The patch introduces function kvm_vfio_eeh_dev_unmap(), which is
expected to be called on IOCTL command issued to the VM device, in
order to tear down the address mapping for VFIO PCI device.
Signed-off-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
---
arch/powerpc/kernel/eeh_pe.c | 82 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/kvm_host.h | 7 ++++
2 files changed, 89 insertions(+)
diff --git a/arch/powerpc/kernel/eeh_pe.c b/arch/powerpc/kernel/eeh_pe.c
index 200cd5a..8398efc 100644
--- a/arch/powerpc/kernel/eeh_pe.c
+++ b/arch/powerpc/kernel/eeh_pe.c
@@ -420,6 +420,88 @@ int kvm_vfio_eeh_dev_map(struct kvm *kvm, int domain,
}
EXPORT_SYMBOL_GPL(kvm_vfio_eeh_dev_map);
+ /**
+ * kvm_vfio_eeh_dev_unmap - Tear down address mapping for VFIO PCI device
+ *
+ * @kvm: VM descriptor
+ * @domain: host domain
+ * @bdn: host bus/device/function number
+ *
+ * Tear down address mapping for VFIO PCI device.
+ */
+int kvm_vfio_eeh_dev_unmap(struct kvm *kvm, int domain, int bdn)
+{
+ struct pci_bus *bus;
+ struct pci_dev *dev;
+ struct eeh_pe *pe;
+ struct eeh_dev *edev, *tmp;
+ int bus_no, devfn;
+ bool passed;
+
+ /* Find the PCI device in host side */
+ bus_no = (bdn >> 8) & 0xff;
+ devfn = bdn & 0xff;
+ bus = pci_find_bus(domain, bus_no);
+ if (!bus) {
+ pr_warn("%s: PCI bus %04x:%02x not found\n",
+ __func__, domain, bus_no);
+ return -ENODEV;
+ }
+
+ dev = pci_get_slot(bus, devfn);
+ if (!dev) {
+ pr_warn("%s: PCI device %04x:%02x:%02x.%01x not found\n",
+ __func__, domain, bus_no,
+ PCI_SLOT(devfn), PCI_FUNC(devfn));
+ return -ENODEV;
+ }
+
+ /* Mark the EEH device as non-passed */
+ edev = pci_dev_to_eeh_dev(dev);
+ if (!edev) {
+ pr_warn("%s: No EEH dev for PCI device %s\n",
+ __func__, pci_name(dev));
+ return -ENODEV;
+ } else if (!eeh_dev_passed(edev) ||
+ !eeh_pe_passed(edev->pe) ||
+ edev->gaddr.kvm != kvm ||
+ edev->pe->gaddr.kvm != kvm) {
+ pr_warn("%s: Non-passsed PCI dev %s or PE\n",
+ __func__, pci_name(dev));
+ return 0;
+ }
+ memset(&edev->gaddr, 0, sizeof(edev->gaddr));
+ eeh_dev_set_passed(edev, false);
+ pr_debug("EEH: Host PCI device %s returned\n",
+ pci_name(dev));
+
+ /*
+ * Mark the PE as non-passed if all PCI devices
+ * except P2P bridges are non-passed.
+ */
+ pe = edev->pe;
+ passed = false;
+ eeh_pe_for_each_dev(pe, edev, tmp) {
+ dev = eeh_dev_to_pci_dev(edev);
+ if (dev && dev->subordinate)
+ continue;
+ if (eeh_dev_passed(edev)) {
+ passed = true;
+ break;
+ }
+ }
+
+ if (!passed) {
+ memset(&pe->gaddr, 0, sizeof(pe->gaddr));
+ eeh_pe_set_passed(pe, false);
+ pr_debug("EEH: PHB#%x-PE#%x returned to host\n",
+ pe->phb->global_number, pe->addr);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(kvm_vfio_eeh_dev_unmap);
+
static void *__kvmppc_eeh_vfio_release(void *data, void *flag)
{
struct eeh_pe *pe = (struct eeh_pe *)data;
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 294ce48..520b3d0 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -1106,14 +1106,21 @@ static inline void kvm_vcpu_set_dy_eligible(struct kvm_vcpu *vcpu, bool val)
#ifdef CONFIG_KVM_EEH
typedef int (*kvm_vfio_dev_eeh_map)(struct kvm *kvm, int domain,
int bdn, unsigned long buid, int gbdn);
+typedef int (*kvm_vfio_dev_eeh_unmap)(struct kvm *kvm, int domain, int bdn);
extern int kvm_vfio_eeh_dev_map(struct kvm *kvm, int domain,
int bdn, unsigned long buid, int gbdn);
+extern int kvm_vfio_eeh_dev_unmap(struct kvm *kvm, int domain, int bdn);
#else
static inline int kvm_vfio_eeh_dev_map(struct kvm *kvm, int domain,
int bdn, unsigned long buid, int gbdn)
{
return 0;
}
+
+static inline int kvm_vfio_eeh_dev_unmap(struct kvm *kvm, int domain, int bdn)
+{
+ return 0;
+}
#endif /* CONFIG_KVM_EEH */
#endif
--
1.8.3.2
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