hello running on AMD Athlon(tm) X4 860K Quad Core Processor (complete specs enclosed below) 5.0.6 and 5.0.7 break kvm acceleration for qemu on my machines: an old windows XP guest, which has worked for 4 years without problems, suddenly doesn't boot any more. I'm running qemu like this: /usr/bin/qemu -m 2G /opt/windog \ -accel kvm,thread=multi \ -netdev user,id=net0,smb=/home/balducci \ -device rtl8139,netdev=net0 Facts ``` => If I run without kvm acceleration: no problems (but then the guest is so slow to be utterly unusable) => problem happens with 5.0.6 and 5.0.7: previous kernels are fine: GOOD BAD 4.20.14 5.0.6 5.0.2 5.0.7 5.0.3 5.0.4 5.0.5 => #> zcat /proc/config.gz|egrep KVM CONFIG_HAVE_KVM=y CONFIG_HAVE_KVM_IRQCHIP=y CONFIG_HAVE_KVM_IRQFD=y CONFIG_HAVE_KVM_IRQ_ROUTING=y CONFIG_HAVE_KVM_EVENTFD=y CONFIG_KVM_MMIO=y CONFIG_KVM_ASYNC_PF=y CONFIG_HAVE_KVM_MSI=y CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT=y CONFIG_KVM_VFIO=y CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT=y CONFIG_KVM_COMPAT=y CONFIG_HAVE_KVM_IRQ_BYPASS=y CONFIG_KVM=y # CONFIG_KVM_INTEL is not set CONFIG_KVM_AMD=y (I can send the whole .config file, if needed) => #> dmesg|egrep -i kvm [ 0.297108] kvm: Nested Virtualization enabled [ 0.297149] kvm: Nested Paging enabled => #> strace -o strace.out /usr/bin/qemu -m 2G /opt/windog \ -accel kvm,thread=multi \ -netdev user,id=net0,smb=/home/balducci \ -device rtl8139,netdev=net0 #> egrep -i kvm strace.out|uniq execve("/usr/bin/qemu", ["/usr/bin/qemu", "-m", "2G", "/opt/windog", "-accel", "kvm,thread=multi", "-netdev", "user,id=net0,smb=/home/balducci", "-device", "rtl8139,netdev=net0"], 0x7ffe38ab37d8 /* 112 vars */) = 0 openat(AT_FDCWD, "/dev/kvm", O_RDWR|O_CLOEXEC) = 16 ioctl(16, KVM_GET_API_VERSION, 0) = 12 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_IMMEDIATE_EXIT) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_NR_MEMSLOTS) = 509 ioctl(16, KVM_CREATE_VM, 0) = 18 ioctl(18, KVM_CHECK_EXTENSION, KVM_CAP_NR_VCPUS) = 240 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_MAX_VCPUS) = 288 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_USER_MEMORY) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_DESTROY_MEMORY_REGION_WORKS) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_SET_TSS_ADDR) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_EXT_CPUID) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_MP_STATE) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_COALESCED_MMIO) = 2 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_COALESCED_PIO) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_VCPU_EVENTS) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_X86_ROBUST_SINGLESTEP) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_DEBUGREGS) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_SIGNAL_MSI) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_PCI_2_3) = 0 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_IRQ_INJECT_STATUS) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_READONLY_MEM) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_IOEVENTFD) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_IRQFD) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_IRQFD_RESAMPLE) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_VM_ATTRIBUTES) = 0 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_IOEVENTFD_ANY_LENGTH) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_XSAVE) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_XCRS) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_PIT_STATE2) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_HYPERV_VP_INDEX) = 1 ioctl(16, KVM_GET_MSR_INDEX_LIST, 