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authorLinus Torvalds <torvalds@linux-foundation.org>2014-12-11 18:15:33 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-11 18:15:33 -0800
commit9d050966e2eb37a643ac15904b6a8fda7fcfabe9 (patch)
treef3a6f9cc93f6dde2e0cd6f4114b8258afb596bc1 /arch/x86/pci
parentc0222ac086669a631814bbf857f8c8023452a4d7 (diff)
parent4ef8e3f3504808621e594f01852476a1d4e7ef93 (diff)
Merge tag 'stable/for-linus-3.19-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen features and fixes from David Vrabel: - Fully support non-coherent devices on ARM by introducing the mechanisms to request the hypervisor to perform the required cache maintainance operations. - A number of pciback bug fixes and cleanups. Notably a deadlock fix if a PCI device was manually uunbound and a fix for incorrectly restoring state after a function reset. - In x86 PVHVM guests, use the APIC for interrupts if this has been virtualized by the hardware. This reduces the number of interrupt- related VM exits on such hardware. * tag 'stable/for-linus-3.19-rc0-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip: (26 commits) Revert "swiotlb-xen: pass dev_addr to swiotlb_tbl_unmap_single" xen/pci: Use APIC directly when APIC virtualization hardware is available xen/pci: Defer initialization of MSI ops on HVM guests xen-pciback: drop SR-IOV VFs when PF driver unloads xen/pciback: Restore configuration space when detaching from a guest. PCI: Expose pci_load_saved_state for public consumption. xen/pciback: Remove tons of dereferences xen/pciback: Print out the domain owning the device. xen/pciback: Include the domain id if removing the device whilst still in use driver core: Provide an wrapper around the mutex to do lockdep warnings xen/pciback: Don't deadlock when unbinding. swiotlb-xen: pass dev_addr to swiotlb_tbl_unmap_single swiotlb-xen: call xen_dma_sync_single_for_device when appropriate swiotlb-xen: remove BUG_ON in xen_bus_to_phys swiotlb-xen: pass dev_addr to xen_dma_unmap_page and xen_dma_sync_single_for_cpu xen/arm: introduce GNTTABOP_cache_flush xen/arm/arm64: introduce xen_arch_need_swiotlb xen/arm/arm64: merge xen/mm32.c into xen/mm.c xen/arm: use hypercall to flush caches in map_page xen: add a dma_addr_t dev_addr argument to xen_dma_map_page ...
Diffstat (limited to 'arch/x86/pci')
-rw-r--r--arch/x86/pci/xen.c31
1 files changed, 29 insertions, 2 deletions
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 1819a91bbb9f..c489ef2c1a39 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -23,6 +23,8 @@
#include <xen/features.h>
#include <xen/events.h>
#include <asm/xen/pci.h>
+#include <asm/xen/cpuid.h>
+#include <asm/apic.h>
#include <asm/i8259.h>
static int xen_pcifront_enable_irq(struct pci_dev *dev)
@@ -423,6 +425,28 @@ int __init pci_xen_init(void)
return 0;
}
+#ifdef CONFIG_PCI_MSI
+void __init xen_msi_init(void)
+{
+ if (!disable_apic) {
+ /*
+ * If hardware supports (x2)APIC virtualization (as indicated
+ * by hypervisor's leaf 4) then we don't need to use pirqs/
+ * event channels for MSI handling and instead use regular
+ * APIC processing
+ */
+ uint32_t eax = cpuid_eax(xen_cpuid_base() + 4);
+
+ if (((eax & XEN_HVM_CPUID_X2APIC_VIRT) && x2apic_mode) ||
+ ((eax & XEN_HVM_CPUID_APIC_ACCESS_VIRT) && cpu_has_apic))
+ return;
+ }
+
+ x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
+ x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
+}
+#endif
+
int __init pci_xen_hvm_init(void)
{
if (!xen_have_vector_callback || !xen_feature(XENFEAT_hvm_pirqs))
@@ -437,8 +461,11 @@ int __init pci_xen_hvm_init(void)
#endif
#ifdef CONFIG_PCI_MSI
- x86_msi.setup_msi_irqs = xen_hvm_setup_msi_irqs;
- x86_msi.teardown_msi_irq = xen_teardown_msi_irq;
+ /*
+ * We need to wait until after x2apic is initialized
+ * before we can set MSI IRQ ops.
+ */
+ x86_platform.apic_post_init = xen_msi_init;
#endif
return 0;
}