linux-kernel - Re: [patch V2 00/17] entry: Provide generic implementation for host and guest entry/exit work

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Date:   Tue, 29 Oct 2019 11:28:07 +0000
From:   Will Deacon <will@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        linux-arch@...r.kernel.org, Mike Rapoport <rppt@...ux.ibm.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Miroslav Benes <mbenes@...e.cz>
Subject: Re: [patch V2 00/17] entry: Provide generic implementation for host
 and guest entry/exit work

Hi Thomas,

On Wed, Oct 23, 2019 at 02:27:05PM +0200, Thomas Gleixner wrote:
> When working on a way to move out the posix cpu timer expiry out of the
> timer interrupt context, I noticed that KVM is not handling pending task
> work before entering a guest. A quick hack was to add that to the x86 KVM
> handling loop. The discussion ended with a request to make this a generic
> infrastructure possible with also moving the per arch implementations of
> the enter from and return to user space handling generic.
> 
>   https://lore.kernel.org/r/89E42BCC-47A8-458B-B06A-D6A20D20512C@amacapital.net
> 
> The series implements the syscall enter/exit and the general exit to
> userspace work handling along with the pre guest enter functionality.
> 
> Changes vs. RFC version:
> 
>   - Dropped ARM64 conversion as requested by ARM64 folks

If you fancy another crack at arm64 on your way back from Lyon, we've now
got more of the asm->C conversion queued up here:

https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git/log/?h=for-next/entry-s-to-c

No worries if not, but figured it was worth letting you know anyway.

Will