Merge branch 'kvm-arm64/pmu-debug-fixes-5.11' into kvmarm-master/next

Signed-off-by: NMarc Zyngier <maz@kernel.org>

arch/arm64/include/asm/sysreg.h

@@ -846,7 +846,10 @@
 
 #define ID_DFR0_PERFMON_SHIFT		24
 
+#define ID_DFR0_PERFMON_8_0		0x3
 #define ID_DFR0_PERFMON_8_1		0x4
+#define ID_DFR0_PERFMON_8_4		0x5
+#define ID_DFR0_PERFMON_8_5		0x6
 
 #define ID_ISAR4_SWP_FRAC_SHIFT		28
 #define ID_ISAR4_PSR_M_SHIFT		24

arch/arm64/kvm/pmu-emul.c

@@ -23,11 +23,11 @@ static void kvm_pmu_stop_counter(struct kvm_vcpu *vcpu, struct kvm_pmc *pmc);
 static u32 kvm_pmu_event_mask(struct kvm *kvm)
 {
 	switch (kvm->arch.pmuver) {
-	case 1:			/* ARMv8.0 */
+	case ID_AA64DFR0_PMUVER_8_0:
 		return GENMASK(9, 0);
-	case 4:			/* ARMv8.1 */
-	case 5:			/* ARMv8.4 */
-	case 6:			/* ARMv8.5 */
+	case ID_AA64DFR0_PMUVER_8_1:
+	case ID_AA64DFR0_PMUVER_8_4:
+	case ID_AA64DFR0_PMUVER_8_5:
 		return GENMASK(15, 0);
 	default:		/* Shouldn't be here, just for sanity */
 		WARN_ONCE(1, "Unknown PMU version %d\n", kvm->arch.pmuver);
@@ -795,6 +795,12 @@ u64 kvm_pmu_get_pmceid(struct kvm_vcpu *vcpu, bool pmceid1)
 		base = 0;
 	} else {
 		val = read_sysreg(pmceid1_el0);
+		/*
+		 * Don't advertise STALL_SLOT, as PMMIR_EL0 is handled
+		 * as RAZ
+		 */
+		if (vcpu->kvm->arch.pmuver >= ID_AA64DFR0_PMUVER_8_4)
+			val &= ~BIT_ULL(ARMV8_PMUV3_PERFCTR_STALL_SLOT - 32);
 		base = 32;
 	}
 

arch/arm64/kvm/sys_regs.c

@@ -9,6 +9,7 @@
  *          Christoffer Dall <c.dall@virtualopensystems.com>
  */
 
+#include <linux/bitfield.h>
 #include <linux/bsearch.h>
 #include <linux/kvm_host.h>
 #include <linux/mm.h>
@@ -700,14 +701,18 @@ static bool access_pmselr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 static bool access_pmceid(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 			  const struct sys_reg_desc *r)
 {
-	u64 pmceid;
+	u64 pmceid, mask, shift;
 
 	BUG_ON(p->is_write);
 
 	if (pmu_access_el0_disabled(vcpu))
 		return false;
 
+	get_access_mask(r, &mask, &shift);
+
 	pmceid = kvm_pmu_get_pmceid(vcpu, (p->Op2 & 1));
+	pmceid &= mask;
+	pmceid >>= shift;
 
 	p->regval = pmceid;
 
@@ -1021,6 +1026,8 @@ static bool access_arch_timer(struct kvm_vcpu *vcpu,
 	return true;
 }
 
+#define FEATURE(x)	(GENMASK_ULL(x##_SHIFT + 3, x##_SHIFT))
+
 /* Read a sanitised cpufeature ID register by sys_reg_desc */
 static u64 read_id_reg(const struct kvm_vcpu *vcpu,
 		struct sys_reg_desc const *r, bool raz)
@@ -1028,36 +1035,41 @@ static u64 read_id_reg(const struct kvm_vcpu *vcpu,
 	u32 id = reg_to_encoding(r);
 	u64 val = raz ? 0 : read_sanitised_ftr_reg(id);
 
