[Qemu-devel] [PULL 1/1] acpi: fix bios linker loadder COMMAND_ALLOCATE on bigendian host

[Michael S. Tsirkin]

From: Igor Mammedov <address@hidden>

'make check' fails with:

ERROR:tests/bios-tables-test.c:493:load_expected_aml:
   assertion failed: (g_file_test(aml_file, G_FILE_TEST_EXISTS))

since commit:
caf50c7166a6ed96c462ab5db4b495e1234e4cc6
tests: pc: acpi: drop not needed 'expected SSDT' blobs

Assert happens because qemu-system-x86_64 generates
SSDT table and test looks for a corresponding expected
table to compare with.

However there is no expected SSDT blob anymore, since
QEMU souldn't generate one. As it happens BIOS is not
able to read ACPI tables from QEMU and fallbacks to
embeded legacy ACPI codepath, which generates SSDT.
That happens due to wrongly sized endiannes conversion
which makes
 uint8_t BiosLinkerLoaderEntry.alloc.zone
end up with 0 due to truncation of 32 bit integer
which on host is 1 or 2.

Fix it by dropping invalid cpu_to_le32() as uint8_t
doesn't require any conversion.

RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=1330174

Signed-off-by: Igor Mammedov <address@hidden>
Reviewed-by: Michael S. Tsirkin <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
Tested-by: Laurent Vivier <address@hidden>
Reviewed-by: Marcel Apfelbaum <address@hidden>
---
 hw/acpi/bios-linker-loader.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/hw/acpi/bios-linker-loader.c b/hw/acpi/bios-linker-loader.c
index ace9abb..5153ab1 100644
--- a/hw/acpi/bios-linker-loader.c
+++ b/hw/acpi/bios-linker-loader.c
@@ -135,9 +135,8 @@ void bios_linker_loader_alloc(GArray *linker,
     strncpy(entry.alloc.file, file, sizeof entry.alloc.file - 1);
     entry.command = cpu_to_le32(BIOS_LINKER_LOADER_COMMAND_ALLOCATE);
     entry.alloc.align = cpu_to_le32(alloc_align);
-    entry.alloc.zone = cpu_to_le32(alloc_fseg ?
-                                    BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG :
-                                    BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH);
+    entry.alloc.zone = alloc_fseg ? BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG :
+                                    BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH;
 
     /* Alloc entries must come first, so prepend them */
     g_array_prepend_vals(linker, &entry, sizeof entry);
-- 
MST