[PATCH 0/3] KVM/arm64 fixes for 5.10, take #3

[PATCH 0/3] KVM/arm64 fixes for 5.10, take #3

[Marc Zyngier]

Paolo,

Here's another small set of fixes for 5.10, this time fixing some
corner cases of the Spectre mitigation rework. Note that I had to pull
5.10-rc1 into kvmarm/next in order to avoid some annoying conflicts.

Please pull,

	M.

The following changes since commit 4f6b838c378a52ea3ae0b15f12ca8a20849072fa:

  Merge tag 'v5.10-rc1' into kvmarm-master/next (2020-11-12 21:20:43 +0000)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git tags/kvmarm-fixes-5.10-3

for you to fetch changes up to ed4ffaf49bf9ce1002b516d8c6aa04937b7950bc:

  KVM: arm64: Handle SCXTNUM_ELx traps (2020-11-12 21:22:46 +0000)

----------------------------------------------------------------
KVM/arm64 fixes for v5.10, take #3

- Allow userspace to downgrade ID_AA64PFR0_EL1.CSV2
- Inject UNDEF on SCXTNUM_ELx access

----------------------------------------------------------------
Marc Zyngier (3):
      KVM: arm64: Allow setting of ID_AA64PFR0_EL1.CSV2 from userspace
      KVM: arm64: Unify trap handlers injecting an UNDEF
      KVM: arm64: Handle SCXTNUM_ELx traps

 arch/arm64/include/asm/kvm_host.h |   2 +
 arch/arm64/include/asm/sysreg.h   |   4 ++
 arch/arm64/kvm/arm.c              |  16 ++++++
 arch/arm64/kvm/sys_regs.c         | 111 +++++++++++++++++++++++---------------
 4 files changed, 89 insertions(+), 44 deletions(-)

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[PATCH 1/3] KVM: arm64: Allow setting of ID_AA64PFR0_EL1.CSV2 from userspace

[Marc Zyngier]

We now expose ID_AA64PFR0_EL1.CSV2=1 to guests running on hosts
that are immune to Spectre-v2, but that don't have this field set,
most likely because they predate the specification.

However, this prevents the migration of guests that have started on
a host the doesn't fake this CSV2 setting to one that does, as KVM
rejects the write to ID_AA64PFR0_EL2 on the grounds that it isn't
what is already there.

In order to fix this, allow userspace to set this field as long as
this doesn't result in a promising more than what is already there
(setting CSV2 to 0 is acceptable, but setting it to 1 when it is
already set to 0 isn't).

Fixes: e1026237f9067 ("KVM: arm64: Set CSV2 for guests on hardware unaffected by Spectre-v2")
Reported-by: Peng Liang <liangpeng10@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20201110141308.451654-2-maz@kernel.org
---
 arch/arm64/include/asm/kvm_host.h |  2 ++
 arch/arm64/kvm/arm.c              | 16 ++++++++++++
 arch/arm64/kvm/sys_regs.c         | 42 ++++++++++++++++++++++++++++---
 3 files changed, 56 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 781d029b8aa8..0cd9f0f75c13 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -118,6 +118,8 @@ struct kvm_arch {
 	 */
 	unsigned long *pmu_filter;
 	unsigned int pmuver;
+
+	u8 pfr0_csv2;
 };
 
 struct kvm_vcpu_fault_info {
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index a3b32df1afb0..a6e25a4b4dc5 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -102,6 +102,20 @@ static int kvm_arm_default_max_vcpus(void)
 	return vgic_present ? kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
 }
 
+static void set_default_csv2(struct kvm *kvm)
+{
+	/*
+	 * The default is to expose CSV2 == 1 if the HW isn't affected.
+	 * Although this is a per-CPU feature, we make it global because
+	 * asymmetric systems are just a nuisance.
+	 *
+	 * Userspace can override this as long as it doesn't promise
+	 * the impossible.
+	 */
+	if (arm64_get_spectre_v2_state() == SPECTRE_UNAFFECTED)
+		kvm->arch.pfr0_csv2 = 1;
+}
+
 /**
  * kvm_arch_init_vm - initializes a VM data structure
  * @kvm:	pointer to the KVM struct
@@ -127,6 +141,8 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
 	/* The maximum number of VCPUs is limited by the host's GIC model */
 	kvm->arch.max_vcpus = kvm_arm_default_max_vcpus();
 
