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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>
This commit is contained in:
Shuo Liu 2021-02-07 11:10:34 +08:00 committed by Greg Kroah-Hartman
parent ce011e1363
commit c7cf8d2724
5 changed files with 138 additions and 0 deletions
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4
drivers/virt/acrn/acrn_drv.h
View File

@ -155,6 +155,7 @@ extern rwlock_t acrn_vm_list_lock;
* @ioreq_buf: I/O request shared buffer
* @ioreq_page: The page of the I/O request shared buffer
* @pci_conf_addr: Address of a PCI configuration access emulation
* @monitor_page: Page of interrupt statistics of User VM
*/
struct acrn_vm {
struct list_head list;
@ -170,6 +171,7 @@ struct acrn_vm {
struct acrn_io_request_buffer *ioreq_buf;
struct page *ioreq_page;
u32 pci_conf_addr;
struct page *monitor_page;
};
struct acrn_vm *acrn_vm_create(struct acrn_vm *vm,
@ -196,4 +198,6 @@ struct acrn_ioreq_client *acrn_ioreq_client_create(struct acrn_vm *vm,
const char *name);
void acrn_ioreq_client_destroy(struct acrn_ioreq_client *client);
int acrn_msi_inject(struct acrn_vm *vm, u64 msi_addr, u64 msi_data);
#endif /* __ACRN_HSM_DRV_H */

40
drivers/virt/acrn/hsm.c
View File

@ -51,7 +51,9 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
struct acrn_ioreq_notify notify;
struct acrn_ptdev_irq *irq_info;
struct acrn_vm_memmap memmap;
struct acrn_msi_entry *msi;
struct acrn_pcidev *pcidev;
struct page *page;
int i, ret = 0;
if (vm->vmid == ACRN_INVALID_VMID && cmd != ACRN_IOCTL_CREATE_VM) {
@ -198,6 +200,44 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
"Failed to reset intr for ptdev!\n");
kfree(irq_info);
break;
case ACRN_IOCTL_SET_IRQLINE:
ret = hcall_set_irqline(vm->vmid, ioctl_param);
if (ret < 0)
dev_dbg(acrn_dev.this_device,
"Failed to set interrupt line!\n");
break;
case ACRN_IOCTL_INJECT_MSI:
msi = memdup_user((void __user *)ioctl_param,
sizeof(struct acrn_msi_entry));
if (IS_ERR(msi))
return PTR_ERR(msi);
ret = hcall_inject_msi(vm->vmid, virt_to_phys(msi));
if (ret < 0)
dev_dbg(acrn_dev.this_device,
"Failed to inject MSI!\n");
kfree(msi);
break;
case ACRN_IOCTL_VM_INTR_MONITOR:
ret = pin_user_pages_fast(ioctl_param, 1,
FOLL_WRITE | FOLL_LONGTERM, &page);
if (unlikely(ret != 1)) {
dev_dbg(acrn_dev.this_device,
"Failed to pin intr hdr buffer!\n");
return -EFAULT;
}
ret = hcall_vm_intr_monitor(vm->vmid, page_to_phys(page));
if (ret < 0) {
unpin_user_page(page);
dev_dbg(acrn_dev.this_device,
"Failed to monitor intr data!\n");
return ret;
}
if (vm->monitor_page)
unpin_user_page(vm->monitor_page);
vm->monitor_page = page;
break;
case ACRN_IOCTL_CREATE_IOREQ_CLIENT:
if (vm->default_client)
return -EEXIST;

