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Re: [PATCH][4.17] EFI: don't convert memory marked for runtime use to ordinary RAM
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 4 Oct 2022 10:06:36 +0200
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- Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Henry Wang <Henry.Wang@xxxxxxx>
- Delivery-date: Tue, 04 Oct 2022 08:06:42 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 30.09.2022 16:28, Roger Pau Monné wrote:
> On Fri, Sep 30, 2022 at 09:50:40AM +0200, 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.
>
> What about dom0? Should it be translated to E820_RESERVED so that
> dom0 doesn't try to use it either?
I'm afraid I don't understand the questions. Not the least because I
think "it" can't really mean "dom0" from the earlier sentence.
Jan
> I guess using E820_RESERVED
> could also confuse dom0 about ACPI data placement.
>
> Thanks, Roger.
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