linux-kernel - Re: [PART2 PATCH v5 00/12] iommu/AMD: Introduce IOMMU AVIC support

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Date:	Mon, 8 Aug 2016 21:42:36 +0700
From:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
To:	<rkrcmar@...hat.com>, <joro@...tes.org>, <pbonzini@...hat.com>,
	<alex.williamson@...hat.com>
CC:	<kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<sherry.hurwitz@....com>
Subject: Re: [PART2 PATCH v5 00/12] iommu/AMD: Introduce IOMMU AVIC support

Hi Joerg/Radim/Paolo,

Are there any other concerns about this series?

Thanks,
Suravee

On 7/25/16 16:31, Suravee Suthikulpanit wrote:
> From: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
>
> CHANGES FROM V4
> ===============
>   * Remove the hash look up in the amd_iommu_update_ga() (see patch 7/12).
>     Instead, use per-vcpu pi_list to keep track of posted interrupts so that
>     SVM can directly update IOMMU interrupt remapping table entries directly
>     when rescheduling VCPUs. (see patch 8/12 and 12/12)(per Radim's suggestion)
>
>   * Re-implement AVIC VM-ID using a set of bit-mask to ensure no ID conflict
>     between active VMs. (see patch 10/12)
>
>   * Verify VM-ID of the hash entry in avic_ga_log_notifier() before referencing
>     each per-VM data structure. (see patch 11/12) (per Radim's suggestion)
>
> GITHUB
> ======
> Latest git tree can be found at:
>     http://github.com/ssuthiku/linux.git    avic_part2_v5
>
> OVERVIEW
> ========
> This patch set is the second part of the two-part patch series to introduce
> the new AMD Advance Virtual Interrupt Controller (AVIC) support.
>
> In addition to the SVM AVIC, AMD IOMMU also extends the AVIC capability
> to allow I/O interrupts injection directly into the virtualized guest
> local APIC without the need for hypervisor intervention.
>
> This patch series introduces a new hardware interrupt remapping (IR) mode
> in AMD IOMMU driver, the Guest Virtual APIC (GA) mode. This is in contrast
> to the existing "legacy" mode. The IR mode can be specified with a new
> kernel parameter:
>
>     amd_iommu_guest_ir=[vapic (default) | legacy]
>
> When enabling GA mode, the AMD IOMMU driver will configure device interrupt
> remapping in GA mode when possible (i.e. SVM AVIC must be enabled, and if
> the interrupt types are supported). Otherewise, the driver will fallback
> to using the legacy IR mode.
>
> This patch series also introduces new interfaces between SVM and IOMMU
> to allow:
>   * SVM driver to communicate to IOMMU with updated vcpu scheduling
>     information.
>   * IOMMU driver to notify SVM driver to schedule vcpu on to physical core
>     handle IOMMU GALog entry.
>
> DOCUMENTATIONS
> ==============
> More information about SVM AVIC can be found in the
> AMD64 Architecture Programmer’s Manual Volume 2 - System Programming.
>
>     http://support.amd.com/TechDocs/24593.pdf
>
> More information about IOMMU AVIC can be found int the
> AMD I/O Virtualization Technology (IOMMU) Specification - Rev 2.62.
>
>     http://support.amd.com/TechDocs/48882_IOMMU.pdf
>
> Any feedback and comments are very much appreciated.
>
> Thank you,
> Suravee
>
> Suravee Suthikulpanit (12):
>   iommu/amd: Detect and enable guest vAPIC support
>   iommu/amd: Move and introduce new IRTE-related unions and structures
>   iommu/amd: Introduce interrupt remapping ops structure
>   iommu/amd: Add support for multiple IRTE formats
>   iommu/amd: Detect and initialize guest vAPIC log
>   iommu/amd: Adding GALOG interrupt handler
>   iommu/amd: Introduce amd_iommu_update_ga()
>   iommu/amd: Implements irq_set_vcpu_affinity() hook to setup vapic mode
>     for pass-through devices
>   iommu/amd: Enable vAPIC interrupt remapping mode by default
>   svm: Introduces AVIC per-VM ID
>   svm: Introduce AMD IOMMU avic_ga_log_notifier
>   svm: Implements update_pi_irte hook to setup posted interrupt
>
>  arch/x86/include/asm/kvm_host.h |   2 +
>  arch/x86/kvm/svm.c              | 381 +++++++++++++++++++++++++++++-
>  drivers/iommu/amd_iommu.c       | 501 +++++++++++++++++++++++++++++++++++-----
>  drivers/iommu/amd_iommu_init.c  | 183 ++++++++++++++-
>  drivers/iommu/amd_iommu_proto.h |   1 +
>  drivers/iommu/amd_iommu_types.h | 151 ++++++++++++
>  include/linux/amd-iommu.h       |  42 +++-
>  7 files changed, 1191 insertions(+), 70 deletions(-)
>