Re: [PATCH v4 07/17] xen: mapcache: Refactor xen_replace_cache_entry_unlocked

["Edgar E. Iglesias" <edgar.iglesias@gmail.com>]

On Wed, May 1, 2024 at 10:46 PM Stefano Stabellini
<sstabellini@kernel.org> wrote:
>
> On Tue, 30 Apr 2024, Edgar E. Iglesias wrote:
> > From: "Edgar E. Iglesias" <edgar.iglesias@amd.com>
> >
> > Add MapCache argument to xen_replace_cache_entry_unlocked in
> > preparation for supporting multiple map caches.
> >
> > No functional change.
> >
> > Signed-off-by: Edgar E. Iglesias <edgar.iglesias@amd.com>
> > ---
> >  hw/xen/xen-mapcache.c | 8 +++++---
> >  1 file changed, 5 insertions(+), 3 deletions(-)
> >
> > diff --git a/hw/xen/xen-mapcache.c b/hw/xen/xen-mapcache.c
> > index d2deff70c8..6e758eff94 100644
> > --- a/hw/xen/xen-mapcache.c
> > +++ b/hw/xen/xen-mapcache.c
> > @@ -556,7 +556,8 @@ void xen_invalidate_map_cache(void)
> >      mapcache_unlock(mapcache);
> >  }
> >
> > -static uint8_t *xen_replace_cache_entry_unlocked(hwaddr old_phys_addr,
> > +static uint8_t *xen_replace_cache_entry_unlocked(MapCache *mc,
> > +                                                 hwaddr old_phys_addr,
> >                                                   hwaddr new_phys_addr,
> >                                                   hwaddr size)
> >  {
> > @@ -578,7 +579,7 @@ static uint8_t *xen_replace_cache_entry_unlocked(hwaddr old_phys_addr,
> >          cache_size += MCACHE_BUCKET_SIZE - (cache_size % MCACHE_BUCKET_SIZE);
> >      }
> >
> > -    entry = &mapcache->entry[address_index % mapcache->nr_buckets];
> > +    entry = &mc->entry[address_index % mc->nr_buckets];
> >      while (entry && !(entry->paddr_index == address_index &&
> >                        entry->size == cache_size)) {
> >          entry = entry->next;
>
> There is still a global mapcache pointer in use in this function:
>
>   xen_remap_bucket(mapcache, entry, entry->vaddr_base,
>


Thanks! I had accidentally put the change to use mc in future patches.
Will fix in v5.

Cheers,
Edgar


>
> > @@ -614,7 +615,8 @@ uint8_t *xen_replace_cache_entry(hwaddr old_phys_addr,
> >      uint8_t *p;
> >
> >      mapcache_lock(mapcache);
> > -    p = xen_replace_cache_entry_unlocked(old_phys_addr, new_phys_addr, size);
> > +    p = xen_replace_cache_entry_unlocked(mapcache, old_phys_addr,
> > +                                         new_phys_addr, size);
> >      mapcache_unlock(mapcache);
> >      return p;
> >  }
> > --
> > 2.40.1
> >