Messages in this thread |  | | Date | Tue, 12 Oct 2010 17:34:19 +0100 | From | Stefano Stabellini <> | Subject | [PATCH v4 0/7] PV on HVM: receive interrupts as xen events |
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Hi all, this patch series introduces some performance improvements for xen PV on HVM guests: interacting with the emulated APIC is slow because it causes traps in the hypervisor while receiving xen events using the vector callback mechanism allow us to skip all that. For this reason we remap interrupts and MSIs into xen pirqs so that from that point on we can receive them as xen events instead. This series is based on Konrad's pcifront series:
http://lkml.org/lkml/2010/10/12/207
and requires a patch to xen and a patch to qemu-xen (both sent to the list).
New changes in v4: - xen_hvm_register_pirq has been made static;
- the functions in arch/x86/pci/xen.c that depends on CONFIG_ACPI have been ifdef'ed.
The list of patches with diffstat follows:
Jeremy Fitzhardinge (2): acpi: use indirect call to register gsi in different modes xen: add xen hvm acpi_register_gsi variant
Stefano Stabellini (5): xen: support pirq != irq xen: get the maximum number of pirqs from xen xen: implement xen_hvm_register_pirq xen: support GSI -> pirq remapping in PV on HVM guests xen: map MSIs into pirqs
arch/x86/include/asm/acpi.h | 3 + arch/x86/include/asm/xen/pci.h | 5 ++ arch/x86/kernel/acpi/boot.c | 60 ++++++++++++++----- arch/x86/pci/xen.c | 117 +++++++++++++++++++++++++++++++++++++ drivers/xen/events.c | 120 ++++++++++++++++++++++++++++++++------ include/xen/events.h | 3 + include/xen/interface/features.h | 3 + include/xen/interface/physdev.h | 36 +++++++++++ 8 files changed, 311 insertions(+), 36 deletions(-)
A git tree with this series and Konrad's pcifront series on top of Linux 2.6.36-rc6 is available here:
git://xenbits.xen.org/people/sstabellini/linux-pvhvm.git 2.6.36-rc6-pvhvm-pirq-v4
Cheers,
Stefano Stabellini
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