+	set_default_csv2(kvm);
+
 	return ret;
 out_free_stage2_pgd:
 	kvm_free_stage2_pgd(&kvm->arch.mmu);
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 6d287eefd9f1..0aa86250e354 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1128,9 +1128,8 @@ static u64 read_id_reg(const struct kvm_vcpu *vcpu,
 		if (!vcpu_has_sve(vcpu))
 			val &= ~(0xfUL << ID_AA64PFR0_SVE_SHIFT);
 		val &= ~(0xfUL << ID_AA64PFR0_AMU_SHIFT);
-		if (!(val & (0xfUL << ID_AA64PFR0_CSV2_SHIFT)) &&
-		    arm64_get_spectre_v2_state() == SPECTRE_UNAFFECTED)
-			val |= (1UL << ID_AA64PFR0_CSV2_SHIFT);
+		val &= ~(0xfUL << ID_AA64PFR0_CSV2_SHIFT);
+		val |= ((u64)vcpu->kvm->arch.pfr0_csv2 << ID_AA64PFR0_CSV2_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)) {
@@ -1213,6 +1212,40 @@ static unsigned int sve_visibility(const struct kvm_vcpu *vcpu,
 	return REG_HIDDEN;
 }
 
+static int set_id_aa64pfr0_el1(struct kvm_vcpu *vcpu,
+			       const struct sys_reg_desc *rd,
+			       const struct kvm_one_reg *reg, void __user *uaddr)
+{
+	const u64 id = sys_reg_to_index(rd);
+	int err;
+	u64 val;
+	u8 csv2;
+
+	err = reg_from_user(&val, uaddr, id);
+	if (err)
+		return err;
+
+	/*
+	 * Allow AA64PFR0_EL1.CSV2 to be set from userspace as long as
+	 * it doesn't promise more than what is actually provided (the
+	 * guest could otherwise be covered in ectoplasmic residue).
+	 */
+	csv2 = cpuid_feature_extract_unsigned_field(val, ID_AA64PFR0_CSV2_SHIFT);
+	if (csv2 > 1 ||
+	    (csv2 && arm64_get_spectre_v2_state() != SPECTRE_UNAFFECTED))
+		return -EINVAL;
+
+	/* We can only differ with CSV2, and anything else is an error */
+	val ^= read_id_reg(vcpu, rd, false);
+	val &= ~(0xFUL << ID_AA64PFR0_CSV2_SHIFT);
+	if (val)
+		return -EINVAL;
+
+	vcpu->kvm->arch.pfr0_csv2 = csv2;
+
+	return 0;
+}
+
 /*
  * cpufeature ID register user accessors
  *
@@ -1472,7 +1505,8 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 
 	/* AArch64 ID registers */
 	/* CRm=4 */
-	ID_SANITISED(ID_AA64PFR0_EL1),
+	{ SYS_DESC(SYS_ID_AA64PFR0_EL1), .access = access_id_reg,
+	  .get_user = get_id_reg, .set_user = set_id_aa64pfr0_el1, },
 	ID_SANITISED(ID_AA64PFR1_EL1),
 	ID_UNALLOCATED(4,2),
 	ID_UNALLOCATED(4,3),
-- 
2.28.0


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Re: [PATCH 0/3] KVM/arm64 fixes for 5.10, take #3

[Paolo Bonzini]

