diff mbox series

[18/18] KVM: arm64: Use FGT feature maps to drive RES0 bits

Message ID 20250210184150.2145093-19-maz@kernel.org (mailing list archive)
State New
Headers show
Series KVM: arm64: Revamp Fine Grained Trap handling | expand

Commit Message

Marc Zyngier Feb. 10, 2025, 6:41 p.m. UTC 
Another benefit of mapping bits to features is that it becomes trivial
to define which bits should be handled as RES0.

Let's apply this principle to the guest's view of the FGT registers.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/include/asm/kvm_host.h |   1 +
 arch/arm64/kvm/config.c           |  26 +++++++
 arch/arm64/kvm/nested.c           | 125 +++---------------------------
 3 files changed, 37 insertions(+), 115 deletions(-)
diff mbox series

Patch

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index b537adc5c5557..663b16750fdb6 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -1577,6 +1577,7 @@  void kvm_set_vm_id_reg(struct kvm *kvm, u32 reg, u64 val);
 	(kvm_has_feat((k), ID_AA64MMFR3_EL1, S1POE, IMP))
 
 void compute_fgu(struct kvm *kvm, enum fgt_group_id fgt);
+u64 get_reg_disabled_bits(struct kvm *kvm, enum vcpu_sysreg reg);
 void check_feature_map(void);
 
 #endif /* __ARM64_KVM_HOST_H__ */
diff --git a/arch/arm64/kvm/config.c b/arch/arm64/kvm/config.c
index c9dff71006bf4..5034947eee349 100644
--- a/arch/arm64/kvm/config.c
+++ b/arch/arm64/kvm/config.c
@@ -586,3 +586,29 @@  void compute_fgu(struct kvm *kvm, enum fgt_group_id fgt)
 
 	kvm->arch.fgu[fgt] = val;
 }
+
+u64 get_reg_disabled_bits(struct kvm *kvm, enum vcpu_sysreg reg)
+{
+	switch (reg) {
+	case HFGRTR_EL2:
+		return  __compute_unsupported_bits(kvm, hfgrtr_feat_map,
+						   ARRAY_SIZE(hfgrtr_feat_map), 0);
+	case HFGWTR_EL2:
+		return  __compute_unsupported_bits(kvm, hfgwtr_feat_map,
+						   ARRAY_SIZE(hfgwtr_feat_map), 0);
+	case HFGITR_EL2:
+		return  __compute_unsupported_bits(kvm, hfgitr_feat_map,
+						   ARRAY_SIZE(hfgitr_feat_map), 0);
+	case HDFGRTR_EL2:
+		return  __compute_unsupported_bits(kvm, hdfgrtr_feat_map,
+						   ARRAY_SIZE(hdfgrtr_feat_map), 0);
+	case HDFGWTR_EL2:
+		return  __compute_unsupported_bits(kvm, hdfgwtr_feat_map,
+						   ARRAY_SIZE(hdfgwtr_feat_map), 0);
+	case HAFGRTR_EL2:
+		return  __compute_unsupported_bits(kvm, hafgrtr_feat_map,
+						   ARRAY_SIZE(hafgrtr_feat_map), 0);
+	default:
+		return 0;
+	}
+}
diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c
index 48b8a700de457..b9132b39e146d 100644
--- a/arch/arm64/kvm/nested.c
+++ b/arch/arm64/kvm/nested.c
@@ -1081,133 +1081,28 @@  int kvm_init_nv_sysregs(struct kvm_vcpu *vcpu)
 	set_sysreg_masks(kvm, HCRX_EL2, res0, res1);
 
