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    SubjectRe: [PATCH 3/6] Add ioctl for KVM_GUEST_STOPPED
    On Thu, 27 Oct 2011, Marcelo Tosatti wrote:

    > On Tue, Oct 25, 2011 at 03:26:16PM -0400, Eric B Munson wrote:
    > > Now that we have a flag that will tell the guest it was suspended, create an
    > > interface for that communication using a KVM ioctl.
    > >
    > > Signed-off-by: Eric B Munson <emunson@mgebm.net>
    > > ---
    > > arch/x86/include/asm/pvclock.h | 3 +++
    > > arch/x86/kernel/kvmclock.c | 12 ++++++++++++
    > > arch/x86/kvm/x86.c | 5 +++++
    > > include/linux/kvm.h | 2 ++
    > > 4 files changed, 22 insertions(+), 0 deletions(-)
    > >
    > > diff --git a/arch/x86/include/asm/pvclock.h b/arch/x86/include/asm/pvclock.h
    > > index 7d3ba41..9312814 100644
    > > --- a/arch/x86/include/asm/pvclock.h
    > > +++ b/arch/x86/include/asm/pvclock.h
    > > @@ -3,6 +3,7 @@
    > >
    > > #include <linux/clocksource.h>
    > > #include <asm/pvclock-abi.h>
    > > +#include <linux/kvm_host.h>
    > >
    > > /* some helper functions for xen and kvm pv clock sources */
    > > cycle_t pvclock_clocksource_read(struct pvclock_vcpu_time_info *src);
    > > @@ -13,6 +14,8 @@ void pvclock_read_wallclock(struct pvclock_wall_clock *wall,
    > > struct timespec *ts);
    > > void pvclock_resume(void);
    > >
    > > +void kvm_set_host_stopped(struct kvm_vcpu *vcpu);
    > > +
    > > bool kvm_check_and_clear_host_stopped(int cpu);
    > >
    > > /*
    > > diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c
    > > index 8ddcfaf..f4fff3d 100644
    > > --- a/arch/x86/kernel/kvmclock.c
    > > +++ b/arch/x86/kernel/kvmclock.c
    > > @@ -22,6 +22,7 @@
    > > #include <asm/msr.h>
    > > #include <asm/apic.h>
    > > #include <linux/percpu.h>
    > > +#include <linux/kvm_host.h>
    > >
    > > #include <asm/x86_init.h>
    > > #include <asm/reboot.h>
    > > @@ -113,6 +114,17 @@ static void kvm_get_preset_lpj(void)
    > > preset_lpj = lpj;
    > > }
    > >
    > > +/*
    > > + * kvm_set_host_stopped() indicates to the guest kernel that it has been
    > > + * stopped by the hypervisor. This function will be called from the host only.
    > > + */
    > > +void kvm_set_host_stopped(struct kvm_vcpu *vcpu)
    > > +{
    > > + struct pvclock_vcpu_time_info *src = &vcpu->arch.hv_clock;
    > > + src->flags |= PVCLOCK_GUEST_STOPPED;
    > > +}
    > > +EXPORT_SYMBOL_GPL(kvm_set_host_stopped);
    > > +
    > > bool kvm_check_and_clear_host_stopped(int cpu)
    > > {
    > > bool ret = false;
    > > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
    > > index 84a28ea..16e029e 100644
    > > --- a/arch/x86/kvm/x86.c
    > > +++ b/arch/x86/kvm/x86.c
    > > @@ -3264,6 +3264,11 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
    > >
    > > goto out;
    > > }
    > > + case KVM_PAUSE_GUEST: {
    >
    > Pause guest?? :)

    GUEST_PAUSED for the next version.

    >
    > > + r = 0;
    > > + kvm_set_host_stopped(vcpu);
    > > + break;
    > > + }
    > > default:
    > > r = -EINVAL;
    > > }
    >
    [unhandled content-type:application/pgp-signature]
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