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Re: [Qemu-devel] [PATCH][uq/master] kvm: x86: Save/restore FPU OP, IP an
From: |
Jan Kiszka |
Subject: |
Re: [Qemu-devel] [PATCH][uq/master] kvm: x86: Save/restore FPU OP, IP and DP |
Date: |
Wed, 15 Jun 2011 13:45:36 +0200 |
User-agent: |
Mozilla/5.0 (X11; U; Linux i686 (x86_64); de; rv:1.8.1.12) Gecko/20080226 SUSE/2.0.0.12-1.1 Thunderbird/2.0.0.12 Mnenhy/0.7.5.666 |
On 2011-06-15 13:33, Avi Kivity wrote:
> On 06/15/2011 02:32 PM, Jan Kiszka wrote:
>>>
>>> If it isn't zero, there's still a good chance fopcode will be zero
>>> (64-bit userspace, thread that hasn't used the fpu since the last
>>> context switch, last opcode happened to be zero).
>>
>> I do not yet find "if fopcode is invalid, it is zero, just as IP and DP"
>> in the spec. What clears them reliably?
>
> FNINIT
OK, I see. So we simply check for all fields being zero and skip the
section in that case. The MSR doesn't actually to us here.
Will write v2.
Jan
--
Siemens AG, Corporate Technology, CT T DE IT 1
Corporate Competence Center Embedded Linux
- Re: [Qemu-devel] [PATCH][uq/master] kvm: x86: Save/restore FPU OP, IP and DP, (continued)
- Re: [Qemu-devel] [PATCH][uq/master] kvm: x86: Save/restore FPU OP, IP and DP, Avi Kivity, 2011/06/13
- Re: [Qemu-devel] [PATCH][uq/master] kvm: x86: Save/restore FPU OP, IP and DP, Jan Kiszka, 2011/06/14
- Re: [Qemu-devel] [PATCH][uq/master] kvm: x86: Save/restore FPU OP, IP and DP, Avi Kivity, 2011/06/15
- Re: [Qemu-devel] [PATCH][uq/master] kvm: x86: Save/restore FPU OP, IP and DP, Jan Kiszka, 2011/06/15
- Re: [Qemu-devel] [PATCH][uq/master] kvm: x86: Save/restore FPU OP, IP and DP, Jan Kiszka, 2011/06/15
- Re: [Qemu-devel] [PATCH][uq/master] kvm: x86: Save/restore FPU OP, IP and DP, Avi Kivity, 2011/06/15
- Re: [Qemu-devel] [PATCH][uq/master] kvm: x86: Save/restore FPU OP, IP and DP, Jan Kiszka, 2011/06/15
- Re: [Qemu-devel] [PATCH][uq/master] kvm: x86: Save/restore FPU OP, IP and DP, Avi Kivity, 2011/06/15
- Re: [Qemu-devel] [PATCH][uq/master] kvm: x86: Save/restore FPU OP, IP and DP,
Jan Kiszka <=
[Qemu-devel] [PATCH v2][uq/master] kvm: x86: Save/restore FPU OP, IP and DP, Jan Kiszka, 2011/06/15
Re: [Qemu-devel] [PATCH][uq/master] kvm: x86: Save/restore FPU OP, IP and DP, Christophe Fergeau, 2011/06/16