hw: arm: acpi: Fix incorrect checksums in RSDP

When RSDP table was introduced (d4bec5d87), we calculated only legacy
checksum, and that was incorrect as it
 - specified rev=2 and forgot about extended checksum.
 - legacy checksum calculated on full table instead of the 1st 20 bytes

Fix it by adding extended checksum calculation and using correct
size for legacy checksum.

While at it use explicit constants to specify sub/full tables
sizes instead of relying on AcpiRsdpDescriptor size and fields offsets.
The follow up commits will convert this table to build_append_int_noprefix() API,
will use constants anyway and remove unused AcpiRsdpDescriptor structure.

Based on "[PATCH v5 05/24] hw: acpi: Implement XSDT support for  RSDP"
by Samuel Ortiz, who did it right in his impl.

Fixes: d4bec5d87 ("hw/arm/virt-acpi-build: Generate RSDP table")
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
CC: Ard Biesheuvel <ard.biesheuvel@linaro.org>
CC: Shannon Zhao <shannon.zhaosl@gmail.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index fcaa3508920670a45a57a74611283d2449ea8cff..083590005264b4a08a49c6d54b2dc31996ef3c73 100644 (file)
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -390,8 +390,13 @@ build_rsdp(GArray *rsdp_table, BIOSLinker *linker, unsigned xsdt_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);
+
+    /* Extended checksum to be filled by Guest linker */
+    bios_linker_loader_add_checksum(linker, ACPI_BUILD_RSDP_FILE,
+        (char *)rsdp - rsdp_table->data, 36 /* ACPI rev 2.0 RSDP size */,
+        (char *)&rsdp->extended_checksum - rsdp_table->data);
 }
 
 static void