xen: Revert commits da72ff5bfcb0 and 72a9b186292d

[mirror_ubuntu-zesty-kernel.git] / drivers / xen / platform-pci.c

diff --git a/drivers/xen/platform-pci.c b/drivers/xen/platform-pci.c
index 2a165cc8a43cd6768529ffe48126c172e5b9f7df..1c4deac9b0f8529a4da44f792221d314ed12efe7 100644 (file)
--- a/drivers/xen/platform-pci.c
+++ b/drivers/xen/platform-pci.c
@@ -67,7 +67,7 @@ static uint64_t get_callback_via(struct pci_dev *pdev)
        pin = pdev->pin;
 
        /* We don't know the GSI. Specify the PCI INTx line instead. */
-       return ((uint64_t)0x01 << HVM_CALLBACK_VIA_TYPE_SHIFT) | /* PCI INTx identifier */
+       return ((uint64_t)0x01 << 56) | /* PCI INTx identifier */
                ((uint64_t)pci_domain_nr(pdev->bus) << 32) |
                ((uint64_t)pdev->bus->number << 16) |
                ((uint64_t)(pdev->devfn & 0xff) << 8) |
@@ -90,7 +90,7 @@ static int xen_allocate_irq(struct pci_dev *pdev)
 static int platform_pci_resume(struct pci_dev *pdev)
 {
        int err;
-       if (!xen_pv_domain())
+       if (xen_have_vector_callback)
                return 0;
        err = xen_set_callback_via(callback_via);
        if (err) {
@@ -138,14 +138,7 @@ static int platform_pci_probe(struct pci_dev *pdev,
        platform_mmio = mmio_addr;
        platform_mmiolen = mmio_len;
 
-       /* 
-        * Xen HVM guests always use the vector callback mechanism.
-        * L1 Dom0 in a nested Xen environment is a PV guest inside in an
-        * HVM environment. It needs the platform-pci driver to get
-        * notifications from L0 Xen, but it cannot use the vector callback
-        * as it is not exported by L1 Xen.
-        */
-       if (xen_pv_domain()) {
+       if (!xen_have_vector_callback) {
                ret = xen_allocate_irq(pdev);
                if (ret) {
                        dev_warn(&pdev->dev, "request_irq failed err=%d\n", ret);