[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Dump VMCS on Intel CPU
On 06/06/2009 04:06, "Mukesh Rathor" <mukesh.rathor@xxxxxxxxxx> wrote: > On AMD, it was simple by calling svm_dump_vmcb() by passing vmcb from > each vcpu struct. Looking at vmcs.c, I see quite a bit of mumbo-jumbo in > terms of setting context, even IPI other CPUs, etc. That doesn't work > for me. So the question is, is there any reason followig won't work? > > for each hvm vcpu { > __vmptrld(virt_to_maddr(vp->arch.hvm_vmx.vmcs)); > vmcs_dump_vcpu(); > } > if ( is_hvm_vcpu(current) ) > __vmptrld(virt_to_maddr(current->arch.hvm_vmx.vmcs)); > > > Seems to work ok, but I want to make sure. Intel say you should VMCLEAR on the last CPU to VMPTRLD the VMCS. For us that means if v->arch.hvm_vmx.active_cpu != smp_processor_id() nor -1. However VMPTRLD is not described as failing if this is not carried out. So, I guess you may get away with it. If you want to be super safe you might VMCLEAR on CPUs as they rendezvous with kdb. -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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