linux-kernel - [PATCH 3/5] RISC-V: KVM: Allow bfloat16 extension for Guest/VM

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Message-Id: <effe218d368a37e397b6526f876b33322dbb6e20.1750164414.git.zhouquan@iscas.ac.cn>
Date: Tue, 17 Jun 2025 21:10:35 +0800
From: zhouquan@...as.ac.cn
To: anup@...infault.org,
	ajones@...tanamicro.com,
	atishp@...shpatra.org,
	paul.walmsley@...ive.com,
	palmer@...belt.com
Cc: linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	kvm@...r.kernel.org,
	kvm-riscv@...ts.infradead.org,
	Quan Zhou <zhouquan@...as.ac.cn>
Subject: [PATCH 3/5] RISC-V: KVM: Allow bfloat16 extension for Guest/VM

From: Quan Zhou <zhouquan@...as.ac.cn>

Extend the KVM ISA extension ONE_REG interface to allow KVM user space
to detect and enable Zfbmin/Zvfbfmin/Zvfbfwma extension for Guest/VM.

Signed-off-by: Quan Zhou <zhouquan@...as.ac.cn>
---
 arch/riscv/include/uapi/asm/kvm.h | 3 +++
 arch/riscv/kvm/vcpu_onereg.c      | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/arch/riscv/include/uapi/asm/kvm.h b/arch/riscv/include/uapi/asm/kvm.h
index 56959d277e86..79a5ac86597c 100644
--- a/arch/riscv/include/uapi/asm/kvm.h
+++ b/arch/riscv/include/uapi/asm/kvm.h
@@ -186,6 +186,9 @@ enum KVM_RISCV_ISA_EXT_ID {
 	KVM_RISCV_ISA_EXT_ZAAMO,
 	KVM_RISCV_ISA_EXT_ZALRSC,
 	KVM_RISCV_ISA_EXT_ZICBOP,
+	KVM_RISCV_ISA_EXT_ZFBFMIN,
+	KVM_RISCV_ISA_EXT_ZVFBFMIN,
+	KVM_RISCV_ISA_EXT_ZVFBFWMA,
 	KVM_RISCV_ISA_EXT_MAX,
 };
 
diff --git a/arch/riscv/kvm/vcpu_onereg.c b/arch/riscv/kvm/vcpu_onereg.c
index d444ec9e9e8e..2ba3f2c942ee 100644
--- a/arch/riscv/kvm/vcpu_onereg.c
+++ b/arch/riscv/kvm/vcpu_onereg.c
@@ -65,6 +65,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
 	KVM_ISA_EXT_ARR(ZCF),
 	KVM_ISA_EXT_ARR(ZCMOP),
 	KVM_ISA_EXT_ARR(ZFA),
+	KVM_ISA_EXT_ARR(ZFBFMIN),
 	KVM_ISA_EXT_ARR(ZFH),
 	KVM_ISA_EXT_ARR(ZFHMIN),
 	KVM_ISA_EXT_ARR(ZICBOM),
@@ -89,6 +90,8 @@ static const unsigned long kvm_isa_ext_arr[] = {
 	KVM_ISA_EXT_ARR(ZTSO),
 	KVM_ISA_EXT_ARR(ZVBB),
 	KVM_ISA_EXT_ARR(ZVBC),
+	KVM_ISA_EXT_ARR(ZVFBFMIN),
+	KVM_ISA_EXT_ARR(ZVFBFWMA),
 	KVM_ISA_EXT_ARR(ZVFH),
 	KVM_ISA_EXT_ARR(ZVFHMIN),
 	KVM_ISA_EXT_ARR(ZVKB),
@@ -170,6 +173,7 @@ static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
 	case KVM_RISCV_ISA_EXT_ZCF:
 	case KVM_RISCV_ISA_EXT_ZCMOP:
 	case KVM_RISCV_ISA_EXT_ZFA:
+	case KVM_RISCV_ISA_EXT_ZFBFMIN:
 	case KVM_RISCV_ISA_EXT_ZFH:
 	case KVM_RISCV_ISA_EXT_ZFHMIN:
 	case KVM_RISCV_ISA_EXT_ZICBOP:
@@ -192,6 +196,8 @@ static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
 	case KVM_RISCV_ISA_EXT_ZTSO:
 	case KVM_RISCV_ISA_EXT_ZVBB:
 	case KVM_RISCV_ISA_EXT_ZVBC:
+	case KVM_RISCV_ISA_EXT_ZVFBFMIN:
+	case KVM_RISCV_ISA_EXT_ZVFBFWMA:
 	case KVM_RISCV_ISA_EXT_ZVFH:
 	case KVM_RISCV_ISA_EXT_ZVFHMIN:
 	case KVM_RISCV_ISA_EXT_ZVKB:
-- 
2.34.1