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Date: Wed, 19 Jul 2017 23:20:00 -0500
From: Josh Poimboeuf <jpoimboe@redhat.com>
To: Petr Mladek <pmladek@suse.com>
Cc: Joe Lawrence <joe.lawrence@redhat.com>, live-patching@vger.kernel.org,
        linux-kernel@vger.kernel.org, Jessica Yu <jeyu@kernel.org>,
        Jiri Kosina <jikos@kernel.org>, Miroslav Benes <mbenes@suse.cz>,
        Chris J Arges <chris.j.arges@canonical.com>
Subject: Re: [PATCH] livepatch: add (un)patch hooks
Message-ID: <20170720042000.34trkuzwevrkscds@treble>
References: <1499868600-10176-1-git-send-email-joe.lawrence@redhat.com>
 <1499868600-10176-2-git-send-email-joe.lawrence@redhat.com>
 <20170717155144.GF32632@pathway.suse.cz>
 <20170719204952.4fyhtig3rbw7z4w4@treble>
 <20170720041723.35r6qk2fia7xix3t@treble>
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On Wed, Jul 19, 2017 at 11:17:23PM -0500, Josh Poimboeuf wrote:
> +static void swapgs_unload_hook(void)
> +{
> +	if (paravirt_enabled() && strcmp(pv_info.name, "KVM"))
> +		return;
> +
> +	write_cr0(read_cr0() & ~X86_CR0_WP);
> +	barrier();
> +
> +	set_intr_gate_ist(X86_TRAP_SS, stack_segment_v2, STACKFAULT_STACK);

s/stack_segment_v2/stack_segment/ for the unload hook

> +
> +	barrier();
> +	write_cr0(read_cr0() | X86_CR0_WP);
> +}
> +KLP_UNLOAD_HOOK(swapgs_unload_hook);

-- 
Josh