KVM: x86: expose HINTS_REALTIME ablility to qemu

Aili Yao
2021-08-13T10:09:35Z

When I do a test that try to enable hint-dedicated for one VM, but qemu
says "warning: host doesn't support requested feature:
CPUID.40000001H:EDX.kvm-hint-dedicated [bit 0]".

It seems the kernel hasn't expose this ability even when supporting it;
So expose it.

Signed-off-by: Aili Yao <yaoaili@kingsoft.com>
---
arch/x86/kvm/cpuid.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 739be5da3bca..2153014742d7 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -917,7 +917,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)

entry->ebx = 0;
entry->ecx = 0;
- entry->edx = 0;
+ entry->edx = (1 << KVM_HINTS_REALTIME);
break;
case 0x80000000:
entry->eax = min(entry->eax, 0x8000001f);
--
2.25.1