linux-kernel - Re: [PATCH] X86: __set_clr_pte_enc() miscalculates physical address

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Message-ID: <YFRG4maiL0CeFhGM@kroah.com>
Date:   Fri, 19 Mar 2021 07:38:26 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Isaku Yamahata <isaku.yamahata@...el.com>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        x86@...nel.org, kvm@...r.kernel.org, brijesh.singh@....com,
        tglx@...utronix.de, bp@...en8.de, isaku.yamahata@...il.com,
        thomas.lendacky@....com,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH] X86: __set_clr_pte_enc() miscalculates physical address

On Thu, Mar 18, 2021 at 01:26:57PM -0700, Isaku Yamahata wrote:
> __set_clr_pte_enc() miscalculates physical address to operate.
> pfn is in unit of PG_LEVEL_4K, not PGL_LEVEL_{2M, 1G}.
> Shift size to get physical address should be PAGE_SHIFT,
> not page_level_shift().
> 
> Fixes: dfaaec9033b8 ("x86: Add support for changing memory encryption attribute in early boot")
> Reviewed-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
> ---
>  arch/x86/mm/mem_encrypt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>