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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 27 Oct 2011 23:52:48 -0200
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Eric B Munson <emunson@...bm.net>
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 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?? :)

> +		r = 0;
> +		kvm_set_host_stopped(vcpu);
> +		break;
> +	}
>  	default:
>  		r = -EINVAL;
>  	}
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/