linux-kernel - Re: [PATCHv2] arch:x86:kvm:Add function for setting pending timer on virtual cpu in x86.c

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Date:	Thu, 08 Jan 2015 12:57:15 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Nicholas Krause <xerofoify@...il.com>, gleb@...nel.org
CC:	x86@...nel.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2] arch:x86:kvm:Add function for setting pending timer
 on virtual cpu in x86.c



On 02/01/2015 04:05, Nicholas Krause wrote:
> Adds the function kvm_vcpu_set_pending_timer for setting a pending timer on a virtual cpu for x86 systems.  This
> function calls kvm_make_request internally as moved over from lapic.c with the arugments of the virtual cpu passed
> to the function kvm_vcpu_set_pending_timer and the flag of KVM_REQ_PENDING_TIMER for requesting a pending timer
> to kvm. In additon we added a function prototype definition as to allow this function to be used by any files that
> include the header file,x86.h and need to set the pending timer on a virtual cpu supported by kvm.
> Signed-off-by: Nicholas Krause <xerofoify@...il.com>
> ---
>  arch/x86/kvm/lapic.c | 3 +--
>  arch/x86/kvm/x86.c   | 3 +++
>  arch/x86/kvm/x86.h   | 1 +
>  3 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> index 4f0c0b9..6d69b49 100644
> --- a/arch/x86/kvm/lapic.c
> +++ b/arch/x86/kvm/lapic.c
> @@ -1082,8 +1082,7 @@ static void apic_timer_expired(struct kvm_lapic *apic)
>  		return;
>  
>  	atomic_inc(&apic->lapic_timer.pending);
> -	/* FIXME: this code should not know anything about vcpus */
> -	kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu);
> +	kvm_set_pending_timer(vcpu);
>  
>  	if (waitqueue_active(q))
>  		wake_up_interruptible(q);
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index c259814..7f8d048 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -1083,6 +1083,9 @@ static void update_pvclock_gtod(struct timekeeper *tk)

The patch didn't apply as is because the ",9" should have been ",10".

Fixed up and applied.

Paolo

>  }
>  #endif
>  
> +void kvm_set_pending_timer(struct kvm_vcpu *vcpu)
> +{
> +	kvm_make_request(KVM_REQ_PENDING_TIMER, vcpu);
> +}
>  
>  static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
>  {
> diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
> index cc1d61a..4b7a819 100644
> --- a/arch/x86/kvm/x86.h
> +++ b/arch/x86/kvm/x86.h
> @@ -147,6 +147,7 @@ static inline void kvm_register_writel(struct kvm_vcpu *vcpu,
>  
>  void kvm_before_handle_nmi(struct kvm_vcpu *vcpu);
>  void kvm_after_handle_nmi(struct kvm_vcpu *vcpu);
> +void kvm_set_pending_timer(struct kvm_vcpu *vcpu);
>  int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip);
>  
>  void kvm_write_tsc(struct kvm_vcpu *vcpu, struct msr_data *msr);
> 

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