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KVM: x86: hyper-v: Prepare to check access to Hyper-V hypercalls

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Introduce hv_check_hypercallr_access() to check if the particular hypercall
should be available to guest, this will be used with
KVM_CAP_HYPERV_ENFORCE_CPUID mode.

No functional change intended.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210521095204.2161214-21-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2021-05-21 11:51:54 +02:00 committed by Paolo Bonzini
parent 1aa8a4184d
commit 4ad81a9111
1 changed files with 11 additions and 0 deletions
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11
arch/x86/kvm/hyperv.c
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@ -2090,6 +2090,11 @@ static void kvm_hv_hypercall_read_xmm(struct kvm_hv_hcall *hc)
kvm_fpu_put();
}
static bool hv_check_hypercall_access(struct kvm_vcpu_hv *hv_vcpu, u16 code)
{
return true;
}
int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
{
struct kvm_hv_hcall hc;
@ -2132,6 +2137,11 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
trace_kvm_hv_hypercall(hc.code, hc.fast, hc.rep_cnt, hc.rep_idx,
hc.ingpa, hc.outgpa);
if (unlikely(!hv_check_hypercall_access(to_hv_vcpu(vcpu), hc.code))) {
ret = HV_STATUS_ACCESS_DENIED;
goto hypercall_complete;
}
switch (hc.code) {
case HVCALL_NOTIFY_LONG_SPIN_WAIT:
if (unlikely(hc.rep)) {
@ -2238,6 +2248,7 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
break;
}
hypercall_complete:
return kvm_hv_hypercall_complete(vcpu, ret);
}