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xen/mapcache: introduce xen_replace_cache_entry()

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This new call is trying to update a requested map cache entry
according to the changes in the physmap. The call is searching
for the entry, unmaps it and maps again at the same place using
a new guest address. If the mapping is dummy this call will
make it real.

This function makes use of a new xenforeignmemory_map2() call
with an extended interface that was recently introduced in
libxenforeignmemory [1].

[1] https://www.mail-archive.com/xen-devel@lists.xen.org/msg113007.html

Signed-off-by: Igor Druzhinin <igor.druzhinin@citrix.com>
Reviewed-by: Paul Durrant <paul.durrant@citrix.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
This commit is contained in:
Igor Druzhinin 2017-07-10 23:40:02 +01:00 • committed by Stefano Stabellini
parent 759235653d
commit 5ba3d75645
4 changed files with 119 additions and 9 deletions
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11
include/sysemu/xen-mapcache.h
View file

@ -21,7 +21,9 @@ uint8_t *xen_map_cache(hwaddr phys_addr, hwaddr size,
ram_addr_t xen_ram_addr_from_mapcache(void *ptr);
void xen_invalidate_map_cache_entry(uint8_t *buffer);
void xen_invalidate_map_cache(void);
uint8_t *xen_replace_cache_entry(hwaddr old_phys_addr,
hwaddr new_phys_addr,
hwaddr size);
#else
static inline void xen_map_cache_init(phys_offset_to_gaddr_t f,
@ -50,6 +52,13 @@ static inline void xen_invalidate_map_cache(void)
{
}
static inline uint8_t *xen_replace_cache_entry(hwaddr old_phys_addr,
hwaddr new_phys_addr,
hwaddr size)
{
abort();
}
#endif
#endif /* XEN_MAPCACHE_H */