 	/* HFG[RW]TR_EL2 */
-	res0 = res1 = 0;
-	if (!(kvm_vcpu_has_feature(kvm, KVM_ARM_VCPU_PTRAUTH_ADDRESS) &&
-	      kvm_vcpu_has_feature(kvm, KVM_ARM_VCPU_PTRAUTH_GENERIC)))
-		res0 |= (HFGxTR_EL2_APDAKey | HFGxTR_EL2_APDBKey |
-			 HFGxTR_EL2_APGAKey | HFGxTR_EL2_APIAKey |
-			 HFGxTR_EL2_APIBKey);
-	if (!kvm_has_feat(kvm, ID_AA64MMFR1_EL1, LO, IMP))
-		res0 |= (HFGxTR_EL2_LORC_EL1 | HFGxTR_EL2_LOREA_EL1 |
-			 HFGxTR_EL2_LORID_EL1 | HFGxTR_EL2_LORN_EL1 |
-			 HFGxTR_EL2_LORSA_EL1);
-	if (!kvm_has_feat(kvm, ID_AA64PFR0_EL1, CSV2, CSV2_2) &&
-	    !kvm_has_feat(kvm, ID_AA64PFR1_EL1, CSV2_frac, CSV2_1p2))
-		res0 |= (HFGxTR_EL2_SCXTNUM_EL1 | HFGxTR_EL2_SCXTNUM_EL0);
-	if (!kvm_has_feat(kvm, ID_AA64PFR0_EL1, GIC, IMP))
-		res0 |= HFGxTR_EL2_ICC_IGRPENn_EL1;
-	if (!kvm_has_feat(kvm, ID_AA64PFR0_EL1, RAS, IMP))
-		res0 |= (HFGxTR_EL2_ERRIDR_EL1 | HFGxTR_EL2_ERRSELR_EL1 |
-			 HFGxTR_EL2_ERXFR_EL1 | HFGxTR_EL2_ERXCTLR_EL1 |
-			 HFGxTR_EL2_ERXSTATUS_EL1 | HFGxTR_EL2_ERXMISCn_EL1 |
-			 HFGxTR_EL2_ERXPFGF_EL1 | HFGxTR_EL2_ERXPFGCTL_EL1 |
-			 HFGxTR_EL2_ERXPFGCDN_EL1 | HFGxTR_EL2_ERXADDR_EL1);
-	if (!kvm_has_feat(kvm, ID_AA64ISAR1_EL1, LS64, LS64_ACCDATA))
-		res0 |= HFGxTR_EL2_nACCDATA_EL1;
-	if (!kvm_has_feat(kvm, ID_AA64PFR1_EL1, GCS, IMP))
-		res0 |= (HFGxTR_EL2_nGCS_EL0 | HFGxTR_EL2_nGCS_EL1);
-	if (!kvm_has_feat(kvm, ID_AA64PFR1_EL1, SME, IMP))
-		res0 |= (HFGxTR_EL2_nSMPRI_EL1 | HFGxTR_EL2_nTPIDR2_EL0);
-	if (!kvm_has_feat(kvm, ID_AA64PFR1_EL1, THE, IMP))
-		res0 |= HFGxTR_EL2_nRCWMASK_EL1;
-	if (!kvm_has_s1pie(kvm))
-		res0 |= (HFGxTR_EL2_nPIRE0_EL1 | HFGxTR_EL2_nPIR_EL1);
-	if (!kvm_has_s1poe(kvm))
-		res0 |= (HFGxTR_EL2_nPOR_EL0 | HFGxTR_EL2_nPOR_EL1);
-	if (!kvm_has_feat(kvm, ID_AA64MMFR3_EL1, S2POE, IMP))
-		res0 |= HFGxTR_EL2_nS2POR_EL1;
-	if (!kvm_has_feat(kvm, ID_AA64MMFR3_EL1, AIE, IMP))
-		res0 |= (HFGxTR_EL2_nMAIR2_EL1 | HFGxTR_EL2_nAMAIR2_EL1);
+	res1 = 0;
+	res0 = get_reg_disabled_bits(kvm, HFGRTR_EL2);
 	set_sysreg_masks(kvm, HFGRTR_EL2, res0 | hfgrtr_masks.res0, res1);
+	res0 = get_reg_disabled_bits(kvm, HFGWTR_EL2);
 	set_sysreg_masks(kvm, HFGWTR_EL2, res0 | hfgwtr_masks.res0, res1);
 
