haraldwolff/qemu-patch-raspberry4
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kvmvapic: align start address as well as size

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The kvmvapic code remaps a section of ROM as RAM to allow the guest to
maintain state there.  It is careful to align the section size to a page
boundary, to avoid creating subpages, but neglects to do the same for
the start address.  These leads to an assert later on when the memory
core tries to create a page which is half RAM and half ROM.

Fix by aligning the start address to a page boundary.

This can be triggered by running qemu-system-x86_64 -enable-kvm -vga none.

Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Avi Kivity 2012-03-06 17:50:10 +02:00 committed by Anthony Liguori
parent 3e7ecd976b
commit 9512e4a9ed
1 changed files with 3 additions and 1 deletions
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4
hw/kvmvapic.c
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@ -578,8 +578,10 @@ static void vapic_map_rom_writable(VAPICROMState *s)
rom_size = ram[rom_paddr + 2] * ROM_BLOCK_SIZE;
s->rom_size = rom_size;
/* We need to round up to avoid creating subpages
/* We need to round to avoid creating subpages
* from which we cannot run code. */
rom_size += rom_paddr & ~TARGET_PAGE_MASK;
rom_paddr &= TARGET_PAGE_MASK;
rom_size = TARGET_PAGE_ALIGN(rom_size);
memory_region_init_alias(&s->rom, "kvmvapic-rom", section.mr, rom_paddr,