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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;
> > }
>
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