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kvm/x86: Hyper-V kvm exit

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A new vcpu exit is introduced to notify the userspace of the
changes in Hyper-V SynIC configuration triggered by guest writing to the
corresponding MSRs.

Changes v4:
* exit into userspace only if guest writes into SynIC MSR's

Changes v3:
* added KVM_EXIT_HYPERV types and structs notes into docs

Signed-off-by: Andrey Smetanin <asmetanin@virtuozzo.com>
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Gleb Natapov <gleb@kernel.org>
CC: Paolo Bonzini <pbonzini@redhat.com>
CC: Roman Kagan <rkagan@virtuozzo.com>
CC: Denis V. Lunev <den@openvz.org>
CC: qemu-devel@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Andrey Smetanin
2015-11-10 15:36:35 +03:00
committed by Paolo Bonzini
parent 5c919412fe
commit db3975717a
6 changed files with 67 additions and 0 deletions
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17
include/uapi/linux/kvm.h
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@@ -154,6 +154,20 @@ struct kvm_s390_skeys {
__u32 flags;
__u32 reserved[9];
};
struct kvm_hyperv_exit {
#define KVM_EXIT_HYPERV_SYNIC 1
__u32 type;
union {
struct {
__u32 msr;
__u64 control;
__u64 evt_page;
__u64 msg_page;
} synic;
} u;
};
#define KVM_S390_GET_SKEYS_NONE 1
#define KVM_S390_SKEYS_MAX 1048576
@@ -184,6 +198,7 @@ struct kvm_s390_skeys {
#define KVM_EXIT_SYSTEM_EVENT 24
#define KVM_EXIT_S390_STSI 25
#define KVM_EXIT_IOAPIC_EOI 26
#define KVM_EXIT_HYPERV 27
/* For KVM_EXIT_INTERNAL_ERROR */
/* Emulate instruction failed. */
@@ -338,6 +353,8 @@ struct kvm_run {
struct {
__u8 vector;
} eoi;
/* KVM_EXIT_HYPERV */
struct kvm_hyperv_exit hyperv;
/* Fix the size of the union. */
char padding[256];
};