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SubjectRe: [PATCH v3 00/16] kvm: x86: Support AMD SVM AVIC w/ in-kernel irqchip mode
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Hi All,

Are there other concerns or suggestions for this series?

Thanks,
Suravee

On 9/13/19 2:00 PM, Suthikulpanit, Suravee wrote:
> The 'commit 67034bb9dd5e ("KVM: SVM: Add irqchip_split() checks before
> enabling AVIC")' was introduced to fix miscellaneous boot-hang issues
> when enable AVIC. This is mainly due to AVIC hardware doest not #vmexit
> on write to LAPIC EOI register resulting in-kernel PIC and IOAPIC to
> wait and do not inject new interrupts (e.g. PIT, RTC).
>
> This limits AVIC to only work with kernel_irqchip=split mode, which is
> not currently enabled by default, and also required user-space to
> support split irqchip model, which might not be the case.
>
> The goal of this series is to enable AVIC to work in both irqchip modes,
> by allowing AVIC to be deactivated temporarily during runtime, and fallback
> to legacy interrupt injection mode (w/ vINTR and interrupt windows)
> when needed, and then re-enabled subsequently.
>
> Similar approach is also used to handle Hyper-V SynIC in the
> 'commit 5c919412fe61 ("kvm/x86: Hyper-V synthetic interrupt controller")',
> where APICv is permanently disabled at runtime (currently broken for
> AVIC, and fixed by this series).
>
> This series contains three parts:
> * Part 1: patch 1-2
> Introduce APICv state enum and logic for keeping track of the state
> for each vm.
>
> * Part 2: patch 3-11
> Add support for activate/deactivate APICv at runtime
>
> * Part 3: patch 12-16:
> Provide workaround for AVIC EOI and allow enable AVIC w/
> kernel_irqchip=on
>
> Pre-requisite Patch:
> * commit b9c6ff94e43a ("iommu/amd: Re-factor guest virtual APIC
> (de-)activation code")
> (https://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git/commit/
> ?h=next&id=b9c6ff94e43a0ee053e0c1d983fba1ac4953b762)
>
> This series has been tested against v5.3-rc5 as following:
> * Booting Linux and Windows Server 2019 VMs upto 240 vcpus
> and FreeBSD upto 128 vcpus w/ qemu option "kernel-irqchip=on"
> and "-no-hpet".
> * Pass-through Intel 10GbE NIC and run netperf in the VM.
>
> Changes from V2: (https://lkml.org/lkml/2019/8/15/672)
> * Rebase to v5.3-rc5
> * Misc changes recommended by Alex and Vitaly.
> * Rename APICV_DEACTIVATED to APICV_SUSPENDED
> * Disable AVIC when guest booting w/ SVM support since AVIC
> does not currently support guest w/ nested virt.
> * Add tracepoint for APICV activate/deactivate request. (per Alex)
> * Consolidate changes for handling EOI for kvm PIT emulation and
> IOAPIC RTC handling in V2 into ioapic_lazy_update_eoi() in
> patch 17/18 of v3 serie.
> * Remove patches for providing per-vm apicv_state debug information.
>
> Changes from V1: (https://lkml.org/lkml/2019/3/22/1042)
> * Introduce APICv state enumeration
> * Introduce KVM debugfs for APICv state
> * Add synchronization logic for APICv state to prevent potential
> race condition (per Jan's suggestion)
> * Add support for activate/deactivate posted interrupt
> (per Jan's suggestion)
> * Remove callback functions for handling APIC ID, DFR and LDR update
> (per Paolo's suggestion)
> * Add workaround for handling EOI for in-kernel PIT and IOAPIC.
>
> Suravee Suthikulpanit (16):
> kvm: x86: Modify kvm_x86_ops.get_enable_apicv() to use struct kvm
> parameter
> kvm: x86: Introduce KVM APICv state
> kvm: lapic: Introduce APICv update helper function
> kvm: x86: Add support for activate/de-activate APICv at runtime
> kvm: x86: Add APICv activate/deactivate request trace points
> kvm: x86: svm: Add support to activate/deactivate posted interrupts
> svm: Add support for setup/destroy virutal APIC backing page for AVIC
> svm: Add support for activate/deactivate AVIC at runtime
> kvm: x86: hyperv: Use APICv deactivate request interface
> svm: Disable AVIC when launching guest with SVM support
> svm: Temporary deactivate AVIC during ExtINT handling
> kvm: x86: Introduce struct kvm_x86_ops.apicv_eoi_accelerate
> kvm: lapic: Clean up APIC predefined macros
> kvm: ioapic: Refactor kvm_ioapic_update_eoi()
> kvm: x86: ioapic: Lazy update IOAPIC EOI
> svm: Allow AVIC with in-kernel irqchip mode
>
> arch/x86/include/asm/kvm_host.h | 28 +++++-
> arch/x86/kvm/hyperv.c | 12 ++-
> arch/x86/kvm/ioapic.c | 149 +++++++++++++++++++-----------
> arch/x86/kvm/lapic.c | 35 ++++---
> arch/x86/kvm/lapic.h | 2 +
> arch/x86/kvm/svm.c | 198 +++++++++++++++++++++++++++++++++++++---
> arch/x86/kvm/trace.h | 30 ++++++
> arch/x86/kvm/vmx/vmx.c | 2 +-
> arch/x86/kvm/x86.c | 136 ++++++++++++++++++++++++++-
> 9 files changed, 506 insertions(+), 86 deletions(-)
>
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