linux-kernel - Re: [PATCH v3] x86/ioperm: Fix io bitmap invalidation on Xen PV

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Date:   Sat, 18 Jul 2020 06:40:33 +0200
From:   Jürgen Groß <jgross@...e.com>
To:     Andy Lutomirski <luto@...nel.org>, x86@...nel.org
Cc:     Andrew Cooper <andrew.cooper3@...rix.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        stable@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v3] x86/ioperm: Fix io bitmap invalidation on Xen PV

On 18.07.20 01:53, Andy Lutomirski wrote:
> tss_invalidate_io_bitmap() wasn't wired up properly through the pvop
> machinery, so the TSS and Xen's io bitmap would get out of sync
> whenever disabling a valid io bitmap.
> 
> Add a new pvop for tss_invalidate_io_bitmap() to fix it.
> 
> This is XSA-329.
> 
> Cc: Juergen Gross <jgross@...e.com>
> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Cc: Stefano Stabellini <sstabellini@...nel.org>
> Cc: stable@...r.kernel.org
> Fixes: 22fe5b0439dd ("x86/ioperm: Move TSS bitmap update to exit to user work")
> Reviewed-by: Juergen Gross <jgross@...e.com>
> Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Andy Lutomirski <luto@...nel.org>

Reviewed-by: Juergen Gross <jgross@...e.com>


Juergen