linux-kernel - [PATCH 0/6] KVM/x86: Add workaround to support ExtINT with AVIC

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Date:   Fri, 22 Mar 2019 11:57:22 +0000
From:   "Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>
CC:     "joro@...tes.org" <joro@...tes.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "rkrcmar@...hat.com" <rkrcmar@...hat.com>,
        "Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>
Subject: [PATCH 0/6] KVM/x86: Add workaround to support ExtINT with AVIC

This series is one of the prerequisites for supporting AMD AVIC with
in-kernel irqchip (kernel_irqchip=on).

Since AVIC does not support ExtINT interrupt, which is required during
the booting phase of Windows and FreeBSD VMs (e.g. PIT -> PIC -> ExtInt).
This results in VM hang in the boot loader with kernel_irqchip=on mode.

This series provides workaround by temporary deactivate AVIC and fallback
to use legacy interrupt injection (w/ vINTR and interrupt window).
Then re-activate AVIC once the intrrupts are handled.

Thanks,
Suravee

Suravee Suthikulpanit (6):
  KVM: x86: Add callback functions for handling APIC ID, DFR and LDR
    update
  svm: Add AMD AVIC handlers for APIC ID, DFR and LDR update
  svm: Add support for APIC_ACCESS_PAGE_PRIVATE_MEMSLOT setup/destroy
  kvm: lapic: Add apicv activate/deactivate helper function
  KVM: x86: Add interface for run-time activate/de-activate APIC
    virtualization
  svm: Temporary deactivate AVIC during ExtINT handling

 arch/x86/include/asm/kvm_host.h |  11 ++++
 arch/x86/kvm/lapic.c            |  29 +++++++--
 arch/x86/kvm/lapic.h            |   1 +
 arch/x86/kvm/svm.c              | 106 ++++++++++++++++++++++++++++++--
 arch/x86/kvm/x86.c              |  48 +++++++++++++++
 5 files changed, 185 insertions(+), 10 deletions(-)

-- 
2.17.1