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authorShuo Liu <shuo.a.liu@intel.com>2021-09-23 16:41:27 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-10-05 16:14:10 +0200
commit29a9f27574692a71c04fd41ca4bbf8eae842af13 (patch)
tree2a0df5a1bfa9322704c3e6576a42ff622bcecf3b /drivers/virt
parentc31bbc140b94d0e40481966d974038569051433e (diff)
virt: acrn: Introduce interfaces for MMIO device passthrough
MMIO device passthrough enables an OS in a virtual machine to directly access a MMIO device in the host. It promises almost the native performance, which is required in performance-critical scenarios of ACRN. HSM provides the following ioctls: - Assign - ACRN_IOCTL_ASSIGN_MMIODEV Pass data struct acrn_mmiodev from userspace to the hypervisor, and inform the hypervisor to assign a MMIO device to a User VM. - De-assign - ACRN_IOCTL_DEASSIGN_PCIDEV Pass data struct acrn_mmiodev from userspace to the hypervisor, and inform the hypervisor to de-assign a MMIO device from a User VM. These new APIs will be used by user space code vm_assign_mmiodev and vm_deassign_mmiodev in https://github.com/projectacrn/acrn-hypervisor/blob/master/devicemodel/core/vmmapi.c Signed-off-by: Shuo Liu <shuo.a.liu@intel.com> Signed-off-by: Fei Li <fei1.li@intel.com> Link: https://lore.kernel.org/r/20210923084128.18902-2-fei1.li@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/virt')
-rw-r--r--drivers/virt/acrn/hsm.c25
-rw-r--r--drivers/virt/acrn/hypercall.h26
2 files changed, 51 insertions, 0 deletions
diff --git a/drivers/virt/acrn/hsm.c b/drivers/virt/acrn/hsm.c
index 130e12b8652a..f567ca59d7c2 100644
--- a/drivers/virt/acrn/hsm.c
+++ b/drivers/virt/acrn/hsm.c
@@ -114,6 +114,7 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
struct acrn_ptdev_irq *irq_info;
struct acrn_ioeventfd ioeventfd;
struct acrn_vm_memmap memmap;
+ struct acrn_mmiodev *mmiodev;
struct acrn_msi_entry *msi;
struct acrn_pcidev *pcidev;
struct acrn_irqfd irqfd;
@@ -217,6 +218,30 @@ static long acrn_dev_ioctl(struct file *filp, unsigned int cmd,
ret = acrn_vm_memseg_unmap(vm, &memmap);
break;
+ case ACRN_IOCTL_ASSIGN_MMIODEV:
+ mmiodev = memdup_user((void __user *)ioctl_param,
+ sizeof(struct acrn_mmiodev));
+ if (IS_ERR(mmiodev))
+ return PTR_ERR(mmiodev);
+
+ ret = hcall_assign_mmiodev(vm->vmid, virt_to_phys(mmiodev));
+ if (ret < 0)
+ dev_dbg(acrn_dev.this_device,
+ "Failed to assign MMIO device!\n");
+ kfree(mmiodev);
+ break;
+ case ACRN_IOCTL_DEASSIGN_MMIODEV:
+ mmiodev = memdup_user((void __user *)ioctl_param,
+ sizeof(struct acrn_mmiodev));
+ if (IS_ERR(mmiodev))
+ return PTR_ERR(mmiodev);
+
+ ret = hcall_deassign_mmiodev(vm->vmid, virt_to_phys(mmiodev));
+ if (ret < 0)
+ dev_dbg(acrn_dev.this_device,
+ "Failed to deassign MMIO device!\n");
+ kfree(mmiodev);
+ break;
case ACRN_IOCTL_ASSIGN_PCIDEV:
pcidev = memdup_user((void __user *)ioctl_param,
sizeof(struct acrn_pcidev));
diff --git a/drivers/virt/acrn/hypercall.h b/drivers/virt/acrn/hypercall.h
index 0cfad05bd1a9..f0c78e52cebb 100644
--- a/drivers/virt/acrn/hypercall.h
+++ b/drivers/virt/acrn/hypercall.h
@@ -41,6 +41,8 @@
#define HC_RESET_PTDEV_INTR _HC_ID(HC_ID, HC_ID_PCI_BASE + 0x04)
#define HC_ASSIGN_PCIDEV _HC_ID(HC_ID, HC_ID_PCI_BASE + 0x05)
#define HC_DEASSIGN_PCIDEV _HC_ID(HC_ID, HC_ID_PCI_BASE + 0x06)
+#define HC_ASSIGN_MMIODEV _HC_ID(HC_ID, HC_ID_PCI_BASE + 0x07)
+#define HC_DEASSIGN_MMIODEV _HC_ID(HC_ID, HC_ID_PCI_BASE + 0x08)
#define HC_ID_PM_BASE 0x80UL
#define HC_PM_GET_CPU_STATE _HC_ID(HC_ID, HC_ID_PM_BASE + 0x00)
@@ -195,6 +197,30 @@ static inline long hcall_set_memory_regions(u64 regions_pa)
}
/**
+ * hcall_assign_mmiodev() - Assign a MMIO device to a User VM
+ * @vmid: User VM ID
+ * @addr: Service VM GPA of the &struct acrn_mmiodev
+ *
+ * Return: 0 on success, <0 on failure
+ */
+static inline long hcall_assign_mmiodev(u64 vmid, u64 addr)
+{
+ return acrn_hypercall2(HC_ASSIGN_MMIODEV, vmid, addr);
+}
+
+/**
+ * hcall_deassign_mmiodev() - De-assign a PCI device from a User VM
+ * @vmid: User VM ID
+ * @addr: Service VM GPA of the &struct acrn_mmiodev
+ *
+ * Return: 0 on success, <0 on failure
+ */
+static inline long hcall_deassign_mmiodev(u64 vmid, u64 addr)
+{
+ return acrn_hypercall2(HC_DEASSIGN_MMIODEV, vmid, addr);
+}
+
+/**
* hcall_assign_pcidev() - Assign a PCI device to a User VM
* @vmid: User VM ID
* @addr: Service VM GPA of the &struct acrn_pcidev