Re: [PATCH v2] Grab the EFI System Resource Table and check it

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Mon, 4 Apr 2022, Luca Fancellu wrote:
> > 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.

I understand you couldn't test ESRT but did the basic Xen+Dom0 boot via
EFI on ARM work?