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[2003:e5:8741:4a00:60e5:7bee:fc48:e85c]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a83838c6c1dsm102907666b.5.2024.08.15.06.32.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 15 Aug 2024 06:32:32 -0700 (PDT) Message-ID: Date: Thu, 15 Aug 2024 15:32:31 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/3] x86/cpu: fix unbootable VMs by inlining memcmp() in hypervisor_cpuid_base() To: Alexey Dobriyan , boris.ostrovsky@oracle.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com Cc: linux-kernel@vger.kernel.org, x86@kernel.org, hpa@zytor.com References: <20240802154253.482658-1-adobriyan@gmail.com> <20240802154253.482658-2-adobriyan@gmail.com> Content-Language: en-US From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= In-Reply-To: <20240802154253.482658-2-adobriyan@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 02.08.24 17:42, Alexey Dobriyan wrote: > If this memcmp() is not inlined then PVH early boot code can call > into KASAN-instrumented memcmp() which results in unbootable VMs: > > pvh_start_xen > xen_prepare_pvh > xen_cpuid_base > hypervisor_cpuid_base > memcmp > > Signed-off-by: Alexey Dobriyan Acked-by: Juergen Gross Juergen