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SubjectRe: [PATCH v2 10/16] KVM: MMU: fask check whether page is writable
On 04/14/2012 11:01 AM, Takuya Yoshikawa wrote:

> On Fri, 13 Apr 2012 18:14:26 +0800
> Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> wrote:
>
>> Using bit 1 (PTE_LIST_WP_BIT) in rmap store the write-protect status
>> to avoid unnecessary shadow page walking
>>
>> Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
>> ---
>> arch/x86/kvm/mmu.c | 40 ++++++++++++++++++++++++++++++++++------
>> 1 files changed, 34 insertions(+), 6 deletions(-)
>>
>> diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
>> index 0c6e92d..8b71908 100644
>> --- a/arch/x86/kvm/mmu.c
>> +++ b/arch/x86/kvm/mmu.c
>> @@ -796,7 +796,9 @@ static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn)
>> return level - 1;
>> }
>>
>> -#define PTE_LIST_DESC (0x1ull)
>> +#define PTE_LIST_DESC_BIT 0
>> +#define PTE_LIST_WP_BIT 1
>
> _BIT ?


What is the problem?

>
>> @@ -2291,9 +2310,15 @@ static int mmu_need_write_protect(struct kvm_vcpu *vcpu, gfn_t gfn,
>> {
>> struct kvm_mmu_page *s;
>> struct hlist_node *node;
>> + unsigned long *rmap;
>> bool need_unsync = false;
>>
>> + rmap = gfn_to_rmap(vcpu->kvm, gfn, PT_PAGE_TABLE_LEVEL);
>
> Please use consistent variable names.
>
> In other parts of this patch, you are using rmapp for this.


Okay.



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