If the "nested" module option is enabled, add the "VMX" CPU feature to the
list of CPU features KVM advertises with the KVM_GET_SUPPORTED_CPUID ioctl.
Qemu uses this ioctl, and intersects KVM's list with its own list of desired
cpu features (depending on the -cpu option given to qemu) to determine the
final list of features presented to the guest.
Signed-off-by: Nadav Har'El <nyh@xxxxxxxxxx>
---
arch/x86/kvm/vmx.c | 2 ++
1 file changed, 2 insertions(+)
--- .before/arch/x86/kvm/vmx.c 2010-10-17 11:52:00.000000000 +0200
+++ .after/arch/x86/kvm/vmx.c 2010-10-17 11:52:00.000000000 +0200
@@ -4271,6 +4271,8 @@ static void vmx_cpuid_update(struct kvm_
static void vmx_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
{
+ if (func == 1 && nested)
+ entry->ecx |= bit(X86_FEATURE_VMX);
}
static struct kvm_x86_ops vmx_x86_ops = {
--
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