linux-kernel - [PATCH 5.15 v2 00/10] KVM: arm64: Backport of SVE fixes to v5.15

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Message-Id: <20250403-stable-sve-5-15-v2-0-30a36a78a20a@kernel.org>
Date: Thu, 03 Apr 2025 00:20:15 +0100
From: Mark Brown <broonie@...nel.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Marc Zyngier <maz@...nel.org>, James Morse <james.morse@....com>, 
 Suzuki K Poulose <suzuki.poulose@....com>, 
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
 Oleg Nesterov <oleg@...hat.com>, Oliver Upton <oliver.upton@...ux.dev>
Cc: linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu, 
 linux-kernel@...r.kernel.org, stable@...r.kernel.org, 
 Mark Brown <broonie@...nel.org>, Mark Rutland <mark.rutland@....com>, 
 Eric Auger <eauger@...hat.com>, Wilco Dijkstra <wilco.dijkstra@....com>, 
 Eric Auger <eric.auger@...hat.com>, Florian Weimer <fweimer@...hat.com>, 
 Fuad Tabba <tabba@...gle.com>, Jeremy Linton <jeremy.linton@....com>, 
 Paolo Bonzini <pbonzini@...hat.com>, James Clark <james.clark@...aro.org>
Subject: [PATCH 5.15 v2 00/10] KVM: arm64: Backport of SVE fixes to v5.15

This series backports some recent fixes for SVE/KVM interactions from
Mark Rutland to v5.15.

Signed-off-by: Mark Brown <broonie@...nel.org>
---
Changes in v2:
- Resend with Greg and the stable list added.
- Link to v1: https://lore.kernel.org/r/20250402-stable-sve-5-15-v1-0-84d0e5ff1102@kernel.org

---
Fuad Tabba (1):
      KVM: arm64: Calculate cptr_el2 traps on activating traps

Marc Zyngier (1):
      KVM: arm64: Get rid of host SVE tracking/saving

Mark Brown (4):
      KVM: arm64: Discard any SVE state when entering KVM guests
      arm64/fpsimd: Track the saved FPSIMD state type separately to TIF_SVE
      arm64/fpsimd: Have KVM explicitly say which FP registers to save
      arm64/fpsimd: Stop using TIF_SVE to manage register saving in KVM

Mark Rutland (4):
      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: Eagerly switch ZCR_EL{1,2}

 arch/arm64/include/asm/fpsimd.h         |   4 +-
 arch/arm64/include/asm/kvm_host.h       |  17 +++--
 arch/arm64/include/asm/kvm_hyp.h        |   7 ++
 arch/arm64/include/asm/processor.h      |   7 ++
 arch/arm64/kernel/fpsimd.c              | 117 +++++++++++++++++++++++---------
 arch/arm64/kernel/process.c             |   3 +
 arch/arm64/kernel/ptrace.c              |   3 +
 arch/arm64/kernel/signal.c              |   3 +
 arch/arm64/kvm/arm.c                    |   1 -
 arch/arm64/kvm/fpsimd.c                 |  72 +++++++++-----------
 arch/arm64/kvm/hyp/entry.S              |   5 ++
 arch/arm64/kvm/hyp/include/hyp/switch.h |  86 +++++++++++++++--------
 arch/arm64/kvm/hyp/nvhe/hyp-main.c      |   9 ++-
 arch/arm64/kvm/hyp/nvhe/switch.c        |  52 +++++++++-----
 arch/arm64/kvm/hyp/vhe/switch.c         |   4 ++
 arch/arm64/kvm/reset.c                  |   3 +
 16 files changed, 266 insertions(+), 127 deletions(-)
---
base-commit: 0c935c049b5c196b83b968c72d348ae6fff83ea2
change-id: 20250326-stable-sve-5-15-bfd75482dcfa

Best regards,
-- 
Mark Brown <broonie@...nel.org>