linux-kernel - Re: [PATCH v4 1/6] kvm: Use APIC_DEFAULT_PHYS_BASE macro as the apic access page address.

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Date:	Wed, 10 Sep 2014 16:57:16 +0300
From:	Gleb Natapov <gleb@...nel.org>
To:	Tang Chen <tangchen@...fujitsu.com>
Cc:	mtosatti@...hat.com, nadav.amit@...il.com, jan.kiszka@....de,
	kvm@...r.kernel.org, laijs@...fujitsu.com,
	isimatu.yasuaki@...fujitsu.com, guz.fnst@...fujitsu.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/6] kvm: Use APIC_DEFAULT_PHYS_BASE macro as the apic
 access page address.

On Wed, Aug 27, 2014 at 06:17:36PM +0800, Tang Chen wrote:
> We have APIC_DEFAULT_PHYS_BASE defined as 0xfee00000, which is also the address of
> apic access page. So use this macro.
Reviewed-by: Gleb Natapov <gleb@...nel.org>

> 
> Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
> ---
>  arch/x86/kvm/svm.c | 3 ++-
>  arch/x86/kvm/vmx.c | 6 +++---
>  2 files changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
> index ddf7427..1d941ad 100644
> --- a/arch/x86/kvm/svm.c
> +++ b/arch/x86/kvm/svm.c
> @@ -1257,7 +1257,8 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
>  	svm->asid_generation = 0;
>  	init_vmcb(svm);
>  
> -	svm->vcpu.arch.apic_base = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
> +	svm->vcpu.arch.apic_base = APIC_DEFAULT_PHYS_BASE |
> +				   MSR_IA32_APICBASE_ENABLE;
>  	if (kvm_vcpu_is_bsp(&svm->vcpu))
>  		svm->vcpu.arch.apic_base |= MSR_IA32_APICBASE_BSP;
>  
> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
> index bfe11cf..4b80ead 100644
> --- a/arch/x86/kvm/vmx.c
> +++ b/arch/x86/kvm/vmx.c
> @@ -3999,13 +3999,13 @@ static int alloc_apic_access_page(struct kvm *kvm)
>  		goto out;
>  	kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
>  	kvm_userspace_mem.flags = 0;
> -	kvm_userspace_mem.guest_phys_addr = 0xfee00000ULL;
> +	kvm_userspace_mem.guest_phys_addr = APIC_DEFAULT_PHYS_BASE;
>  	kvm_userspace_mem.memory_size = PAGE_SIZE;
>  	r = __kvm_set_memory_region(kvm, &kvm_userspace_mem);
>  	if (r)
>  		goto out;
>  
> -	page = gfn_to_page(kvm, 0xfee00);
> +	page = gfn_to_page(kvm, APIC_DEFAULT_PHYS_BASE >> PAGE_SHIFT);
>  	if (is_error_page(page)) {
>  		r = -EFAULT;
>  		goto out;
> @@ -4477,7 +4477,7 @@ static void vmx_vcpu_reset(struct kvm_vcpu *vcpu)
>  
>  	vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val();
>  	kvm_set_cr8(&vmx->vcpu, 0);
> -	apic_base_msr.data = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
> +	apic_base_msr.data = APIC_DEFAULT_PHYS_BASE | MSR_IA32_APICBASE_ENABLE;
>  	if (kvm_vcpu_is_bsp(&vmx->vcpu))
>  		apic_base_msr.data |= MSR_IA32_APICBASE_BSP;
>  	apic_base_msr.host_initiated = true;
> -- 
> 1.8.3.1
> 

--
			Gleb.
--
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