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KVM: x86: hyperv: declare KVM_CAP_HYPERV_TLBFLUSH capability

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We need a new capability to indicate support for the newly added
HvFlushVirtualAddress{List,Space}{,Ex} hypercalls. Upon seeing this
capability, userspace is supposed to announce PV TLB flush features
by setting the appropriate CPUID bits (if needed).

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Vitaly Kuznetsov
2018-05-16 17:21:31 +02:00
committed by Radim Krčmář
parent c70126764b
commit c1aea9196e
3 changed files with 11 additions and 0 deletions
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9
Documentation/virtual/kvm/api.txt
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@@ -4603,3 +4603,12 @@ Architectures: s390
This capability indicates that kvm will implement the interfaces to handle
reset, migration and nested KVM for branch prediction blocking. The stfle
facility 82 should not be provided to the guest without this capability.
8.14 KVM_CAP_HYPERV_TLBFLUSH
Architectures: x86
This capability indicates that KVM supports paravirtualized Hyper-V TLB Flush
hypercalls:
HvFlushVirtualAddressSpace, HvFlushVirtualAddressSpaceEx,
HvFlushVirtualAddressList, HvFlushVirtualAddressListEx.