Re: [Xen-devel] [PATCH for-4.13 v3 0/2] x86/vmx: posted interrupt fixes

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Tue, Nov 26, 2019 at 02:26:46PM +0100, Roger Pau Monne wrote:
> Hello,
> 
> The following series aim to solve the issue reported by Joe Jin related
> to posted interrupts.

Regarding the release blockers email, and the qualification of this
series:

 - a regression introduced since 4.12

This is not a regression, since AFAICT the posted interrupt code has
always been like this.

 - a severe bug of a 4.13 feature

The bug seems to impact people using PCI-passthrough on Intel hardware
that supports posted interrupts (aka APICv). In my opinion, we either
fix it or disable APICv by default (now it's currently enabled by
default).

Thanks, Roger.

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