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| author | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2010-06-24 17:50:18 +0100 |
|---|---|---|
| committer | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2010-10-22 21:25:42 +0100 |
| commit | 3942b740e5183caad47a4a3fcb37a4509ce7af83 (patch) | |
| tree | 7051ecaaca2eadbc68743b4697add53f64d9401d | |
| parent | 90f6881e6430ea7b38b9e0f9837719b1935616e0 (diff) | |
| download | linux-3942b740e5183caad47a4a3fcb37a4509ce7af83.tar.gz linux-3942b740e5183caad47a4a3fcb37a4509ce7af83.tar.bz2 linux-3942b740e5183caad47a4a3fcb37a4509ce7af83.zip | |
xen: support GSI -> pirq remapping in PV on HVM guests
Disable pcifront when running on HVM: it is meant to be used with pv
guests that don't have PCI bus.
Use acpi_register_gsi_xen_hvm to remap GSIs into pirqs.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
| -rw-r--r-- | arch/x86/include/asm/xen/pci.h | 5 | ||||
| -rw-r--r-- | arch/x86/pci/xen.c | 16 | ||||
| -rw-r--r-- | drivers/xen/events.c | 6 | ||||
| -rw-r--r-- | include/xen/interface/features.h | 3 |
4 files changed, 29 insertions, 1 deletions
diff --git a/arch/x86/include/asm/xen/pci.h b/arch/x86/include/asm/xen/pci.h index 449c82f71677..f89a42aff284 100644 --- a/arch/x86/include/asm/xen/pci.h +++ b/arch/x86/include/asm/xen/pci.h @@ -3,10 +3,15 @@ #if defined(CONFIG_PCI_XEN) extern int __init pci_xen_init(void); +extern int __init pci_xen_hvm_init(void); #define pci_xen 1 #else #define pci_xen 0 #define pci_xen_init (0) +static inline int pci_xen_hvm_init(void) +{ + return -1; +} #endif #if defined(CONFIG_PCI_MSI) diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c index 3a4ab0b4dcca..d5284c491aef 100644 --- a/arch/x86/pci/xen.c +++ b/arch/x86/pci/xen.c @@ -14,6 +14,7 @@ #include <asm/xen/hypervisor.h> +#include <xen/features.h> #include <xen/events.h> #include <asm/xen/pci.h> @@ -184,3 +185,18 @@ int __init pci_xen_init(void) #endif return 0; } + +int __init pci_xen_hvm_init(void) +{ + if (!xen_feature(XENFEAT_hvm_pirqs)) + return 0; + +#ifdef CONFIG_ACPI + /* + * We don't want to change the actual ACPI delivery model, + * just how GSIs get registered. + */ + __acpi_register_gsi = acpi_register_gsi_xen_hvm; +#endif + return 0; +} diff --git a/drivers/xen/events.c b/drivers/xen/events.c index 239b011ef56f..32269bcbd88c 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -623,7 +623,8 @@ int xen_map_pirq_gsi(unsigned pirq, unsigned gsi, int shareable, char *name) /* If we are a PV guest, we don't have GSIs (no ACPI passed). Therefore * we are using the !xen_initial_domain() to drop in the function.*/ - if (identity_mapped_irq(gsi) || !xen_initial_domain()) { + if (identity_mapped_irq(gsi) || (!xen_initial_domain() && + xen_pv_domain())) { irq = gsi; irq_alloc_desc_at(irq, 0); } else @@ -1397,6 +1398,9 @@ void __init xen_init_IRQ(void) if (xen_hvm_domain()) { xen_callback_vector(); native_init_IRQ(); + /* pci_xen_hvm_init must be called after native_init_IRQ so that + * __acpi_register_gsi can point at the right function */ + pci_xen_hvm_init(); } else { irq_ctx_init(smp_processor_id()); } diff --git a/include/xen/interface/features.h b/include/xen/interface/features.h index 70d2563ab166..b6ca39a069d8 100644 --- a/include/xen/interface/features.h +++ b/include/xen/interface/features.h @@ -47,6 +47,9 @@ /* x86: pvclock algorithm is safe to use on HVM */ #define XENFEAT_hvm_safe_pvclock 9 +/* x86: pirq can be used by HVM guests */ +#define XENFEAT_hvm_pirqs 10 + #define XENFEAT_NR_SUBMAPS 1 #endif /* __XEN_PUBLIC_FEATURES_H__ */ |