0x7fff07b89a40) = -1 E2BIG (Argument list too long) ioctl(16, KVM_GET_MSR_INDEX_LIST, 0x5570914ab630) = 0 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_GET_MSR_FEATURES) = 1 ioctl(16, KVM_GET_MSR_FEATURE_INDEX_LIST, 0x7fff07b89a40) = -1 E2BIG (Argument list too long) ioctl(16, KVM_GET_MSR_FEATURE_INDEX_LIST, 0x5570914a76e0) = 0 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_SET_IDENTITY_MAP_ADDR) = 1 ioctl(18, KVM_SET_IDENTITY_MAP_ADDR, 0x7fff07b899c8) = 0 ioctl(18, KVM_SET_TSS_ADDR, 0xfeffd000) = 0 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_X86_SMM) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_IRQCHIP) = 1 ioctl(18, KVM_CREATE_IRQCHIP, 0) = 0 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_IRQ_ROUTING) = 4096 ioctl(18, KVM_IOEVENTFD, 0x7fff07b89b80) = 0 ioctl(18, KVM_CHECK_EXTENSION, KVM_CAP_SYNC_MMU) = 1 ioctl(16, KVM_GET_SUPPORTED_CPUID, 0x55709151f140) = -1 E2BIG (Argument list too long) ioctl(16, KVM_GET_SUPPORTED_CPUID, 0x55709151f180) = -1 E2BIG (Argument list too long) ioctl(16, KVM_GET_SUPPORTED_CPUID, 0x55709151f1e0) = -1 E2BIG (Argument list too long) ioctl(16, KVM_GET_SUPPORTED_CPUID, 0x55709151f140) = -1 E2BIG (Argument list too long) ioctl(16, KVM_GET_SUPPORTED_CPUID, 0x55709151f290) = -1 E2BIG (Argument list too long) ioctl(16, KVM_GET_SUPPORTED_CPUID, 0x55709151f520) = -1 E2BIG (Argument list too long) ioctl(16, KVM_GET_SUPPORTED_CPUID, {nent=49, entries=[...]}) = 0 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_TSC_DEADLINE_TIMER) = 1 ioctl(16, KVM_GET_MSRS, 0x7fff07b89950) = 1 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_IRQ_ROUTING) = 4096 ioctl(18, KVM_GET_CLOCK, 0x7fff07b899c0) = 0 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_ADJUST_CLOCK) = 2 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_IRQ_ROUTING) = 4096 ioctl(18, KVM_SET_USER_MEMORY_REGION, {slot=0, flags=0, guest_phys_addr=0, memory_size=2147483648, userspace_addr=0x7f070fe00000}) = 0 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_IRQ_ROUTING) = 4096 access("kvmvapic.bin", R_OK) = -1 ENOENT (No such file or directory) access("/opt/stow.d/versions/qemu-4.0.0-rc3/usr/share/qemu-firmware/kvmvapic.bin", R_OK) = -1 ENOENT (No such file or directory) access("/opt/stow.d/versions/qemu-4.0.0-rc3/usr/share/qemu/kvmvapic.bin", R_OK) = 0 openat(AT_FDCWD, "/opt/stow.d/versions/qemu-4.0.0-rc3/usr/share/qemu/kvmvapic.bin", O_RDONLY) = 20 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_IRQ_ROUTING) = 4096 ioctl(18, KVM_SET_GSI_ROUTING, 0x55709174d6d0) = 0 ioctl(18, KVM_REGISTER_COALESCED_MMIO, 0x7fff07b898d0) = 0 ioctl(18, KVM_SET_USER_MEMORY_REGION, {slot=1, flags=KVM_MEM_READONLY, guest_phys_addr=0xfffc0000, memory_size=262144, userspace_addr=0x7f07a4c00000}) = 0 ioctl(18, KVM_REGISTER_COALESCED_MMIO, 0x7fff07b896e0) = 0 ioctl(18, KVM_SET_USER_MEMORY_REGION, {slot=0, flags=0, guest_phys_addr=0, memory_size=0, userspace_addr=0x7f070fe00000}) = 0 ioctl(18, KVM_SET_USER_MEMORY_REGION, {slot=0, flags=0, guest_phys_addr=0, memory_size=786432, userspace_addr=0x7f070fe00000}) = 0 ioctl(18, KVM_SET_USER_MEMORY_REGION, {slot=2, flags=KVM_MEM_READONLY, guest_phys_addr=0xc0000, memory_size=131072, userspace_addr=0x7f07a4a00000}) = 0 ioctl(18, KVM_SET_USER_MEMORY_REGION, {slot=3, flags=KVM_MEM_READONLY, guest_phys_addr=0xe0000, memory_size=131072, userspace_addr=0x7f07a4c20000}) = 0 ioctl(18, KVM_SET_USER_MEMORY_REGION, {slot=4, flags=0, guest_phys_addr=0x100000, memory_size=2146435072, userspace_addr=0x7f070ff00000}) = 0 ioctl(18, KVM_SET_USER_MEMORY_REGION, {slot=0, flags=0, guest_phys_addr=0, memory_size=0, userspace_addr=0x7f070fe00000}) = 0 