[PATCH v8 3/5] RISC-V: KVM: Add Svade and Svadu Extensions Support for Guest/VM

[Yong-Xuan Wang]

We extend the KVM ISA extension ONE_REG interface to allow VMM tools to
detect and enable Svade and Svadu extensions for Guest/VM. Since the
henvcfg.ADUE is read-only zero if the menvcfg.ADUE is zero, the Svadu
extension is available for Guest/VM and the Svade extension is allowed
to disabledonly when arch_has_hw_pte_young() is true.

Signed-off-by: Yong-Xuan Wang <yongxuan.wang@xxxxxxxxxx>
Reviewed-by: Andrew Jones <ajones@xxxxxxxxxxxxxxxx>
Reviewed-by: Samuel Holland <samuel.holland@xxxxxxxxxx>
---
 arch/riscv/include/uapi/asm/kvm.h |  2 ++
 arch/riscv/kvm/vcpu.c             |  4 ++++
 arch/riscv/kvm/vcpu_onereg.c      | 15 +++++++++++++++
 3 files changed, 21 insertions(+)

diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
index e97db3296456..85bbc472989d 100644
--- a/arch/riscv/include/uapi/asm/kvm.h
+++ b/arch/riscv/include/uapi/asm/kvm.h
@@ -175,6 +175,8 @@ enum KVM_RISCV_ISA_EXT_ID {
 	KVM_RISCV_ISA_EXT_ZCF,
 	KVM_RISCV_ISA_EXT_ZCMOP,
 	KVM_RISCV_ISA_EXT_ZAWRS,
+	KVM_RISCV_ISA_EXT_SVADE,
+	KVM_RISCV_ISA_EXT_SVADU,
 	KVM_RISCV_ISA_EXT_MAX,
 };
 
diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index 8d7d381737ee..c78061a6d68b 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -544,6 +544,10 @@ static void kvm_riscv_vcpu_setup_config(struct kvm_vcpu *vcpu)
 	if (riscv_isa_extension_available(isa, ZICBOZ))
 		cfg->henvcfg |= ENVCFG_CBZE;
 
+	if (riscv_isa_extension_available(isa, SVADU) &&
+	    !riscv_isa_extension_available(isa, SVADE))
+		cfg->henvcfg |= ENVCFG_ADUE;
+
 	if (riscv_has_extension_unlikely(RISCV_ISA_EXT_SMSTATEEN)) {
 		cfg->hstateen0 |= SMSTATEEN0_HSENVCFG;
 		if (riscv_isa_extension_available(isa, SSAIA))
diff --git a/arch/riscv/kvm/vcpu_onereg.c b/arch/riscv/kvm/vcpu_onereg.c
index b319c4c13c54..b3f58908902a 100644
--- a/arch/riscv/kvm/vcpu_onereg.c
+++ b/arch/riscv/kvm/vcpu_onereg.c
@@ -15,6 +15,7 @@
 #include <asm/cacheflush.h>
 #include <asm/cpufeature.h>
 #include <asm/kvm_vcpu_vector.h>
+#include <asm/pgtable.h>
 #include <asm/vector.h>
 
 #define KVM_RISCV_BASE_ISA_MASK		GENMASK(25, 0)
@@ -38,6 +39,8 @@ static const unsigned long kvm_isa_ext_arr[] = {
 	KVM_ISA_EXT_ARR(SSAIA),
 	KVM_ISA_EXT_ARR(SSCOFPMF),
 	KVM_ISA_EXT_ARR(SSTC),
+	KVM_ISA_EXT_ARR(SVADE),
+	KVM_ISA_EXT_ARR(SVADU),
 	KVM_ISA_EXT_ARR(SVINVAL),
 	KVM_ISA_EXT_ARR(SVNAPOT),
 	KVM_ISA_EXT_ARR(SVPBMT),
@@ -110,6 +113,12 @@ static bool kvm_riscv_vcpu_isa_enable_allowed(unsigned long ext)
 	case KVM_RISCV_ISA_EXT_SSCOFPMF:
 		/* Sscofpmf depends on interrupt filtering defined in ssaia */
 		return __riscv_isa_extension_available(NULL, RISCV_ISA_EXT_SSAIA);
+	case KVM_RISCV_ISA_EXT_SVADU:
+		/*
+		 * The henvcfg.ADUE is read-only zero if menvcfg.ADUE is zero.
+		 * Guest OS can use Svadu only when host OS enable Svadu.
+		 */
+		return arch_has_hw_pte_young();
 	case KVM_RISCV_ISA_EXT_V:
 		return riscv_v_vstate_ctrl_user_allowed();
 	default:
@@ -181,6 +190,12 @@ static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
 	/* Extensions which can be disabled using Smstateen */
 	case KVM_RISCV_ISA_EXT_SSAIA:
 		return riscv_has_extension_unlikely(RISCV_ISA_EXT_SMSTATEEN);
+	case KVM_RISCV_ISA_EXT_SVADE:
+		/*
+		 * The henvcfg.ADUE is read-only zero if menvcfg.ADUE is zero.
+		 * Svade is not allowed to disable when the platform use Svade.
+		 */
+		return arch_has_hw_pte_young();
 	default:
 		break;
 	}
-- 
2.17.1