linux-kernel - Re: [PATCH v7 04/17] KVM: Get Posted-Interrupts descriptor address from 'struct kvm

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Date:	Fri, 11 Sep 2015 12:50:11 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Feng Wu <feng.wu@...el.com>, alex.williamson@...hat.com,
	joro@...tes.org, mtosatti@...hat.com
Cc:	eric.auger@...aro.org, kvm@...r.kernel.org,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 04/17] KVM: Get Posted-Interrupts descriptor address
 from 'struct kvm_vcpu'



On 25/08/2015 10:50, Feng Wu wrote:
> Define an interface to get PI descriptor address from the vCPU structure.
> 
> Signed-off-by: Feng Wu <feng.wu@...el.com>

See the later review, this interface and the one in patch 5 is too
low-level.

Paolo

> ---
>  arch/x86/include/asm/kvm_host.h |  2 ++
>  arch/x86/kvm/vmx.c              | 11 +++++++++++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index af11bca..d50c1d3 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -858,6 +858,8 @@ struct kvm_x86_ops {
>  	void (*enable_log_dirty_pt_masked)(struct kvm *kvm,
>  					   struct kvm_memory_slot *slot,
>  					   gfn_t offset, unsigned long mask);
> +
> +	u64 (*get_pi_desc_addr)(struct kvm_vcpu *vcpu);
>  	/* pmu operations of sub-arch */
>  	const struct kvm_pmu_ops *pmu_ops;
>  };
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index 316f9bf..81a995c 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -610,6 +610,10 @@ static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu)
>  #define FIELD64(number, name)	[number] = VMCS12_OFFSET(name), \
>  				[number##_HIGH] = VMCS12_OFFSET(name)+4
>  
> +struct pi_desc *vcpu_to_pi_desc(struct kvm_vcpu *vcpu)
> +{
> +	return &(to_vmx(vcpu)->pi_desc);
> +}
>  
>  static unsigned long shadow_read_only_fields[] = {
>  	/*
> @@ -4487,6 +4491,11 @@ static void vmx_sync_pir_to_irr_dummy(struct kvm_vcpu *vcpu)
>  	return;
>  }
>  
> +static u64 vmx_get_pi_desc_addr(struct kvm_vcpu *vcpu)
> +{
> +	return __pa((u64)vcpu_to_pi_desc(vcpu));
> +}
> +
>  /*
>   * Set up the vmcs's constant host-state fields, i.e., host-state fields that
>   * will not change in the lifetime of the guest.
> @@ -10460,6 +10469,8 @@ static struct kvm_x86_ops vmx_x86_ops = {
>  	.flush_log_dirty = vmx_flush_log_dirty,
>  	.enable_log_dirty_pt_masked = vmx_enable_log_dirty_pt_masked,
>  
> +	.get_pi_desc_addr = vmx_get_pi_desc_addr,
> +
>  	.pmu_ops = &intel_pmu_ops,
>  };
>  
> 
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