Re: [Xen-devel] [PATCH] x86/hvm/viridian: fix the TLB flush hypercall

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Andrew Cooper [mailto:andrew.cooper3@xxxxxxxxxx]
> Sent: 16 March 2016 13:37
> To: Jan Beulich; Paul Durrant
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx; Keir (Xen.org)
> Subject: Re: [PATCH] x86/hvm/viridian: fix the TLB flush hypercall
> 
> On 16/03/16 13:31, Jan Beulich wrote:
> >
> > That said, I now wonder anyway why this is a per-vCPU mask
> > instead of a per-pCPU one: There's no need for every vCPU in
> > the system to have its own afaics.
> 
> If every vcpu makes a viridian hypercall at the same time, Xen would end
> up clobbering same mask while trying to serve the hypercalls.
> 

Only if the hypercalls could be pre-empted during execution, which I don't 
think is the case, is it?

  Paul

> ~Andrew

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