[PATCH RFC v2 08/22] KVM: arm64: Rename SVE finalization constants to be more general

Mark Brown broonie at kernel.org
Fri Dec 22 08:21:16 PST 2023


Due to the overlap between SVE and SME vector length configuration
created by streaming mode SVE we will finalize both at once.  Rename the
existing finalization to use _VEC (vector) for the naming to avoid
confusion.

Since this includes the userspace API we create an alias
KVM_ARM_VCPU_VEC for the existing KVM_ARM_VCPU_SVE capability, existing
code which does not enable SME will be unaffected and any SME only code
will not need to use SVE constants.

No functional change.

Signed-off-by: Mark Brown <broonie at kernel.org>
---
 arch/arm64/include/asm/kvm_host.h |  8 +++++---
 arch/arm64/include/uapi/asm/kvm.h |  6 ++++++
 arch/arm64/kvm/guest.c            | 10 +++++-----
 arch/arm64/kvm/reset.c            | 16 ++++++++--------
 4 files changed, 24 insertions(+), 16 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index 461068c99b61..920f8a1ff901 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -704,8 +704,8 @@ struct kvm_vcpu_arch {
 
 /* SVE exposed to guest */
 #define GUEST_HAS_SVE		__vcpu_single_flag(cflags, BIT(0))
-/* SVE config completed */
-#define VCPU_SVE_FINALIZED	__vcpu_single_flag(cflags, BIT(1))
+/* SVE/SME config completed */
+#define VCPU_VEC_FINALIZED	__vcpu_single_flag(cflags, BIT(1))
 /* PTRAUTH exposed to guest */
 #define GUEST_HAS_PTRAUTH	__vcpu_single_flag(cflags, BIT(2))
 /* KVM_ARM_VCPU_INIT completed */
@@ -793,6 +793,8 @@ struct kvm_vcpu_arch {
 #define vcpu_has_fa64(vcpu) (system_supports_fa64() &&			\
 			     vcpu_get_flag(vcpu, GUEST_HAS_FA64))
 
+#define vcpu_has_vec(vcpu) (vcpu_has_sve(vcpu) || vcpu_has_sme(vcpu))
+
 #ifdef CONFIG_ARM64_PTR_AUTH
 #define vcpu_has_ptrauth(vcpu)						\
 	((cpus_have_final_cap(ARM64_HAS_ADDRESS_AUTH) ||		\
@@ -1179,7 +1181,7 @@ static inline bool kvm_vm_is_protected(struct kvm *kvm)
 int kvm_arm_vcpu_finalize(struct kvm_vcpu *vcpu, int feature);
 bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu);
 
-#define kvm_arm_vcpu_sve_finalized(vcpu) vcpu_get_flag(vcpu, VCPU_SVE_FINALIZED)
+#define kvm_arm_vcpu_vec_finalized(vcpu) vcpu_get_flag(vcpu, VCPU_VEC_FINALIZED)
 
 #define kvm_has_mte(kvm)					\
 	(system_supports_mte() &&				\
diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
index 89d2fc872d9f..3048890fac68 100644
--- a/arch/arm64/include/uapi/asm/kvm.h
+++ b/arch/arm64/include/uapi/asm/kvm.h
@@ -111,6 +111,12 @@ struct kvm_regs {
 #define KVM_ARM_VCPU_PTRAUTH_GENERIC	6 /* VCPU uses generic authentication */
 #define KVM_ARM_VCPU_HAS_EL2		7 /* Support nested virtualization */
 
+/*
+ * An alias for _SVE since we finalize VL configuration for both SVE and SME
+ * simultaneously.
+ */
+#define KVM_ARM_VCPU_VEC       		KVM_ARM_VCPU_SVE
+
 struct kvm_vcpu_init {
 	__u32 target;
 	__u32 features[7];
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 3ae08f7c0b80..6e116fd8a917 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -341,7 +341,7 @@ static int set_sve_vls(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 	if (!vcpu_has_sve(vcpu))
 		return -ENOENT;
 
-	if (kvm_arm_vcpu_sve_finalized(vcpu))
+	if (kvm_arm_vcpu_vec_finalized(vcpu))
 		return -EPERM; /* too late! */
 
 	if (WARN_ON(vcpu->arch.sve_state))
@@ -496,7 +496,7 @@ static int get_sve_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 	if (ret)
 		return ret;
 
