[qemu] Add custom kvm cpu args support #113
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When improve `bpf_get_branch_snapshot()` helper, it requires passing LBR into the VM like `-cpu,host,pmu=on,lbr-fmt=0x5`. Then, in the VM, confirm the LBR is supported: ```bash root@(none):/# dmesg | grep -i lbr [ 0.394406] Performance Events: Skylake events, 32-deep LBR, full-width counters, Intel PMU driver. ``` With this commit, the VM can be created by `vmtest -k $(make -s image_name) --kvm-cpu-args 'host,pmu=on,lbr-fmt=0x5' -`. Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
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When improve
bpf_get_branch_snapshot()helper, it requires passing LBR into the VM like-cpu,host,pmu=on,lbr-fmt=0x5.Then, in the VM, confirm the LBR is supported:
With this commit, the VM can be created by
vmtest -k $(make -s image_name) --kvm-cpu-args 'host,pmu=on,lbr-fmt=0x5' -.