[PATCH 4/4] KVM: arm64: Honor trap routing for TCR2_EL1

Marc Zyngier
2024-06-25T13:00:49Z

TCR2_EL1 handling is missing the handling of its trap configuration:

- HCRX_EL2.TCR2En must be handled in conjunction with HCR_EL2.{TVM,TRVM}

- HFG{R,W}TR_EL2.TCR_EL1 does apply to TCR2_EL1 as well

Without these two controls being implemented, it is impossible to
correctly route TCR2_EL1 traps.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
arch/arm64/kvm/emulate-nested.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/arch/arm64/kvm/emulate-nested.c b/arch/arm64/kvm/emulate-nested.c
index 54090967a3356..2fa2d5fc37d60 100644
--- a/arch/arm64/kvm/emulate-nested.c
+++ b/arch/arm64/kvm/emulate-nested.c
@@ -79,6 +79,8 @@ enum cgt_group_id {
CGT_MDCR_E2TB,
CGT_MDCR_TDCC,

+ CGT_HCRX_TCR2En,
+
/*
* Anything after this point is a combination of coarse trap
* controls, which must all be evaluated to decide what to do.
@@ -89,6 +91,7 @@ enum cgt_group_id {
CGT_HCR_TTLB_TTLBIS,
CGT_HCR_TTLB_TTLBOS,
CGT_HCR_TVM_TRVM,
+ CGT_HCR_TVM_TRVM_HCRX_TCR2En,
CGT_HCR_TPU_TICAB,
CGT_HCR_TPU_TOCU,
CGT_HCR_NV1_nNV2_ENSCXT,
@@ -345,6 +348,12 @@ static const struct trap_bits coarse_trap_bits[] = {
.mask = MDCR_EL2_TDCC,
.behaviour = BEHAVE_FORWARD_ANY,
},
+ [CGT_HCRX_TCR2En] = {
+ .index = HCRX_EL2,
+ .value = 0,
+ .mask = HCRX_EL2_TCR2En,
+ .behaviour = BEHAVE_FORWARD_ANY,
+ },
};

#define MCB(id, ...) \
@@ -359,6 +368,8 @@ static const enum cgt_group_id *coarse_control_combo[] = {
MCB(CGT_HCR_TTLB_TTLBIS, CGT_HCR_TTLB, CGT_HCR_TTLBIS),
MCB(CGT_HCR_TTLB_TTLBOS, CGT_HCR_TTLB, CGT_HCR_TTLBOS),
MCB(CGT_HCR_TVM_TRVM, CGT_HCR_TVM, CGT_HCR_TRVM),
+ MCB(CGT_HCR_TVM_TRVM_HCRX_TCR2En,
+ CGT_HCR_TVM, CGT_HCR_TRVM, CGT_HCRX_TCR2En),
MCB(CGT_HCR_TPU_TICAB, CGT_HCR_TPU, CGT_HCR_TICAB),
MCB(CGT_HCR_TPU_TOCU, CGT_HCR_TPU, CGT_HCR_TOCU),
MCB(CGT_HCR_NV1_nNV2_ENSCXT, CGT_HCR_NV1_nNV2, CGT_HCR_ENSCXT),
@@ -622,6 +633,7 @@ static const struct encoding_to_trap_config encoding_to_cgt[] __initconst = {
SR_TRAP(SYS_MAIR_EL1, CGT_HCR_TVM_TRVM),
SR_TRAP(SYS_AMAIR_EL1, CGT_HCR_TVM_TRVM),
SR_TRAP(SYS_CONTEXTIDR_EL1, CGT_HCR_TVM_TRVM),
+ SR_TRAP(SYS_TCR2_EL1, CGT_HCR_TVM_TRVM_HCRX_TCR2En),
SR_TRAP(SYS_DC_ZVA, CGT_HCR_TDZ),
SR_TRAP(SYS_DC_GVA, CGT_HCR_TDZ),
SR_TRAP(SYS_DC_GZVA, CGT_HCR_TDZ),
@@ -1071,6 +1083,7 @@ static const struct encoding_to_trap_config encoding_to_fgt[] __initconst = {
SR_FGT(SYS_TPIDRRO_EL0, HFGxTR, TPIDRRO_EL0, 1),
SR_FGT(SYS_TPIDR_EL1, HFGxTR, TPIDR_EL1, 1),
SR_FGT(SYS_TCR_EL1, HFGxTR, TCR_EL1, 1),
+ SR_FGT(SYS_TCR2_EL1, HFGxTR, TCR_EL1, 1),
SR_FGT(SYS_SCXTNUM_EL0, HFGxTR, SCXTNUM_EL0, 1),
SR_FGT(SYS_SCXTNUM_EL1, HFGxTR, SCXTNUM_EL1, 1),
SR_FGT(SYS_SCTLR_EL1, HFGxTR, SCTLR_EL1, 1),
--
2.39.2