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[Qemu-devel] [PATCH v2 3/8] hw: i386: Use correct RSDT length for checks
From: |
Samuel Ortiz |
Subject: |
[Qemu-devel] [PATCH v2 3/8] hw: i386: Use correct RSDT length for checksum |
Date: |
Thu, 29 Nov 2018 14:24:23 +0100 |
From: Igor Mammedov <address@hidden>
AcpiRsdpDescriptor describes revision 2 RSDP table so using sizeof(*rsdp)
for checksum calculation isn't correct since we are adding extra 16 bytes.
But acpi_data_push() zeroes out table, so just by luck we are summing up
exta zeros which still yelds correct checksum.
Fix it up by explicitly stating table size instead of using
pointer arithmetics on stucture.
PS:
Extra 16 bytes are still wasted, but droping them will break migration
for machines older than 2.3 due to size mismatch, for 2.3 and older it's
not an issue since they are using resizable memory regions (a1666142d)
for ACPI blobs. So keep wasting memory to avoid breaking old machines.
Fixes: 72c194f7e (i386: ACPI table generation code from seabios)
Signed-off-by: Igor Mammedov <address@hidden>
Reviewed-by: Samuel Ortiz <address@hidden>
Signed-off-by: Samuel Ortiz <address@hidden>
---
hw/i386/acpi-build.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 35f17d0d91..fb877648ac 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -2550,6 +2550,11 @@ build_amd_iommu(GArray *table_data, BIOSLinker *linker)
static void
build_rsdp(GArray *rsdp_table, BIOSLinker *linker, unsigned rsdt_tbl_offset)
{
+ /* AcpiRsdpDescriptor describes revision 2 RSDP table and as result we
+ * allocate extra 16 bytes for pc/q35 RSDP rev1 as well. Keep extra 16
bytes
+ * wasted to make sure we won't breake migration for machine types older
+ * than 2.3 due to size mismatch.
+ */
AcpiRsdpDescriptor *rsdp = acpi_data_push(rsdp_table, sizeof *rsdp);
unsigned rsdt_pa_size = sizeof(rsdp->rsdt_physical_address);
unsigned rsdt_pa_offset =
@@ -2567,7 +2572,7 @@ build_rsdp(GArray *rsdp_table, BIOSLinker *linker,
unsigned rsdt_tbl_offset)
/* Checksum to be filled by Guest linker */
bios_linker_loader_add_checksum(linker, ACPI_BUILD_RSDP_FILE,
- (char *)rsdp - rsdp_table->data, sizeof *rsdp,
+ (char *)rsdp - rsdp_table->data, 20 /* ACPI rev 1.0 RSDP size */,
(char *)&rsdp->checksum - rsdp_table->data);
}
--
2.19.2
[Qemu-devel] [PATCH v2 5/8] hw: arm: Convert the RSDP build to the buid_append_foo() API, Samuel Ortiz, 2018/11/29
[Qemu-devel] [PATCH v2 6/8] hw: arm: Support both legacy and current RSDP build, Samuel Ortiz, 2018/11/29