Commit f2a64032 authored by Alexander Graf's avatar Alexander Graf

kvm: Fix memory slot page alignment logic

Memory slots have to be page aligned to get entered into KVM. There
is existing logic that tries to ensure that we pad memory slots that
are not page aligned to the biggest region that would still fit in the
alignment requirements.

Unfortunately, that logic is broken. It tries to calculate the start
offset based on the region size.

Fix up the logic to do the thing it was intended to do and document it
properly in the comment above it.

With this patch applied, I can successfully run an e500 guest with more
than 3GB RAM (at which point RAM starts overlapping subpage memory regions).

Cc: qemu-stable@nongnu.org
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
parent 3ade1a05
......@@ -634,8 +634,10 @@ static void kvm_set_phys_mem(MemoryRegionSection *section, bool add)
unsigned delta;
/* kvm works in page size chunks, but the function may be called
with sub-page size and unaligned start address. */
delta = TARGET_PAGE_ALIGN(size) - size;
with sub-page size and unaligned start address. Pad the start
address to next and truncate size to previous page boundary. */
delta = (TARGET_PAGE_SIZE - (start_addr & ~TARGET_PAGE_MASK));
delta &= ~TARGET_PAGE_MASK;
if (delta > size) {
return;
}
......
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