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target/i386: disable VMX features if nested=0

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If kvm does not support VMX feature by nested=0, the kvm_vmx_basic
can't get the right value from MSR_IA32_VMX_BASIC register, which
make qemu coredump when qemu do KVM_SET_MSRS.

The coredump info:
error: failed to set MSR 0x480 to 0x0
kvm_put_msrs: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed.

Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Message-Id: <20191206071111.12128-1-yang.zhong@intel.com>
Reported-by: Catherine Ho <catherine.hecx@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Yang Zhong 2019-12-06 15:11:11 +08:00 committed by Paolo Bonzini
parent 1bdc319ab5
commit 2605188240
1 changed files with 8 additions and 0 deletions
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8
target/i386/kvm.c
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@ -2572,6 +2572,14 @@ static void kvm_msr_entry_add_vmx(X86CPU *cpu, FeatureWordArray f)
uint64_t kvm_vmx_basic =
kvm_arch_get_supported_msr_feature(kvm_state,
MSR_IA32_VMX_BASIC);
if (!kvm_vmx_basic) {
/* If the kernel doesn't support VMX feature (kvm_intel.nested=0),
* then kvm_vmx_basic will be 0 and KVM_SET_MSR will fail.
*/
return;
}
uint64_t kvm_vmx_misc =
kvm_arch_get_supported_msr_feature(kvm_state,
MSR_IA32_VMX_MISC);