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Re: [PATCH v2] Grab the EFI System Resource Table and check it
- To: Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx>
- From: Luca Fancellu <Luca.Fancellu@xxxxxxx>
- Date: Mon, 4 Apr 2022 11:08:56 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <Bertrand.Marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 04 Apr 2022 11:10:00 +0000
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- Thread-topic: [PATCH v2] Grab the EFI System Resource Table and check it
> On 2 Apr 2022, at 00:14, Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx>
> wrote:
>
> The EFI System Resource Table (ESRT) is necessary for fwupd to identify
> firmware updates to install. According to the UEFI specification §23.4,
> the table shall be stored in memory of type EfiBootServicesData.
> Therefore, Xen must avoid reusing that memory for other purposes, so
> that Linux can access the ESRT. Additionally, Xen must mark the memory
> as reserved, so that Linux knows accessing it is safe.
>
> See https://lore.kernel.org/xen-devel/20200818184018.GN1679@mail-itl/T/
> for details.
>
> Signed-off-by: Demi Marie Obenour <demi@xxxxxxxxxxxxxxxxxxxxxx>
Hi,
I’ve tested the patch on an arm machine booting Xen+Dom0 through EFI,
unfortunately
I could not test the functionality.
Cheers,
Luca
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