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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.593, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, 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 4/10/25 15:13, Kohei Tokunaga wrote: > > The biggest problem I'm seeing is we no longer support 64-bit guests on > > 32-bit hosts, and don't plan to revert that. > > Yes, so the sixth patch ("[PATCH 06/10] include/exec: Allow using 64bit > guest addresses on emscripten") should be considered as a temporary > workaround, enabled only for Emsripten builds. It will be removed once > wasm64 gains broader support and is adopted in the Wasm backend. Maybe there's a way though. Currently we don't support 64-bit guests on 32-bit hosts, but more precisely we don't support 64-bit guests with 32-bit host word size. The wasm TCG backend is able to compile with 64-bit words: +#define TCG_TARGET_HAS_div_i64 1 +#define TCG_TARGET_HAS_rem_i64 1 etc. and if x32 was a thing it would as well. In fact the changes in patch 6/10 are not a full revert, and the "#ifdef EMSCRIPTEN" could be changed to #if HOST_LONG_BITS >= TARGET_LONG_BITS ... use uintptr_t #else ... use uint64_t #endif Paolo