goto err;
> > > }
> > >
> > > - cpu->kvm_fd = ret;
> > > - cpu->kvm_state = s;
> > > - cpu->vcpu_dirty = true;
> > > - cpu->dirty_pages = 0;
> > > - cpu->throttle_us_per_full = 0;
> > > -
> > > mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
> > > if (mmap_size < 0) {
> > > ret = mmap_size;
> > > diff --git a/accel/kvm/kvm-cpus.h b/accel/kvm/kvm-cpus.h index
> > > ca40add32c..171b22fd29 100644
> > > --- a/accel/kvm/kvm-cpus.h
> > > +++ b/accel/kvm/kvm-cpus.h
> > > @@ -22,5 +22,4 @@ bool kvm_supports_guest_debug(void); int
> > > kvm_insert_breakpoint(CPUState *cpu, int type, vaddr addr, vaddr
> > > len); int kvm_remove_breakpoint(CPUState *cpu, int type, vaddr
> > > addr, vaddr len); void kvm_remove_all_breakpoints(CPUState *cpu);
> > > -
> > > #endif /* KVM_CPUS_H */
> > > diff --git a/accel/kvm/trace-events b/accel/kvm/trace-events index
> > > 681ccb667d..37626c1ac5 100644
> > > --- a/accel/kvm/trace-events
> > > +++ b/accel/kvm/trace-events
> > > @@ -9,6 +9,10 @@ kvm_device_ioctl(int fd, int type, void *arg) "dev fd
> %d, type 0x%x, arg %p"
> > > kvm_failed_reg_get(uint64_t id, const char *msg) "Warning: Unable to
> retrieve ONEREG %" PRIu64 " from KVM: %s"
> > > kvm_failed_reg_set(uint64_t id, const char *msg) "Warning: Unable to
> set ONEREG %" PRIu64 " to KVM: %s"
> > > kvm_init_vcpu(int cpu_index, unsigned long arch_cpu_id) "index: %d
> id: %lu"
> > > +kvm_create_vcpu(int cpu_index, unsigned long arch_cpu_id, int
> kvm_fd) "index: %d, id: %lu, kvm fd: %d"
> > > +kvm_destroy_vcpu(int cpu_index, unsigned long arch_cpu_id) "index:
> %d id: %lu"
> > > +kvm_park_vcpu(int cpu_index, unsigned long arch_cpu_id) "index: %d
> id: %lu"
> > > +kvm_unpark_vcpu(unsigned long arch_cpu_id, const char *msg) "id:
> %lu %s"
> > > kvm_irqchip_commit_routes(void) ""
> > > kvm_irqchip_add_msi_route(char *name, int vector, int virq) "dev %s
> vector %d virq %d"
> > > kvm_irqchip_update_msi_route(int virq) "Updating MSI route virq=%d"
> > > @@ -25,7 +29,6 @@ kvm_dirty_ring_reaper(const char *s) "%s"
> > > kvm_dirty_ring_reap(uint64_t count, int64_t t) "reaped %"PRIu64"
> pages (took %"PRIi64" us)"
> > > kvm_dirty_ring_reaper_kick(const char *reason) "%s"
> > > kvm_dirty_ring_flush(int finished) "%d"
> > > -kvm_destroy_vcpu(void) ""
> > > kvm_failed_get_vcpu_mmap_size(void) ""
> > > kvm_cpu_exec(void) ""
> > > kvm_interrupt_exit_request(void) ""
> > > diff --git a/include/sysemu/kvm.h b/include/sysemu/kvm.h index
> > > c31d9c7356..c4a914b3d8 100644
> > > --- a/include/sysemu/kvm.h
> > > +++ b/include/sysemu/kvm.h
> > > @@ -313,6 +313,31 @@ int kvm_create_device(KVMState *s, uint64_t
> type, bool test);
> > > */
> > > bool kvm_device_supported(int vmfd, uint64_t type);
> > >
> > > +/**
> > > + * kvm_create_vcpu - Gets a parked KVM vCPU or creates a KVM vCPU
> > > + * @cpu: QOM CPUState object for which KVM vCPU has to be
> fetched/created.
> > > + *
> > > + * @returns: 0 when success, errno (<0) when failed.
> > > + */
> > > +int kvm_create_vcpu(CPUState *cpu);
> > > +
> > > +/**
> > > + * kvm_park_vcpu - Park QEMU KVM vCPU context
> > > + * @cpu: QOM CPUState object for which QEMU KVM vCPU context
> has to be parked.
> > > + *
> > > + * @returns: none
> > > + */
> > > +void kvm_park_vcpu(CPUState *cpu);
> > > +
> > > +/**
> > > + * kvm_unpark_vcpu - unpark QEMU KVM vCPU context
> > > + * @s: KVM State
> > > + * @vcpu_id: Architecture vCPU ID of the parked vCPU
> > > + *
> > > + * @returns: KVM fd
> > > + */
> > > +int kvm_unpark_vcpu(KVMState *s, unsigned long vcpu_id);
> > > +
> > > /* Arch specific hooks */
> > >
> > > extern const KVMCapabilityInfo kvm_arch_required_capabilities[];
> >
>
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