diff options
Diffstat (limited to 'arch/x86/pci/xen.c')
| -rw-r--r-- | arch/x86/pci/xen.c | 31 |
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; } |