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system/physmem: make ram_block_discard_range() handle guest_memfd

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Most callers of ram_block_discard_range() want to discard both the
shared and guest_memfd backing. Only kvm_convert_memory() intentionally
discards a single plane during private/shared conversions.

Rename the current implementation to ram_block_discard_shared_range()
and make ram_block_discard_range() a composite that also discards
guest_memfd when present (rb->guest_memfd >= 0). This ensures callers
like virtio-mem, virtio-balloon, hv-balloon, migration.. reclaim
private pages on discard.

Update kvm_convert_memory() to use the plane-specific
ram_block_discard_shared_range() since it only needs to discard
the shared backing when converting to private.

Likewise, after TDVF image copy, use ram_block_discard_shared_range().

Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Link: https://lore.kernel.org/r/20260604-rdm5-v5-11-5768e6a0943d@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Marc-André Lureau
2026-06-04 17:43:57 +04:00
committed by Peter Xu
parent c2237aaf6d
commit 1f3241bcae
5 changed files with 26 additions and 8 deletions
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2
accel/kvm/kvm-all.c
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@@ -3422,7 +3422,7 @@ int kvm_convert_memory(hwaddr start, hwaddr size, bool to_private)
*/
goto out_unref;
}
ret = ram_block_discard_range(rb, offset, size);
ret = ram_block_discard_shared_range(rb, offset, size);
} else {
ret = ram_block_discard_guest_memfd_range(rb, offset, size);
}