VT-d Posted-Interrupts is an enhancement to CPU side Posted-Interrupt. With VT-d Posted-Interrupts enabled, external interrupts from direct-assigned devices can be delivered to guests without VMM intervention when guest is running in non-root mode.
You can find the VT-d Posted-Interrtups Spec. in the following URL: http://www.intel.com/content/www/us/en/intelligent-systems/intel-technology/vt-directed-io-spec.html Feng Wu (17): VT-d Posted-intterrupt (PI) design Add cmpxchg16b support for x86-64 iommu: Add iommu_intpost to control VT-d Posted-Interrupts feature vt-d: VT-d Posted-Interrupts feature detection vmx: Extend struct pi_desc to support VT-d Posted-Interrupts vmx: Add some helper functions for Posted-Interrupts vmx: Initialize VT-d Posted-Interrupts Descriptor vmx: Suppress posting interrupts when 'SN' is set VT-d: Remove pointless casts vt-d: Extend struct iremap_entry to support VT-d Posted-Interrupts vt-d: Add API to update IRTE when VT-d PI is used Update IRTE according to guest interrupt config changes vmx: posted-interrupt handling when vCPU is blocked vmx: Properly handle notification event when vCPU is running vmx: Add some scheduler hooks for VT-d posted interrupts VT-d: Dump the posted format IRTE Add a command line parameter for VT-d posted-interrupts docs/misc/vtd-pi.txt | 333 +++++++++++++++++++++++++++++++++ docs/misc/xen-command-line.markdown | 9 +- xen/arch/x86/domain.c | 11 ++ xen/arch/x86/hvm/vmx/vmcs.c | 21 +++ xen/arch/x86/hvm/vmx/vmx.c | 286 +++++++++++++++++++++++++++- xen/common/schedule.c | 2 + xen/drivers/passthrough/io.c | 124 +++++++++++- xen/drivers/passthrough/iommu.c | 16 +- xen/drivers/passthrough/vtd/intremap.c | 204 +++++++++++++++----- xen/drivers/passthrough/vtd/iommu.c | 17 +- xen/drivers/passthrough/vtd/iommu.h | 46 +++-- xen/drivers/passthrough/vtd/utils.c | 57 +++++- xen/include/asm-arm/domain.h | 2 + xen/include/asm-x86/domain.h | 3 + xen/include/asm-x86/hvm/hvm.h | 2 + xen/include/asm-x86/hvm/vmx/vmcs.h | 26 ++- xen/include/asm-x86/hvm/vmx/vmx.h | 28 +++ xen/include/asm-x86/iommu.h | 2 + xen/include/asm-x86/x86_64/system.h | 28 +++ xen/include/xen/iommu.h | 2 +- 20 files changed, 1140 insertions(+), 79 deletions(-) create mode 100644 docs/misc/vtd-pi.txt -- 2.1.0 _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