On 12/11/20 23:21, Marc Zyngier wrote:
> We now expose ID_AA64PFR0_EL1.CSV2=1 to guests running on hosts
> that are immune to Spectre-v2, but that don't have this field set,
> most likely because they predate the specification.
> 
> However, this prevents the migration of guests that have started on
> a host the doesn't fake this CSV2 setting to one that does, as KVM
> rejects the write to ID_AA64PFR0_EL2 on the grounds that it isn't
> what is already there.
> 
> In order to fix this, allow userspace to set this field as long as
> this doesn't result in a promising more than what is already there
> (setting CSV2 to 0 is acceptable, but setting it to 1 when it is
> already set to 0 isn't).
> 
> Fixes: e1026237f9067 ("KVM: arm64: Set CSV2 for guests on hardware unaffected by Spectre-v2")
> Reported-by: Peng Liang <liangpeng10@huawei.com>
> Signed-off-by: Marc Zyngier <maz@kernel.org>
> Acked-by: Will Deacon <will@kernel.org>
> Link: https://lore.kernel.org/r/20201110141308.451654-2-maz@kernel.org
> ---
>   arch/arm64/include/asm/kvm_host.h |  2 ++
>   arch/arm64/kvm/arm.c              | 16 ++++++++++++
>   arch/arm64/kvm/sys_regs.c         | 42 ++++++++++++++++++++++++++++---
>   3 files changed, 56 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
> index 781d029b8aa8..0cd9f0f75c13 100644
> --- a/arch/arm64/include/asm/kvm_host.h
> +++ b/arch/arm64/include/asm/kvm_host.h
> @@ -118,6 +118,8 @@ struct kvm_arch {
>   	 */
>   	unsigned long *pmu_filter;
>   	unsigned int pmuver;
> +
> +	u8 pfr0_csv2;
>   };
>   
>   struct kvm_vcpu_fault_info {
> diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
> index a3b32df1afb0..a6e25a4b4dc5 100644
> --- a/arch/arm64/kvm/arm.c
> +++ b/arch/arm64/kvm/arm.c
> @@ -102,6 +102,20 @@ static int kvm_arm_default_max_vcpus(void)
>   	return vgic_present ? kvm_vgic_get_max_vcpus() : KVM_MAX_VCPUS;
>   }
>   
> +static void set_default_csv2(struct kvm *kvm)
> +{
> +	/*
> +	 * The default is to expose CSV2 == 1 if the HW isn't affected.
> +	 * Although this is a per-CPU feature, we make it global because
> +	 * asymmetric systems are just a nuisance.
> +	 *
> +	 * Userspace can override this as long as it doesn't promise
> +	 * the impossible.
> +	 */
> +	if (arm64_get_spectre_v2_state() == SPECTRE_UNAFFECTED)
> +		kvm->arch.pfr0_csv2 = 1;
> +}
> +
>   /**
>    * kvm_arch_init_vm - initializes a VM data structure
>    * @kvm:	pointer to the KVM struct
> @@ -127,6 +141,8 @@ int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
>   	/* The maximum number of VCPUs is limited by the host's GIC model */
>   	kvm->arch.max_vcpus = kvm_arm_default_max_vcpus();
>   
> +	set_default_csv2(kvm);
> +
>   	return ret;
>   out_free_stage2_pgd:
>   	kvm_free_stage2_pgd(&kvm->arch.mmu);
> diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
> index 6d287eefd9f1..0aa86250e354 100644
> --- a/arch/arm64/kvm/sys_regs.c
> +++ b/arch/arm64/kvm/sys_regs.c
> @@ -1128,9 +1128,8 @@ static u64 read_id_reg(const struct kvm_vcpu *vcpu,
>   		if (!vcpu_has_sve(vcpu))
>   			val &= ~(0xfUL << ID_AA64PFR0_SVE_SHIFT);
>   		val &= ~(0xfUL << ID_AA64PFR0_AMU_SHIFT);
> -		if (!(val & (0xfUL << ID_AA64PFR0_CSV2_SHIFT)) &&
> -		    arm64_get_spectre_v2_state() == SPECTRE_UNAFFECTED)
> -			val |= (1UL << ID_AA64PFR0_CSV2_SHIFT);
> +		val &= ~(0xfUL << ID_AA64PFR0_CSV2_SHIFT);
> +		val |= ((u64)vcpu->kvm->arch.pfr0_csv2 << ID_AA64PFR0_CSV2_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)) {
> @@ -1213,6 +1212,40 @@ static unsigned int sve_visibility(const struct kvm_vcpu *vcpu,
>   	return REG_HIDDEN;
>   }
>   
> +static int set_id_aa64pfr0_el1(struct kvm_vcpu *vcpu,
> +			       const struct sys_reg_desc *rd,
> +			       const struct kvm_one_reg *reg, void __user *uaddr)
> +{
> +	const u64 id = sys_reg_to_index(rd);
> +	int err;
> +	u64 val;
> +	u8 csv2;
> +
> +	err = reg_from_user(&val, uaddr, id);
> +	if (err)
> +		return err;
> +
> +	/*
> +	 * Allow AA64PFR0_EL1.CSV2 to be set from userspace as long as
> +	 * it doesn't promise more than what is actually provided (the
> +	 * guest could otherwise be covered in ectoplasmic residue).
> +	 */
> +	csv2 = cpuid_feature_extract_unsigned_field(val, ID_AA64PFR0_CSV2_SHIFT);
> +	if (csv2 > 1 ||
> +	    (csv2 && arm64_get_spectre_v2_state() != SPECTRE_UNAFFECTED))
> +		return -EINVAL;
> +
> +	/* We can only differ with CSV2, and anything else is an error */
> +	val ^= read_id_reg(vcpu, rd, false);
> +	val &= ~(0xFUL << ID_AA64PFR0_CSV2_SHIFT);
> +	if (val)
> +		return -EINVAL;
> +
> +	vcpu->kvm->arch.pfr0_csv2 = csv2;
> +
> +	return 0;
> +}
> +
>   /*
>    * cpufeature ID register user accessors
>    *
> @@ -1472,7 +1505,8 @@ static const struct sys_reg_desc sys_reg_descs[] = {
>   
>   	/* AArch64 ID registers */
>   	/* CRm=4 */
> -	ID_SANITISED(ID_AA64PFR0_EL1),
> +	{ SYS_DESC(SYS_ID_AA64PFR0_EL1), .access = access_id_reg,
> +	  .get_user = get_id_reg, .set_user = set_id_aa64pfr0_el1, },
>   	ID_SANITISED(ID_AA64PFR1_EL1),
>   	ID_UNALLOCATED(4,2),
>   	ID_UNALLOCATED(4,3),
> 

