#!/usr/bin/env python3 # # Check for crash when using memory beyond the available guest processor # address space. # # Copyright (c) 2023 Red Hat, Inc. # # Author: # Ani Sinha # # SPDX-License-Identifier: GPL-2.0-or-later from qemu_test import QemuSystemTest import time class MemAddrCheck(QemuSystemTest): # after launch, in order to generate the logs from QEMU we need to # wait for some time. Launching and then immediately shutting down # the VM generates empty logs. A delay of 1 second is added for # this reason. DELAY_Q35_BOOT_SEQUENCE = 1 # first, lets test some 32-bit processors. # for all 32-bit cases, pci64_hole_size is 0. def test_phybits_low_pse36(self): """ With pse36 feature ON, a processor has 36 bits of addressing. So it can access up to a maximum of 64GiB of memory. Memory hotplug region begins at 4 GiB boundary when "above_4g_mem_size" is 0 (this would be true when we have 0.5 GiB of VM memory, see pc_q35_init()). This means total hotpluggable memory size is 60 GiB. Per slot, we reserve 1 GiB of memory for dimm alignment for all machines. That leaves total hotpluggable actual memory size of 59 GiB. If the VM is started with 0.5 GiB of memory, maxmem should be set to a maximum value of 59.5 GiB to ensure that the processor can address all memory directly. Note that 64-bit pci hole size is 0 in this case. If maxmem is set to 59.6G, QEMU should fail to start with a message "phy-bits are too low". If maxmem is set to 59.5G with all other QEMU parameters identical, QEMU should start fine. """ self.vm.add_args('-S', '-machine', 'q35', '-m', '512,slots=1,maxmem=59.6G', '-cpu', 'pentium,pse36=on', '-display', 'none', '-object', 'memory-backend-ram,id=mem1,size=1G', '-device', 'pc-dimm,id=vm0,memdev=mem1') self.vm.set_qmp_monitor(enabled=False) self.vm.launch() self.vm.wait() self.assertEqual(self.vm.exitcode(), 1, "QEMU exit code should be 1") self.assertRegex(self.vm.get_log(), r'phys-bits too low') def test_phybits_low_pae(self): """ With pae feature ON, a processor has 36 bits of addressing. So it can access up to a maximum of 64GiB of memory. Rest is the same as the case with pse36 above. """ self.vm.add_args('-S', '-machine', 'q35', '-m', '512,slots=1,maxmem=59.6G', '-cpu', 'pentium,pae=on', '-display', 'none', '-object', 'memory-backend-ram,id=mem1,size=1G', '-device', 'pc-dimm,id=vm0,memdev=mem1') self.vm.set_qmp_monitor(enabled=False) self.vm.launch() self.vm.wait() self.assertEqual(self.vm.exitcode(), 1, "QEMU exit code should be 1") self.assertRegex(self.vm.get_log(), r'phys-bits too low') def test_phybits_ok_pentium_pse36(self): """ Setting maxmem to 59.5G and making sure that QEMU can start with the same options as the failing case above with pse36 cpu feature. """ self.vm.add_args('-machine', 'q35', '-m', '512,slots=1,maxmem=59.5G', '-cpu', 'pentium,pse36=on', '-display', 'none', '-object', 'memory-backend-ram,id=mem1,size=1G', '-device', 'pc-dimm,id=vm0,memdev=mem1') self.vm.set_qmp_monitor(enabled=False) self.vm.launch() time.sleep(self.DELAY_Q35_BOOT_SEQUENCE) self.vm.shutdown() self.assertNotRegex(self.vm.get_log(), r'phys-bits too low') def test_phybits_ok_pentium_pae(self): """ Test is same as above but now with pae cpu feature turned on. Setting maxmem to 59.5G and making sure that QEMU can start fine with the same options as the case above. """ self.vm.add_args('-machine', 'q35', '-m', '512,slots=1,maxmem=59.5G', '-cpu', 'pentium,pae=on', '-display', 'none', '-object', 'memory-backend-ram,id=mem1,size=1G', '-device', 'pc-dimm,id=vm0,memdev=mem1') self.vm.set_qmp_monitor(enabled=False) self.vm.launch() time.sleep(self.DELAY_Q35_BOOT_SEQUENCE) self.vm.shutdown() self.assertNotRegex(self.vm.get_log(), r'phys-bits too low') def test_phybits_ok_pentium2(self): """ Pentium2 has 36 bits of addressing, so its same as pentium with pse36 ON. """ self.vm.add_args('-machine', 