linux-kernel - Re: [PATCH] x86/xen/pvh: Enable PAE mode for 32-bit guest only when CONFIG_X86

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Message-ID: <2a02e3c2-b5c7-4bf0-8dcc-1e424efbfb6b@suse.com>
Date:   Fri, 20 Oct 2023 17:39:11 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Hou Wenlong <houwenlong.hwl@...group.com>,
        linux-kernel@...r.kernel.org
Cc:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "maintainer:X86 ARCHITECTURE 32-BIT AND 64-BIT" <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        "moderated list:XEN HYPERVISOR X86" <xen-devel@...ts.xenproject.org>,
        "open list:X86 PLATFORM DRIVERS - ARCH" 
        <platform-driver-x86@...r.kernel.org>
Subject: Re: [PATCH] x86/xen/pvh: Enable PAE mode for 32-bit guest only when
 CONFIG_X86_PAE is set

On 20.10.23 11:08, Hou Wenlong wrote:
> The PVH entry is available for 32-bit KVM guests, and 32-bit KVM guests
> do not depend on CONFIG_X86_PAE. However, mk_early_pgtbl_32() builds
> different pagetables depending on whether CONFIG_X86_PAE is set.
> Therefore, enabling PAE mode for 32-bit KVM guests without
> CONFIG_X86_PAE being set would result in a boot failure during CR3
> loading.
> 
> Signed-off-by: Hou Wenlong <houwenlong.hwl@...group.com>

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


Juergen


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