Pulled, thanks.

Paolo


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[PATCH 2/3] KVM: arm64: Unify trap handlers injecting an UNDEF

[Marc Zyngier]

A large number of system register trap handlers only inject an
UNDEF exeption, and yet each class of sysreg seems to provide its
own, identical function.

Let's unify them all, saving us introducing yet another one later.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20201110141308.451654-3-maz@kernel.org
---
 arch/arm64/kvm/sys_regs.c | 65 +++++++++++++++------------------------
 1 file changed, 25 insertions(+), 40 deletions(-)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 0aa86250e354..b0022f37c8f1 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1038,8 +1038,8 @@ static bool access_pmuserenr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 	{ SYS_DESC(SYS_PMEVTYPERn_EL0(n)),					\
 	  access_pmu_evtyper, reset_unknown, (PMEVTYPER0_EL0 + n), }
 
-static bool access_amu(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
-			     const struct sys_reg_desc *r)
+static bool undef_access(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+			 const struct sys_reg_desc *r)
 {
 	kvm_inject_undefined(vcpu);
 
@@ -1047,24 +1047,10 @@ static bool access_amu(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 }
 
 /* Macro to expand the AMU counter and type registers*/
-#define AMU_AMEVCNTR0_EL0(n) { SYS_DESC(SYS_AMEVCNTR0_EL0(n)), access_amu }
-#define AMU_AMEVTYPER0_EL0(n) { SYS_DESC(SYS_AMEVTYPER0_EL0(n)), access_amu }
-#define AMU_AMEVCNTR1_EL0(n) { SYS_DESC(SYS_AMEVCNTR1_EL0(n)), access_amu }
-#define AMU_AMEVTYPER1_EL0(n) { SYS_DESC(SYS_AMEVTYPER1_EL0(n)), access_amu }
-
-static bool trap_ptrauth(struct kvm_vcpu *vcpu,
-			 struct sys_reg_params *p,
-			 const struct sys_reg_desc *rd)
-{
-	/*
-	 * If we land here, that is because we didn't fixup the access on exit
-	 * by allowing the PtrAuth sysregs. The only way this happens is when
-	 * the guest does not have PtrAuth support enabled.
-	 */
-	kvm_inject_undefined(vcpu);
-
-	return false;
-}
+#define AMU_AMEVCNTR0_EL0(n) { SYS_DESC(SYS_AMEVCNTR0_EL0(n)), undef_access }
+#define AMU_AMEVTYPER0_EL0(n) { SYS_DESC(SYS_AMEVTYPER0_EL0(n)), undef_access }
+#define AMU_AMEVCNTR1_EL0(n) { SYS_DESC(SYS_AMEVCNTR1_EL0(n)), undef_access }
+#define AMU_AMEVTYPER1_EL0(n) { SYS_DESC(SYS_AMEVTYPER1_EL0(n)), undef_access }
 
