Hi Jason：
I make two tests：
1. I write a test code follow "open /dev/kvm” "create vm” "create vcpu”，it
has no error；
2. I put allocate pmem and create vcpu in create_vm function in gem5，not
outside create_vm，it has no error.
so I suspect if the allocate pmem function in gem5 source has any wrongs？
发件人： Jason Lowe-Power<ja...@lowepower.com<mailto:ja...@lowepower.com>>
收件人： Liyichao<liyic...@huawei.com<mailto:liyic...@huawei.com>>
抄送： gem5 users mailing list<gem5-users@gem5.org<mailto:gem5-users@gem5.org>>
主题： Re: [gem5-users] Fail to bootup with KVM in se.py on X86 arch
时间： 2021-05-11 22:47:19
Hello,
I wonder if you have a maximum number of vcpus set on your host system.
Otherwise, I can't think of any specific limitation to creating vcpus.
Cheers,
Jason
On Tue, May 11, 2021 at 2:36 AM Liyichao
<liyic...@huawei.com<mailto:liyic...@huawei.com>> wrote:
Hi Jason:
I use strace to follow the call stack, I find that the ioctl() with
KVM_CREATE_VCPU returned EEXIST errno, this means the vCPU exist.
ioctl(5, KVM_CREATE_VCPU, 2) = -1 EEXIST (File exists)
发件人: Liyichao
发送时间: 2021年5月11日 12:54
收件人: 'Jason Lowe-Power' <ja...@lowepower.com<mailto:ja...@lowepower.com>>; gem5
users mailing list <gem5-users@gem5.org<mailto:gem5-users@gem5.org>>
主题: 答复: [gem5-users] Fail to bootup with KVM in se.py on X86 arch
Hi Jason:
I have add a DPRINTF in line 559 of vm.cc , it showed “ 0:
system.kvm_vm: *************debug vcpuID is 0”
Any KVM use limitations in X86?
gem5 version 21.0.0.0
gem5 compiled May 11 2021 01:04:20
gem5 started May 11 2021 01:09:26
gem5 executing on ubuntu, pid 53534
command line: ./build/X86/gem5.opt --debug-flags=Kvm configs/example/se.py
--cpu-type=X86KvmCPU --cpu-clock=2.6GHz --sys-clock=2.6GHz --caches
--l1d_size=64kB --l1i_size=64kB --l2cache --l2_size=32MB --mem-size=32GB
--num-cpus=1 -I 5000 -c ./test
warn: membus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: tol2bus.master is deprecated. `master` is now called `mem_side_ports`
warn: membus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: tol2bus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: tol2bus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: tol2bus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: tol2bus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: membus.master is deprecated. `master` is now called `mem_side_ports`
warn: membus.master is deprecated. `master` is now called `mem_side_ports`
warn: membus.slave is deprecated. `slave` is now called `cpu_side_ports`
Global frequency set at 1000000000000 ticks per second
warn: DRAM device capacity (8192 Mbytes) does not match the address range
assigned (32768 Mbytes)
0: system.cpu: vcpuID is 0
0: system.remote_gdb: listening for remote gdb on port 7000
0: system.cpu: ActivateContext 0
**** REAL SIMULATION ****
0: system.kvm_vm: Mapping 1 memory region(s)
0: system.kvm_vm: Mapping region: 0x0x7f0b007b7000 -> 0x0 [size:
0x800000000]
0: system.kvm_vm: vmFD is 5, p1 is 140724538190576
0: system.cpu: charlie, vcpuID is 0
0: system.kvm_vm: vmFD is 5, p1 is 0
0: system.kvm_vm: *************debug vcpuID is 0
panic: KVM: Failed to create virtual CPU
Memory Usage: 33838804 KBytes
Program aborted at tick 0
--- BEGIN LIBC BACKTRACE ---
./build/X86/gem5.opt(_Z15print_backtracev+0x2c)[0x5622a4c15f8c]
