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Subject[PATCH v3 00/16] kvm: x86: Support AMD SVM AVIC w/ in-kernel irqchip mode
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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(-)

--
1.8.3.1

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