Re: [PATCH v3 for-4.21 00/22] x86: FRED support

[Oleksii Kurochko <oleksii.kurochko@gmail.com>]

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On 10/4/25 12:53 AM, Andrew Cooper wrote:
> This is the combined MSR cleanup and FRED series.  Some patches of both v2's
> have already been committed.
>
> I have moved the MSR_IMM patch out.  It's not strictly needed for FRED, and
> really needs to go behind Jan's patch to use mergable sections for
> altinstructions which is definitely not making 4.21 at this point.
>
> I almost got access to a piece of real hardware in time, but that fell through
> at the last minute.
>
> In terms of timing, I know we're getting very tight for 4.21, but there has
> been an awful lot of disruption with travel and holidays recently.  Half the
> patches are already acked/reviewed, but can't easily go in due to logical
> dependencies (I suspect patches 15-17 could be committed right away as they're
> pretty independent.)
>
> Therefore I'd like to ask Oleksii whether the nominal release ack still
> stands.

If you're asking about patch 15-17, then it could be still merged now:
  Release-Acked-by: Oleksii Kurochko<oleksii.kurochko@gmail.com>

>
> https://gitlab.com/xen-project/hardware/xen-staging/-/pipelines/2079705485

Btw, is it expected that some tests failed?

Thanks.

~ Oleksii

>
> Andrew Cooper (22):
>    x86/msr: Change rdmsr() to have normal API
>    x86/msr: Change wrmsr() to take a single parameter
>    x86/fsgsbase: Split out __{rd,wr}gs_shadow() helpers
>    x86/fsgsbase: Update fs/gs helpers to use wrmsrns()
>    x86/fsgsbase: Improve code generation in read_registers()
>    x86/boot: Use RSTORSSP to establish SSP
>    x86/traps: Alter switch_stack_and_jump() for FRED mode
>    x86/traps: Skip Supervisor Shadow Stack tokens in FRED mode
>    x86/traps: Make an IDT-specific #DB helper
>    x86/traps: Make an IDT-specific #PF helper
>    x86/fsgsbase: Make gskern accesses safe under FRED
>    x86/traps: Introduce FRED entrypoints
>    x86/traps: Enable FRED when requested
>    x86/pv: Deduplicate is_canonical_address() in do_set_segment_base()
>    x86/entry: Alter how IRET faults are recognised
>    x86/entry: Drop the pre exception table infrastructure
>    x86/entry: Rework the comment about SYSCALL and DF
>    x86/pv: Adjust GS handling for FRED mode
>    x86/pv: Guest exception handling in FRED mode
>    x86/pv: ERETU error handling
>    x86/pv: System call handling in FRED mode
>    x86: Clamp reserved bits in eflags more aggressively
>
>   xen/arch/x86/acpi/cpufreq/powernow.c    |  12 +-
>   xen/arch/x86/boot/x86_64.S              |  23 +-
>   xen/arch/x86/cpu/amd.c                  |   8 +-
>   xen/arch/x86/cpu/common.c               |  20 +-
>   xen/arch/x86/cpu/intel.c                |  30 +-
>   xen/arch/x86/domain.c                   |  34 +-
>   xen/arch/x86/extable.c                  |  14 -
>   xen/arch/x86/genapic/x2apic.c           |   5 +-
>   xen/arch/x86/hvm/domain.c               |   4 +-
>   xen/arch/x86/hvm/vmx/vmcs.c             |  32 +-
>   xen/arch/x86/hvm/vmx/vmx.c              |   4 +-
>   xen/arch/x86/include/asm/asm_defns.h    |  76 +++-
>   xen/arch/x86/include/asm/current.h      |   9 +-
>   xen/arch/x86/include/asm/domain.h       |   2 +
>   xen/arch/x86/include/asm/fsgsbase.h     |  66 +--
>   xen/arch/x86/include/asm/hypercall.h    |   2 -
>   xen/arch/x86/include/asm/msr.h          |  48 ++-
>   xen/arch/x86/include/asm/prot-key.h     |   6 +-
>   xen/arch/x86/include/asm/traps.h        |   2 +
>   xen/arch/x86/include/asm/uaccess.h      |   2 -
>   xen/arch/x86/include/asm/x86-defns.h    |   7 +
>   xen/arch/x86/mm.c                       |  12 +-
>   xen/arch/x86/nmi.c                      |  18 +-
>   xen/arch/x86/oprofile/op_model_athlon.c |   2 +-
>   xen/arch/x86/pv/dom0_build.c            |   2 +-
>   xen/arch/x86/pv/domain.c                |  22 +-
>   xen/arch/x86/pv/iret.c                  |   8 +-
>   xen/arch/x86/pv/misc-hypercalls.c       |  42 +-
>   xen/arch/x86/pv/traps.c                 |  39 ++
>   xen/arch/x86/setup.c                    |  33 +-
>   xen/arch/x86/traps-setup.c              |  83 +++-
>   xen/arch/x86/traps.c                    | 519 ++++++++++++++++++++++--
>   xen/arch/x86/tsx.c                      |  27 +-
>   xen/arch/x86/x86_64/Makefile            |   1 +
>   xen/arch/x86/x86_64/compat/entry.S      |   3 +-
>   xen/arch/x86/x86_64/entry-fred.S        |  57 +++
>   xen/arch/x86/x86_64/entry.S             |  46 ++-
>   xen/arch/x86/xen.lds.S                  |   5 -
>   38 files changed, 1076 insertions(+), 249 deletions(-)
>   create mode 100644 xen/arch/x86/x86_64/entry-fred.S
>

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