From: Peter Zijlstra <peterz@infradead.org>
To: Eduardo Valentin <eduval@amazon.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
rkrcmar@redhat.com, Jonathan Corbet <corbet@lwn.net>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
x86@kernel.org, Waiman Long <longman@redhat.com>,
kvm@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org,
"Jan H . Schoenherr" <jschoenh@amazon.de>,
Anthony Liguori <aliguori@amazon.com>
Subject: Re: [PATCH 1/1] locking/qspinlock/x86: Avoid test-and-set when PV_DEDICATED is set
Date: Tue, 24 Oct 2017 10:13:45 +0200 [thread overview]
Message-ID: <20171024081345.GK3165@worktop.lehotels.local> (raw)
In-Reply-To: <1508805867-14583-1-git-send-email-eduval@amazon.com>
On Mon, Oct 23, 2017 at 05:44:27PM -0700, Eduardo Valentin wrote:
> @@ -46,6 +48,8 @@ static inline bool virt_spin_lock(struct qspinlock *lock)
> if (!static_cpu_has(X86_FEATURE_HYPERVISOR))
> return false;
>
> + if (kvm_para_has_feature(KVM_FEATURE_PV_DEDICATED))
> + return false;
> /*
> * On hypervisors without PARAVIRT_SPINLOCKS support we fall
> * back to a Test-and-Set spinlock, because fair locks have
This does not apply. Much has been changed here recently.
next prev parent reply other threads:[~2017-10-24 8:13 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-24 0:44 [PATCH 1/1] locking/qspinlock/x86: Avoid test-and-set when PV_DEDICATED is set Eduardo Valentin
2017-10-24 8:13 ` Peter Zijlstra [this message]
2017-10-24 15:37 ` Eduardo Valentin
2017-10-24 16:07 ` Waiman Long
2017-10-24 16:26 ` Eduardo Valentin
2017-10-24 11:18 ` Radim Krčmář
2017-10-31 17:02 ` Eduardo Valentin
2017-11-08 18:41 ` Radim Krčmář
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