41
drivers/virt/acrn/hypercall.h
View File

@ -21,6 +21,11 @@
#define HC_RESET_VM _HC_ID(HC_ID, HC_ID_VM_BASE + 0x05)
#define HC_SET_VCPU_REGS _HC_ID(HC_ID, HC_ID_VM_BASE + 0x06)
#define HC_ID_IRQ_BASE 0x20UL
#define HC_INJECT_MSI _HC_ID(HC_ID, HC_ID_IRQ_BASE + 0x03)
#define HC_VM_INTR_MONITOR _HC_ID(HC_ID, HC_ID_IRQ_BASE + 0x04)
#define HC_SET_IRQLINE _HC_ID(HC_ID, HC_ID_IRQ_BASE + 0x05)
#define HC_ID_IOREQ_BASE 0x30UL
#define HC_SET_IOREQ_BUFFER _HC_ID(HC_ID, HC_ID_IOREQ_BASE + 0x00)
#define HC_NOTIFY_REQUEST_FINISH _HC_ID(HC_ID, HC_ID_IOREQ_BASE + 0x01)
@ -101,6 +106,42 @@ static inline long hcall_set_vcpu_regs(u64 vmid, u64 regs_state)
return acrn_hypercall2(HC_SET_VCPU_REGS, vmid, regs_state);
}
/**
* hcall_inject_msi() - Deliver a MSI interrupt to a User VM
* @vmid: User VM ID
* @msi: Service VM GPA of MSI message
*
* Return: 0 on success, <0 on failure
*/
static inline long hcall_inject_msi(u64 vmid, u64 msi)
{
return acrn_hypercall2(HC_INJECT_MSI, vmid, msi);
}
/**
* hcall_vm_intr_monitor() - Set a shared page for User VM interrupt statistics
* @vmid: User VM ID
* @addr: Service VM GPA of the shared page
*
* Return: 0 on success, <0 on failure
*/
static inline long hcall_vm_intr_monitor(u64 vmid, u64 addr)
{
return acrn_hypercall2(HC_VM_INTR_MONITOR, vmid, addr);
}
/**
* hcall_set_irqline() - Set or clear an interrupt line
* @vmid: User VM ID
* @op: Service VM GPA of interrupt line operations
*
* Return: 0 on success, <0 on failure
*/
static inline long hcall_set_irqline(u64 vmid, u64 op)
{
return acrn_hypercall2(HC_SET_IRQLINE, vmid, op);
}
/**
* hcall_set_ioreq_buffer() - Set up the shared buffer for I/O Requests.
* @vmid: User VM ID

36
drivers/virt/acrn/vm.c
View File

@ -68,6 +68,10 @@ int acrn_vm_destroy(struct acrn_vm *vm)
write_unlock_bh(&acrn_vm_list_lock);
acrn_ioreq_deinit(vm);
if (vm->monitor_page) {
put_page(vm->monitor_page);
vm->monitor_page = NULL;
}
ret = hcall_destroy_vm(vm->vmid);
if (ret < 0) {
@ -83,3 +87,35 @@ int acrn_vm_destroy(struct acrn_vm *vm)
vm->vmid = ACRN_INVALID_VMID;
return 0;
}
/**
* acrn_inject_msi() - Inject a MSI interrupt into a User VM
* @vm: User VM
* @msi_addr: The MSI address
* @msi_data: The MSI data
*
* Return: 0 on success, <0 on error
*/
int acrn_msi_inject(struct acrn_vm *vm, u64 msi_addr, u64 msi_data)
{
struct acrn_msi_entry *msi;
int ret;
/* might be used in interrupt context, so use GFP_ATOMIC */
msi = kzalloc(sizeof(*msi), GFP_ATOMIC);
if (!msi)
return -ENOMEM;
/*
* msi_addr: addr[19:12] with dest vcpu id
* msi_data: data[7:0] with vector
*/
msi->msi_addr = msi_addr;
msi->msi_data = msi_data;
ret = hcall_inject_msi(vm->vmid, virt_to_phys(msi));
if (ret < 0)
dev_err(acrn_dev.this_device,
"Failed to inject MSI to VM %u!\n", vm->vmid);
kfree(msi);
return ret;
}

17
include/uapi/linux/acrn.h
View File

@ -417,6 +417,16 @@ struct acrn_pcidev {
__u32 bar[ACRN_PCI_NUM_BARS];
};
/**
* struct acrn_msi_entry - Info for injecting a MSI interrupt to a VM
* @msi_addr: MSI addr[19:12] with dest vCPU ID
* @msi_data: MSI data[7:0] with vector
*/
struct acrn_msi_entry {
__u64 msi_addr;
__u64 msi_data;
};
/* The ioctl type, documented in ioctl-number.rst */
#define ACRN_IOCTL_TYPE 0xA2
@ -436,6 +446,13 @@ struct acrn_pcidev {
#define ACRN_IOCTL_SET_VCPU_REGS \
_IOW(ACRN_IOCTL_TYPE, 0x16, struct acrn_vcpu_regs)
#define ACRN_IOCTL_INJECT_MSI \
_IOW(ACRN_IOCTL_TYPE, 0x23, struct acrn_msi_entry)
#define ACRN_IOCTL_VM_INTR_MONITOR \
_IOW(ACRN_IOCTL_TYPE, 0x24, unsigned long)
#define ACRN_IOCTL_SET_IRQLINE \
_IOW(ACRN_IOCTL_TYPE, 0x25, __u64)
#define ACRN_IOCTL_NOTIFY_REQUEST_FINISH \
_IOW(ACRN_IOCTL_TYPE, 0x31, struct acrn_ioreq_notify)
#define ACRN_IOCTL_CREATE_IOREQ_CLIENT \