[PATCH v2 0/4] KVM: arm64: Live system register access fixes

[Marc Zyngier <maz@kernel.org>]

This series stems from [1], which outlined some rather bad bugs in the
way we handle live system registers with VHE. As the discussion
progressed, I decided to tighten things a bit, and found a couple more
bugs in the process.

I appreciate this is a bit big for a -rc, but at the same time some of
the issues are rather annoying, and I'd like to make sure we address
these for good.

[1] https://lore.kernel.org/all/20250809144811.2314038-3-maz@kernel.org/

Marc Zyngier (4):
  KVM: arm64: Check for SYSREGS_ON_CPU before accessing the 32bit state
  KVM: arm64: Simplify sysreg access on exception delivery
  KVM: arm64: Fix vcpu_{read,write}_sys_reg() accessors
  KVM: arm64: Remove __vcpu_{read,write}_sys_reg_{from,to}_cpu()

 arch/arm64/include/asm/kvm_host.h | 111 +---------
 arch/arm64/kvm/hyp/exception.c    |  20 +-
 arch/arm64/kvm/sys_regs.c         | 344 ++++++++++++++++++++----------
 3 files changed, 243 insertions(+), 232 deletions(-)

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2.39.2