On 06/14/2011 08:03 PM, Takuya Yoshikawa wrote:
From: Takuya Yoshikawa<[email protected]>
Introduce two new helpers: set_accessed_bit() and is_last_gpte().
These names were suggested by Ingo and Avi.
Cc: Ingo Molnar<[email protected]>
Signed-off-by: Takuya Yoshikawa<[email protected]>
---
arch/x86/kvm/paging_tmpl.h | 57 ++++++++++++++++++++++++++++++++-----------
1 files changed, 42 insertions(+), 15 deletions(-)
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 92fe275..d655a4b6 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -113,6 +113,43 @@ static unsigned FNAME(gpte_access)(struct kvm_vcpu *vcpu,
pt_element_t gpte)
return access;
}
+static int FNAME(set_accessed_bit)(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
+ gfn_t table_gfn, unsigned index,
+ pt_element_t __user *ptep_user,
+ pt_element_t *ptep)
+{
+ int ret;
+
+ trace_kvm_mmu_set_accessed_bit(table_gfn, index, sizeof(*ptep));
+ ret = FNAME(cmpxchg_gpte)(vcpu, mmu, ptep_user, index,
+ *ptep, *ptep|PT_ACCESSED_MASK);
+ if (unlikely(ret))
+ return ret;
+
+ mark_page_dirty(vcpu->kvm, table_gfn);
+ *ptep |= PT_ACCESSED_MASK;
+
+ return 0;
+}
I don't think this one is worthwhile, it takes 7 parameters! If there's
so much communication between caller and callee, it means they are too
heavily tied up.
+
+static bool FNAME(is_last_gpte)(struct guest_walker *walker,
+ struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
+ pt_element_t gpte)
+{
+ if (walker->level == PT_PAGE_TABLE_LEVEL)
+ return true;
+
+ if ((walker->level == PT_DIRECTORY_LEVEL)&& is_large_pte(gpte)&&
+ (PTTYPE == 64 || is_pse(vcpu)))
+ return true;
+
+ if ((walker->level == PT_PDPE_LEVEL)&& is_large_pte(gpte)&&
+ (mmu->root_level == PT64_ROOT_LEVEL))
+ return true;
+
+ return false;
+}
+
This one is much better.
--
error compiling committee.c: too many arguments to function
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