linux-kernel - [PATCH 2/2] RISC-V: KVM: Add Svadu Extension Support for Guest/VM

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Date:   Fri, 15 Sep 2023 08:26:58 +0000
From:   Yong-Xuan Wang <yongxuan.wang@...ive.com>
To:     linux-riscv@...ts.infradead.org, kvm-riscv@...ts.infradead.org
Cc:     greentime.hu@...ive.com, vincent.chen@...ive.com, tjytimi@....com,
        alex@...ti.fr, 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>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] RISC-V: KVM: Add Svadu Extension Support for Guest/VM

We extend the KVM ISA extension ONE_REG interface to allow VMM
tools  to detect and enable Svadu extension for Guest/VM.

Also set the HADE bit in henvcfg CSR if Svadu extension is
available for Guest/VM.

Signed-off-by: Yong-Xuan Wang <yongxuan.wang@...ive.com>
---
 arch/riscv/include/uapi/asm/kvm.h | 1 +
 arch/riscv/kvm/vcpu.c             | 3 +++
 arch/riscv/kvm/vcpu_onereg.c      | 1 +
 3 files changed, 5 insertions(+)

diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
index 992c5e407104..3c7a6c762d0f 100644
--- a/arch/riscv/include/uapi/asm/kvm.h
+++ b/arch/riscv/include/uapi/asm/kvm.h
@@ -131,6 +131,7 @@ enum KVM_RISCV_ISA_EXT_ID {
 	KVM_RISCV_ISA_EXT_ZICSR,
 	KVM_RISCV_ISA_EXT_ZIFENCEI,
 	KVM_RISCV_ISA_EXT_ZIHPM,
+	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 82229db1ce73..91b92a1f4e33 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -487,6 +487,9 @@ static void kvm_riscv_vcpu_update_config(const unsigned long *isa)
 	if (riscv_isa_extension_available(isa, ZICBOZ))
 		henvcfg |= ENVCFG_CBZE;
 
+	if (riscv_isa_extension_available(isa, SVADU))
+		henvcfg |= ENVCFG_HADE;
+
 	csr_write(CSR_HENVCFG, henvcfg);
 #ifdef CONFIG_32BIT
 	csr_write(CSR_HENVCFGH, henvcfg >> 32);
diff --git a/arch/riscv/kvm/vcpu_onereg.c b/arch/riscv/kvm/vcpu_onereg.c
index 1b7e9fa265cb..211915dad677 100644
--- a/arch/riscv/kvm/vcpu_onereg.c
+++ b/arch/riscv/kvm/vcpu_onereg.c
@@ -36,6 +36,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
 	/* Multi letter extensions (alphabetically sorted) */
 	KVM_ISA_EXT_ARR(SSAIA),
 	KVM_ISA_EXT_ARR(SSTC),
+	KVM_ISA_EXT_ARR(SVADU),
 	KVM_ISA_EXT_ARR(SVINVAL),
 	KVM_ISA_EXT_ARR(SVNAPOT),
 	KVM_ISA_EXT_ARR(SVPBMT),
-- 
2.17.1