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physmem: Introduce ram_block_discard_guest_memfd_range()

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When memory page is converted from private to shared, the original
private memory is back'ed by guest_memfd. Introduce
ram_block_discard_guest_memfd_range() for discarding memory in
guest_memfd.

Based on a patch by Isaku Yamahata <isaku.yamahata@intel.com>.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
Message-ID: <20240320083945.991426-12-michael.roth@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiaoyao Li 2024-03-20 03:39:07 -05:00 • committed by Paolo Bonzini
parent 852f0048f3
commit b2e9426c04
2 changed files with 25 additions and 0 deletions
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2
include/exec/cpu-common.h
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@ -159,6 +159,8 @@ typedef int (RAMBlockIterFunc)(RAMBlock *rb, void *opaque);
int qemu_ram_foreach_block(RAMBlockIterFunc func, void *opaque);
int ram_block_discard_range(RAMBlock *rb, uint64_t start, size_t length);
int ram_block_discard_guest_memfd_range(RAMBlock *rb, uint64_t start,
size_t length);
#endif