linux-kernel - Re: [PATCH] x86/boot/64: Initialize 5-level paging variables earlier

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Message-ID: <20201013081117.GA28215@zn.tnic>
Date:   Tue, 13 Oct 2020 10:11:17 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Arvind Sankar <nivedita@...m.mit.edu>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        x86@...nel.org, Joerg Roedel <jroedel@...e.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/boot/64: Initialize 5-level paging variables earlier

On Mon, Oct 12, 2020 at 11:35:01AM -0400, Arvind Sankar wrote:
> > qemu supports it. -cpu "qemu64,+la57"
>
> Thanks! On QEMU, it does crash without this patch.

Works fine here. I gave this to qemu:

-cpu qemu64,+la57,vendor=GenuineIntel

it said:

qemu-system-x86_64: warning: host doesn't support requested feature: CPUID.07H:ECX.la57 [bit 16]

because host is AMD, probably, and I have

CONFIG_X86_5LEVEL=y

enabled for the guest kernel and tip:x86/seves booted fine.

What am I missing?

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette