Re: [PATCH 1/9] x86/pv: fix MMUEXT_FLUSH_CACHE to flush all pCPU caches

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Mon, May 12, 2025 at 04:11:51PM +0200, Jan Beulich wrote:
> On 06.05.2025 10:31, Roger Pau Monne wrote:
> > The implementation of MMUEXT_FLUSH_CACHE is bogus, as it doesn't account to
> > flush the cache of any previous pCPU where the current vCPU might have run,
> > and hence is likely to not work as expected.
> > 
> > Fix this by resorting to use the same logic as MMUEXT_FLUSH_CACHE_GLOBAL,
> > which will be correct in all cases.
> > 
> > Fixes: 534ffcb416bb ("Fix WBINVD by adding a new hypercall.")
> 
> Oh, and: I've looked up this hash, and found a "trivial merge". Are you sure
> here?

Indeed, sorry.  I've made a mistake and copied the wrong hash, it
should be 8e90e37e6db8.  The change subject is correct however.

Thanks, Roger.