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Re: preparations for 4.17.4
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 27 Mar 2024 12:33:32 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Anthony Perard <anthony.perard@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Kelly Choi <kelly.choi@xxxxxxxxx>
- Delivery-date: Wed, 27 Mar 2024 12:33:52 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 27/03/2024 12:23 pm, Jan Beulich wrote:
> All,
>
> the release is due in two to three weeks. Please point out backports you find
> missing from the respective staging branch, but which you consider relevant.
>
> Note that this is going to be the last Xen Project coordinated ordinary stable
> release from this branch; the branch will move into security-only support mode
> afterwards.
1) livepatching of .rodata:
989556c6f8ca - xen/virtual-region: Rename the start/end fields
ef969144a425 - xen/virtual-region: Include rodata pointers
b083b1c393dc - x86/livepatch: Relax permissions on rodata too
And technically "x86/mm: fix detection of last L1 entry in
modify_xen_mappings_lite()" too but you've already backported this one.
Patching .rodata worked before Xen 4.17, and was broken (left as a TODO)
when I adjusted Xen to stop using CR0.WP=0 for patching.
2) Policy fixes:
e2d8a6522516 - x86/cpu-policy: Fix visibility of HTT/CMP_LEGACY in max
policies
This is a real bugfix for a real regression we found updating from Xen
4.13 -> 4.17. It has a dependency on
5420aa165dfa - x86/cpu-policy: Hide x2APIC from PV guests
which I know you had more concern with. FWIW, I'm certain its a good
fix, and should be backported.
3) Test fixes:
0263dc9069dd - tests/resource: Fix HVM guest in !SHADOW builds
It's minor, but does make a difference for those of us who run these
tests regularly.
4) Watchdog fixes:
9e18f339830c - x86/boot: Improve the boot watchdog determination of
stuck cpus
131892e0dcc1 - x86/boot: Support the watchdog on newer AMD systems
You took "x86/boot: Fix setup_apic_nmi_watchdog() to fail more cleanly"
and the first of the two patches is in the same category IMO. The
second I also feel ok to take for the in-support releases, particularly
as all it is doing is dropping a family list.
5) Ucode scan stability (For 4.18 only)
Xen 4.18 had "x86/ucode: Refresh raw CPU policy after microcode load" in
it's .0 release, so should also gain:
cf7fe8b72dea - x86/ucode: Fix stability of the raw CPU Policy rescan
I've only noticed because I've got them both backported to 4.17 in
XenServer, but I don't think upstream wants to take that route.
~Andrew
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