linux-kernel - [PATCH v5 3/4] RISC-V: KVM: Add Svade and Svadu Extensions Support for Guest/VM

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Message-Id: <20240605121512.32083-4-yongxuan.wang@sifive.com>
Date: Wed,  5 Jun 2024 20:15:09 +0800
From: Yong-Xuan Wang <yongxuan.wang@...ive.com>
To: linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	kvm-riscv@...ts.infradead.org,
	kvm@...r.kernel.org
Cc: apatel@...tanamicro.com,
	alex@...ti.fr,
	ajones@...tanamicro.com,
	greentime.hu@...ive.com,
	vincent.chen@...ive.com,
	Yong-Xuan Wang <yongxuan.wang@...ive.com>,
	Anup Patel <anup@...infault.org>,
	Atish Patra <atishp@...shpatra.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>
Subject: [PATCH v5 3/4] RISC-V: KVM: Add Svade and Svadu Extensions Support for Guest/VM

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 only when arch_has_hw_pte_young()
is true.

Signed-off-by: Yong-Xuan Wang <yongxuan.wang@...ive.com>
---
 arch/riscv/include/uapi/asm/kvm.h | 2 ++
 arch/riscv/kvm/vcpu.c             | 6 ++++++
 arch/riscv/kvm/vcpu_onereg.c      | 6 ++++++
 3 files changed, 14 insertions(+)

diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
index e878e7cc3978..a5e0c35d7e9a 100644
--- a/arch/riscv/include/uapi/asm/kvm.h
+++ b/arch/riscv/include/uapi/asm/kvm.h
@@ -168,6 +168,8 @@ enum KVM_RISCV_ISA_EXT_ID {
 	KVM_RISCV_ISA_EXT_ZTSO,
 	KVM_RISCV_ISA_EXT_ZACAS,
 	KVM_RISCV_ISA_EXT_SSCOFPMF,
+	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 17e21df36cc1..21edd60c4756 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -540,6 +540,12 @@ 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))
+		cfg->henvcfg |= ENVCFG_ADUE;
+
+	if (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 c676275ea0a0..06e930f1e206 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),
@@ -105,6 +108,9 @@ static bool kvm_riscv_vcpu_isa_enable_allowed(unsigned long ext)
 		return __riscv_isa_extension_available(NULL, RISCV_ISA_EXT_SSAIA);
 	case KVM_RISCV_ISA_EXT_V:
 		return riscv_v_vstate_ctrl_user_allowed();
+	case KVM_RISCV_ISA_EXT_SVADU:
+		/* The henvcfg.ADUE is read-only zero if menvcfg.ADUE is zero. */
+		return arch_has_hw_pte_young();
 	default:
 		break;
 	}
-- 
2.17.1