diff mbox series

[v1,6/6] RISCV: KVM: Add sstateen0 to ONE_REG

Message ID 20230719160316.4048022-7-mchitale@ventanamicro.com (mailing list archive)
State Superseded
Headers show
Series Risc-V Kvm Smstateen | expand

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conchuod/cover_letter success Series has a cover letter
conchuod/tree_selection success Guessed tree name to be for-next at HEAD 471aba2e4760
conchuod/fixes_present success Fixes tag not required for -next series
conchuod/maintainers_pattern success MAINTAINERS pattern errors before the patch: 4 and now 4
conchuod/verify_signedoff success Signed-off-by tag matches author and committer
conchuod/kdoc success Errors and warnings before: 0 this patch: 0
conchuod/build_rv64_clang_allmodconfig success Errors and warnings before: 9 this patch: 9
conchuod/module_param success Was 0 now: 0
conchuod/build_rv64_gcc_allmodconfig success Errors and warnings before: 24 this patch: 24
conchuod/build_rv32_defconfig success Build OK
conchuod/dtb_warn_rv64 success Errors and warnings before: 3 this patch: 3
conchuod/header_inline success No static functions without inline keyword in header files
conchuod/checkpatch success total: 0 errors, 0 warnings, 0 checks, 83 lines checked
conchuod/build_rv64_nommu_k210_defconfig success Build OK
conchuod/verify_fixes success No Fixes tag
conchuod/build_rv64_nommu_virt_defconfig success Build OK

Commit Message

Mayuresh Chitale July 19, 2023, 4:03 p.m. UTC 
Add support for sstateen0 CSR to the ONE_REG interface to allow its
access from user space.

Signed-off-by: Mayuresh Chitale <mchitale@ventanamicro.com>
---
 arch/riscv/include/uapi/asm/kvm.h |  9 +++++++
 arch/riscv/kvm/vcpu.c             | 40 +++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)
diff mbox series

Patch

diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
index 74c7f42de29d..bdddfb20299a 100644
--- a/arch/riscv/include/uapi/asm/kvm.h
+++ b/arch/riscv/include/uapi/asm/kvm.h
@@ -93,6 +93,11 @@  struct kvm_riscv_aia_csr {
 	unsigned long iprio2h;
 };
 
+/* Smstateen CSR for KVM_GET_ONE_REG and KVM_SET_ONE_REG */
+struct kvm_riscv_smstateen_csr {
+	unsigned long sstateen0;
+};
+
 /* TIMER registers for KVM_GET_ONE_REG and KVM_SET_ONE_REG */
 struct kvm_riscv_timer {
 	__u64 frequency;
@@ -173,10 +178,14 @@  enum KVM_RISCV_SBI_EXT_ID {
 #define KVM_REG_RISCV_CSR		(0x03 << KVM_REG_RISCV_TYPE_SHIFT)
 #define KVM_REG_RISCV_CSR_GENERAL	(0x0 << KVM_REG_RISCV_SUBTYPE_SHIFT)
 #define KVM_REG_RISCV_CSR_AIA		(0x1 << KVM_REG_RISCV_SUBTYPE_SHIFT)
+#define KVM_REG_RISCV_CSR_SMSTATEEN	(0x2 << KVM_REG_RISCV_SUBTYPE_SHIFT)
+
 #define KVM_REG_RISCV_CSR_REG(name)	\
 		(offsetof(struct kvm_riscv_csr, name) / sizeof(unsigned long))
 #define KVM_REG_RISCV_CSR_AIA_REG(name)	\
 	(offsetof(struct kvm_riscv_aia_csr, name) / sizeof(unsigned long))
+#define KVM_REG_RISCV_CSR_SMSTATEEN_REG(name)	\
+	(offsetof(struct kvm_riscv_smstateen_csr, name) / sizeof(unsigned long))
 
 /* Timer registers are mapped as type 4 */
 #define KVM_REG_RISCV_TIMER		(0x04 << KVM_REG_RISCV_TYPE_SHIFT)
diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index ae750decbefe..af7549374c4b 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -507,6 +507,34 @@  static int kvm_riscv_vcpu_general_get_csr(struct kvm_vcpu *vcpu,
 	return 0;
 }
 
+static inline int kvm_riscv_vcpu_smstateen_set_csr(struct kvm_vcpu *vcpu,
+						   unsigned long reg_num,
+						   unsigned long reg_val)
+{
+	struct kvm_vcpu_smstateen_csr *csr = &vcpu->arch.smstateen_csr;
+
+	if (reg_num >= sizeof(struct kvm_riscv_smstateen_csr) /
+	    sizeof(unsigned long))
+		return -EINVAL;
+
+	((unsigned long *)csr)[reg_num] = reg_val;
+	return 0;
+}
+
+static int kvm_riscv_vcpu_smstateen_get_csr(struct kvm_vcpu *vcpu,
+					    unsigned long reg_num,
+					    unsigned long *out_val)
+{
+	struct kvm_vcpu_smstateen_csr *csr = &vcpu->arch.smstateen_csr;
+
+	if (reg_num >= sizeof(struct kvm_riscv_smstateen_csr) /
+	    sizeof(unsigned long))
+		return -EINVAL;
+
+	*out_val = ((unsigned long *)csr)[reg_num];
+	return 0;
+}
+
 static inline int kvm_riscv_vcpu_general_set_csr(struct kvm_vcpu *vcpu,
 						 unsigned long reg_num,
 						 unsigned long reg_val)
@@ -552,6 +580,12 @@  static int kvm_riscv_vcpu_get_reg_csr(struct kvm_vcpu *vcpu,
 	case KVM_REG_RISCV_CSR_AIA:
 		rc = kvm_riscv_vcpu_aia_get_csr(vcpu, reg_num, &reg_val);
 		break;
+	case KVM_REG_RISCV_CSR_SMSTATEEN:
+		rc = -EINVAL;
+		if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SMSTATEEN))
+			rc = kvm_riscv_vcpu_smstateen_get_csr(vcpu, reg_num,
+							      &reg_val);
+		break;
 	default:
 		rc = -EINVAL;
 		break;
@@ -591,6 +625,12 @@  static int kvm_riscv_vcpu_set_reg_csr(struct kvm_vcpu *vcpu,
 	case KVM_REG_RISCV_CSR_AIA:
 		rc = kvm_riscv_vcpu_aia_set_csr(vcpu, reg_num, reg_val);
 		break;
+	case KVM_REG_RISCV_CSR_SMSTATEEN:
+		rc = -EINVAL;
+		if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SMSTATEEN))
+			rc = kvm_riscv_vcpu_smstateen_set_csr(vcpu, reg_num,
+							      reg_val);
+		break;
 	default:
 		rc = -EINVAL;
 		break;