-	if (!kvm_arm_vcpu_sve_finalized(vcpu))
+	if (!kvm_arm_vcpu_vec_finalized(vcpu))
 		return -EPERM;
 
 	if (copy_to_user(uptr, vcpu->arch.sve_state + region.koffset,
@@ -522,7 +522,7 @@ static int set_sve_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
 	if (ret)
 		return ret;
 
-	if (!kvm_arm_vcpu_sve_finalized(vcpu))
+	if (!kvm_arm_vcpu_vec_finalized(vcpu))
 		return -EPERM;
 
 	if (copy_from_user(vcpu->arch.sve_state + region.koffset, uptr,
@@ -656,7 +656,7 @@ static unsigned long num_sve_regs(const struct kvm_vcpu *vcpu)
 		return 0;
 
 	/* Policed by KVM_GET_REG_LIST: */
-	WARN_ON(!kvm_arm_vcpu_sve_finalized(vcpu));
+	WARN_ON(!kvm_arm_vcpu_vec_finalized(vcpu));
 
 	return slices * (SVE_NUM_PREGS + SVE_NUM_ZREGS + 1 /* FFR */)
 		+ 1; /* KVM_REG_ARM64_SVE_VLS */
@@ -674,7 +674,7 @@ static int copy_sve_reg_indices(const struct kvm_vcpu *vcpu,
 		return 0;
 
 	/* Policed by KVM_GET_REG_LIST: */
-	WARN_ON(!kvm_arm_vcpu_sve_finalized(vcpu));
+	WARN_ON(!kvm_arm_vcpu_vec_finalized(vcpu));
 
 	/*
 	 * Enumerate this first, so that userspace can save/restore in
diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
index 81b949dd809d..ab7cd657a73c 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -89,7 +89,7 @@ static void kvm_vcpu_enable_sve(struct kvm_vcpu *vcpu)
  * Finalize vcpu's maximum SVE vector length, allocating
  * vcpu->arch.sve_state as necessary.
  */
-static int kvm_vcpu_finalize_sve(struct kvm_vcpu *vcpu)
+static int kvm_vcpu_finalize_vec(struct kvm_vcpu *vcpu)
 {
 	void *buf;
 	unsigned int vl;
@@ -119,21 +119,21 @@ static int kvm_vcpu_finalize_sve(struct kvm_vcpu *vcpu)
 	}
 	
 	vcpu->arch.sve_state = buf;
-	vcpu_set_flag(vcpu, VCPU_SVE_FINALIZED);
+	vcpu_set_flag(vcpu, VCPU_VEC_FINALIZED);
 	return 0;
 }
 
 int kvm_arm_vcpu_finalize(struct kvm_vcpu *vcpu, int feature)
 {
 	switch (feature) {
-	case KVM_ARM_VCPU_SVE:
-		if (!vcpu_has_sve(vcpu))
+	case KVM_ARM_VCPU_VEC:
+		if (!vcpu_has_vec(vcpu))
 			return -EINVAL;
 
-		if (kvm_arm_vcpu_sve_finalized(vcpu))
+		if (kvm_arm_vcpu_vec_finalized(vcpu))
 			return -EPERM;
 
-		return kvm_vcpu_finalize_sve(vcpu);
+		return kvm_vcpu_finalize_vec(vcpu);
 	}
 
 	return -EINVAL;
@@ -141,7 +141,7 @@ int kvm_arm_vcpu_finalize(struct kvm_vcpu *vcpu, int feature)
 
 bool kvm_arm_vcpu_is_finalized(struct kvm_vcpu *vcpu)
 {
-	if (vcpu_has_sve(vcpu) && !kvm_arm_vcpu_sve_finalized(vcpu))
+	if (vcpu_has_vec(vcpu) && !kvm_arm_vcpu_vec_finalized(vcpu))
 		return false;
 
 	return true;
@@ -207,7 +207,7 @@ void kvm_reset_vcpu(struct kvm_vcpu *vcpu)
 	if (loaded)
 		kvm_arch_vcpu_put(vcpu);
 
-	if (!kvm_arm_vcpu_sve_finalized(vcpu)) {
+	if (!kvm_arm_vcpu_vec_finalized(vcpu)) {
 		if (vcpu_has_feature(vcpu, KVM_ARM_VCPU_SVE))
 			kvm_vcpu_enable_sve(vcpu);
 	} else {

-- 
2.30.2




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