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Re: [PATCH][4.17] EFI: don't convert memory marked for runtime use to ordinary RAM
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>
- Date: Fri, 30 Sep 2022 12:53:46 +0000
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- Thread-topic: [PATCH][4.17] EFI: don't convert memory marked for runtime use to ordinary RAM
On 30/09/2022 08:50, Jan Beulich wrote:
> efi_init_memory() in both relevant places is treating EFI_MEMORY_RUNTIME
> higher priority than the type of the range. To avoid accessing memory at
> runtime which was re-used for other purposes, make
> efi_arch_process_memory_map() follow suit. While on x86 in theory the
> same would apply to EfiACPIReclaimMemory, we don't actually "reclaim"
> E820_ACPI memory there and hence that type's handling can be left alone.
>
> Fixes: bf6501a62e80 ("x86-64: EFI boot code")
> Fixes: facac0af87ef ("x86-64: EFI runtime code")
> Fixes: 6d70ea10d49f ("Add ARM EFI boot support")
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Isn't this also liable to be the root cause of the crash reported on
IRC, where a read-only page was being inserted into the heap?
~Andrew
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