From: "rkrcmar@redhat.com" <rkrcmar@redhat.com>
To: "Suthikulpanit, Suravee" <Suravee.Suthikulpanit@amd.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"joro@8bytes.org" <joro@8bytes.org>,
"pbonzini@redhat.com" <pbonzini@redhat.com>
Subject: Re: [PATCH 0/6] KVM/x86: Add workaround to support ExtINT with AVIC
Date: Thu, 4 Apr 2019 23:30:03 +0200 [thread overview]
Message-ID: <20190404213001.GA21138@flask> (raw)
In-Reply-To: <20190322115702.10166-1-suravee.suthikulpanit@amd.com>
2019-03-22 11:57+0000, Suthikulpanit, Suravee:
> 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.
The solution looks reasonable (although it seems dangerous to me) as we
only enable the workaround if the interrupt cannot be immediately
injected.
The interesting part is that split irqchip works, yet it cannot inject
ExtInt correctly either -- does the guest OS behave differently, or does
split irqchip just ignore the ExtInt?
Thanks.
next prev parent reply other threads:[~2019-04-04 21:30 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-22 11:57 [PATCH 0/6] KVM/x86: Add workaround to support ExtINT with AVIC Suthikulpanit, Suravee
2019-03-22 11:57 ` [PATCH 1/6] KVM: x86: Add callback functions for handling APIC ID, DFR and LDR update Suthikulpanit, Suravee
2019-07-03 21:16 ` Paolo Bonzini
2019-07-17 19:44 ` Suthikulpanit, Suravee
2019-03-22 11:57 ` [PATCH 2/6] svm: Add AMD AVIC handlers for " Suthikulpanit, Suravee
2019-03-22 11:57 ` [PATCH 3/6] svm: Add support for APIC_ACCESS_PAGE_PRIVATE_MEMSLOT setup/destroy Suthikulpanit, Suravee
2019-05-08 19:14 ` Jan H. Schönherr
2019-06-30 16:19 ` Suthikulpanit, Suravee
2019-03-22 11:57 ` [PATCH 4/6] kvm: lapic: Add apicv activate/deactivate helper function Suthikulpanit, Suravee
2019-05-08 22:27 ` Jan H. Schönherr
2019-07-15 22:35 ` Suthikulpanit, Suravee
2019-03-22 11:57 ` [PATCH 5/6] KVM: x86: Add interface for run-time activate/de-activate APIC virtualization Suthikulpanit, Suravee
2019-05-08 20:45 ` Jan H. Schönherr
2019-03-22 11:57 ` [PATCH 6/6] svm: Temporary deactivate AVIC during ExtINT handling Suthikulpanit, Suravee
2019-05-08 17:37 ` Jan H. Schönherr
2019-06-03 18:58 ` Suthikulpanit, Suravee
2019-04-04 21:30 ` rkrcmar [this message]
2019-04-04 22:06 ` [PATCH 0/6] KVM/x86: Add workaround to support ExtINT with AVIC rkrcmar
2019-04-04 22:06 ` rkrcmar
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