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    SubjectRe: [PATCH 23/42] KVM: Activate Virtualization On Demand
    Am 16.11.2009 13:19, schrieb Avi Kivity:
    > From: Alexander Graf <agraf@suse.de>
    > diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
    > index f54c4f9..59fe4d5 100644
    > --- a/arch/x86/kvm/svm.c
    > +++ b/arch/x86/kvm/svm.c
    > @@ -316,7 +316,7 @@ static void svm_hardware_disable(void *garbage)
    > cpu_svm_disable();
    > }
    >
    > -static void svm_hardware_enable(void *garbage)
    > +static int svm_hardware_enable(void *garbage)
    > {
    >
    > struct svm_cpu_data *svm_data;
    > @@ -325,16 +325,20 @@ static void svm_hardware_enable(void *garbage)
    > struct desc_struct *gdt;
    > int me = raw_smp_processor_id();
    >
    > + rdmsrl(MSR_EFER, efer);
    > + if (efer & EFER_SVME)
    > + return -EBUSY;
    > +

    Hi,

    This is breaking KVM on my Phenom II X4 955.

    When I start kvm I get this on the terminal:

    kvm_create_vm: Device or resource busy
    Could not initialize KVM, will disable KVM support

    And in dmesg:
    [ 67.980732] kvm: enabling virtualization on CPU0 failed


    I commented out the if() and return, and I added 2 printk's there for
    debugging, and now that's what I see in dmesg when I start kvm:

    [ 3341.740112] efer is 3329
    [ 3341.740113] efer is 3329
    [ 3341.740117] efer is 3329
    [ 3341.740119] EFER_SVME is 4096
    [ 3341.740121] EFER_SVME is 4096
    [ 3341.740124] EFER_SVME is 4096
    [ 3341.740130] efer is 3329
    [ 3341.740132] EFER_SVME is 4096

    In hex the values are 0x1000 and 0x0d01

    KVM has been working well on this machine before, and it still works
    well after commenting that part out.

    I am not sure what the value of this register is supposed to be, but are
    you sure

    if (efer & EFER_SVME)

    is the right condition?



    cu
    Dieter


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