linux-kernel - Re: hv_hypercall

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Message-ID: <20200616104032.GR2531@hirez.programming.kicks-ass.net>
Date:   Tue, 16 Jun 2020 12:40:32 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Dexuan Cui <decui@...rosoft.com>, vkuznets <vkuznets@...hat.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Andy Lutomirski <luto@...nel.org>,
        Andy Lutomirski <luto@...capital.net>,
        Michael Kelley <mikelley@...rosoft.com>,
        Ju-Hyoung Lee <juhlee@...rosoft.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        KY Srinivasan <kys@...rosoft.com>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: hv_hypercall_pg page permissios

On Tue, Jun 16, 2020 at 12:33:13PM +0200, Christoph Hellwig wrote:
> sorry, s/ftrace/kprobes/.  See my updated branch here:
> 
> http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/module_alloc-cleanup

Ah the insn slot page, yes. Didn't you just loose VM_FLUSH_RESET_PERMS
there?