diff options
| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2022-05-25 13:59:45 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-05-25 21:26:35 +0200 |
| commit | 869840d26c929b99694e31b1a18e83bdea6e97ca (patch) | |
| tree | 8d3be5755ce10f0b75bce56d99aa09de39dd6ca1 /target/i386/kvm | |
| parent | 7110fe56c1f69b9e1bdf838558fdcb75d1568964 (diff) | |
i386: Hyper-V Enlightened MSR bitmap feature
The newly introduced enlightenment allow L0 (KVM) and L1 (Hyper-V)
hypervisors to collaborate to avoid unnecessary updates to L2
MSR-Bitmap upon vmexits.
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20220525115949.1294004-3-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'target/i386/kvm')
| -rw-r--r-- | target/i386/kvm/hyperv-proto.h | 5 | ||||
| -rw-r--r-- | target/i386/kvm/kvm.c | 7 |
2 files changed, 12 insertions, 0 deletions
diff --git a/target/i386/kvm/hyperv-proto.h b/target/i386/kvm/hyperv-proto.h index e40e59411c..cea18dbc0e 100644 --- a/target/i386/kvm/hyperv-proto.h +++ b/target/i386/kvm/hyperv-proto.h @@ -87,6 +87,11 @@ #define HV_SYNDBG_CAP_ALLOW_KERNEL_DEBUGGING (1u << 1) /* + * HV_CPUID_NESTED_FEATURES.EAX bits + */ +#define HV_NESTED_MSR_BITMAP (1u << 19) + +/* * Basic virtualized MSRs */ #define HV_X64_MSR_GUEST_OS_ID 0x40000000 diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index 38af0e4f04..f389bbedf2 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -973,6 +973,13 @@ static struct { .dependencies = BIT(HYPERV_FEAT_SYNIC) | BIT(HYPERV_FEAT_RELAXED) }, #endif + [HYPERV_FEAT_MSR_BITMAP] = { + .desc = "enlightened MSR-Bitmap (hv-emsr-bitmap)", + .flags = { + {.func = HV_CPUID_NESTED_FEATURES, .reg = R_EAX, + .bits = HV_NESTED_MSR_BITMAP} + } + }, }; static struct kvm_cpuid2 *try_get_hv_cpuid(CPUState *cs, int max, |