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optionrom/pvh: scan entire RSDP Area

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Right now the PVH option rom scans for the RSDP from 0xE0000 to
0xE1FFF. This is probobly a typo, it should scan from 0xE0000 to
0xFFFFF.

This is actually an issue on some QEMU versions/machines. For example,
when I run QEMU the RSDP is placed at 0xf5ad0 which will not be picked
up by the current implementation.

This bug still allows a Linux guest to boot (in most configurations) as
the kernel will just scan for the RSDP if one isn't provided.

Signed-off-by: Joe Richey <joerichey@google.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Fixes: 2785dc7b17 ("optionrom: add new PVH option rom")
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Joe Richey 2020-03-03 02:52:47 -08:00 committed by Paolo Bonzini
parent 4ce1e15fbc
commit 770275ed0c
1 changed files with 1 additions and 1 deletions
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2
pc-bios/optionrom/pvh_main.c
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@ -29,7 +29,7 @@ asm (".code32"); /* this code will be executed in protected mode */
#define RSDP_SIGNATURE 0x2052545020445352LL /* "RSD PTR " */
#define RSDP_AREA_ADDR 0x000E0000
#define RSDP_AREA_SIZE 2048
#define RSDP_AREA_SIZE 0x00020000
#define EBDA_BASE_ADDR 0x0000040E
#define EBDA_SIZE 1024