 	/* HDFG[RW]TR_EL2 */
-	res0 = res1 = 0;
-	if (!kvm_has_feat(kvm, ID_AA64DFR0_EL1, DoubleLock, IMP))
-		res0 |= HDFGRTR_EL2_OSDLR_EL1;
-	if (!kvm_has_feat(kvm, ID_AA64DFR0_EL1, PMUVer, IMP))
-		res0 |= (HDFGRTR_EL2_PMEVCNTRn_EL0 | HDFGRTR_EL2_PMEVTYPERn_EL0 |
-			 HDFGRTR_EL2_PMCCFILTR_EL0 | HDFGRTR_EL2_PMCCNTR_EL0 |
-			 HDFGRTR_EL2_PMCNTEN | HDFGRTR_EL2_PMINTEN |
-			 HDFGRTR_EL2_PMOVS | HDFGRTR_EL2_PMSELR_EL0 |
-			 HDFGRTR_EL2_PMMIR_EL1 | HDFGRTR_EL2_PMUSERENR_EL0 |
-			 HDFGRTR_EL2_PMCEIDn_EL0);
-	if (!kvm_has_feat(kvm, ID_AA64DFR0_EL1, PMSVer, IMP))
-		res0 |= (HDFGRTR_EL2_PMBLIMITR_EL1 | HDFGRTR_EL2_PMBPTR_EL1 |
-			 HDFGRTR_EL2_PMBSR_EL1 | HDFGRTR_EL2_PMSCR_EL1 |
-			 HDFGRTR_EL2_PMSEVFR_EL1 | HDFGRTR_EL2_PMSFCR_EL1 |
-			 HDFGRTR_EL2_PMSICR_EL1 | HDFGRTR_EL2_PMSIDR_EL1 |
-			 HDFGRTR_EL2_PMSIRR_EL1 | HDFGRTR_EL2_PMSLATFR_EL1 |
-			 HDFGRTR_EL2_PMBIDR_EL1);
-	if (!kvm_has_feat(kvm, ID_AA64DFR0_EL1, TraceVer, IMP))
-		res0 |= (HDFGRTR_EL2_TRC | HDFGRTR_EL2_TRCAUTHSTATUS |
-			 HDFGRTR_EL2_TRCAUXCTLR | HDFGRTR_EL2_TRCCLAIM |
-			 HDFGRTR_EL2_TRCCNTVRn | HDFGRTR_EL2_TRCID |
-			 HDFGRTR_EL2_TRCIMSPECn | HDFGRTR_EL2_TRCOSLSR |
-			 HDFGRTR_EL2_TRCPRGCTLR | HDFGRTR_EL2_TRCSEQSTR |
-			 HDFGRTR_EL2_TRCSSCSRn | HDFGRTR_EL2_TRCSTATR |
-			 HDFGRTR_EL2_TRCVICTLR);
-	if (!kvm_has_feat(kvm, ID_AA64DFR0_EL1, TraceBuffer, IMP))
-		res0 |= (HDFGRTR_EL2_TRBBASER_EL1 | HDFGRTR_EL2_TRBIDR_EL1 |
-			 HDFGRTR_EL2_TRBLIMITR_EL1 | HDFGRTR_EL2_TRBMAR_EL1 |
-			 HDFGRTR_EL2_TRBPTR_EL1 | HDFGRTR_EL2_TRBSR_EL1 |
-			 HDFGRTR_EL2_TRBTRG_EL1);
-	if (!kvm_has_feat(kvm, ID_AA64DFR0_EL1, BRBE, IMP))
-		res0 |= (HDFGRTR_EL2_nBRBIDR | HDFGRTR_EL2_nBRBCTL |
-			 HDFGRTR_EL2_nBRBDATA);
-	if (!kvm_has_feat(kvm, ID_AA64DFR0_EL1, PMSVer, V1P2))
-		res0 |= HDFGRTR_EL2_nPMSNEVFR_EL1;
+	res1 = 0;
+	res0 = get_reg_disabled_bits(kvm, HDFGRTR_EL2);
 	set_sysreg_masks(kvm, HDFGRTR_EL2, res0 | hdfgrtr_masks.res0, res1);
-
-	/* Reuse the bits from the read-side and add the write-specific stuff */
-	if (!kvm_has_feat(kvm, ID_AA64DFR0_EL1, PMUVer, IMP))
-		res0 |= (HDFGWTR_EL2_PMCR_EL0 | HDFGWTR_EL2_PMSWINC_EL0);
-	if (!kvm_has_feat(kvm, ID_AA64DFR0_EL1, TraceVer, IMP))
-		res0 |= HDFGWTR_EL2_TRCOSLAR;
-	if (!kvm_has_feat(kvm, ID_AA64DFR0_EL1, TraceFilt, IMP))
-		res0 |= HDFGWTR_EL2_TRFCR_EL1;
+	res0 = get_reg_disabled_bits(kvm, HDFGWTR_EL2);
 	set_sysreg_masks(kvm, HFGWTR_EL2, res0 | hdfgwtr_masks.res0, res1);
 
