Re: [Xen-devel] RIP register value in p2m_mem_access_check()

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 06.03.13 at 14:49, Razvan Cojocaru <rzvncj@xxxxxxxxx> wrote:
>>  That wouldn't match your observation (the two values were
>> much farther apart), unless a call or jump got emulated.
>>
>> Further, after emulation, the user_regs.eip value should be the
>> canonical one.
> 
> Well, I've downloaded and installed a fresh copy of Xen 4.2.0 from the 
> official website, and added the printk() to p2m.c (the only modification 
> I've done):
> 
> 1311         req->vcpu_id = v->vcpu_id;
> 1312
> 1313         printk("v->arch.user_regs.eip: 0x%016lx, 
> __vmread(GUEST_RIP):0x%016lx\n",
> 1314                v->arch.user_regs.eip, __vmread(GUEST_RIP));
> 1315     }

I know close to nothing about the paths that can lead here, and
hence I can't assess whether expecting consistency at this point
is valid. All I can tell is that right after VM exit (i.e. at the top of
vmx_vmexit_handler()) the two values ought to be consistent.

Jan


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