Workaround buggy UEFI accessing boot services memory after ExitBootServices().
Patches discussed here:
https://lists.xenproject.org/archives/html/xen-devel/2019-08/msg00701.html
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?
Cc: Juergen Gross <jgross@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: George Dunlap <George.Dunlap@eu.citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Julien Grall <julien.grall@arm.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Tim Deegan <tim@xen.org>
Cc: Wei Liu <wl@xen.org>
Cc: Jason Andryuk <jandryuk@gmail.com>
Marek Marczykowski-Górecki (2):
efi: remove old SetVirtualAddressMap() arrangement
xen/efi: optionally call SetVirtualAddressMap()
xen/common/Kconfig | 13 ++++++++++++-
xen/common/efi/boot.c | 48 +++++++++++++++++++++++---------------------
2 files changed, 39 insertions(+), 22 deletions(-)
base-commit: 7a4e6711114905b3cbbe48e81c3222361a7f3579
--
git-series 0.9.1
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