RISC-V: KVM: Allow bfloat16 extension for Guest/VM

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

Signed-off-by: Quan Zhou <zhouquan@iscas.ac.cn>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Reviewed-by: Nutty Liu <nutty.liu@hotmail.com>
Reviewed-by: Nutty Liu <liujingqi@lanxincomputing.com>
Link: https://lore.kernel.org/r/f846cecd330ab9fc88211c55bc73126f903f8713.1754646071.git.zhouquan@iscas.ac.cn
Signed-off-by: Anup Patel <anup@brainfault.org>

Author: zcxGGmu

arch/riscv/include/uapi/asm/kvm.h

@@ -187,6 +187,9 @@ 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,
 };
 

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),
@@ -199,6 +202,7 @@ 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:
@@ -221,6 +225,8 @@ 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: