linux-kernel - Re: [PATCH 10/15] KVM: MTRR: sort variable MTRRs

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Date:	Wed, 03 Jun 2015 10:31:07 +0800
From:	Xiao Guangrong <guangrong.xiao@...ux.intel.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
CC:	gleb@...nel.org, mtosatti@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 10/15] KVM: MTRR: sort variable MTRRs



On 06/01/2015 05:27 PM, Paolo Bonzini wrote:
>
>
> On 30/05/2015 12:59, Xiao Guangrong wrote:
>> Sort all valid variable MTRRs based on its base address, it will help us to
>> check a range to see if it's fully contained in variable MTRRs
>>
>> Signed-off-by: Xiao Guangrong <guangrong.xiao@...ux.intel.com>
>> ---
>>   arch/x86/include/asm/kvm_host.h |  3 +++
>>   arch/x86/kvm/mtrr.c             | 39 +++++++++++++++++++++++++++++++++++++++
>>   arch/x86/kvm/x86.c              |  2 +-
>>   arch/x86/kvm/x86.h              |  1 +
>>   4 files changed, 44 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
>> index f3fc152..5be8f2e 100644
>> --- a/arch/x86/include/asm/kvm_host.h
>> +++ b/arch/x86/include/asm/kvm_host.h
>> @@ -347,6 +347,7 @@ enum {
>>   struct kvm_mtrr_range {
>>   	u64 base;
>>   	u64 mask;
>> +	struct list_head node;
>>   };
>>
>>   struct kvm_mtrr {
>> @@ -362,6 +363,8 @@ struct kvm_mtrr {
>>   			unsigned mtrr_enabled:1;
>>   		};
>>   	};
>> +
>> +	struct list_head head;
>>   };
>>
>>   struct kvm_vcpu_arch {
>> diff --git a/arch/x86/kvm/mtrr.c b/arch/x86/kvm/mtrr.c
>> index aeb9767..8e3b81a 100644
>> --- a/arch/x86/kvm/mtrr.c
>> +++ b/arch/x86/kvm/mtrr.c
>> @@ -262,6 +262,38 @@ do_zap:
>>   	kvm_zap_gfn_range(vcpu->kvm, gpa_to_gfn(start), gpa_to_gfn(end));
>>   }
>>
>> +static bool var_mtrr_range_is_valid(struct kvm_mtrr_range *range)
>> +{
>> +	u64 start, end;
>> +
>> +	if (!(range->mask & (1 << 11)))
>> +		return false;
>> +
>> +	var_mtrr_range(range, &start, &end);
>> +	return end > start;
>> +}
>> +
>> +static void set_var_mtrr_start(struct kvm_mtrr *mtrr_state, int index)
>> +{
>> +	/* remove the entry if it's in the list. */
>> +	if (var_mtrr_range_is_valid(&mtrr_state->var_ranges[index]))
>> +		list_del(&mtrr_state->var_ranges[index].node);
>> +}
>> +
>> +static void set_var_mtrr_end(struct kvm_mtrr *mtrr_state, int index)
>> +{
>> +	struct kvm_mtrr_range *tmp, *cur = &mtrr_state->var_ranges[index];
>> +
>> +	/* add it to the list if it's valid. */
>> +	if (var_mtrr_range_is_valid(&mtrr_state->var_ranges[index])) {
>> +		list_for_each_entry(tmp, &mtrr_state->head, node)
>> +			if (cur->base < tmp->base)
>> +				list_add_tail(&cur->node, &tmp->node);
>> +
>> +		list_add_tail(&cur->node, &mtrr_state->head);
>> +	}
>> +}
>> +
>>   int kvm_mtrr_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
>>   {
>>   	int index;
>> @@ -281,10 +313,12 @@ int kvm_mtrr_set_msr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
>>
>>   		index = (msr - 0x200) / 2;
>>   		is_mtrr_mask = msr - 0x200 - 2 * index;
>> +		set_var_mtrr_start(&vcpu->arch.mtrr_state, index);
>>   		if (!is_mtrr_mask)
>>   			vcpu->arch.mtrr_state.var_ranges[index].base = data;
>>   		else
>>   			vcpu->arch.mtrr_state.var_ranges[index].mask = data;
>> +		set_var_mtrr_end(&vcpu->arch.mtrr_state, index);
>
> Just move the whole code to a new kvm_set_var_mtrr function.

Okay.

>
>>   	}
>>
>>   	update_mtrr(vcpu, msr);
>> @@ -331,6 +365,11 @@ int kvm_mtrr_get_msr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
>>   	return 0;
>>   }
>>
>> +void kvm_vcpu_mtrr_init(struct kvm_vcpu *vcpu)
>> +{
>> +	INIT_LIST_HEAD(&vcpu->arch.mtrr_state.head);
>> +}
>> +
>>   u8 kvm_mtrr_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn)
>>   {
>>   	struct kvm_mtrr *mtrr_state = &vcpu->arch.mtrr_state;
>> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
>> index 64c2891..8084ac3 100644
>> --- a/arch/x86/kvm/x86.c
>> +++ b/arch/x86/kvm/x86.c
>> @@ -6991,7 +6991,7 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
>>   	kvm_vcpu_reset(vcpu, false);
>>   	kvm_mmu_setup(vcpu);
>>   	vcpu_put(vcpu);
>> -
>> +	kvm_vcpu_mtrr_init(vcpu);
>
> Please move this call much earlier.

Okay, will do these in v2.

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