./build/X86/gem5.opt(_Z12abortHandleri+0x4a)[0x5622a4c30b6a]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x12980)[0x7f1305ea6980]
/lib/x86_64-linux-gnu/libc.so.6(gsignal+0xc7)[0x7f1304430fb7]
/lib/x86_64-linux-gnu/libc.so.6(abort+0x141)[0x7f1304432921]
./build/X86/gem5.opt(+0x6e5cef)[0x5622a3f20cef]
./build/X86/gem5.opt(_ZN5KvmVM10createVCPUEl+0x9ff)[0x5622a4953b8f]
./build/X86/gem5.opt(_ZN10BaseKvmCPU7startupEv+0x9e)[0x5622a494bc8e]
./build/X86/gem5.opt(_ZN9X86KvmCPU7startupEv+0x9)[0x5622a4969509]
________________________________
发件人: Jason Lowe-Power [mailto:ja...@lowepower.com]
发送时间: 2021年5月10日 23:56
收件人: gem5 users mailing list <gem5-users@gem5.org<mailto:gem5-users@gem5.org>>
抄送: Liyichao <liyic...@huawei.com<mailto:liyic...@huawei.com>>
主题: Re: [gem5-users] Fail to bootup with KVM in se.py on X86 arch
Hmm, I don't immediately know what's going wrong. I would extend the panic on
line 559 of vm.cc to also print the error code number so you can look it up. I
believe you can use `errno` like normal after calling `ioctl`. For instance,
you could add `strerror(errno)` to the panic.
Cheers,
Jason
On Mon, May 10, 2021 at 12:49 AM Liyichao via gem5-users
<gem5-users@gem5.org<mailto:gem5-users@gem5.org>> wrote:
Hi All:
I use KVM CPU in se mode on X86 arch, but it showed a panic “KVM:
Failed to create virtual CPU”.
My host is X86 server of Intel 6148 and it can support kvm:
lsmod |grep kvm
kvm_intel 172032 0
kvm 548864 1 kvm_intel
irqbypass 16384 1 kvm
ll /dev/kvm
crwxrwxrwx 1 root root 10, 232 Feb 16 20:40 /dev/kvm
My GEM5 version is master(v21.0.0.0),
ea7d012c00e5555857ef999b88a8ec2bde801a1f
./build/X86/gem5.opt configs/example/se.py --cpu-type=X86KvmCPU
--cpu-clock=2.6GHz --sys-clock=2.6GHz --caches --l1d_size=64kB --l1i_size=64kB
--l2cache --l2_size=32MB --mem-size=32GB --num-cpus=1 -I 5000 -c "./test"
gem5 Simulator System. http://gem5.org
gem5 is copyrighted software; use the --copyright option for details.
gem5 version 21.0.0.0
gem5 compiled May 10 2021 03:39:51
gem5 started May 10 2021 03:57:48
gem5 executing on ubuntu, pid 112188
command line: ./build/X86/gem5.opt configs/example/se.py --cpu-type=X86KvmCPU
--cpu-clock=2.6GHz --sys-clock=2.6GHz --caches --l1d_size=64kB --l1i_size=64kB
--l2cache --l2_size=32MB --mem-size=32GB --num-cpus=1 -I 5000 -c ./test
warn: membus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: tol2bus.master is deprecated. `master` is now called `mem_side_ports`
warn: membus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: tol2bus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: tol2bus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: tol2bus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: tol2bus.slave is deprecated. `slave` is now called `cpu_side_ports`
warn: membus.master is deprecated. `master` is now called `mem_side_ports`
warn: membus.master is deprecated. `master` is now called `mem_side_ports`
warn: membus.slave is deprecated. `slave` is now called `cpu_side_ports`
Global frequency set at 1000000000000 ticks per second
warn: DRAM device capacity (8192 Mbytes) does not match the address range
assigned (32768 Mbytes)
0: system.remote_gdb: listening for remote gdb on port 7000
**** REAL SIMULATION ****
panic: KVM: Failed to create virtual CPU
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