[PATCH v2 0/2] arm64/sme: Fix SMPRI_EL1 traps for KVM guests

[Mark Brown]

When adding support for SME I missed management of traps for SMPRI_EL1
in KVM guests, and also the need to manage TPIDR2_EL0 fine grained traps
for EL1.  This series adds that management, and also updates the
documentation to help avoid such issues in future.

This was noticed due to Vincent Donnefort noticing that qemu has
implemented support for SME virtualisation but not fine grained traps
which was causing problems for qemu in nVHE mode since that already used
fine grained traps with SME, the FGT registers are not implemented and
UNDEF.  As a result of this change VHE will also be affected so a
separate series "KVM: arm: Refuse to enable KVM on systems with SME but
not FGT" has been sent which will ensure we don't run on such systems
though initial review suggests that this will likely be treated as a
qemu documentation issue.

v2:
 - Rebase onto v6.1-rc2
 - Also manage TPIDR2 fine grained traps for VHE mode.

Mark Brown (2):
  arm64: booting: Document our requirements for fine grained traps with
    SME
  KVM: arm64: Trap access to SMPRI_EL1 and TPIDR2 in VHE mode

 Documentation/arm64/booting.rst |  8 ++++++++
 arch/arm64/kvm/hyp/vhe/switch.c | 26 ++++++++++++++++++++++++--
 2 files changed, 32 insertions(+), 2 deletions(-)


base-commit: 30a0b95b1335e12efef89dd78518ed3e4a71a763
-- 
2.30.2