linux-kernel - Re: [PATCH 3/6] Add ioctl for KVM_GUEST

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Date:	Fri, 28 Oct 2011 09:11:57 -0400
From:	Eric B Munson <emunson@...bm.net>
To:	Marcelo Tosatti <mtosatti@...hat.com>
Cc:	avi@...hat.com, mingo@...hat.com, x86@...nel.org, hpa@...or.com,
	arnd@...db.de, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	linux-arch@...r.kernel.org, ryanh@...ux.vnet.ibm.com,
	aliguori@...ibm.com
Subject: Re: [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@...bm.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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