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[2003:e5:8729:4000:29eb:6d9d:3214:39d2]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-428e6e9cd14sm18773995e9.45.2024.08.01.22.44.11 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 01 Aug 2024 22:44:11 -0700 (PDT) Message-ID: <242b327a-9244-411c-8d3e-7b860464f8f6@suse.com> Date: Fri, 2 Aug 2024 07:44:11 +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 1/3] xen, pvh: fix unbootable VMs (PVH + KASAN) To: Alexey Dobriyan , Boris Ostrovsky Cc: xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org References: Content-Language: en-US From: =?UTF-8?B?SsO8cmdlbiBHcm/Dnw==?= In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 01.08.24 21:16, Alexey Dobriyan wrote: > Uninstrument arch/x86/platform/pvh/enlighten.c: KASAN is not setup > _this_ early in the boot process. > > Steps to reproduce: > > make allnoconfig > make sure CONFIG_AMD_MEM_ENCRYPT is disabled > AMD_MEM_ENCRYPT independently uninstruments lib/string.o > so PVH boot code calls into uninstrumented memset() and > memcmp() which can make the bug disappear depending on > the compiler. > enable CONFIG_PVH > enable CONFIG_KASAN > enable serial console > this is fun exercise if you never done it from nothing :^) > > make > > qemu-system-x86_64 \ > -enable-kvm \ > -cpu host \ > -smp cpus=1 \ > -m 4096 \ > -serial stdio \ > -kernel vmlinux \ > -append 'console=ttyS0 ignore_loglevel' > > Messages on serial console will easily tell OK kernel from unbootable > kernel. In bad case qemu hangs in an infinite loop stroboscoping > "SeaBIOS" message. > > Signed-off-by: Alexey Dobriyan Acked-by: Juergen Gross Juergen