'q35', '-m', '512,slots=1,maxmem=59.5G', '-cpu', 'pentium2', '-display', 'none', '-object', 'memory-backend-ram,id=mem1,size=1G', '-device', 'pc-dimm,id=vm0,memdev=mem1') self.vm.set_qmp_monitor(enabled=False) self.vm.launch() time.sleep(self.DELAY_Q35_BOOT_SEQUENCE) self.vm.shutdown() self.assertNotRegex(self.vm.get_log(), r'phys-bits too low') def test_phybits_low_nonpse36(self): """ Pentium processor has 32 bits of addressing without pse36 or pae so it can access physical address up to 4 GiB. Setting maxmem to 4 GiB should make QEMU fail to start with "phys-bits too low" message because the region for memory hotplug is always placed above 4 GiB due to the PCI hole and simplicity. """ self.vm.add_args('-S', '-machine', 'q35', '-m', '512,slots=1,maxmem=4G', '-cpu', 'pentium', '-display', 'none', '-object', 'memory-backend-ram,id=mem1,size=1G', '-device', 'pc-dimm,id=vm0,memdev=mem1') self.vm.set_qmp_monitor(enabled=False) self.vm.launch() self.vm.wait() self.assertEqual(self.vm.exitcode(), 1, "QEMU exit code should be 1") self.assertRegex(self.vm.get_log(), r'phys-bits too low') # now lets test some 64-bit CPU cases. def test_phybits_low_tcg_q35_70_amd(self): """ For q35 7.1 machines and above, there is a HT window that starts at 1024 GiB and ends at 1 TiB - 1. If the max GPA falls in this range, "above_4G" memory is adjusted to start at 1 TiB boundary for AMD cpus in the default case. Lets test without that case for machines 7.0. For q35-7.0 machines, "above 4G" memory starts are 4G. pci64_hole size is 32 GiB. Since TCG_PHYS_ADDR_BITS is defined to be 40, TCG emulated CPUs have maximum of 1 TiB (1024 GiB) of directly addressable memory. Hence, maxmem value at most can be 1024 GiB - 4 GiB - 1 GiB per slot for alignment - 32 GiB + 0.5 GiB which is equal to 987.5 GiB. Setting the value to 988 GiB should make QEMU fail with the error message. """ self.vm.add_args('-S', '-machine', 'pc-q35-7.0', '-m', '512,slots=1,maxmem=988G', '-display', 'none', '-object', 'memory-backend-ram,id=mem1,size=1G', '-device', 'pc-dimm,id=vm0,memdev=mem1') self.vm.set_qmp_monitor(enabled=False) self.vm.launch() self.vm.wait() self.assertEqual(self.vm.exitcode(), 1, "QEMU exit code should be 1") self.assertRegex(self.vm.get_log(), r'phys-bits too low') def test_phybits_low_tcg_q35_71_amd(self): """ AMD_HT_START is defined to be at 1012 GiB. So for q35 machines version > 7.0 and AMD cpus, instead of 1024 GiB limit for 40 bit processor address space, it has to be 1012 GiB , that is 12 GiB less than the case above in order to accommodate HT hole. Make sure QEMU fails when maxmem size is 976 GiB (12 GiB less than 988 GiB). """ self.vm.add_args('-S', '-machine', 'pc-q35-7.1', '-m', '512,slots=1,maxmem=976G', '-display', 'none', '-object', 'memory-backend-ram,id=mem1,size=1G', '-device', 'pc-dimm,id=vm0,memdev=mem1') self.vm.set_qmp_monitor(enabled=False) self.vm.launch() self.vm.wait() self.assertEqual(self.vm.exitcode(), 1, "QEMU exit code should be 1") self.assertRegex(self.vm.get_log(), r'phys-bits too low') def test_phybits_ok_tcg_q35_70_amd(self): """ Same as q35-7.0 AMD case except that here we check that QEMU can successfully start when maxmem is < 988G. """ self.vm.add_args('-S', '-machine', 'pc-q35-7.0', '-m', '512,slots=1,maxmem=987.5G', '-display', 'none', '-object', 'memory-backend-ram,id=mem1,size=1G', '-device', 'pc-dimm,id=vm0,memdev=mem1') self.vm.set_qmp_monitor(enabled=False) self.vm.launch() time.sleep(self.DELAY_Q35_BOOT_SEQUENCE) self.vm.shutdown() self.assertNotRegex(self.vm.get_log(), r'phys-bits too low') def test_phybits_ok_tcg_q35_71_amd(self): """ Same as q35-7.1 AMD case except that here we check that QEMU can successfully start when maxmem is < 976G. """ self.vm.add_args('-S', '-machine', 'pc-q35-7.1', '-m', '512,slots=1,maxmem=975.5G', '-display', 'none', '-object', 