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]).
* From v2 [2]:
- Correctly reprogram the context for AT in the fast path when S1PIE
is in use
- Generalised sysreg RES0/RES1 masking, and added TCR2_EL2 RES0/RES1
bit handling
- Fix TCR2_EL1, PIR_EL1, PIRE0_EL1 access with VHE
- Add a bunch of missing registers to get_el2_to_el1_mapping()
- Correctly map {TCR2,PIR,PIRE0}_EL2 to their EL1 equivalent on NV
- Disable hierarchical permissions when S1PIE is enabled
- Make EL2 world switch directly act on the vcpu rather than an
arbitrary context
- Remove SKL{0,1} from the TCR2_EL2 description
* From 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 [3] 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@xxxxxxxxxx
[2] https://lore.kernel.org/r/20240903153834.1909472-1-maz@xxxxxxxxxx
[3] https://lore.kernel.org/r/20240822-kvm-arm64-hide-pie-regs-v2-0-376624fa829c@xxxxxxxxxx
Marc Zyngier (21):
arm64: Drop SKL0/SKL1 from TCR2_EL2
arm64: Remove VNCR definition for PIRE0_EL2
arm64: Add encoding for PIRE0_EL2
KVM: arm64: nv: Add missing EL2->EL1 mappings in
get_el2_to_el1_mapping()
KVM: arm64: nv: Handle CNTHCTL_EL2 specially
KVM: arm64: nv: Save/Restore vEL2 sysregs
KVM: arm64: Correctly access TCR2_EL1, PIR_EL1, PIRE0_EL1 with VHE
KVM: arm64: Extend masking facility to arbitrary registers
arm64: Define ID_AA64MMFR1_EL1.HAFDBS advertising FEAT_HAFT
KVM: arm64: Add TCR2_EL2 to the sysreg arrays
KVM: arm64: Sanitise TCR2_EL2
KVM: arm64: Add save/restore for TCR2_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: Add AT fast-path support for S1PIE
KVM: arm64: Split S1 permission evaluation into direct and
hierarchical parts
KVM: arm64: Disable hierarchical permissions when S1PIE is enabled
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 | 34 ++-
arch/arm64/include/asm/vncr_mapping.h | 1 -
arch/arm64/kvm/at.c | 322 +++++++++++++++++----
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/nested.c | 34 ++-
arch/arm64/kvm/sys_regs.c | 129 ++++++++-
arch/arm64/tools/sysreg | 8 +-
include/kvm/arm_arch_timer.h | 3 +
10 files changed, 597 insertions(+), 96 deletions(-)
--
2.39.2
