linux-kernel - [PATCH v3 6/8] RISC-V: KVM: Add ONE

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Message-Id: <20230403093310.2271142-7-apatel@ventanamicro.com>
Date:   Mon,  3 Apr 2023 15:03:08 +0530
From:   Anup Patel <apatel@...tanamicro.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Atish Patra <atishp@...shpatra.org>
Cc:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Andrew Jones <ajones@...tanamicro.com>,
        Anup Patel <anup@...infault.org>, kvm@...r.kernel.org,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Anup Patel <apatel@...tanamicro.com>
Subject: [PATCH v3 6/8] RISC-V: KVM: Add ONE_REG interface for AIA CSRs

We implement ONE_REG interface for AIA CSRs as a separate subtype
under the CSR ONE_REG interface.

Signed-off-by: Anup Patel <apatel@...tanamicro.com>
---
 arch/riscv/include/uapi/asm/kvm.h | 8 ++++++++
 arch/riscv/kvm/vcpu.c             | 8 ++++++++
 2 files changed, 16 insertions(+)

diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
index 182023dc9a51..cbc3e74fa670 100644
--- a/arch/riscv/include/uapi/asm/kvm.h
+++ b/arch/riscv/include/uapi/asm/kvm.h
@@ -79,6 +79,10 @@ struct kvm_riscv_csr {
 	unsigned long scounteren;
 };
 
+/* AIA CSR registers for KVM_GET_ONE_REG and KVM_SET_ONE_REG */
+struct kvm_riscv_aia_csr {
+};
+
 /* TIMER registers for KVM_GET_ONE_REG and KVM_SET_ONE_REG */
 struct kvm_riscv_timer {
 	__u64 frequency;
@@ -107,6 +111,7 @@ enum KVM_RISCV_ISA_EXT_ID {
 	KVM_RISCV_ISA_EXT_ZIHINTPAUSE,
 	KVM_RISCV_ISA_EXT_ZICBOM,
 	KVM_RISCV_ISA_EXT_ZBB,
+	KVM_RISCV_ISA_EXT_SSAIA,
 	KVM_RISCV_ISA_EXT_MAX,
 };
 
@@ -153,8 +158,11 @@ enum KVM_RISCV_SBI_EXT_ID {
 /* Control and status registers are mapped as type 3 */
 #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_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))
 
 /* 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 aca6b4fb7519..15507cd3a595 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -58,6 +58,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
 	[KVM_RISCV_ISA_EXT_I] = RISCV_ISA_EXT_i,
 	[KVM_RISCV_ISA_EXT_M] = RISCV_ISA_EXT_m,
 
+	KVM_ISA_EXT_ARR(SSAIA),
 	KVM_ISA_EXT_ARR(SSTC),
 	KVM_ISA_EXT_ARR(SVINVAL),
 	KVM_ISA_EXT_ARR(SVPBMT),
@@ -97,6 +98,7 @@ static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
 	case KVM_RISCV_ISA_EXT_C:
 	case KVM_RISCV_ISA_EXT_I:
 	case KVM_RISCV_ISA_EXT_M:
+	case KVM_RISCV_ISA_EXT_SSAIA:
 	case KVM_RISCV_ISA_EXT_SSTC:
 	case KVM_RISCV_ISA_EXT_SVINVAL:
 	case KVM_RISCV_ISA_EXT_ZIHINTPAUSE:
@@ -520,6 +522,9 @@ static int kvm_riscv_vcpu_get_reg_csr(struct kvm_vcpu *vcpu,
 	case KVM_REG_RISCV_CSR_GENERAL:
 		rc = kvm_riscv_vcpu_general_get_csr(vcpu, reg_num, &reg_val);
 		break;
+	case KVM_REG_RISCV_CSR_AIA:
+		rc = kvm_riscv_vcpu_aia_get_csr(vcpu, reg_num, &reg_val);
+		break;
 	default:
 		rc = -EINVAL;
 		break;
@@ -556,6 +561,9 @@ static int kvm_riscv_vcpu_set_reg_csr(struct kvm_vcpu *vcpu,
 	case KVM_REG_RISCV_CSR_GENERAL:
 		rc = kvm_riscv_vcpu_general_set_csr(vcpu, reg_num, reg_val);
 		break;
+	case KVM_REG_RISCV_CSR_AIA:
+		rc = kvm_riscv_vcpu_aia_set_csr(vcpu, reg_num, reg_val);
+		break;
 	default:
 		rc = -EINVAL;
 		break;
-- 
2.34.1