| Date | Wed, 8 Nov 2023 13:14:39 +0100 | Subject | Re: [RFC 11/33] KVM: x86: hyper-v: Handle GET/SET_VP_REGISTER hcall in user-space | From | Alexander Graf <> |
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On 08.11.23 12:17, Nicolas Saenz Julienne wrote: > Let user-space handle HVCALL_GET_VP_REGISTERS and > HVCALL_SET_VP_REGISTERS through the KVM_EXIT_HYPERV_HVCALL exit reason. > Additionally, expose the cpuid bit. > > Signed-off-by: Nicolas Saenz Julienne <nsaenz@amazon.com> > --- > arch/x86/kvm/hyperv.c | 9 +++++++++ > include/asm-generic/hyperv-tlfs.h | 1 + > 2 files changed, 10 insertions(+) > > diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c > index caaa859932c5..a3970d52eef1 100644 > --- a/arch/x86/kvm/hyperv.c > +++ b/arch/x86/kvm/hyperv.c > @@ -2456,6 +2456,9 @@ static void kvm_hv_write_xmm(struct kvm_hyperv_xmm_reg *xmm) > > static bool kvm_hv_is_xmm_output_hcall(u16 code) > { > + if (code == HVCALL_GET_VP_REGISTERS) > + return true; > + > return false; > } > > @@ -2520,6 +2523,8 @@ static bool is_xmm_fast_hypercall(struct kvm_hv_hcall *hc) > case HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST_EX: > case HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE_EX: > case HVCALL_SEND_IPI_EX: > + case HVCALL_GET_VP_REGISTERS: > + case HVCALL_SET_VP_REGISTERS: > return true; > } > > @@ -2738,6 +2743,9 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu) > break; > } > goto hypercall_userspace_exit; > + case HVCALL_GET_VP_REGISTERS: > + case HVCALL_SET_VP_REGISTERS: > + goto hypercall_userspace_exit; > default: > ret = HV_STATUS_INVALID_HYPERCALL_CODE; > break; > @@ -2903,6 +2911,7 @@ int kvm_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid, > ent->ebx |= HV_POST_MESSAGES; > ent->ebx |= HV_SIGNAL_EVENTS; > ent->ebx |= HV_ENABLE_EXTENDED_HYPERCALLS; > + ent->ebx |= HV_ACCESS_VP_REGISTERS;
Do we need to guard this?
Alex
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