From: Avi Kivity <avi@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>
Cc: kvm@vger.kernel.org
Subject: Re: [PATCH 3/8] KVM: Activate fpu on clts
Date: Sun, 24 Jan 2010 09:20:13 +0200 [thread overview]
Message-ID: <4B5BF4AD.8090802@redhat.com> (raw)
In-Reply-To: <20100123185606.GC24943@amt.cnet>
On 01/23/2010 08:56 PM, Marcelo Tosatti wrote:
> On Thu, Jan 21, 2010 at 03:31:47PM +0200, Avi Kivity wrote:
>
>> Assume that if the guest executes clts, it knows what it's doing, and load the
>> guest fpu to prevent an #NM exception.
>>
>> Signed-off-by: Avi Kivity<avi@redhat.com>
>> ---
>>
> Out of curiosity, previously you assumed lazy activation on clts was a
> win. Why undo it?
>
It wasn't so much assuming it's a win, it's more I was too lazy to find
out. But it was easy to see from the traces that clts is often followed
by #NM.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
next prev parent reply other threads:[~2010-01-24 7:20 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-21 13:31 [PATCH 0/8] cr0/cr4/efer/fpu miscellaneous bits Avi Kivity
2010-01-21 13:31 ` [PATCH 1/8] KVM: Allow kvm_load_guest_fpu() even when !vcpu->fpu_active Avi Kivity
2010-01-21 13:31 ` [PATCH 2/8] KVM: Drop kvm_{load,put}_guest_fpu() exports Avi Kivity
2010-01-21 13:31 ` [PATCH 3/8] KVM: Activate fpu on clts Avi Kivity
2010-01-23 18:56 ` Marcelo Tosatti
2010-01-24 7:20 ` Avi Kivity [this message]
2010-02-02 8:16 ` Paolo Bonzini
2010-02-03 10:23 ` Gleb Natapov
2010-02-04 13:05 ` Avi Kivity
2010-02-04 13:11 ` Gleb Natapov
2010-02-04 17:56 ` Avi Kivity
2010-02-07 12:25 ` Avi Kivity
2010-01-21 13:31 ` [PATCH 4/8] KVM: Add a helper for checking if the guest is in protected mode Avi Kivity
2010-01-21 13:31 ` [PATCH 5/8] KVM: Move cr0/cr4/efer related helpers to x86.h Avi Kivity
2010-01-21 13:31 ` [PATCH 6/8] KVM: Rename vcpu->shadow_efer to efer Avi Kivity
2010-01-21 13:31 ` [PATCH 7/8] KVM: Optimize kvm_read_cr[04]_bits() Avi Kivity
2010-02-05 8:26 ` Jan Kiszka
2010-02-07 12:05 ` Avi Kivity
2010-02-07 12:33 ` Jan Kiszka
2010-02-07 12:37 ` Avi Kivity
2010-02-07 13:20 ` Jan Kiszka
2010-01-21 13:31 ` [PATCH 8/8] KVM: trace guest fpu loads and unloads Avi Kivity
2010-01-23 19:02 ` [PATCH 0/8] cr0/cr4/efer/fpu miscellaneous bits Marcelo Tosatti
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=4B5BF4AD.8090802@redhat.com \
--to=avi@redhat.com \
--cc=kvm@vger.kernel.org \
--cc=mtosatti@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox