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envelope-from=NikunjAmritlal.Dadhania@amd.com; helo=NAM10-BN7-obe.outbound.protection.outlook.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, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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" On 7/18/2022 6:12 PM, Igor Mammedov wrote: > On Mon, 18 Jul 2022 13:47:34 +0530 > Nikunj A Dadhania wrote: > >> Currently it is possible to start a guest with memory that is beyond >> the addressable range of CPU and QEMU does not even warn about it. >> The default phys_bits is 40 and can address 1TB. However it allows to >> start a guest with greater than 1TB memory. >> >> Prevent this by erroring out in such a scenario. >> >> Reported-by: Shaju Abraham >> Signed-off-by: Nikunj A Dadhania > > > Following shall care of your issue: > https://www.mail-archive.com/qemu-devel@nongnu.org/msg900136.html Thanks, I tried out the patch series, I could start guest till 978G (not sure why this magic number yet) and after that I start getting errors: $ ./build/qemu-system-x86_64 -enable-kvm -machine q35 -m 979G -kernel bzImage -initrd initramfs.cpio -vga none -nographic -append "console=ttyS0,115200n8 earlyprintk=serial,ttyS0,115200 debug=1 " -nodefaults -serial stdio qemu-system-x86_64: Address space limit 0xffffffffff < 0x1fc3fffffff phys-bits too low (40) Regards Nikunj