RISC-V: KVM: Allow Zalasr extensions for Guest/VM

Extend the KVM ISA extension ONE_REG interface to allow KVM user space
to detect and enable Zalasr extensions for Guest/VM.

Signed-off-by: Xu Lu <luxu.kernel@bytedance.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20251020042457.30915-5-luxu.kernel@bytedance.com
Signed-off-by: Anup Patel <anup@brainfault.org>

Author: luxukernel

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

@@ -194,6 +194,7 @@ enum KVM_RISCV_ISA_EXT_ID {
 	KVM_RISCV_ISA_EXT_ZVFBFWMA,
 	KVM_RISCV_ISA_EXT_ZCLSD,
 	KVM_RISCV_ISA_EXT_ZILSD,
+	KVM_RISCV_ISA_EXT_ZALASR,
 	KVM_RISCV_ISA_EXT_MAX,
 };
 

arch/riscv/kvm/vcpu_onereg.c

@@ -50,6 +50,7 @@ static const unsigned long kvm_isa_ext_arr[] = {
 	KVM_ISA_EXT_ARR(ZAAMO),
 	KVM_ISA_EXT_ARR(ZABHA),
 	KVM_ISA_EXT_ARR(ZACAS),
+	KVM_ISA_EXT_ARR(ZALASR),
 	KVM_ISA_EXT_ARR(ZALRSC),
 	KVM_ISA_EXT_ARR(ZAWRS),
 	KVM_ISA_EXT_ARR(ZBA),
@@ -189,6 +190,7 @@ static bool kvm_riscv_vcpu_isa_disable_allowed(unsigned long ext)
 	case KVM_RISCV_ISA_EXT_ZAAMO:
 	case KVM_RISCV_ISA_EXT_ZABHA:
 	case KVM_RISCV_ISA_EXT_ZACAS:
+	case KVM_RISCV_ISA_EXT_ZALASR:
 	case KVM_RISCV_ISA_EXT_ZALRSC:
 	case KVM_RISCV_ISA_EXT_ZAWRS:
 	case KVM_RISCV_ISA_EXT_ZBA: