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[Qemu-devel] [Bug 1661386] Re: Assertion `ret == cpu->kvm_msr_buf->nmsrs
From: |
Dr. David Alan Gilbert |
Subject: |
[Qemu-devel] [Bug 1661386] Re: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed |
Date: |
Mon, 06 Feb 2017 10:02:45 -0000 |
Hi Matwey,
1) Can you provide me with the output of the 'dmesg' command straight after
boot on your host.
2) If you look in target/i386/kvm.c in kvm_arch_init_vcpu around line 871 is
some code like:
if ((ver & 0xff) > 0) {
has_msr_architectural_pmu = true;
num_architectural_pmu_counters = (ver & 0xff00) >> 8;
/* Shouldn't be more than 32, since that's the number of bits
* available in EBX to tell us _which_ counters are available.
* Play it safe.
*/
if (num_architectural_pmu_counters > MAX_GP_COUNTERS) {
num_architectural_pmu_counters = MAX_GP_COUNTERS;
}
change the start of that to :
fprintf(stderr, "kvm_arch_init_vcpu ver=%x\n", ver);
if (0) {
I think that might make it work, but please tell us what it prints
as ver=
Dave
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https://bugs.launchpad.net/bugs/1661386
Title:
Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed
Status in QEMU:
New
Bug description:
Hello,
I see the following when try to run qemu from master as the following:
# ./x86_64-softmmu/qemu-system-x86_64 --version
QEMU emulator version 2.8.50 (v2.8.0-1006-g4e9f524)
Copyright (c) 2003-2016 Fabrice Bellard and the QEMU Project developers
# ./x86_64-softmmu/qemu-system-x86_64 -machine accel=kvm -nodefaults
-no-reboot -nographic -cpu host -vga none -kernel .build.kernel.kvm
-initrd .build.initrd.kvm -append 'panic=1 no-kvmclock console=ttyS0
loglevel=7' -m 1024 -serial stdio
qemu-system-x86_64: /home/matwey/lab/qemu/target/i386/kvm.c:1849:
kvm_put_msrs: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed.
First broken commit has been bisected:
commit 48e1a45c3166d659f781171a47dabf4a187ed7a5
Author: Paolo Bonzini <address@hidden>
Date: Wed Mar 30 22:55:29 2016 +0200
target-i386: assert that KVM_GET/SET_MSRS can set all requested MSRs
This would have caught the bug in the previous patch.
Signed-off-by: Paolo Bonzini <address@hidden>
My cpuinfo is the following:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 44
model name : Intel(R) Xeon(R) CPU X5675 @ 3.07GHz
stepping : 2
microcode : 0x14
cpu MHz : 3066.775
cache size : 12288 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 11
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts mmx fxsr sse sse2 ss ht syscall nx rdtscp lm
constant_tsc arch_perfmon pebs bts nopl xtopology tsc_reliable nonstop_tsc
aperfmperf pni pclmulqdq vmx ssse3 cx16 sse4_1 sse4_2 popcnt aes hypervisor
lahf_lm ida arat epb dtherm tpr_shadow vnmi ept vpid
bugs :
bogomips : 6133.55
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management:
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- [Qemu-devel] [Bug 1661386] [NEW] Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed, Matwey V. Kornilov, 2017/02/02
- [Qemu-devel] [Bug 1661386] Re: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed, Dr. David Alan Gilbert, 2017/02/03
- [Qemu-devel] [Bug 1661386] Re: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed, Dr. David Alan Gilbert, 2017/02/03
- [Qemu-devel] [Bug 1661386] Re: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed, Dr. David Alan Gilbert, 2017/02/03
- [Qemu-devel] [Bug 1661386] Re: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed,
Dr. David Alan Gilbert <=
- [Qemu-devel] [Bug 1661386] Re: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed, Matwey V. Kornilov, 2017/02/06
- [Qemu-devel] [Bug 1661386] Re: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed, Dr. David Alan Gilbert, 2017/02/06
- [Qemu-devel] [Bug 1661386] Re: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed, Paolo Bonzini, 2017/02/06
- [Qemu-devel] [Bug 1661386] Re: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed, Dr. David Alan Gilbert, 2017/02/06
- [Qemu-devel] [Bug 1661386] Re: Assertion `ret == cpu->kvm_msr_buf->nmsrs' failed, Paolo Bonzini, 2017/02/08