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[88.187.86.199]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-38dbdd36967sm7577510f8f.37.2025.02.08.08.42.22 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 08 Feb 2025 08:42:23 -0800 (PST) Message-ID: <73674902-bfac-45ca-ba63-5aafe66dbc80@linaro.org> Date: Sat, 8 Feb 2025 17:42:21 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 8/9] meson: Disallow 64-bit on 32-bit emulation To: Richard Henderson , qemu-devel@nongnu.org Cc: pbonzini@redhat.com, mark.cave-ayland@ilande.co.uk, berrange@redhat.com, thuth@redhat.com References: <20250207210655.16717-1-richard.henderson@linaro.org> <20250207210655.16717-9-richard.henderson@linaro.org> Content-Language: en-US From: =?UTF-8?Q?Philippe_Mathieu-Daud=C3=A9?= In-Reply-To: <20250207210655.16717-9-richard.henderson@linaro.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a00:1450:4864:20::32f; envelope-from=philmd@linaro.org; helo=mail-wm1-x32f.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 7/2/25 22:06, Richard Henderson wrote: > For system mode, we can rarely support the amount of RAM that > the guest requires. TCG emulation is restricted to round-robin > mode, which solves many of the atomicity issues, but not those > associated with virtio. In any case, round-robin does nothing > to help the speed of emulation. > > For user mode, most emulation does not succeed at all. Most > of the time we cannot even load 64-bit non-PIE binaries due > to lack of a 64-bit address space. Threads are run in > parallel, not round-robin, which means that atomicity > is not handled. > > Reviewed-by: Thomas Huth > Signed-off-by: Richard Henderson > --- > meson.build | 13 ++++++++++--- > 1 file changed, 10 insertions(+), 3 deletions(-) Reviewed-by: Philippe Mathieu-Daudé