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virt: acrn: Introduce interrupt injection interfaces
ACRN userspace need to inject virtual interrupts into a User VM in devices emulation. HSM needs provide interfaces to do so. Introduce following interrupt injection interfaces: ioctl ACRN_IOCTL_SET_IRQLINE: Pass data from userspace to the hypervisor, and inform the hypervisor to inject a virtual IOAPIC GSI interrupt to a User VM. ioctl ACRN_IOCTL_INJECT_MSI: Pass data struct acrn_msi_entry from userspace to the hypervisor, and inform the hypervisor to inject a virtual MSI to a User VM. ioctl ACRN_IOCTL_VM_INTR_MONITOR: Set a 4-Kbyte aligned shared page for statistics information of interrupts of a User VM. Cc: Zhi Wang <zhi.a.wang@intel.com> Cc: Zhenyu Wang <zhenyuw@linux.intel.com> Cc: Yu Wang <yu1.wang@intel.com> Cc: Reinette Chatre <reinette.chatre@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Zhi Wang <zhi.a.wang@intel.com> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: Shuo Liu <shuo.a.liu@intel.com> Link: https://lore.kernel.org/r/20210207031040.49576-13-shuo.a.liu@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -155,6 +155,7 @@ extern rwlock_t acrn_vm_list_lock;
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* @ioreq_buf: I/O request shared buffer
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* @ioreq_page: The page of the I/O request shared buffer
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* @pci_conf_addr: Address of a PCI configuration access emulation
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* @monitor_page: Page of interrupt statistics of User VM
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*/
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struct acrn_vm {
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struct list_head list;
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@ -170,6 +171,7 @@ struct acrn_vm {
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struct acrn_io_request_buffer *ioreq_buf;
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struct page *ioreq_page;
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u32 pci_conf_addr;
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struct page *monitor_page;
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};
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struct acrn_vm *acrn_vm_create(struct acrn_vm *vm,
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@ -196,4 +198,6 @@ struct acrn_ioreq_client *acrn_ioreq_client_create(struct acrn_vm *vm,
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const char *name);
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void acrn_ioreq_client_destroy(struct acrn_ioreq_client *client);
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int acrn_msi_inject(struct acrn_vm *vm, u64 msi_addr, u64 msi_data);
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#endif /* __ACRN_HSM_DRV_H */
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@ -51,7 +51,9 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
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struct acrn_ioreq_notify notify;
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struct acrn_ptdev_irq *irq_info;
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struct acrn_vm_memmap memmap;
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struct acrn_msi_entry *msi;
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struct acrn_pcidev *pcidev;
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struct page *page;
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int i, ret = 0;
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if (vm->vmid == ACRN_INVALID_VMID && cmd != ACRN_IOCTL_CREATE_VM) {
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@ -198,6 +200,44 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
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"Failed to reset intr for ptdev!\n");
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kfree(irq_info);
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break;
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case ACRN_IOCTL_SET_IRQLINE:
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ret = hcall_set_irqline(vm->vmid, ioctl_param);
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if (ret < 0)
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dev_dbg(acrn_dev.this_device,
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"Failed to set interrupt line!\n");
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break;
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case ACRN_IOCTL_INJECT_MSI:
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msi = memdup_user((void __user *)ioctl_param,
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sizeof(struct acrn_msi_entry));
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if (IS_ERR(msi))
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return PTR_ERR(msi);
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ret = hcall_inject_msi(vm->vmid, virt_to_phys(msi));
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if (ret < 0)
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dev_dbg(acrn_dev.this_device,
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"Failed to inject MSI!\n");
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kfree(msi);
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break;
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case ACRN_IOCTL_VM_INTR_MONITOR:
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ret = pin_user_pages_fast(ioctl_param, 1,
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FOLL_WRITE | FOLL_LONGTERM, &page);
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if (unlikely(ret != 1)) {
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dev_dbg(acrn_dev.this_device,
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"Failed to pin intr hdr buffer!\n");
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return -EFAULT;
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}
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ret = hcall_vm_intr_monitor(vm->vmid, page_to_phys(page));
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if (ret < 0) {
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unpin_user_page(page);
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dev_dbg(acrn_dev.this_device,
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"Failed to monitor intr data!\n");
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return ret;
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}
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if (vm->monitor_page)
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unpin_user_page(vm->monitor_page);
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vm->monitor_page = page;
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break;
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case ACRN_IOCTL_CREATE_IOREQ_CLIENT:
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if (vm->default_client)
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return -EEXIST;
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@ -21,6 +21,11 @@
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#define HC_RESET_VM _HC_ID(HC_ID, HC_ID_VM_BASE + 0x05)
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#define HC_SET_VCPU_REGS _HC_ID(HC_ID, HC_ID_VM_BASE + 0x06)
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#define HC_ID_IRQ_BASE 0x20UL
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#define HC_INJECT_MSI _HC_ID(HC_ID, HC_ID_IRQ_BASE + 0x03)
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#define HC_VM_INTR_MONITOR _HC_ID(HC_ID, HC_ID_IRQ_BASE + 0x04)
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#define HC_SET_IRQLINE _HC_ID(HC_ID, HC_ID_IRQ_BASE + 0x05)
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#define HC_ID_IOREQ_BASE 0x30UL
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#define HC_SET_IOREQ_BUFFER _HC_ID(HC_ID, HC_ID_IOREQ_BASE + 0x00)
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#define HC_NOTIFY_REQUEST_FINISH _HC_ID(HC_ID, HC_ID_IOREQ_BASE + 0x01)
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@ -101,6 +106,42 @@ static inline long hcall_set_vcpu_regs(u64 vmid, u64 regs_state)
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return acrn_hypercall2(HC_SET_VCPU_REGS, vmid, regs_state);
