linux-kernel - [PATCH 2/4] RISC-V: KVM: Fix riscv_vcpu_get_isa_ext

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Date:   Mon, 18 Sep 2023 23:36:44 +0530
From:   Anup Patel <apatel@...tanamicro.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Atish Patra <atishp@...shpatra.org>,
        Shuah Khan <shuah@...nel.org>
Cc:     Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Andrew Jones <ajones@...tanamicro.com>, kvm@...r.kernel.org,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Anup Patel <apatel@...tanamicro.com>
Subject: [PATCH 2/4] RISC-V: KVM: Fix riscv_vcpu_get_isa_ext_single() for missing extensions

The riscv_vcpu_get_isa_ext_single() should fail with -ENOENT error
when corresponding ISA extension is not available on the host.

Fixes: e98b1085be79 ("RISC-V: KVM: Factor-out ONE_REG related code to its own source file")
Signed-off-by: Anup Patel <apatel@...tanamicro.com>
---
 arch/riscv/kvm/vcpu_onereg.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/kvm/vcpu_onereg.c b/arch/riscv/kvm/vcpu_onereg.c
index e7e833ced91b..b7e0e03c69b1 100644
--- a/arch/riscv/kvm/vcpu_onereg.c
+++ b/arch/riscv/kvm/vcpu_onereg.c
@@ -460,8 +460,11 @@ static int riscv_vcpu_get_isa_ext_single(struct kvm_vcpu *vcpu,
 	    reg_num >= ARRAY_SIZE(kvm_isa_ext_arr))
 		return -ENOENT;
 
-	*reg_val = 0;
 	host_isa_ext = kvm_isa_ext_arr[reg_num];
+	if (!__riscv_isa_extension_available(NULL, host_isa_ext))
+		return -ENOENT;
+
+	*reg_val = 0;
 	if (__riscv_isa_extension_available(vcpu->arch.isa, host_isa_ext))
 		*reg_val = 1; /* Mark the given extension as available */
 
-- 
2.34.1