Re: [Xen-devel] [PATCH v3 0/2] Optionally call EFI SetVirtualAddressMap()

[Jason Andryuk <jandryuk@xxxxxxxxx>]

On Sat, Oct 12, 2019 at 6:11 PM Marek Marczykowski-Górecki
<marmarek@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> Workaround buggy UEFI accessing boot services memory after ExitBootServices().
> Patches discussed here:
> https://lists.xenproject.org/archives/html/xen-devel/2019-08/msg00701.html
>
> In addition to the tests below, I've tested kexec on xen.efi with this option
> enabled and it (still) works.
>
> Test results on few laptops:
>
> Thinkpad x230, firmware version 2.77:
>  - without the patch: crashes on RS call (mapbs helps)
>  - with patch: works
>  - same with xen.efi and MB2
>
> Librem 14 v1, firmware version (AMI) ARUD026 (06/18/2015):
>  - without the patch: works
>  - with the patch: works
>  - same with xen.efi and MB2
>
> Dell Latitude E6420, firmware version A21:
>  this machine requires efi=attr=uc workaround
>  - without the patch: dom0 hangs before sending any message to the console 
> (even with earlyprintk=xen etc)
>  - with the patch: crashes before dom0 prints anything: mm.c:896:d0v0 
> non-privileged attempt to map MMIO space 2c2c2c2c2c
>  - same with xen.efi and MB2
>
> Thinkpad W540:
>  - without the patch: crashes on RS call (only efi=no-rs helps)
>  - with patch: works
>  - tested only with MB2
>
> Thinkpad X1 Carbon gen5, firmware version 1.22 (2017-07-04):
>  - without the patch: works
>  - with patch: works
>  - tested only xen.efi
>
> Thinkpad P52, firmware version 1.25 (2018-04-15):
>  - without the patch (MB2): hangs on RS call (mapbs helps)
>  - without the patch (xen.efi): works(?!)
>  - with the patch: works
>  - tested with xen.efi and MB2
>
> Changes in v2:
>  - fix boot with xen.efi (efi_memmap at this point still needs to be accessed
>    via physical address). TBH, I don't understand why previous version worked
>    with MB2 - is directmap mapped at this point?

v1 failed to boot for me.

For v3:
Dell Latitude 5580, firmware 1.16.0
 - without the patch: works
 - with patch: works
 - tested only xen.efi

Tested-by: Jason Andryuk <jandryuk@xxxxxxxxx>

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxxx
https://lists.xenproject.org/mailman/listinfo/xen-devel