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

[Anup Patel]

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.pa...@oss.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