diff options
| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2021-07-30 15:26:22 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-08-03 13:16:40 +0300 |
| commit | 2e2f1e8d0450c561c0c936b4b67e8b5a95975fb7 (patch) | |
| tree | 73dc45ea0c70fae07154f91c909ccc1598e75d0a /arch/x86 | |
| parent | fa7a549d321a4189677b0cea86e58d9db7977f7b (diff) | |
| download | linux-2e2f1e8d0450c561c0c936b4b67e8b5a95975fb7.tar.xz | |
KVM: x86: hyper-v: Check access to hypercall before reading XMM registers
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>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/hyperv.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index b07592ca92f0..cb7e045905a5 100644 --- a/arch/x86/kvm/hyperv.c +++ b/arch/x86/kvm/hyperv.c @@ -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)) { |