linux-kernel - [PATCH v2 0/3] KVM: SVM: Fix guest not booting w/ AVIC enabled

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Message-Id: <1505230962-86304-1-git-send-email-suravee.suthikulpanit@amd.com>
Date:   Tue, 12 Sep 2017 10:42:39 -0500
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     pbonzini@...hat.com, rkrcmar@...hat.com, joro@...tes.org,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: [PATCH v2 0/3] KVM: SVM: Fix guest not booting w/ AVIC enabled

Certain QEMU options fails to boot VM guest w/ SVM AVIC enabled
(e.g. modprobe kvm_amd avic=1). Investigation shows that this mainly
due to AVIC hardware does not trap into hypervisor when guest OS
writes to APIC_EOI register. 

The boot hang is caused by missing timer interrupt when using in-kernel
PIT model (e.g. launch qemu w/ '-no-hpet' option) since it requires
irq acknowledgmen before injecting another interrupt in case
irq re-injection is enabled (normally default).

Changes from V1 (https://lkml.org/lkml/2017/9/5/826)
 * Consolidate irqchip_split() check to only one place (per Radim). 

Suravee Suthikulpanit (3):
  KVM: SVM: Refactor AVIC vcpu initialization into avic_init_vcpu()
  KVM: Add struct kvm_vcpu pointer parameter to get_enable_apicv()
  KVM: SVM: Add irqchip_split() checks before enabling AVIC

 arch/x86/include/asm/kvm_host.h |  2 +-
 arch/x86/kvm/svm.c              | 43 ++++++++++++++++++++++++++++-------------
 arch/x86/kvm/vmx.c              |  2 +-
 arch/x86/kvm/x86.c              |  2 +-
 4 files changed, 33 insertions(+), 16 deletions(-)

-- 
1.8.3.1