From: Paolo Bonzini <pbonzini@redhat.com>
To: Wanpeng Li <kernellwp@gmail.com>, Radim Krcmar <rkrcmar@redhat.com>
Cc: Eduardo Valentin <eduval@amazon.com>,
Matt Wilson <msw@amazon.com>, Jonathan Corbet <corbet@lwn.net>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
the arch/x86 maintainers <x86@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Waiman Long <longman@redhat.com>, kvm <kvm@vger.kernel.org>,
linux-doc@vger.kernel.org,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Jan H . Schoenherr" <jschoenh@amazon.de>,
Anthony Liguori <aliguori@amazon.com>
Subject: Re: [PATCHv3 1/1] locking/qspinlock/x86: Avoid test-and-set when PV_DEDICATED is set
Date: Fri, 10 Nov 2017 09:19:06 +0100 [thread overview]
Message-ID: <bbeaf134-b948-6ed4-d8a6-cdcb5279d1b3@redhat.com> (raw)
In-Reply-To: <CANRm+CxpcH5e1pspXSA6TgU-XCHntKHbg3R8iAyn5PnqFQsiWg@mail.gmail.com>
On 10/11/2017 07:07, Wanpeng Li wrote:
>>> You should also add a cpuid flag in kvm part.
>> It is better without that. The flag has no dependency on KVM (kernel
>> hypervisor) code.
> Do you mean -cpu host, +xxxx，I think it will result in "warning: host
> doesn't support requested feature: CPUID.40000001H:eax.XXXXXX"
There are some exceptions where QEMU overrides the values of
KVM_GET_SUPPORTED_CPUID.
I think it is better to add the flag to KVM *and* to QEMU's override in
kvm_arch_get_supported_cpuid (target/i386/kvm.c).
Paolo
prev parent reply other threads:[~2017-11-10 8:19 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-06 20:26 Eduardo Valentin
2017-11-07 12:23 ` Paolo Bonzini
2017-11-07 12:39 ` Eduardo Valentin
2017-11-07 12:43 ` Paolo Bonzini
2017-11-08 8:45 ` Eduardo Valentin
2017-11-08 17:36 ` Radim Krčmář
2017-11-09 8:55 ` Eduardo Valentin
2017-11-09 14:17 ` Radim Krčmář
2017-11-16 4:54 ` Eduardo Valentin
2017-11-27 0:43 ` Wanpeng Li
2017-11-09 12:43 ` Wanpeng Li
2017-11-09 15:53 ` Pankaj Gupta
2017-11-09 16:05 ` Radim Krcmar
2017-11-09 16:17 ` Peter Zijlstra
2017-11-09 16:37 ` Pankaj Gupta
2017-11-09 16:45 ` Radim Krcmar
2017-11-09 17:12 ` Peter Zijlstra
2017-11-09 17:15 ` Peter Zijlstra
2017-11-09 17:28 ` Peter Zijlstra
2017-11-09 17:35 ` Radim Krcmar
2017-11-10 2:07 ` Wanpeng Li
2017-11-10 7:59 ` Peter Zijlstra
2017-11-10 8:04 ` Wanpeng Li
2017-11-09 17:31 ` Radim Krcmar
2017-11-09 16:00 ` Radim Krcmar
2017-11-10 6:07 ` Wanpeng Li
2017-11-10 8:19 ` Paolo Bonzini [this message]
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