linux-kernel - Re: [PATCH] x86/tsx: fix KVM guest live migration for tsx=on

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Message-ID: <e800ba74-0ff6-8d98-8978-62c02cf1f8ea@intel.com>
Date:   Mon, 11 Apr 2022 16:45:23 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Jon Kohler <jon@...anix.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>, Tony Luck <tony.luck@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Borislav Petkov <bp@...e.de>,
        Neelima Krishnan <neelima.krishnan@...el.com>,
        "kvm @ vger . kernel . org" <kvm@...r.kernel.org>
Subject: Re: [PATCH] x86/tsx: fix KVM guest live migration for tsx=on

On 4/11/22 12:35, Jon Kohler wrote:
> Also, while I’ve got you, I’d also like to send out a patch to simply
> force abort all transactions even when tsx=on, and just be done with
> TSX. Now that we’ve had the patch that introduced this functionality
> I’m patching for roughly a year, combined with the microcode going
> out, it seems like TSX’s numbered days have come to an end. 

Could you elaborate a little more here?  Why would we ever want to force
abort transactions that don't need to be aborted for some reason?