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From: Paolo Bonzini <pbonzini@redhat.com>
To: Xiaoyao Li <xiaoyao.li@intel.com>,
	Wanpeng Li <kernellwp@gmail.com>,
	linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Sean Christopherson <sean.j.christopherson@intel.com>,
	Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>
Subject: Re: [PATCH] KVM: X86: Expose KVM_HINTS_REALTIME in KVM_GET_SUPPORTED_CPUID
Date: Thu, 22 Oct 2020 16:06:43 +0200	[thread overview]
Message-ID: <31b189e0-503f-157d-7af0-329744ed5369@redhat.com> (raw)
In-Reply-To: <6ad94df6-9ecd-e364-296a-34ba41e938b1@intel.com>

On 22/10/20 15:31, Xiaoyao Li wrote:
>>
>> It's common for userspace to copy all supported CPUID bits to
>> KVM_SET_CPUID2, I don't think this is the right behavior for
>> KVM_HINTS_REALTIME.
> 
> It reminds of X86_FEATURE_WAITPKG, which is added to supported CPUID
> recently as a fix but QEMU exposes it to guest only when "-overcommit
> cpu-pm"

WAITPKG is not included in KVM_GET_SUPPORTED_CPUID either.  QEMU detects
it through the MSR_IA32_UMWAIT register.

Paolo


  reply	other threads:[~2020-10-22 14:06 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-22  1:34 [PATCH] KVM: X86: Expose KVM_HINTS_REALTIME in KVM_GET_SUPPORTED_CPUID Wanpeng Li
2020-10-22 13:02 ` Paolo Bonzini
2020-10-22 13:25   ` Vitaly Kuznetsov
2020-10-22 13:31   ` Xiaoyao Li
2020-10-22 14:06     ` Paolo Bonzini [this message]
2020-10-22 14:28       ` Xiaoyao Li
2020-10-22 14:44         ` Paolo Bonzini
2020-10-22 16:35   ` Jim Mattson
2020-10-22 16:37     ` Paolo Bonzini
2020-10-22 17:13       ` Jim Mattson
2020-10-23  9:07         ` Paolo Bonzini
2020-10-23 17:03           ` Jim Mattson
2020-10-23  0:27   ` Wanpeng Li

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