On 27/10/14 16:05, Boris Ostrovsky wrote: > Changes in v2: > * New version of cpuid.h file from Xen tree (with a couple of style > adjustments) > * Whitespace cleanup > > Currently HVM guests handle MSI interrupts using pirqs/event channels, > allowing > us to not issue APIC accesses that result in somewhat expensive VMEXITs. When > hardware supports APIC virtualization we don't need to use pirqs anymore > since now guest's APIC accesses can be handled by the processor itself. > > There are two patches in this series: > > 1. Move setting of x86_msi ops to a later point. The reason for doing so is > that > we currently decide whether or not to use pirqs before kernel had a chance to > see whether it should be using x2APIC instead of plain APIC. Since hardware > may > virtualize either or both of those two we can only make pirqs vs. APIC > selection > after kernel has settled down on which APIC version it will use. (Note that > currently x2APIC is not used by HVM guests so technically this patch is not > necessary. However, it probably makes sense to apply it now to avoid > forgetting to do it when we enable x2APIC). > > 2. Set x86_msi ops to use pirqs only when APIC virtualization is not > available. > The commit message describes performance improvements that this change brings. > > Boris Ostrovsky (2): > xen/pci: Defer initialization of MSI ops on HVM guests until after > x2APIC has been set up > xen/pci: Use APIC directly when APIC virtualization is supported by > hardware
Applied to devel/for-linus-3.19. Thanks. David -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
