renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-16 17:23:55 +08:00
Code

KVM: x86: hyper-v: Check if guest is allowed to use XMM registers for hypercall input

Browse Source 
TLFS states that "Availability of the XMM fast hypercall interface is
indicated via the “Hypervisor Feature Identification” CPUID Leaf
(0x40000003, see section 2.4.4) ... Any attempt to use this interface
when the hypervisor does not indicate availability will result in a #UD
fault."

Implement the check for 'strict' mode (KVM_CAP_HYPERV_ENFORCE_CPUID).

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: <20210730122625.112848-4-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2021-07-30 14:26:24 +02:00 committed by Paolo Bonzini
parent f5714bbb5b
commit 4e62aa96d6
1 changed files with 11 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
arch/x86/kvm/hyperv.c
View File

@ -2140,6 +2140,7 @@ static bool hv_check_hypercall_access(struct kvm_vcpu_hv *hv_vcpu, u16 code)
int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
{
struct kvm_vcpu_hv *hv_vcpu = to_hv_vcpu(vcpu);
struct kvm_hv_hcall hc;
u64 ret = HV_STATUS_SUCCESS;
@ -2177,13 +2178,21 @@ 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))) {
if (unlikely(!hv_check_hypercall_access(hv_vcpu, hc.code))) {
ret = HV_STATUS_ACCESS_DENIED;
goto hypercall_complete;
}
if (hc.fast && is_xmm_fast_hypercall(&hc))
if (hc.fast && is_xmm_fast_hypercall(&hc)) {
if (unlikely(hv_vcpu->enforce_cpuid &&
!(hv_vcpu->cpuid_cache.features_edx &
HV_X64_HYPERCALL_XMM_INPUT_AVAILABLE))) {
kvm_queue_exception(vcpu, UD_VECTOR);
return 1;
}
kvm_hv_hypercall_read_xmm(&hc);
}
switch (hc.code) {
case HVCALL_NOTIFY_LONG_SPIN_WAIT: