KVM: arm64: vgic-v2: Use cpuid from userspace as vcpu_id

When parsing a GICv2 attribute that contains a cpuid, handle this
as the vcpu_id, not a vcpu_idx, as userspace cannot really know
the mapping between the two. For this, use kvm_get_vcpu_by_id()
instead of kvm_get_vcpu().

Take this opportunity to get rid of the pointless check against
online_vcpus, which doesn't make much sense either, and switch
to FIELD_GET as a way to extract the vcpu_id.

Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230927090911.3355209-5-maz@kernel.org
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

diff --git a/arch/arm64/kvm/vgic/vgic-kvm-device.c b/arch/arm64/kvm/vgic/vgic-kvm-device.c
index 212b73a715c1c245540e12636085bb0d4ac1d741..c11962f901e0c8555cd8b62caa8435d32f38588f 100644 (file)
--- a/arch/arm64/kvm/vgic/vgic-kvm-device.c
+++ b/arch/arm64/kvm/vgic/vgic-kvm-device.c
@@ -339,13 +339,9 @@ int vgic_v2_parse_attr(struct kvm_device *dev, struct kvm_device_attr *attr,
 {
        int cpuid;
 
-       cpuid = (attr->attr & KVM_DEV_ARM_VGIC_CPUID_MASK) >>
-                KVM_DEV_ARM_VGIC_CPUID_SHIFT;
+       cpuid = FIELD_GET(KVM_DEV_ARM_VGIC_CPUID_MASK, attr->attr);
 
-       if (cpuid >= atomic_read(&dev->kvm->online_vcpus))
-               return -EINVAL;
-
-       reg_attr->vcpu = kvm_get_vcpu(dev->kvm, cpuid);
+       reg_attr->vcpu = kvm_get_vcpu_by_id(dev->kvm, cpuid);
        reg_attr->addr = attr->attr & KVM_DEV_ARM_VGIC_OFFSET_MASK;
 
        return 0;