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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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14
include/hw/xen/xen_common.h
View file

@ -78,6 +78,20 @@ static inline void *xenforeignmemory_map(xc_interface *h, uint32_t dom,
extern xenforeignmemory_handle *xen_fmem;
#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 41000
static inline void *xenforeignmemory_map2(xenforeignmemory_handle *h,
uint32_t dom, void *addr,
int prot, int flags, size_t pages,
const xen_pfn_t arr[/*pages*/],
int err[/*pages*/])
{
assert(addr == NULL && flags == 0);
return xenforeignmemory_map(h, dom, prot, pages, arr, err);
}
#endif
#if CONFIG_XEN_CTRL_INTERFACE_VERSION < 40900
typedef xc_interface xendevicemodel_handle;