 	/* HFGITR_EL2 */
-	res0 = hfgitr_masks.res0;
 	res1 = HFGITR_EL2_RES1;
-	if (!kvm_has_feat(kvm, ID_AA64ISAR1_EL1, DPB, DPB2))
-		res0 |= HFGITR_EL2_DCCVADP;
-	if (!kvm_has_feat(kvm, ID_AA64MMFR1_EL1, PAN, PAN2))
-		res0 |= (HFGITR_EL2_ATS1E1RP | HFGITR_EL2_ATS1E1WP);
-	if (!kvm_has_feat(kvm, ID_AA64ISAR0_EL1, TLB, OS))
-		res0 |= (HFGITR_EL2_TLBIRVAALE1OS | HFGITR_EL2_TLBIRVALE1OS |
-			 HFGITR_EL2_TLBIRVAAE1OS | HFGITR_EL2_TLBIRVAE1OS |
-			 HFGITR_EL2_TLBIVAALE1OS | HFGITR_EL2_TLBIVALE1OS |
-			 HFGITR_EL2_TLBIVAAE1OS | HFGITR_EL2_TLBIASIDE1OS |
-			 HFGITR_EL2_TLBIVAE1OS | HFGITR_EL2_TLBIVMALLE1OS);
-	if (!kvm_has_feat(kvm, ID_AA64ISAR0_EL1, TLB, RANGE))
-		res0 |= (HFGITR_EL2_TLBIRVAALE1 | HFGITR_EL2_TLBIRVALE1 |
-			 HFGITR_EL2_TLBIRVAAE1 | HFGITR_EL2_TLBIRVAE1 |
-			 HFGITR_EL2_TLBIRVAALE1IS | HFGITR_EL2_TLBIRVALE1IS |
-			 HFGITR_EL2_TLBIRVAAE1IS | HFGITR_EL2_TLBIRVAE1IS |
-			 HFGITR_EL2_TLBIRVAALE1OS | HFGITR_EL2_TLBIRVALE1OS |
-			 HFGITR_EL2_TLBIRVAAE1OS | HFGITR_EL2_TLBIRVAE1OS);
-	if (!kvm_has_feat(kvm, ID_AA64ISAR1_EL1, SPECRES, IMP))
-		res0 |= (HFGITR_EL2_CFPRCTX | HFGITR_EL2_DVPRCTX |
-			 HFGITR_EL2_CPPRCTX);
-	if (!kvm_has_feat(kvm, ID_AA64DFR0_EL1, BRBE, IMP))
-		res0 |= (HFGITR_EL2_nBRBINJ | HFGITR_EL2_nBRBIALL);
-	if (!kvm_has_feat(kvm, ID_AA64PFR1_EL1, GCS, IMP))
-		res0 |= (HFGITR_EL2_nGCSPUSHM_EL1 | HFGITR_EL2_nGCSSTR_EL1 |
-			 HFGITR_EL2_nGCSEPP);
-	if (!kvm_has_feat(kvm, ID_AA64ISAR1_EL1, SPECRES, COSP_RCTX))
-		res0 |= HFGITR_EL2_COSPRCTX;
-	if (!kvm_has_feat(kvm, ID_AA64ISAR2_EL1, ATS1A, IMP))
-		res0 |= HFGITR_EL2_ATS1E1A;
-	set_sysreg_masks(kvm, HFGITR_EL2, res0, res1);
+	res0 = get_reg_disabled_bits(kvm, HFGITR_EL2);
+	set_sysreg_masks(kvm, HFGITR_EL2, res0 | hfgitr_masks.res0, res1);
 
 	/* HAFGRTR_EL2 - not a lot to see here */
-	res0 = hafgrtr_masks.res0;
 	res1 = HAFGRTR_EL2_RES1;
-	if (!kvm_has_feat(kvm, ID_AA64PFR0_EL1, AMU, V1P1))
-		res0 |= ~(res0 | res1);
-	set_sysreg_masks(kvm, HAFGRTR_EL2, res0, res1);
+	res0 = get_reg_disabled_bits(kvm, HAFGRTR_EL2);
+	set_sysreg_masks(kvm, HAFGRTR_EL2, res0 | hafgrtr_masks.res0, res1);
 
 	/* TCR2_EL2 */
 	res0 = TCR2_EL2_RES0;