Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
MIME-Version: 1.0
References: <20220614120231.48165-1-kirill.shutemov@linux.intel.com>
 <cover.1664298261.git.thomas.lendacky@amd.com> <afd222473c7b18ea942e754a6c4df26ed74eedee.1664298261.git.thomas.lendacky@amd.com>
In-Reply-To: <afd222473c7b18ea942e754a6c4df26ed74eedee.1664298261.git.thomas.lendacky@amd.com>
From:   Dionna Amalie Glaze <dionnaglaze@google.com>
Date:   Tue, 27 Sep 2022 12:04:30 -0700
Message-ID: <CAAH4kHZZ+3Q3-k_OQ+y7zkVnNffCpgP-Kd5Pp24epn0LyVgDag@mail.gmail.com>
Subject: Re: [PATCH v5 1/6] x86/sev: Fix calculation of end address based on
 number of pages
To:     Tom Lendacky <thomas.lendacky@amd.com>
Cc:     LKML <linux-kernel@vger.kernel.org>,
        "the arch/x86 maintainers" <x86@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        "Kirill A. Shutemov" <kirill@shutemov.name>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Michael Roth <michael.roth@amd.com>,
        Joerg Roedel <jroedel@suse.de>,
        Andy Lutomirski <luto@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

>
> When calculating an end address based on an unsigned int number of pages,
> the number of pages must be cast to an unsigned long so that any value
> greater than or equal to 0x100000 does not result in zero after the shift.
>
> Fixes: 5e5ccff60a29 ("x86/sev: Add helper for validating pages in early enc attribute changes")

Tested-by: Dionna Glaze <dionnaglaze@google.com>

-- 
-Dionna Glaze, PhD (she/her)