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

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Message-ID: <20201013082047.ifigo5hua2qdrv75@black.fi.intel.com>
Date:   Tue, 13 Oct 2020 11:20:47 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     Arvind Sankar <nivedita@...m.mit.edu>, 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 Tue, Oct 13, 2020 at 10:11:17AM +0200, Borislav Petkov wrote:
> 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?

With TCG or KVM? I use -machine "type=q35,accel=tcg".

-- 
 Kirill A. Shutemov