[GIT PULL] KVM/arm64 fixes for 6.14, take #2

[GIT PULL] KVM/arm64 fixes for 6.14, take #2

[Marc Zyngier]

Paolo,

Here's the second batch of KVM/arm64 fixes for 6.14.

The most noticeable item here is a rather large rework of our
FP/SIMD/SVE/SME handling, mostly removing a bunch of fairly pointless
and not-quite-thought-out optimisations. This fixes a bunch of
failures reported in the wild, and makes the code far more
maintainable. Thanks to Mark Rutland for doing all the hard work.

The rest is mostly a bunch of fixes cleanups after the merge window
(timers, vgic, pKVM...).

Please pull,

	M.

The following changes since commit 0e459810285503fb354537e84049e212c5917c33:

  KVM: arm64: timer: Don't adjust the EL2 virtual timer offset (2025-02-04 15:10:38 +0000)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git tags/kvmarm-fixes-6.14-2

for you to fetch changes up to b3aa9283c0c505b5cfd25f7d6cfd720de2adc807:

  KVM: arm64: vgic: Hoist SGI/PPI alloc from vgic_init() to kvm_create_vgic() (2025-02-13 18:03:54 +0000)

----------------------------------------------------------------
KVM/arm64 fixes for 6.14, take #2

- Large set of fixes for vector handling, specially in the interactions
  between host and guest state. This fixes a number of bugs affecting
  actual deployments, and greatly simplifies the FP/SIMD/SVE handling.
  Thanks to Mark Rutland for dealing with this thankless task.

- Fix an ugly race between vcpu and vgic creation/init, resulting in
  unexpected behaviours.

- Fix use of kernel VAs at EL2 when emulating timers with nVHE.

- Small set of pKVM improvements and cleanups.

----------------------------------------------------------------
Marc Zyngier (4):
      KVM: arm64: Fix __pkvm_host_mkyoung_guest() return value
      KVM: arm64: Convert timer offset VA when accessed in HYP code
      KVM: arm64: timer: Drop warning on failed interrupt signalling
      KVM: arm64: vgic: Hoist SGI/PPI alloc from vgic_init() to kvm_create_vgic()

Mark Rutland (9):
      KVM: arm64: Unconditionally save+flush host FPSIMD/SVE/SME state
      KVM: arm64: Remove host FPSIMD saving for non-protected KVM
      KVM: arm64: Remove VHE host restore of CPACR_EL1.ZEN
      KVM: arm64: Remove VHE host restore of CPACR_EL1.SMEN
      KVM: arm64: Refactor CPTR trap deactivation
      KVM: arm64: Refactor exit handlers
      KVM: arm64: Mark some header functions as inline
      KVM: arm64: Eagerly switch ZCR_EL{1,2}
      KVM: arm64: Simplify warning in kvm_arch_vcpu_load_fp()

Quentin Perret (3):
      KVM: arm64: Improve error handling from check_host_shared_guest()
      KVM: arm64: Simplify np-guest hypercalls
      KVM: arm64: Fix alignment of kvm_hyp_memcache allocations

 arch/arm64/include/asm/kvm_emulate.h    |  42 ---------
 arch/arm64/include/asm/kvm_host.h       |  24 ++----
 arch/arm64/kernel/fpsimd.c              |  25 ------
 arch/arm64/kvm/arch_timer.c             |  16 ++--
 arch/arm64/kvm/arm.c                    |   8 --
 arch/arm64/kvm/fpsimd.c                 | 107 ++---------------------
 arch/arm64/kvm/hyp/entry.S              |   5 ++
 arch/arm64/kvm/hyp/include/hyp/switch.h | 148 ++++++++++++++++++++++++--------
 arch/arm64/kvm/hyp/nvhe/hyp-main.c      |  15 ++--
 arch/arm64/kvm/hyp/nvhe/mem_protect.c   |  76 ++++++++--------
 arch/arm64/kvm/hyp/nvhe/switch.c        |  89 +++++++++----------
 arch/arm64/kvm/hyp/vhe/switch.c         |  33 ++++---
 arch/arm64/kvm/vgic/vgic-init.c         |  74 ++++++++--------
 13 files changed, 287 insertions(+), 375 deletions(-)

Re: [GIT PULL] KVM/arm64 fixes for 6.14, take #2

[Paolo Bonzini]

On Fri, Feb 14, 2025 at 12:56 PM Marc Zyngier <maz@kernel.org> wrote:
>
> Paolo,
>
> Here's the second batch of KVM/arm64 fixes for 6.14.
>
> The most noticeable item here is a rather large rework of our
> FP/SIMD/SVE/SME handling, mostly removing a bunch of fairly pointless
> and not-quite-thought-out optimisations. This fixes a bunch of
> failures reported in the wild, and makes the code far more
> maintainable. Thanks to Mark Rutland for doing all the hard work.
>
> The rest is mostly a bunch of fixes cleanups after the merge window
> (timers, vgic, pKVM...).
>
> Please pull,

>
> The following changes since commit 0e459810285503fb354537e84049e212c5917c33:
>
>   KVM: arm64: timer: Don't adjust the EL2 virtual timer offset (2025-02-04 15:10:38 +0000)
>
> are available in the Git repository at:
>
>   git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git tags/kvmarm-fixes-6.14-2
>
> for you to fetch changes up to b3aa9283c0c505b5cfd25f7d6cfd720de2adc807:
>
>   KVM: arm64: vgic: Hoist SGI/PPI alloc from vgic_init() to kvm_create_vgic() (2025-02-13 18:03:54 +0000)
>
> ----------------------------------------------------------------
> KVM/arm64 fixes for 6.14, take #2
>
> - Large set of fixes for vector handling, specially in the interactions
>   between host and guest state. This fixes a number of bugs affecting
>   actual deployments, and greatly simplifies the FP/SIMD/SVE handling.
>   Thanks to Mark Rutland for dealing with this thankless task.
>
> - Fix an ugly race between vcpu and vgic creation/init, resulting in
>   unexpected behaviours.
>
> - Fix use of kernel VAs at EL2 when emulating timers with nVHE.
>
> - Small set of pKVM improvements and cleanups.

Done, thanks,

Paolo