From: Paolo Bonzini <pbonzini@redhat.com>
To: Tao Xu <tao3.xu@intel.com>
Cc: rkrcmar@redhat.com, corbet@lwn.net, tglx@linutronix.de,
mingo@redhat.com, bp@alien8.de, hpa@zytor.com,
sean.j.christopherson@intel.com, x86@kernel.org,
kvm@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org, jingqi.liu@intel.com
Subject: Re: [PATCH v2 1/3] KVM: x86: add support for user wait instructions
Date: Wed, 29 May 2019 04:38:53 +0200 [thread overview]
Message-ID: <b5daf72d-d764-baa4-8e7f-b09dff417786@redhat.com> (raw)
In-Reply-To: <c1b27714-2eb8-055e-f26c-e17787d83bb6@intel.com>
On 29/05/19 04:05, Tao Xu wrote:
>>
>
> Thank you Paolo, but I have another question. I was wondering if it is
> appropriate to enable X86_FEATURE_WAITPKG when QEMU uses "-overcommit
> cpu-pm=on"?
"-overcommit" only establishes the behavior of KVM, it doesn't change
the cpuid bits. So you'd need "-cpu" as well.
Paolo
> Or just enable X86_FEATURE_WAITPKG when QEMU add the feature
> "-cpu host,+waitpkg"? User wait instructions is the wait or pause
> instructions may be executed at any privilege level, but can use
> IA32_UMWAIT_CONTROL to set the maximum time.
next prev parent reply other threads:[~2019-05-29 2:38 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-24 7:56 [PATCH v2 0/3] KVM: x86: Enable user wait instructions Tao Xu
2019-05-24 7:56 ` [PATCH v2 1/3] KVM: x86: add support for " Tao Xu
2019-05-27 10:30 ` Peter Zijlstra
2019-05-28 5:11 ` Tao Xu
2019-05-28 6:11 ` Wanpeng Li
2019-05-28 7:19 ` Tao Xu
2019-05-29 1:26 ` Paolo Bonzini
2019-05-29 1:25 ` Paolo Bonzini
2019-05-29 1:24 ` Paolo Bonzini
2019-05-29 2:05 ` Tao Xu
2019-05-29 2:38 ` Paolo Bonzini [this message]
2019-05-29 3:12 ` Tao Xu
2019-05-24 7:56 ` [PATCH v2 2/3] KVM: vmx: Emulate MSR IA32_UMWAIT_CONTROL Tao Xu
2019-05-29 1:29 ` Paolo Bonzini
2019-05-29 1:38 ` Tao Xu
2019-05-24 7:56 ` [PATCH v2 3/3] KVM: vmx: handle vm-exit for UMWAIT and TPAUSE Tao Xu
2019-05-29 1:28 ` Paolo Bonzini
2019-05-29 2:25 ` Tao Xu
2019-05-29 2:39 ` Paolo Bonzini
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