 static unsigned int ptrauth_visibility(const struct kvm_vcpu *vcpu,
 			const struct sys_reg_desc *rd)
@@ -1072,8 +1058,14 @@ static unsigned int ptrauth_visibility(const struct kvm_vcpu *vcpu,
 	return vcpu_has_ptrauth(vcpu) ? 0 : REG_HIDDEN;
 }
 
+/*
+ * If we land here on a PtrAuth access, that is because we didn't
+ * fixup the access on exit by allowing the PtrAuth sysregs. The only
+ * way this happens is when the guest does not have PtrAuth support
+ * enabled.
+ */
 #define __PTRAUTH_KEY(k)						\
-	{ SYS_DESC(SYS_## k), trap_ptrauth, reset_unknown, k,		\
+	{ SYS_DESC(SYS_## k), undef_access, reset_unknown, k,		\
 	.visibility = ptrauth_visibility}
 
 #define PTRAUTH_KEY(k)							\
@@ -1374,13 +1366,6 @@ static bool access_ccsidr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 	return true;
 }
 
-static bool access_mte_regs(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
-			    const struct sys_reg_desc *r)
-{
-	kvm_inject_undefined(vcpu);
-	return false;
-}
-
 /* sys_reg_desc initialiser for known cpufeature ID registers */
 #define ID_SANITISED(name) {			\
 	SYS_DESC(SYS_##name),			\
@@ -1549,8 +1534,8 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	{ SYS_DESC(SYS_ACTLR_EL1), access_actlr, reset_actlr, ACTLR_EL1 },
 	{ SYS_DESC(SYS_CPACR_EL1), NULL, reset_val, CPACR_EL1, 0 },
 
-	{ SYS_DESC(SYS_RGSR_EL1), access_mte_regs },
-	{ SYS_DESC(SYS_GCR_EL1), access_mte_regs },
+	{ SYS_DESC(SYS_RGSR_EL1), undef_access },
+	{ SYS_DESC(SYS_GCR_EL1), undef_access },
 
 	{ SYS_DESC(SYS_ZCR_EL1), NULL, reset_val, ZCR_EL1, 0, .visibility = sve_visibility },
 	{ SYS_DESC(SYS_TTBR0_EL1), access_vm_reg, reset_unknown, TTBR0_EL1 },
@@ -1576,8 +1561,8 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	{ SYS_DESC(SYS_ERXMISC0_EL1), trap_raz_wi },
 	{ SYS_DESC(SYS_ERXMISC1_EL1), trap_raz_wi },
 
-	{ SYS_DESC(SYS_TFSR_EL1), access_mte_regs },
-	{ SYS_DESC(SYS_TFSRE0_EL1), access_mte_regs },
+	{ SYS_DESC(SYS_TFSR_EL1), undef_access },
+	{ SYS_DESC(SYS_TFSRE0_EL1), undef_access },
 
 	{ SYS_DESC(SYS_FAR_EL1), access_vm_reg, reset_unknown, FAR_EL1 },
 	{ SYS_DESC(SYS_PAR_EL1), NULL, reset_unknown, PAR_EL1 },
@@ -1641,14 +1626,14 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	{ SYS_DESC(SYS_TPIDR_EL0), NULL, reset_unknown, TPIDR_EL0 },
 	{ SYS_DESC(SYS_TPIDRRO_EL0), NULL, reset_unknown, TPIDRRO_EL0 },
 
