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OvmfPkg/VirtNorFlashDxe: map flash memory as uncacheable 

Switching from the ArmPlatformPkg/NorFlashDxe driver to the
OvmfPkg/VirtNorFlashDxe driver had the side effect that flash address
space got registered as EFI_MEMORY_WC instead of EFI_MEMORY_UC.

That confuses the linux kernel's numa code, seems this makes kernel
consider the flash being node memory.  "lsmem" changes from ...

    RANGE                                 SIZE  STATE REMOVABLE BLOCK
    0x0000000040000000-0x000000013fffffff   4G online       yes  8-39

... to ...

    RANGE                                  SIZE  STATE REMOVABLE BLOCK
    0x0000000000000000-0x0000000007ffffff  128M online       yes     0
    0x0000000040000000-0x000000013fffffff    4G online       yes  8-39

... and in the kernel log got new error lines:

    NUMA: Warning: invalid memblk node 512 [mem 0x0000000004000000-0x0000000007ffffff]
    NUMA: Faking a node at [mem 0x0000000004000000-0x000000013fffffff]

Changing the attributes back to EFI_MEMORY_UC fixes this.

Fixes: b92298af82 ("ArmVirtPkg/ArmVirtQemu: migrate to OVMF's VirtNorFlashDxe")
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Gerd Hoffmann 2023-01-11 19:00:23 +01:00 committed by mergify[bot]
parent 85fd05ab97
commit e5ec3ba409
1 changed files with 2 additions and 2 deletions
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4
OvmfPkg/VirtNorFlashDxe/VirtNorFlashDxe.c
View File

@ -394,14 +394,14 @@ NorFlashFvbInitialize (
EfiGcdMemoryTypeMemoryMappedIo,
Instance->DeviceBaseAddress,
RuntimeMmioRegionSize,
EFI_MEMORY_WC | EFI_MEMORY_RUNTIME
EFI_MEMORY_UC | EFI_MEMORY_RUNTIME
);
ASSERT_EFI_ERROR (Status);
Status = gDS->SetMemorySpaceAttributes (
Instance->DeviceBaseAddress,
RuntimeMmioRegionSize,
EFI_MEMORY_WC | EFI_MEMORY_RUNTIME
EFI_MEMORY_UC | EFI_MEMORY_RUNTIME
);
ASSERT_EFI_ERROR (Status);