[PATCH v2 0/4] KVM: arm64: Fix guest feature sanitization and pKVM state synchronization

[Fuad Tabba <tabba@google.com>]

This series addresses state management and feature synchronization
vulnerabilities in both standard KVM and pKVM implementations on arm64.
The primary focus is ensuring that the hypervisor correctly handles
architectural extensions during context switches to prevent state
corruption.

Changes since v1 [1]:
- Moved optimising away S1POE handling when not supported by host to a
  separate patch.
- Fixed clearing, checking and setting KVM_ARCH_FLAG_ID_REGS_INITIALIZED

[1] https://lore.kernel.org/all/20260212090252.158689-1-tabba@google.com/

Based on Linux 6.19.

Cheers,
/fuad

Cc: stable@vger.kernel.org

Fuad Tabba (4):
  KVM: arm64: Hide S1POE from guests when not supported by the host
  KVM: arm64: Optimise away S1POE handling when not supported by host
  KVM: arm64: Fix ID register initialization for non-protected pKVM
    guests
  KVM: arm64: Remove redundant kern_hyp_va() in unpin_host_sve_state()

 arch/arm64/include/asm/kvm_host.h |  3 ++-
 arch/arm64/kvm/hyp/nvhe/pkvm.c    | 37 ++++++++++++++++++++++++++++---
 arch/arm64/kvm/sys_regs.c         |  3 +++
 3 files changed, 39 insertions(+), 4 deletions(-)


base-commit: 05f7e89ab9731565d8a62e3b5d1ec206485eeb0b
-- 
2.53.0.273.g2a3d683680-goog