From: Marcelo Tosatti <mtosatti@redhat.com>
To: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: Joel Schopp <joel.schopp@amd.com>, Gleb Natapov <gleb@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
kvm@vger.kernel.org, David Kaplan <David.Kaplan@amd.com>,
Joerg Roedel <joro@8bytes.org>,
linux-kernel@vger.kernel.org, Borislav Petkov <bp@alien8.de>
Subject: Re: [PATCH] x86: svm: make wbinvd faster
Date: Tue, 10 Mar 2015 19:37:13 -0300 [thread overview]
Message-ID: <20150310223713.GA17773@amt.cnet> (raw)
In-Reply-To: <20150310110131.GA12854@potion.brq.redhat.com>
On Tue, Mar 10, 2015 at 12:01:31PM +0100, Radim Krčmář wrote:
> 2015-03-09 20:28-0300, Marcelo Tosatti:
> > On Fri, Feb 27, 2015 at 06:19:18PM -0600, Joel Schopp wrote:
> > > From: David Kaplan <David.Kaplan@amd.com>
> > > No need to re-decode WBINVD since we know what it is from the intercept.
> > >
> > > Signed-off-by: David Kaplan <David.Kaplan@amd.com>
> > > [extracted from larger unlrelated patch, forward ported, tested]
> > > Signed-off-by: Joel Schopp <joel.schopp@amd.com>
> >
> > Can't you disable the intercept if need_emulate_wbinvd(vcpu) == false?
>
> I don't think we want to: it should be faster to intercept and ignore
> than to invalidate all caches. The exit doesn't affect other physical
> cores and costs just about 10(?) L3 cache misses.
Yes, right.
prev parent reply other threads:[~2015-03-10 22:37 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-28 0:19 [PATCH] x86: svm: make wbinvd faster Joel Schopp
2015-03-02 2:29 ` Bandan Das
2015-03-02 13:59 ` Radim Krčmář
2015-03-02 15:25 ` Bandan Das
2015-03-02 16:03 ` Radim Krčmář
2015-03-02 16:58 ` Joel Schopp
2015-03-02 14:09 ` Radim Krčmář
2015-03-09 23:28 ` Marcelo Tosatti
2015-03-10 11:01 ` Radim Krčmář
2015-03-10 22:37 ` Marcelo Tosatti [this message]
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