ioctl(18, KVM_SET_USER_MEMORY_REGION, {slot=0, flags=0, guest_phys_addr=0, memory_size=655360, userspace_addr=0x7f070fe00000}) = 0 ioctl(18, KVM_REGISTER_COALESCED_MMIO, 0x7fff07b897f0) = 0 ioctl(18, KVM_REGISTER_COALESCED_MMIO, 0x7fff07b89870) = 0 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_PIT2) = 1 ioctl(18, KVM_CREATE_PIT2, 0x7fff07b899a0) = 0 ioctl(18, KVM_IRQ_LINE_STATUS, 0x7fff07b89960) = 0 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_X86_SMM) = 1 ioctl(18, KVM_SET_USER_MEMORY_REGION, {slot=65536, flags=0, guest_phys_addr=0, memory_size=786432, userspace_addr=0x7f070fe00000}) = 0 ioctl(18, KVM_SET_USER_MEMORY_REGION, {slot=65537, flags=KVM_MEM_READONLY, guest_phys_addr=0xc0000, memory_size=131072, userspace_addr=0x7f07a4a00000}) = 0 ioctl(18, KVM_SET_USER_MEMORY_REGION, {slot=65538, flags=KVM_MEM_READONLY, guest_phys_addr=0xe0000, memory_size=131072, userspace_addr=0x7f07a4c20000}) = 0 ioctl(18, KVM_SET_USER_MEMORY_REGION, {slot=65539, flags=0, guest_phys_addr=0x100000, memory_size=2146435072, userspace_addr=0x7f070ff00000}) = 0 ioctl(18, KVM_SET_USER_MEMORY_REGION, {slot=65540, flags=KVM_MEM_READONLY, guest_phys_addr=0xfffc0000, memory_size=262144, userspace_addr=0x7f07a4c00000}) = 0 ioctl(18, KVM_IRQ_LINE_STATUS, 0x7fff07b89cb0) = 0 ioctl(18, KVM_IRQ_LINE_STATUS, 0x7fff07b89c60) = 0 ioctl(18, KVM_IRQ_LINE_STATUS, 0x7fff07b89c80) = 0 ioctl(18, KVM_IRQ_LINE_STATUS, 0x7fff07b89c60) = 0 ioctl(18, KVM_IRQ_LINE_STATUS, 0x7fff07b89c80) = 0 ioctl(18, KVM_IRQ_LINE_STATUS, 0x7fff07b89c30) = 0 ioctl(18, KVM_GET_PIT2, 0x7fff07b89bb0) = 0 ioctl(18, KVM_SET_PIT2, 0x7fff07b89bd0) = 0 ioctl(18, KVM_SET_IRQCHIP, 0x7fff07b89a80) = 0 ioctl(18, KVM_SET_PIT2, 0x7fff07b89ac0) = 0 ioctl(18, KVM_SET_IRQCHIP, 0x7fff07b89940) = 0 ioctl(19, KVM_SET_VAPIC_ADDR, 0x7fff07b89c80) = 0 ioctl(18, KVM_SET_PIT2, 0x7fff07b89c20) = 0 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_KVMCLOCK_CTRL) = 1 ioctl(18, KVM_SET_CLOCK, 0x7fff07b89c60) = 0 ioctl(18, KVM_GET_DIRTY_LOG, 0x7fff07b899b0) = 0 ioctl(18, KVM_GET_PIT2, 0x7fff07b89c30) = 0 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_KVMCLOCK_CTRL) = 1 ioctl(18, KVM_GET_CLOCK, 0x7fff07b89bf0) = 0 ioctl(16, KVM_CHECK_EXTENSION, KVM_CAP_ADJUST_CLOCK) = 2 This problem might be related to 202189, but for me 4.20.14 and 5.0.[2-5] all work fine I'm sorry not being able to go deeper than this into the issue... Thanks ciao -gabriele ===================================================================== My specs ===================================================================== #> uname -sr Linux 5.0.7 #> cat /proc/cpuinfo processor : 0 vendor_id : AuthenticAMD cpu family : 21 model : 16 model name : AMD Athlon(tm) X4 740 Quad Core Processor stepping : 1 microcode : 0x6001116 cpu MHz : 3500.044 cache size : 2048 KB physical id : 0 siblings : 4 core id : 0 cpu cores : 2 apicid : 16 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 popcnt aes xsave avx f16c lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 tce nodeid_msr tbm topoext perfctr_core perfctr_nb cpb hw_pstate ssbd vmmcall bmi1 arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold bugs : fxsave_leak sysret_ss_attrs null_seg spectre_v1 spectre_v2 spec_store_bypass bogomips : 6400.08 TLB size : 1536 4K pages clflush size : 64 cache_alignment : 64 address sizes : 48 bits physical, 48 bits virtual power management: ts ttp tm 100mhzsteps hwpstate cpb eff_freq_ro [...cpus 1 2 3 omitted...] ```
Most likely the same problem has been reported here http://lists.nongnu.org/archive/html/qemu-devel/2019-04/msg03407.html
Yep, and https://bugzilla.suse.com/show_bug.cgi?id=1132694 as well, which has additional info.