Re: [Xen-devel] [PATCH] xen/x86/pvh: Use HVM's flush_tlb_others op

[Boris Ostrovsky]

On 12/14/2015 08:58 AM, David Vrabel wrote:
> On 13/12/15 00:25, Boris Ostrovsky wrote:
> > Using MMUEXT_TLB_FLUSH_MULTI doesn't buy us much since the hypervisor
> > will likely perform same IPIs as would have the guest.
> >
> > More importantly, using MMUEXT_INVLPG_MULTI may not to invalidate the
> > guest's address on remote CPU (when, for example, VCPU from another guest
> > is running there).
> >
> > Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> > Suggested-by: Jan Beulich <jbeulich@xxxxxxxx>
> > Cc: stable@xxxxxxxxxxxxxxx # 3.14+
> Applied to for-linus-4.4, thanks.  But given that PVH is experimental
> I've dropped the stable Cc.

The reason I want this to go to stable is that I will be removing access 
to MMUEXT_TLB_FLUSH_MULTI and MMUEXT_INVLPG_MULTI to PVH guests in the 
hypervisor (as part of merging HVM and PVH hypercall tables) and that 
will result in essentially unbootable PVH guests due to warnings flood.

-boris
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