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    SubjectRe: [kvm-devel] [PATCH] Refactor hypercall infrastructure (v2)
    Date
    * Anthony Liguori wrote:
    > Amit Shah wrote:
    > > * Anthony Liguori wrote:
    > >  
    > >
    > >> This patch refactors the current hypercall infrastructure to better
    > >> support live migration and SMP.  It eliminates the hypercall page by
    > >> trapping the UD exception that would occur if you used the wrong
    > >> hypercall instruction for the underlying architecture and replacing it
    > >> with the right one lazily.
    > >
    > > This doesn't work right for SVM. It keeps looping indefinitely; on a
    > > kvm_stat run, I get about 230,000 light vm exits per second, with the
    > > hypercall never returning to the guest.
    > >
    > > ...
    > >  
    >
    > What are you using to issue the hypercall?

    + r = kvm_hypercall1(KVM_PV_PCI_DEVICE, page_gfn);

    Setup is done by:

    + if (!kvm_para_available()) {
    + printk(KERN_ERR "KVM paravirt support not available\n");
    + r = -ENODEV;
    + goto out_dereg;
    + }

    I also couldn't get the has_feature to work properly.

    See:

    http://lkml.org/lkml/2007/11/7/129

    I had to change the hypercall address to 0f 01 d9 for it to get working.

    >
    > Regards,
    >
    > Anthony Liguori


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