From: Aili Yao <yaoaili@kingsoft.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>
Cc: <yaoaili126@gmail.com>, <x86@kernel.org>,
"H. Peter Anvin" <hpa@zytor.com>, <kvm@vger.kernel.org>,
<linux-kernel@vger.kernel.org>
Subject: KVM: x86: expose HINTS_REALTIME ablility to qemu
Date: Fri, 13 Aug 2021 17:54:20 +0800 [thread overview]
Message-ID: <20210813175420.62ab2ac2@alex-virtual-machine> (raw)
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
next reply other threads:[~2021-08-13 10:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-13 9:54 Aili Yao [this message]
2021-08-16 6:10 ` KVM: x86: expose HINTS_REALTIME ablility to qemu Aili Yao
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