KVM: Introduce direct MSI message injection for in-kernel irqchips (07975ad3) · Commits · 戴 / test

Documentation/virtual/kvm/api.txt

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		@@ -1689,6 +1689,27 @@ where the guest will clear the flag: when the soft lockup watchdog timer resets
		itself or when a soft lockup is detected. This ioctl can be called any time
		after pausing the vcpu, but before it is resumed.

		4.71 KVM_SIGNAL_MSI

		Capability: KVM_CAP_SIGNAL_MSI
		Architectures: x86
		Type: vm ioctl
		Parameters: struct kvm_msi (in)
		Returns: >0 on delivery, 0 if guest blocked the MSI, and -1 on error

		Directly inject a MSI message. Only valid with in-kernel irqchip that handles
		MSI messages.

		struct kvm_msi {
		__u32 address_lo;
		__u32 address_hi;
		__u32 data;
		__u32 flags;
		__u8 pad[16];
		};

		No flags are defined so far. The corresponding field must be 0.

		5. The kvm_run structure

		Application code obtains a pointer to the kvm_run structure by

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		@@ -36,6 +36,7 @@ config KVM
		select TASKSTATS
		select TASK_DELAY_ACCT
		select PERF_EVENTS
		select HAVE_KVM_MSI
		---help---
		Support hosting fully virtualized guest machines using hardware
		virtualization extensions. You will need a fairly recent

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		@@ -590,6 +590,7 @@ struct kvm_ppc_pvinfo {
		#define KVM_CAP_SYNC_REGS 74
		#define KVM_CAP_PCI_2_3 75
		#define KVM_CAP_KVMCLOCK_CTRL 76
		#define KVM_CAP_SIGNAL_MSI 77

		#ifdef KVM_CAP_IRQ_ROUTING

		@@ -715,6 +716,14 @@ struct kvm_one_reg {
		__u64 addr;
		};

		struct kvm_msi {
		__u32 address_lo;
		__u32 address_hi;
		__u32 data;
		__u32 flags;
		__u8 pad[16];
		};

		/*
		* ioctls for VM fds
		*/
		@@ -789,6 +798,8 @@ struct kvm_s390_ucas_mapping {
		/* Available with KVM_CAP_PCI_2_3 */
		#define KVM_ASSIGN_SET_INTX_MASK _IOW(KVMIO, 0xa4, \
		struct kvm_assigned_pci_dev)
		/* Available with KVM_CAP_SIGNAL_MSI */
		#define KVM_SIGNAL_MSI _IOW(KVMIO, 0xa5, struct kvm_msi)

		/*
		* ioctls for vcpu fds

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		@@ -802,6 +802,8 @@ int kvm_set_irq_routing(struct kvm *kvm,
		unsigned flags);
		void kvm_free_irq_routing(struct kvm *kvm);

		int kvm_send_userspace_msi(struct kvm kvm, struct kvm_msi msi);

		#else

		static inline void kvm_free_irq_routing(struct kvm *kvm) {}

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