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Diffstat (limited to 'results/classifier/108/other/1562653')
| -rw-r--r-- | results/classifier/108/other/1562653 | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/results/classifier/108/other/1562653 b/results/classifier/108/other/1562653 new file mode 100644 index 00000000..6fb6d5ab --- /dev/null +++ b/results/classifier/108/other/1562653 @@ -0,0 +1,165 @@ +permissions: 0.913 +KVM: 0.861 +performance: 0.850 +graphic: 0.837 +device: 0.836 +other: 0.822 +vnc: 0.819 +PID: 0.800 +boot: 0.793 +network: 0.777 +socket: 0.760 +debug: 0.752 +files: 0.717 +semantic: 0.706 + +Ubuntu 15.10: QEMU VM hang if memory >= 1T + +1. Ubuntu 15.10 x86_64 installed on HP SuperDome X with 8CPUs and 4T memory. + +2. Create a VM, install Ubuntu 15.10, if memory >= 1T , VM hang when start. If memory < 1T, it is good. +<domain type='kvm'> + <name>u1510-1</name> + <uuid>39eefe1e-4829-4843-b892-026d143f3ec7</uuid> + <memory unit='KiB'>1073741824</memory> + <currentMemory unit='KiB'>1073741824</currentMemory> + <vcpu placement='static'>16</vcpu> + <os> + <type arch='x86_64' machine='pc-i440fx-2.3'>hvm</type> + <boot dev='hd'/> + <boot dev='cdrom'/> + </os> + <features> + <acpi/> + <apic/> + <pae/> + </features> + <clock offset='utc'/> + <on_poweroff>destroy</on_poweroff> + <on_reboot>restart</on_reboot> + <on_crash>restart</on_crash> + <devices> + <emulator>/usr/bin/kvm</emulator> + <disk type='file' device='disk'> + <driver name='qemu' type='qcow2' cache='directsync'/> + <source file='/vms/images/u1510-1.img'/> + <target dev='vda' bus='virtio'/> + <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/> + </disk> + <disk type='file' device='cdrom'> + <driver name='qemu' type='raw'/> + <target dev='hdc' bus='ide'/> + <readonly/> + <address type='drive' controller='0' bus='1' target='0' unit='0'/> + </disk> + <controller type='pci' index='0' model='pci-root'/> + <controller type='ide' index='0'> + <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/> + </controller> + <controller type='usb' index='0'> + <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/> + </controller> + <interface type='bridge'> + <mac address='0c:da:41:1d:ae:f1'/> + <source bridge='vswitch0'/> + <model type='virtio'/> + <driver name='vhost'/> + <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/> + </interface> + <input type='mouse' bus='ps2'/> + <input type='keyboard' bus='ps2'/> + <graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0'> + <listen type='address' address='0.0.0.0'/> + </graphics> + <video> + <model type='cirrus' vram='16384' heads='1'/> + <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/> + </video> + <memballoon model='virtio'> + <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/> + </memballoon> + </devices> +</domain> + +3. The panic stack is + ... cannot show + async_page_fault+0x28 + ioread32_rep+0x38 + ata_sff_data_xfer32+0x8a + ata_pio_sector+0x93 + ata_pio_sectors+0x34 + ata_sff_hsm_move+0x226 + RIP: kthread_data+0x10 + CR2: FFFFFFFF_FFFFFFD8 + +4. Change the host os to Redhat 7.2 , the vm is good even memory >=3.8T. + +I delete cdrom and IDE controller, the vm start sucessfully. + +But when I increate memory to 1100G, vm hang at hpet_enable when start. + +The panic is page_fault when execute hpet_period = hpet_readl(HPET_PERIOD); + +It seems that ioremap_nocache does not works correctly. + +hpet_virt_address = ioremap_nocache(hpet_address, HPET_MMAP_SIZE); + +Hi, + +just to be sure, if you run + +kvm -vnc :1 -m 1.5G +kvm -vnc :1 -m 1.5G --no-hpet + +do those also crash? + +Can you please show the contents of + +/var/log/libvirt/qemu/u1510-1.log + +I mean vm hang when memory >= 1100G (1024G when enable ide cdrom) instead of 1.5G. + +If disable hpet, the vm will hang at acpi_ex_system_memory_space_handler when memory >= 1100G + +If disable kvm, vm is good when memory <= 1020G, but also hang when memory >= 1024G. + +There is no critical information in vm.log: + + +After I changed PHYS_ADDR_MASK, qemu vm can start when memory >=1024G , but kvm vm still hang. + +-# define PHYS_ADDR_MASK 0xffffffffffLL ++# define PHYS_ADDR_MASK 0xfffffffffffLL + + +The issue is sloved after change cpuid[80000008]; + +--- a/target-i386/cpu.c ++++ b/target-i386/cpu.c +@@ -2547,7 +2547,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, + if (env->features[FEAT_8000_0001_EDX] & CPUID_EXT2_LM) { + /* 64 bit processor */ + /* XXX: The physical address space is limited to 42 bits in exec.c. */ +- *eax = 0x00003028; /* 48 bits virtual, 40 bits physical */ ++ *eax = 0x00003029; /* 48 bits virtual, 41 bits physical */ + } else { + if (env->features[FEAT_1_EDX] & CPUID_PSE36) { + *eax = 0x00000024; /* 36 bits physical */ + + +For cpus which have not EPT feature, should change CR3_L_MODE_RESERVED_BITS in arch/x86/include/asm/kvm_host.h: + +-#define CR3_L_MODE_RESERVED_BITS 0xFFFFFF0000000000ULL ++#define CR3_L_MODE_RESERVED_BITS 0xFFFFFE0000000000ULL + + +Can you still reproduce this problem with the latest version of upstream QEMU? + +[Expired for QEMU because there has been no activity for 60 days.] + +[Expired for qemu (Ubuntu) because there has been no activity for 60 days.] + +I only saw this because it expired now :-/ + +Anyone affected by this might want to take a look at bug 1776189 where Ubuntu added a special machine type to more easily set "host-phys-bits" which is the qemu flag to have more (usually the host has more) available (at the cost of migratability). That allows <1TB as the default bits in qemu are chosen on the base of TCG (to be able to emulate what is virtualized) and that is limited to 1TB. + |