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Commit c1aea919 authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Radim Krčmář
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KVM: x86: hyperv: declare KVM_CAP_HYPERV_TLBFLUSH capability 



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: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
parent c7012676

Documentation/virtual/kvm/api.txt

+9 −0
Original line number Diff line number Diff line
@@ -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.

arch/x86/kvm/x86.c

+1 −0
Original line number Diff line number Diff line
@@ -2871,6 +2871,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) 
	case KVM_CAP_HYPERV_SYNIC2:

	case KVM_CAP_HYPERV_VP_INDEX:

	case KVM_CAP_HYPERV_EVENTFD:

	case KVM_CAP_HYPERV_TLBFLUSH:

	case KVM_CAP_PCI_SEGMENT:

	case KVM_CAP_DEBUGREGS:

	case KVM_CAP_X86_ROBUST_SINGLESTEP:

include/uapi/linux/kvm.h

+1 −0
Original line number Diff line number Diff line
@@ -948,6 +948,7 @@ struct kvm_ppc_resize_hpt { 
#define KVM_CAP_S390_BPB 152

#define KVM_CAP_GET_MSR_FEATURES 153

#define KVM_CAP_HYPERV_EVENTFD 154

#define KVM_CAP_HYPERV_TLBFLUSH 155



#ifdef KVM_CAP_IRQ_ROUTING