-	{ SYS_DESC(SYS_AMCR_EL0), access_amu },
-	{ SYS_DESC(SYS_AMCFGR_EL0), access_amu },
-	{ SYS_DESC(SYS_AMCGCR_EL0), access_amu },
-	{ SYS_DESC(SYS_AMUSERENR_EL0), access_amu },
-	{ SYS_DESC(SYS_AMCNTENCLR0_EL0), access_amu },
-	{ SYS_DESC(SYS_AMCNTENSET0_EL0), access_amu },
-	{ SYS_DESC(SYS_AMCNTENCLR1_EL0), access_amu },
-	{ SYS_DESC(SYS_AMCNTENSET1_EL0), access_amu },
+	{ SYS_DESC(SYS_AMCR_EL0), undef_access },
+	{ SYS_DESC(SYS_AMCFGR_EL0), undef_access },
+	{ SYS_DESC(SYS_AMCGCR_EL0), undef_access },
+	{ SYS_DESC(SYS_AMUSERENR_EL0), undef_access },
+	{ SYS_DESC(SYS_AMCNTENCLR0_EL0), undef_access },
+	{ SYS_DESC(SYS_AMCNTENSET0_EL0), undef_access },
+	{ SYS_DESC(SYS_AMCNTENCLR1_EL0), undef_access },
+	{ SYS_DESC(SYS_AMCNTENSET1_EL0), undef_access },
 	AMU_AMEVCNTR0_EL0(0),
 	AMU_AMEVCNTR0_EL0(1),
 	AMU_AMEVCNTR0_EL0(2),
-- 
2.28.0


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[PATCH 3/3] KVM: arm64: Handle SCXTNUM_ELx traps

[Marc Zyngier]

As the kernel never sets HCR_EL2.EnSCXT, accesses to SCXTNUM_ELx
will trap to EL2. Let's handle that as gracefully as possible
by injecting an UNDEF exception into the guest. This is consistent
with the guest's view of ID_AA64PFR0_EL1.CSV2 being at most 1.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20201110141308.451654-4-maz@kernel.org
---
 arch/arm64/include/asm/sysreg.h | 4 ++++
 arch/arm64/kvm/sys_regs.c       | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index d52c1b3ce589..a427a5653369 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -372,6 +372,8 @@
 #define SYS_CONTEXTIDR_EL1		sys_reg(3, 0, 13, 0, 1)
 #define SYS_TPIDR_EL1			sys_reg(3, 0, 13, 0, 4)
 
+#define SYS_SCXTNUM_EL1			sys_reg(3, 0, 13, 0, 7)
+
 #define SYS_CNTKCTL_EL1			sys_reg(3, 0, 14, 1, 0)
 
 #define SYS_CCSIDR_EL1			sys_reg(3, 1, 0, 0, 0)
@@ -404,6 +406,8 @@
 #define SYS_TPIDR_EL0			sys_reg(3, 3, 13, 0, 2)
 #define SYS_TPIDRRO_EL0			sys_reg(3, 3, 13, 0, 3)
 
+#define SYS_SCXTNUM_EL0			sys_reg(3, 3, 13, 0, 7)
+
 /* Definitions for system register interface to AMU for ARMv8.4 onwards */
 #define SYS_AM_EL0(crm, op2)		sys_reg(3, 3, 13, (crm), (op2))
 #define SYS_AMCR_EL0			SYS_AM_EL0(2, 0)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index b0022f37c8f1..c1726fb7f3d9 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1598,6 +1598,8 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	{ SYS_DESC(SYS_CONTEXTIDR_EL1), access_vm_reg, reset_val, CONTEXTIDR_EL1, 0 },
 	{ SYS_DESC(SYS_TPIDR_EL1), NULL, reset_unknown, TPIDR_EL1 },
 
+	{ SYS_DESC(SYS_SCXTNUM_EL1), undef_access },
+
 	{ SYS_DESC(SYS_CNTKCTL_EL1), NULL, reset_val, CNTKCTL_EL1, 0},
 
 	{ SYS_DESC(SYS_CCSIDR_EL1), access_ccsidr },
@@ -1626,6 +1628,8 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	{ SYS_DESC(SYS_TPIDR_EL0), NULL, reset_unknown, TPIDR_EL0 },
 	{ SYS_DESC(SYS_TPIDRRO_EL0), NULL, reset_unknown, TPIDRRO_EL0 },
 
+	{ SYS_DESC(SYS_SCXTNUM_EL0), undef_access },
+
 	{ SYS_DESC(SYS_AMCR_EL0), undef_access },
 	{ SYS_DESC(SYS_AMCFGR_EL0), undef_access },
 	{ SYS_DESC(SYS_AMCGCR_EL0), undef_access },
-- 
2.28.0


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