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| author |   Wanpeng Li <wanpeng.li@hotmail.com> | 2017-07-13 18:30:42 -0700 |
|---|---|---|
| committer |   Radim Krčmář <rkrcmar@redhat.com> | 2017-07-14 14:26:16 +0200 |
| commit | 52a5c155cf79f1f059bffebf4d06d0249573e659 (patch) | |
| tree | 292b7e858eef7f1f2fd5d664a2f96c3974987582 /arch/x86/include/uapi | |
| parent | KVM: async_pf: Force a nested vmexit if the injected #PF is async_pf (diff) | |
| download | linux-dev-52a5c155cf79f1f059bffebf4d06d0249573e659.tar.xz linux-dev-52a5c155cf79f1f059bffebf4d06d0249573e659.zip | |
KVM: async_pf: Let guest support delivery of async_pf from guest mode
Adds another flag bit (bit 2) to MSR_KVM_ASYNC_PF_EN. If bit 2 is 1,
async page faults are delivered to L1 as #PF vmexits; if bit 2 is 0,
kvm_can_do_async_pf returns 0 if in guest mode.
This is similar to what svm.c wanted to do all along, but it is only
enabled for Linux as L1 hypervisor. Foreign hypervisors must never
receive async page faults as vmexits, because they'd probably be very
confused about that.
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Diffstat (limited to 'arch/x86/include/uapi')
| -rw-r--r-- | arch/x86/include/uapi/asm/kvm_para.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/include/uapi/asm/kvm_para.h b/arch/x86/include/uapi/asm/kvm_para.h index cff0bb6556f8..a965e5b0d328 100644 --- a/arch/x86/include/uapi/asm/kvm_para.h +++ b/arch/x86/include/uapi/asm/kvm_para.h @@ -67,6 +67,7 @@ struct kvm_clock_pairing { #define KVM_ASYNC_PF_ENABLED (1 << 0) #define KVM_ASYNC_PF_SEND_ALWAYS (1 << 1) +#define KVM_ASYNC_PF_DELIVERY_AS_PF_VMEXIT (1 << 2) /* Operations for KVM_HC_MMU_OP */ #define KVM_MMU_OP_WRITE_PTE 1 |