linux-kernel - Re: [PATCH v3 3/4] x86/mm: Flush global TLB when switching to trampoline page-table

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Message-Id: <76A7441A-2A7B-4FBD-A17E-B370893B9CEA@suse.de>
Date:   Fri, 1 Oct 2021 19:57:52 +0200
From:   Jörg Rödel <jroedel@...e.de>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        hpa@...or.com, Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Brijesh Singh <brijesh.singh@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/4] x86/mm: Flush global TLB when switching to
 trampoline page-table



> Am 01.10.2021 um 18:13 schrieb Dave Hansen <dave.hansen@...el.com>:
> 
> On 10/1/21 8:48 AM, Joerg Roedel wrote:
>> Move the switching code into a function so that it can be re-used and
>> add a global TLB flush. This makes sure that usage of memory which is
>> not mapped in the trampoline page-table is reliably caught.
> 
> This looks fine.  But, just to be clear, nothing in this series reuses
> the code, right?

Correct, but my SEV-ES kexec series will re-use it, as it also uses the trampoline_pgd and switches to real-mode to park the APs.

Regards,

Jörg