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RE: [PATCH v2][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: Henry Wang <Henry.Wang@xxxxxxx>
- Date: Thu, 6 Oct 2022 08:46:13 +0000
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>, Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
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- Thread-topic: [PATCH v2][4.17] EFI: don't convert memory marked for runtime use to ordinary RAM
Hi Jan,
> -----Original Message-----
> From: Jan Beulich <jbeulich@xxxxxxxx>
> Subject: [PATCH v2][4.17] EFI: don't convert memory marked for runtime use
> to ordinary RAM
>
> 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 it would be a bug if the Dom0 kernel tried
> to do so, bypassing Xen's memory management), 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>
> Reviewed-by: Luca Fancellu <luca.fancellu@xxxxxxx> # Arm
> Tested-By: Luca Fancellu <luca.fancellu@xxxxxxx> # Arm
> Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx> #arm
Release-acked-by: Henry Wang <Henry.Wang@xxxxxxx>
Kind regards,
Henry
> ---
> v2: Amend description.
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