[PATCH v6 34/49] KVM: arm64: gic-v5: Add VGICv5 IST save/restore UAPI

[Sascha Bischoff <Sascha.Bischoff@arm.com>]

Introduce KVM_DEV_ARM_VGIC_GRP_IST as the VGICv5 device attribute
group used to transfer SPI and LPI IST state between KVM and userspace
during migration.

The group uses struct kvm_vgic_v5_ist as a descriptor for the
userspace-owned SPI and LPI IST buffers. Each buffer contains the
architected 32-bit ISTE state for the corresponding interrupt number
space, while the host IST layout remains private to KVM.

The descriptor is architecture-specific, as it is only the payload of
an ARM VGIC device attribute.

Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com>
---
 arch/arm64/include/uapi/asm/kvm.h       | 9 +++++++++
 tools/arch/arm64/include/uapi/asm/kvm.h | 9 +++++++++
 2 files changed, 18 insertions(+)

diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
index 8a023ab54bff9..65ee09bd14636 100644
--- a/arch/arm64/include/uapi/asm/kvm.h
+++ b/arch/arm64/include/uapi/asm/kvm.h
@@ -424,6 +424,15 @@ enum {
 #define KVM_DEV_ARM_VGIC_GRP_ITS_REGS 8
 #define KVM_DEV_ARM_VGIC_GRP_MAINT_IRQ  9
 #define KVM_DEV_ARM_VGIC_GRP_IRS_REGS	10
+#define KVM_DEV_ARM_VGIC_GRP_IST	11
+
+struct kvm_vgic_v5_ist {
+	__u64	spi_ist_addr;
+	__u64	spi_ist_size;
+	__u64	lpi_ist_addr;
+	__u64	lpi_ist_size;
+};
+
 #define KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT	10
 #define KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_MASK \
 			(0x3fffffULL << KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT)
diff --git a/tools/arch/arm64/include/uapi/asm/kvm.h b/tools/arch/arm64/include/uapi/asm/kvm.h
index 710a0d267347d..9998252ea8ec8 100644
--- a/tools/arch/arm64/include/uapi/asm/kvm.h
+++ b/tools/arch/arm64/include/uapi/asm/kvm.h
@@ -423,6 +423,15 @@ enum {
 #define KVM_DEV_ARM_VGIC_GRP_ITS_REGS 8
 #define KVM_DEV_ARM_VGIC_GRP_MAINT_IRQ  9
 #define KVM_DEV_ARM_VGIC_GRP_IRS_REGS	10
+#define KVM_DEV_ARM_VGIC_GRP_IST	11
+
+struct kvm_vgic_v5_ist {
+	__u64	spi_ist_addr;
+	__u64	spi_ist_size;
+	__u64	lpi_ist_addr;
+	__u64	lpi_ist_size;
+};
+
 #define KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT	10
 #define KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_MASK \
 			(0x3fffffULL << KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT)
-- 
2.34.1