From: Paolo Bonzini <pbonzini@redhat.com>
To: Nadav Amit <nadav.amit@gmail.com>, fenghua.yu@intel.com
Cc: kvm list <kvm@vger.kernel.org>, Eduardo Habkost <ehabkost@redhat.com>
Subject: Re: KVM causes #GP on XRSTORS
Date: Fri, 21 Nov 2014 15:46:55 +0100 [thread overview]
Message-ID: <546F505F.9080309@redhat.com> (raw)
In-Reply-To: <AA52FB0B-FB19-4DC0-964B-2984040B15A6@gmail.com>
On 20/11/2014 17:34, Nadav Amit wrote:
> Fenghua,
>
> I got KVM (v3.17) crashing on a machine that supports XRSTORS - It appears to get a #GP when it is trying to load the guest FPU.
> One reason for the #GP is that XCOMP_BV[63] is zeroed on the guest_fpu, but I am not sure it is the only problem.
> Was KVM ever tested with XRSTORS?
What is the content of the CPUID[EAX=13,ECX=0] and CPUID[EAX=13,ECX=1]
leaves on the host?
Fenghua, which processors have XSAVEC, which have XGETBV with ECX=1, and
which have XSAVES? We need to expose this in QEMU, for which I can send
a patch later today or next week (CCing Eduardo for this).
We will also have to uncompact the XSAVE area either in KVM_GET_XSAVE or
in QEMU. It's probably not hard to do it in the kernel.
Paolo
next prev parent reply other threads:[~2014-11-21 14:47 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-20 16:34 KVM causes #GP on XRSTORS Nadav Amit
2014-11-20 22:18 ` Yu, Fenghua
2014-11-21 0:10 ` Wanpeng Li
2014-11-21 1:09 ` Nadav Amit
2014-11-21 14:46 ` Paolo Bonzini [this message]
2014-11-21 18:34 ` Paolo Bonzini
2014-11-24 2:05 ` Wanpeng Li
2014-11-25 18:41 ` Eduardo Habkost
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=546F505F.9080309@redhat.com \
--to=pbonzini@redhat.com \
--cc=ehabkost@redhat.com \
--cc=fenghua.yu@intel.com \
--cc=kvm@vger.kernel.org \
--cc=nadav.amit@gmail.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.