linux-kernel - [PATCH 03/27] RISC-V: KVM: Check host Ssaia extension when creating AIA irqchip

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Message-ID: <20260120080013.2153519-4-anup.patel@oss.qualcomm.com>
Date: Tue, 20 Jan 2026 13:29:49 +0530
From: Anup Patel <anup.patel@....qualcomm.com>
To: Paolo Bonzini <pbonzini@...hat.com>, Atish Patra <atish.patra@...ux.dev>
Cc: Palmer Dabbelt <palmer@...belt.com>, Paul Walmsley <pjw@...nel.org>,
        Alexandre Ghiti <alex@...ti.fr>, Shuah Khan <shuah@...nel.org>,
        Anup Patel <anup@...infault.org>,
        Andrew Jones <andrew.jones@....qualcomm.com>,
        kvm-riscv@...ts.infradead.org, kvm@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Anup Patel <anup.patel@....qualcomm.com>
Subject: [PATCH 03/27] RISC-V: KVM: Check host Ssaia extension when creating AIA irqchip

The KVM user-space may create KVM AIA irqchip before checking
VCPU Ssaia extension availability so KVM AIA irqchip must fail
when host does not have Ssaia extension.

Fixes: 89d01306e34d ("RISC-V: KVM: Implement device interface for AIA irqchip")
Signed-off-by: Anup Patel <anup.patel@....qualcomm.com>
---
 arch/riscv/kvm/aia_device.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/riscv/kvm/aia_device.c b/arch/riscv/kvm/aia_device.c
index b195a93add1c..bed4d2c8c44c 100644
--- a/arch/riscv/kvm/aia_device.c
+++ b/arch/riscv/kvm/aia_device.c
@@ -11,6 +11,7 @@
 #include <linux/irqchip/riscv-imsic.h>
 #include <linux/kvm_host.h>
 #include <linux/uaccess.h>
+#include <linux/cpufeature.h>
 
 static int aia_create(struct kvm_device *dev, u32 type)
 {
@@ -22,6 +23,9 @@ static int aia_create(struct kvm_device *dev, u32 type)
 	if (irqchip_in_kernel(kvm))
 		return -EEXIST;
 
+	if (!riscv_isa_extension_available(NULL, SSAIA))
+		return -ENODEV;
+
 	ret = -EBUSY;
 	if (kvm_trylock_all_vcpus(kvm))
 		return ret;
-- 
2.43.0