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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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3
include/hw/xen/xen-hvm-common.h
View file

@ -16,6 +16,7 @@
#include <xen/hvm/ioreq.h>
extern MemoryRegion xen_memory;
extern MemoryRegion xen_grants;
extern MemoryListener xen_io_listener;
extern DeviceListener xen_device_listener;
@ -29,6 +30,8 @@ extern DeviceListener xen_device_listener;
do { } while (0)
#endif
#define XEN_GRANT_ADDR_OFF (1ULL << 63)
static inline uint32_t xen_vcpu_eport(shared_iopage_t *shared_page, int i)
{
return shared_page->vcpu_ioreq[i].vp_eport;