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[v2,00/16] KVM: arm64: Add EL2 support to FEAT_S1PIE

Message ID 20240903153834.1909472-1-maz@kernel.org (mailing list archive)
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Series KVM: arm64: Add EL2 support to FEAT_S1PIE | expand

Message

Marc Zyngier Sept. 3, 2024, 3:38 p.m. UTC 
This series serves a few purposes:

- Complete the S1PIE support to include EL2
- Sneak in the EL2 system register world switch

As mentioned in few of the patches, this implementation relies on a
very recent fix to the architecture (D22677 in [0]).

This series has seen a few changes since the initial posting [1]:

- Rebased on top of the AT support branch, which is currently sitting
  in kvmarm/next

- Add handling for S1 indirect permission in AT, which I'm sure will
  give Alexandru another king-sized headache

- Picked Mark Brown's series [2] dealing with TCRX and S1PIE
  visibility, and slapped an extra fix on top for good measure

- Picked up RBs from Joey, with thanks.

[0] https://developer.arm.com/documentation/102105/ka-04/
[1] https://lore.kernel.org/r/20240813144738.2048302-1-maz@kernel.org
[2] https://lore.kernel.org/r/20240822-kvm-arm64-hide-pie-regs-v2-0-376624fa829c@kernel.org

Marc Zyngier (13):
  KVM: arm64: nv: Handle CNTHCTL_EL2 specially
  KVM: arm64: nv: Save/Restore vEL2 sysregs
  KVM: arm64: Add TCR2_EL2 to the sysreg arrays
  KVM: arm64: Add save/restore for TCR2_EL2
  arm64: Add encoding for PIRE0_EL2
  arm64: Remove VNCR definition for PIRE0_EL2
  KVM: arm64: Add PIR{,E0}_EL2 to the sysreg arrays
  KVM: arm64: Add save/restore for PIR{,E0}_EL2
  KVM: arm64: Handle  PIR{,E0}_EL2 traps
  KVM: arm64: Sanitise ID_AA64MMFR3_EL1
  KVM: arm64: Split S1 permission evaluation into direct and
    hierarchical parts
  KVM: arm64: Implement AT S1PIE support
  KVM: arm64: Rely on visibility to let PIR*_ELx/TCR2_ELx UNDEF

Mark Brown (3):
  KVM: arm64: Define helper for EL2 registers with custom visibility
  KVM: arm64: Hide TCR2_EL1 from userspace when disabled for guests
  KVM: arm64: Hide S1PIE registers from userspace when disabled for
    guests

 arch/arm64/include/asm/kvm_host.h          |   9 +
 arch/arm64/include/asm/vncr_mapping.h      |   1 -
 arch/arm64/kvm/at.c                        | 296 ++++++++++++++++-----
 arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h |   5 +-
 arch/arm64/kvm/hyp/nvhe/sysreg-sr.c        |   2 +-
 arch/arm64/kvm/hyp/vhe/sysreg-sr.c         | 155 ++++++++++-
 arch/arm64/kvm/sys_regs.c                  | 114 +++++++-
 arch/arm64/tools/sysreg                    |   4 +
 include/kvm/arm_arch_timer.h               |   3 +
 9 files changed, 505 insertions(+), 84 deletions(-)