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SubjectRe: [PATCH 3/6] Add ioctl for KVM_GUEST_STOPPED
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?? :)

> + r = 0;
> + kvm_set_host_stopped(vcpu);
> + break;
> + }
> default:
> r = -EINVAL;
> }


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