Re: [PATCH v2 0/2] x86: clear vmcss on all cpus when doing kdumpif necessary

[zhangyanfei]

Would anyone help review the patch, and give some comments, please ? 

Avi?

ä 2012å10æ19æ 13:41, Zhang Yanfei åé:
> Currently, kdump just makes all the logical processors leave VMX operation by
> executing VMXOFF instruction, so any VMCSs active on the logical processors may
> be corrupted. But, sometimes, we need the VMCSs to debug guest images contained
> in the host vmcore. To prevent the corruption, we should VMCLEAR the VMCSs before
> executing the VMXOFF instruction.
> 
> The patch set provides a way to VMCLEAR vmcss related to guests on all cpus before
> executing the VMXOFF when doing kdump. This is used to ensure the VMCSs in the
> vmcore updated and non-corrupted.
> 
> Changelog from v1 to v2:
> 1. remove the sysctl and clear VMCSs unconditionally.
> 
> zhangyanfei (2):
>   x86/kexec: VMCLEAR vmcss on all cpus if necessary
>   KVM: make crash_clear_loaded_vmcss valid when loading kvm_intel
>     module
> 
>  arch/x86/include/asm/kexec.h |    2 ++
>  arch/x86/kernel/crash.c      |   27 +++++++++++++++++++++++++++
>  arch/x86/kvm/vmx.c           |    9 +++++++++
>  3 files changed, 38 insertions(+), 0 deletions(-)
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