RE: [Xen-ia64-devel] RE: [PATCH 0/5] fix fpswa and related issues.

["Zhang, Xiantao" <xiantao.zhang@xxxxxxxxx>]

Isaku Yamahata wrote:
> On Wed, Dec 10, 2008 at 10:43:01AM -0700, Alex Williamson wrote:
>> On Tue, 2008-12-09 at 21:23 -0700, Alex Williamson wrote:
>>> On Wed, 2008-12-10 at 10:51 +0800, Zhang, Xiantao wrote:
>>>>> I've been testing this for a few hours today (over 25k
>>>>> iterations) and it seems to fix the problem for me.  Thanks!
>>>> 
>>>> Hi, Alex
>>>>         Have you verified vmx domain as well ?
>>> 
>>> Good point, no I was just testing in dom0.
>> 
>> Adding in Isaku's last patch and testing on an HVM domain, it doesn't
>> take long to hit problems.  4-way/4G HVM guest running 4 instances of
>> the test program in parallel will eventually get this in the guest
>> kernel: 
>> 
>> handle_fpu_swa: fp_emulate() returned -1
>> 
>> and the test program gets killed with a SIGFPE.
> 
> Just to make sure. Is fpswa.efi installed in hvm domain?
> You can also confirm it by dh command in efi shell.

Yes, I think it should be installed by default in OS distros. Before handing 
the trap in hypervisor, all traps are injected to guests, and handing it in 
hypervisor is just an optimization. 
Xiantao 
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