linux-kernel - Re: [PATCH 1/9] xen/x86: prevent PVH type from getting clobbered

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Message-ID: <ca719eaa-892a-9baa-c9a3-136314193e7a@suse.com>
Date:   Thu, 23 Sep 2021 15:06:27 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Jan Beulich <jbeulich@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:     Stefano Stabellini <sstabellini@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>
Subject: Re: [PATCH 1/9] xen/x86: prevent PVH type from getting clobbered

On 07.09.21 12:07, Jan Beulich wrote:
> Like xen_start_flags, xen_domain_type gets set before .bss gets cleared.
> Hence this variable also needs to be prevented from getting put in .bss,
> which is possible because XEN_NATIVE is an enumerator evaluating to
> zero. Any use prior to init_hvm_pv_info() setting the variable again
> would lead to wrong decisions; one such case is xenboot_console_setup()
> when called as a result of "earlyprintk=xen".
> 
> Use __ro_after_init as more applicable than either __section(".data") or
> __read_mostly.
> 
> Signed-off-by: Jan Beulich <jbeulich@...e.com>

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


Juergen

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