'memory-backend-ram,id=mem1,size=1G', '-device', 'pc-dimm,id=vm0,memdev=mem1') self.vm.set_qmp_monitor(enabled=False) self.vm.launch() time.sleep(self.DELAY_Q35_BOOT_SEQUENCE) self.vm.shutdown() self.assertNotRegex(self.vm.get_log(), r'phys-bits too low') def test_phybits_ok_tcg_q35_71_intel(self): """ Same parameters as test_phybits_low_tcg_q35_71_amd() but use Intel cpu instead. QEMU should start fine in this case as "above_4G" memory starts at 4G. """ self.vm.add_args('-S', '-cpu', 'Skylake-Server', '-machine', 'pc-q35-7.1', '-m', '512,slots=1,maxmem=976G', '-display', 'none', '-object', 'memory-backend-ram,id=mem1,size=1G', '-device', 'pc-dimm,id=vm0,memdev=mem1') self.vm.set_qmp_monitor(enabled=False) self.vm.launch() time.sleep(self.DELAY_Q35_BOOT_SEQUENCE) self.vm.shutdown() self.assertNotRegex(self.vm.get_log(), r'phys-bits too low') def test_phybits_low_tcg_q35_71_amd_41bits(self): """ AMD processor with 41 bits. Max cpu hw address = 2 TiB. By setting maxram above 1012 GiB - 32 GiB - 4 GiB = 976 GiB, we can force "above_4G" memory to start at 1 TiB for q35-7.1 machines (max GPA will be above AMD_HT_START which is defined as 1012 GiB). With pci_64_hole size at 32 GiB, in this case, maxmem should be 991.5 GiB with 1 GiB per slot for alignment and 0.5 GiB as non-hotplug memory for the VM (1024 - 32 - 1 + 0.5). With 992 GiB, QEMU should fail to start. """ self.vm.add_args('-S', '-cpu', 'EPYC-v4,phys-bits=41', '-machine', 'pc-q35-7.1', '-m', '512,slots=1,maxmem=992G', '-display', 'none', '-object', 'memory-backend-ram,id=mem1,size=1G', '-device', 'pc-dimm,id=vm0,memdev=mem1') self.vm.set_qmp_monitor(enabled=False) self.vm.launch() self.vm.wait() self.assertEqual(self.vm.exitcode(), 1, "QEMU exit code should be 1") self.assertRegex(self.vm.get_log(), r'phys-bits too low') def test_phybits_ok_tcg_q35_71_amd_41bits(self): """ AMD processor with 41 bits. Max cpu hw address = 2 TiB. Same as above but by setting maxram between 976 GiB and 992 Gib, QEMU should start fine. """ self.vm.add_args('-S', '-cpu', 'EPYC-v4,phys-bits=41', '-machine', 'pc-q35-7.1', '-m', '512,slots=1,maxmem=990G', '-display', 'none', '-object', 'memory-backend-ram,id=mem1,size=1G', '-device', 'pc-dimm,id=vm0,memdev=mem1') self.vm.set_qmp_monitor(enabled=False) self.vm.launch() time.sleep(self.DELAY_Q35_BOOT_SEQUENCE) self.vm.shutdown() self.assertNotRegex(self.vm.get_log(), r'phys-bits too low') def test_phybits_low_tcg_q35_intel_cxl(self): """ cxl memory window starts after memory device range. Here, we use 1 GiB of cxl window memory. 4G_mem end aligns at 4G. pci64_hole is 32 GiB and starts after the cxl memory window. So maxmem here should be at most 986 GiB considering all memory boundary alignment constraints with 40 bits (1 TiB) of processor physical bits. """ self.vm.add_args('-S', '-cpu', 'Skylake-Server,phys-bits=40', '-machine', 'q35,cxl=on', '-m', '512,slots=1,maxmem=987G', '-display', 'none', '-device', 'pxb-cxl,bus_nr=12,bus=pcie.0,id=cxl.1', '-M', 'cxl-fmw.0.targets.0=cxl.1,cxl-fmw.0.size=1G') self.vm.set_qmp_monitor(enabled=False) self.vm.launch() self.vm.wait() self.assertEqual(self.vm.exitcode(), 1, "QEMU exit code should be 1") self.assertRegex(self.vm.get_log(), r'phys-bits too low') def test_phybits_ok_tcg_q35_intel_cxl(self): """ Same as above but here we do not reserve any cxl memory window. Hence, with the exact same parameters as above, QEMU should start fine even with cxl enabled. """ self.vm.add_args('-S', '-cpu', 'Skylake-Server,phys-bits=40', '-machine', 'q35,cxl=on', '-m', '512,slots=1,maxmem=987G', '-display', 'none', '-device', 'pxb-cxl,bus_nr=12,bus=pcie.0,id=cxl.1') self.vm.set_qmp_monitor(enabled=False) self.vm.launch() time.sleep(self.DELAY_Q35_BOOT_SEQUENCE) self.vm.shutdown() self.assertNotRegex(self.vm.get_log(), r'phys-bits too low') if __name__ == '__main__': QemuSystemTest.main()