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KVM: x86: hyper-v: Check access to hypercall before reading XMM registers

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In case guest doesn't have access to the particular hypercall we can avoid
reading XMM registers.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Siddharth Chandrasekaran <sidcha@amazon.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210730122625.112848-2-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2021-07-30 14:26:22 +02:00 committed by Paolo Bonzini
parent fa7a549d32
commit 2e2f1e8d04
1 changed files with 3 additions and 3 deletions
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6
arch/x86/kvm/hyperv.c
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@ -2173,9 +2173,6 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
hc.rep_idx = (hc.param >> HV_HYPERCALL_REP_START_OFFSET) & 0xfff;
hc.rep = !!(hc.rep_cnt || hc.rep_idx);
if (hc.fast && is_xmm_fast_hypercall(&hc))
kvm_hv_hypercall_read_xmm(&hc);
trace_kvm_hv_hypercall(hc.code, hc.fast, hc.rep_cnt, hc.rep_idx,
hc.ingpa, hc.outgpa);
@ -2184,6 +2181,9 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
goto hypercall_complete;
}
if (hc.fast && is_xmm_fast_hypercall(&hc))
kvm_hv_hypercall_read_xmm(&hc);
switch (hc.code) {
case HVCALL_NOTIFY_LONG_SPIN_WAIT:
if (unlikely(hc.rep)) {