On 9/1/2022 10:23 PM, Sean Christopherson wrote:
On Wed, Aug 31, 2022, Yang Weijiang wrote:
The old patch series was queued in KVM/queue for a while and finally
moved to below branch after Paolo's refactor. This new patch set is
built on top of Paolo's work + some fixes, it's tested on legacy platform
Please elaborate on what was broken, i.e. why this was de-queued, as well as on
what was fixed an dhow. That will help bring me up to speed and expedite review.
Thanks Sean!
The de-queued reason I read from community is, the PEBS and Arch-LBR
patches broke
selftest/KUTs due to host-initiated 0 writes to PMU msrs. Paolo tried to
fix it but you
didn't agree on the solution. Plus your comments below:
On 6/1/2022 4:54 PM, Paolo Bonzini wrote:
> On 5/31/22 20:37, Sean Christopherson wrote:
>> Can we just punt this out of kvm/queue until its been properly reviewed?
> Yes, I agree. I have started making some changes and pushed the
> result to kvm/arch-lbr-for-weijiang.
What are fixed in this series:
1. An missing of -1: if ((entry->eax & 0xff) != (1 << (depth_bit - 1)))
2. Removed exit bit check in cpu_has_vmx_arch_lbr(void), moved it to
setup_vmcs_config().
3. A redundant check kvm_cpu_cap_has(X86_FEATURE_ARCH_LBR) in
kvm_check_cpuid().
4. KUT/selftest failures due to lack of MSR_ARCH_LBR_CTL and
MSR_ARCH_LBR_DEPTH in kvm_set_msr_common() before validate pmu msrs.
5. Calltrace in L1 when L1 tried to vmcs_write64(GUEST_IA32_LBR_CTL, 0)
in vmx_vcpu_reset(), use cpu_has_vmx_arch_lbr() instead.
6. Removed VM_ENTRY_LOAD_IA32_LBR_CTL and VM_EXIT_CLEAR_IA32_LBR_CTL
from exec_control in nested case.
