From d51c978b7d3e143381f871d28d8a0437d446b51b Mon Sep 17 00:00:00 2001 From: Sascha Bischoff Date: Thu, 19 Mar 2026 15:59:50 +0000 Subject: KVM: arm64: gic-v5: Communicate userspace-driveable PPIs via a UAPI GICv5 systems will likely not support the full set of PPIs. The presence of any virtual PPI is tied to the presence of the physical PPI. Therefore, the available PPIs will be limited by the physical host. Userspace cannot drive any PPIs that are not implemented. Moreover, it is not desirable to expose all PPIs to the guest in the first place, even if they are supported in hardware. Some devices, such as the arch timer, are implemented in KVM, and hence those PPIs shouldn't be driven by userspace, either. Provided a new UAPI: KVM_DEV_ARM_VGIC_GRP_CTRL => KVM_DEV_ARM_VGIC_USERPSPACE_PPIs This allows userspace to query which PPIs it is able to drive via KVM_IRQ_LINE. Additionally, introduce a check in kvm_vm_ioctl_irq_line() to reject any PPIs not in the userspace mask. Signed-off-by: Sascha Bischoff Reviewed-by: Jonathan Cameron Link: https://patch.msgid.link/20260319154937.3619520-40-sascha.bischoff@arm.com Signed-off-by: Marc Zyngier --- tools/arch/arm64/include/uapi/asm/kvm.h | 1 + 1 file changed, 1 insertion(+) (limited to 'tools/arch') diff --git a/tools/arch/arm64/include/uapi/asm/kvm.h b/tools/arch/arm64/include/uapi/asm/kvm.h index a792a599b9d6..1c13bfa2d38a 100644 --- a/tools/arch/arm64/include/uapi/asm/kvm.h +++ b/tools/arch/arm64/include/uapi/asm/kvm.h @@ -428,6 +428,7 @@ enum { #define KVM_DEV_ARM_ITS_RESTORE_TABLES 2 #define KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES 3 #define KVM_DEV_ARM_ITS_CTRL_RESET 4 +#define KVM_DEV_ARM_VGIC_USERSPACE_PPIS 5 /* Device Control API on vcpu fd */ #define KVM_ARM_VCPU_PMU_V3_CTRL 0 -- cgit v1.2.3