Re: [Xen-devel] [PATCH 18/18] PVH xen: introduce vmx_pvh.c

[Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>]

On Wed, 03 Jul 2013 11:25:49 +0100
"Jan Beulich" <JBeulich@xxxxxxxx> wrote:

> >>> On 03.07.13 at 03:40, Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
> >>> wrote:
> > On Fri, 28 Jun 2013 10:44:08 +0100
> > "Jan Beulich" <JBeulich@xxxxxxxx> wrote:
> > 
> >> >>> On 28.06.13 at 04:28, Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
> >> >>> wrote:
> >> > On Tue, 25 Jun 2013 11:49:57 +0100 "Jan Beulich"
> >> > <JBeulich@xxxxxxxx> wrote:
> > ...... 
> >> And btw., looking at that patch again I'm also getting the
> >> impression that the GS base handling in that function is lacking
> >> consideration of VGCF_in_kernel.
> > 
> > I still fail to see what VGCF_in_kernel has to do with GS base for 
> > PVH guest. The flag should be irrelevant for PVH IMO. Can you kindly
> > elaborate a bit?
> 
> VGCF_in_kernel specifies whether a guest wants to start its vCPU
> in user of kernel mode (why the interface permits that is another
> question, but you have to play by what is there).

My understanding is because of the trap bounce, we need to keep track
of kernel/user mode 64bit PV guest in ring3. Fortunatley, nothing of
that for PVH.

thanks
mukesh


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