-	if (id == SYS_ID_AA64PFR0_EL1) {
+	switch (id) {
+	case SYS_ID_AA64PFR0_EL1:
 		if (!vcpu_has_sve(vcpu))
-			val &= ~(0xfUL << ID_AA64PFR0_SVE_SHIFT);
-		val &= ~(0xfUL << ID_AA64PFR0_AMU_SHIFT);
-		val &= ~(0xfUL << ID_AA64PFR0_CSV2_SHIFT);
-		val |= ((u64)vcpu->kvm->arch.pfr0_csv2 << ID_AA64PFR0_CSV2_SHIFT);
-		val &= ~(0xfUL << ID_AA64PFR0_CSV3_SHIFT);
-		val |= ((u64)vcpu->kvm->arch.pfr0_csv3 << ID_AA64PFR0_CSV3_SHIFT);
-	} else if (id == SYS_ID_AA64PFR1_EL1) {
-		val &= ~(0xfUL << ID_AA64PFR1_MTE_SHIFT);
-	} else if (id == SYS_ID_AA64ISAR1_EL1 && !vcpu_has_ptrauth(vcpu)) {
-		val &= ~((0xfUL << ID_AA64ISAR1_APA_SHIFT) |
-			 (0xfUL << ID_AA64ISAR1_API_SHIFT) |
-			 (0xfUL << ID_AA64ISAR1_GPA_SHIFT) |
-			 (0xfUL << ID_AA64ISAR1_GPI_SHIFT));
-	} else if (id == SYS_ID_AA64DFR0_EL1) {
-		u64 cap = 0;
-
-		/* Limit guests to PMUv3 for ARMv8.1 */
-		if (kvm_vcpu_has_pmu(vcpu))
-			cap = ID_AA64DFR0_PMUVER_8_1;
-
+			val &= ~FEATURE(ID_AA64PFR0_SVE);
+		val &= ~FEATURE(ID_AA64PFR0_AMU);
+		val &= ~FEATURE(ID_AA64PFR0_CSV2);
+		val |= FIELD_PREP(FEATURE(ID_AA64PFR0_CSV2), (u64)vcpu->kvm->arch.pfr0_csv2);
+		val &= ~FEATURE(ID_AA64PFR0_CSV3);
+		val |= FIELD_PREP(FEATURE(ID_AA64PFR0_CSV3), (u64)vcpu->kvm->arch.pfr0_csv3);
+		break;
+	case SYS_ID_AA64PFR1_EL1:
+		val &= ~FEATURE(ID_AA64PFR1_MTE);
+		break;
+	case SYS_ID_AA64ISAR1_EL1:
+		if (!vcpu_has_ptrauth(vcpu))
+			val &= ~(FEATURE(ID_AA64ISAR1_APA) |
+				 FEATURE(ID_AA64ISAR1_API) |
+				 FEATURE(ID_AA64ISAR1_GPA) |
+				 FEATURE(ID_AA64ISAR1_GPI));
+		break;
+	case SYS_ID_AA64DFR0_EL1:
+		/* Limit debug to ARMv8.0 */
+		val &= ~FEATURE(ID_AA64DFR0_DEBUGVER);
+		val |= FIELD_PREP(FEATURE(ID_AA64DFR0_DEBUGVER), 6);
+		/* Limit guests to PMUv3 for ARMv8.4 */
 		val = cpuid_feature_cap_perfmon_field(val,
-						ID_AA64DFR0_PMUVER_SHIFT,
-						cap);
-	} else if (id == SYS_ID_DFR0_EL1) {
-		/* Limit guests to PMUv3 for ARMv8.1 */
+						      ID_AA64DFR0_PMUVER_SHIFT,
+						      kvm_vcpu_has_pmu(vcpu) ? ID_AA64DFR0_PMUVER_8_4 : 0);
+		break;
+	case SYS_ID_DFR0_EL1:
+		/* Limit guests to PMUv3 for ARMv8.4 */
 		val = cpuid_feature_cap_perfmon_field(val,
-						ID_DFR0_PERFMON_SHIFT,
-						ID_DFR0_PERFMON_8_1);
+						      ID_DFR0_PERFMON_SHIFT,
+						      kvm_vcpu_has_pmu(vcpu) ? ID_DFR0_PERFMON_8_4 : 0);
+		break;
 	}
 
 	return val;
@@ -1493,6 +1505,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	  .access = access_pminten, .reg = PMINTENSET_EL1 },
 	{ PMU_SYS_REG(SYS_PMINTENCLR_EL1),
 	  .access = access_pminten, .reg = PMINTENSET_EL1 },
+	{ SYS_DESC(SYS_PMMIR_EL1), trap_raz_wi },
 
