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xen: mapcache: Add support for grant mappings

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Add a second mapcache for grant mappings. The mapcache for
grants needs to work with XC_PAGE_SIZE granularity since
we can't map larger ranges than what has been granted to us.

Like with foreign mappings (xen_memory), machines using grants
are expected to initialize the xen_grants MR and map it
into their address-map accordingly.

CC: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@amd.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
This commit is contained in:
Edgar E. Iglesias 2024-04-30 10:26:45 +02:00
parent 49a7202979
commit 9ecdd4bf08
4 changed files with 144 additions and 37 deletions
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12
hw/xen/xen-hvm-common.c
View file

@ -10,12 +10,18 @@
#include "hw/boards.h"
#include "hw/xen/arch_hvm.h"
MemoryRegion xen_memory;
MemoryRegion xen_memory, xen_grants;
/* Check for xen memory. */
/* Check for any kind of xen memory, foreign mappings or grants. */
bool xen_mr_is_memory(MemoryRegion *mr)
{
return mr == &xen_memory;
return mr == &xen_memory || mr == &xen_grants;
}
/* Check specifically for grants. */
bool xen_mr_is_grants(MemoryRegion *mr)
{
return mr == &xen_grants;
}
void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size, MemoryRegion *mr,