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}
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/**
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* hcall_inject_msi() - Deliver a MSI interrupt to a User VM
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* @vmid: User VM ID
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* @msi: Service VM GPA of MSI message
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*
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* Return: 0 on success, <0 on failure
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*/
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static inline long hcall_inject_msi(u64 vmid, u64 msi)
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{
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return acrn_hypercall2(HC_INJECT_MSI, vmid, msi);
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}
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/**
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* hcall_vm_intr_monitor() - Set a shared page for User VM interrupt statistics
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* @vmid: User VM ID
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* @addr: Service VM GPA of the shared page
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*
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* Return: 0 on success, <0 on failure
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*/
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static inline long hcall_vm_intr_monitor(u64 vmid, u64 addr)
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{
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return acrn_hypercall2(HC_VM_INTR_MONITOR, vmid, addr);
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}
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/**
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* hcall_set_irqline() - Set or clear an interrupt line
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* @vmid: User VM ID
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* @op: Service VM GPA of interrupt line operations
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*
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* Return: 0 on success, <0 on failure
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*/
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static inline long hcall_set_irqline(u64 vmid, u64 op)
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{
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return acrn_hypercall2(HC_SET_IRQLINE, vmid, op);
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}
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/**
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* hcall_set_ioreq_buffer() - Set up the shared buffer for I/O Requests.
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* @vmid: User VM ID
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@ -68,6 +68,10 @@ int acrn_vm_destroy(struct acrn_vm *vm)
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write_unlock_bh(&acrn_vm_list_lock);
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acrn_ioreq_deinit(vm);
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if (vm->monitor_page) {
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put_page(vm->monitor_page);
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vm->monitor_page = NULL;
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}
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ret = hcall_destroy_vm(vm->vmid);
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if (ret < 0) {
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@ -83,3 +87,35 @@ int acrn_vm_destroy(struct acrn_vm *vm)
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vm->vmid = ACRN_INVALID_VMID;
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return 0;
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}
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/**
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* acrn_inject_msi() - Inject a MSI interrupt into a User VM
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* @vm: User VM
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* @msi_addr: The MSI address
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* @msi_data: The MSI data
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*
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* Return: 0 on success, <0 on error
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*/
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int acrn_msi_inject(struct acrn_vm *vm, u64 msi_addr, u64 msi_data)
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{
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struct acrn_msi_entry *msi;
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int ret;
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/* might be used in interrupt context, so use GFP_ATOMIC */
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msi = kzalloc(sizeof(*msi), GFP_ATOMIC);
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if (!msi)
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return -ENOMEM;
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/*
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* msi_addr: addr[19:12] with dest vcpu id
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* msi_data: data[7:0] with vector
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*/
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msi->msi_addr = msi_addr;
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msi->msi_data = msi_data;
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ret = hcall_inject_msi(vm->vmid, virt_to_phys(msi));
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if (ret < 0)
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dev_err(acrn_dev.this_device,
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"Failed to inject MSI to VM %u!\n", vm->vmid);
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kfree(msi);
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return ret;
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}
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@ -417,6 +417,16 @@ struct acrn_pcidev {
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__u32 bar[ACRN_PCI_NUM_BARS];
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};
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/**
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* struct acrn_msi_entry - Info for injecting a MSI interrupt to a VM
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* @msi_addr: MSI addr[19:12] with dest vCPU ID
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* @msi_data: MSI data[7:0] with vector
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*/
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struct acrn_msi_entry {
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__u64 msi_addr;
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__u64 msi_data;
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};
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/* The ioctl type, documented in ioctl-number.rst */
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#define ACRN_IOCTL_TYPE 0xA2
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@ -436,6 +446,13 @@ struct acrn_pcidev {
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#define ACRN_IOCTL_SET_VCPU_REGS \
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_IOW(ACRN_IOCTL_TYPE, 0x16, struct acrn_vcpu_regs)
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#define ACRN_IOCTL_INJECT_MSI \
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_IOW(ACRN_IOCTL_TYPE, 0x23, struct acrn_msi_entry)
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#define ACRN_IOCTL_VM_INTR_MONITOR \
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_IOW(ACRN_IOCTL_TYPE, 0x24, unsigned long)
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#define ACRN_IOCTL_SET_IRQLINE \
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_IOW(ACRN_IOCTL_TYPE, 0x25, __u64)
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#define ACRN_IOCTL_NOTIFY_REQUEST_FINISH \
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_IOW(ACRN_IOCTL_TYPE, 0x31, struct acrn_ioreq_notify)
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#define ACRN_IOCTL_CREATE_IOREQ_CLIENT \
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