 	{ SYS_DESC(SYS_MAIR_EL1), access_vm_reg, reset_unknown, MAIR_EL1 },
 	{ SYS_DESC(SYS_AMAIR_EL1), access_vm_reg, reset_amair_el1, AMAIR_EL1 },
@@ -1720,7 +1733,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	{ SYS_DESC(SYS_FPEXC32_EL2), NULL, reset_val, FPEXC32_EL2, 0x700 },
 };
 
-static bool trap_dbgidr(struct kvm_vcpu *vcpu,
+static bool trap_dbgdidr(struct kvm_vcpu *vcpu,
 			struct sys_reg_params *p,
 			const struct sys_reg_desc *r)
 {
@@ -1734,7 +1747,7 @@ static bool trap_dbgidr(struct kvm_vcpu *vcpu,
 		p->regval = ((((dfr >> ID_AA64DFR0_WRPS_SHIFT) & 0xf) << 28) |
 			     (((dfr >> ID_AA64DFR0_BRPS_SHIFT) & 0xf) << 24) |
 			     (((dfr >> ID_AA64DFR0_CTX_CMPS_SHIFT) & 0xf) << 20)
-			     | (6 << 16) | (el3 << 14) | (el3 << 12));
+			     | (6 << 16) | (1 << 15) | (el3 << 14) | (el3 << 12));
 		return true;
 	}
 }
@@ -1767,8 +1780,8 @@ static bool trap_dbgidr(struct kvm_vcpu *vcpu,
  * guest. Revisit this one day, would this principle change.
  */
 static const struct sys_reg_desc cp14_regs[] = {
-	/* DBGIDR */
-	{ Op1( 0), CRn( 0), CRm( 0), Op2( 0), trap_dbgidr },
+	/* DBGDIDR */
+	{ Op1( 0), CRn( 0), CRm( 0), Op2( 0), trap_dbgdidr },
 	/* DBGDTRRXext */
 	{ Op1( 0), CRn( 0), CRm( 0), Op2( 2), trap_raz_wi },
 
@@ -1918,8 +1931,8 @@ static const struct sys_reg_desc cp15_regs[] = {
 	{ Op1( 0), CRn( 9), CRm(12), Op2( 3), access_pmovs },
 	{ Op1( 0), CRn( 9), CRm(12), Op2( 4), access_pmswinc },
 	{ Op1( 0), CRn( 9), CRm(12), Op2( 5), access_pmselr },
-	{ Op1( 0), CRn( 9), CRm(12), Op2( 6), access_pmceid },
-	{ Op1( 0), CRn( 9), CRm(12), Op2( 7), access_pmceid },
+	{ AA32(LO), Op1( 0), CRn( 9), CRm(12), Op2( 6), access_pmceid },
+	{ AA32(LO), Op1( 0), CRn( 9), CRm(12), Op2( 7), access_pmceid },
 	{ Op1( 0), CRn( 9), CRm(13), Op2( 0), access_pmu_evcntr },
 	{ Op1( 0), CRn( 9), CRm(13), Op2( 1), access_pmu_evtyper },
 	{ Op1( 0), CRn( 9), CRm(13), Op2( 2), access_pmu_evcntr },
@@ -1927,6 +1940,10 @@ static const struct sys_reg_desc cp15_regs[] = {
 	{ Op1( 0), CRn( 9), CRm(14), Op2( 1), access_pminten },
 	{ Op1( 0), CRn( 9), CRm(14), Op2( 2), access_pminten },
 	{ Op1( 0), CRn( 9), CRm(14), Op2( 3), access_pmovs },
+	{ AA32(HI), Op1( 0), CRn( 9), CRm(14), Op2( 4), access_pmceid },
+	{ AA32(HI), Op1( 0), CRn( 9), CRm(14), Op2( 5), access_pmceid },
+	/* PMMIR */
+	{ Op1( 0), CRn( 9), CRm(14), Op2( 6), trap_raz_wi },
 
 	/* PRRR/MAIR0 */
 	{ AA32(LO), Op1( 0), CRn(10), CRm( 2), Op2( 0), access_vm_reg, NULL, MAIR_EL1 },