Re: [Xen-devel] [PATCH 2/2] xen/pci: Use APIC directly when APIC virtualization is supported by hardware

2014-10-21 Thread Boris Ostrovsky
On 10/21/2014 03:10 PM, Andrew Cooper wrote: On 21/10/14 20:01, Boris Ostrovsky wrote: diff --git a/arch/x86/include/asm/xen/cpuid.h b/arch/x86/include/asm/xen/cpuid.h new file mode 100644 index 000..e57a457 --- /dev/null +++ b/arch/x86/include/asm/xen/cpuid.h @@ -0,0 +1,81 @@ +/***

Re: [Xen-devel] [PATCH 2/2] xen/pci: Use APIC directly when APIC virtualization is supported by hardware

2014-10-21 Thread Andrew Cooper
On 21/10/14 20:01, Boris Ostrovsky wrote: > When hardware supports APIC/x2APIC virtualization we don't need to use pirqs > for MSI handling and instead use APIC since most APIC accesses (MMIO or MSR) > will now be processed without VMEXITs. > > As an example, netperf on the original code produces t