[PATCH 6/9] KVM: using get_fault_pfn to get the fault pfn
From: Xiao Guangrong <hidden>
Date: 2012-07-17 13:54:22
Also in:
lkml
Subsystem:
kernel virtual machine (kvm), kernel virtual machine for x86 (kvm/x86), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Paolo Bonzini, Sean Christopherson, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
Using get_fault_pfn to cleanup the code Signed-off-by: Xiao Guangrong <redacted> --- arch/x86/kvm/mmu.c | 6 ++---- include/linux/kvm_host.h | 5 +---- virt/kvm/kvm_main.c | 13 ++++--------- 3 files changed, 7 insertions(+), 17 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index a846a9c..e23cdae 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c@@ -2483,10 +2483,8 @@ static pfn_t pte_prefetch_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn, unsigned long hva; slot = gfn_to_memslot_dirty_bitmap(vcpu, gfn, no_dirty_log); - if (!slot) { - get_page(fault_page); - return page_to_pfn(fault_page); - } + if (!slot) + return get_fault_pfn(); hva = gfn_to_hva_memslot(slot, gfn);
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index e3c86f8..258b35a 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h@@ -383,15 +383,11 @@ id_to_memslot(struct kvm_memslots *slots, int id) static inline int is_error_hpa(hpa_t hpa) { return hpa >> HPA_MSB; } extern struct page *bad_page; -extern struct page *fault_page; - extern pfn_t bad_pfn; -extern pfn_t fault_pfn; int is_error_page(struct page *page); int is_error_pfn(pfn_t pfn); int is_hwpoison_pfn(pfn_t pfn); -int is_fault_pfn(pfn_t pfn); int is_noslot_pfn(pfn_t pfn); int is_invalid_pfn(pfn_t pfn); int kvm_is_error_hva(unsigned long addr);
@@ -441,6 +437,7 @@ void kvm_release_pfn_clean(pfn_t pfn); void kvm_set_pfn_dirty(pfn_t pfn); void kvm_set_pfn_accessed(pfn_t pfn); void kvm_get_pfn(pfn_t pfn); +pfn_t get_fault_pfn(void); int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset, int len);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 60af030..feef72e 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c@@ -103,8 +103,8 @@ static bool largepages_enabled = true; static struct page *hwpoison_page; static pfn_t hwpoison_pfn; -struct page *fault_page; -pfn_t fault_pfn; +static struct page *fault_page; +static pfn_t fault_pfn; inline int kvm_is_mmio_pfn(pfn_t pfn) {
@@ -950,12 +950,6 @@ int is_hwpoison_pfn(pfn_t pfn) } EXPORT_SYMBOL_GPL(is_hwpoison_pfn); -int is_fault_pfn(pfn_t pfn) -{ - return pfn == fault_pfn; -} -EXPORT_SYMBOL_GPL(is_fault_pfn); - int is_noslot_pfn(pfn_t pfn) { return pfn == bad_pfn;
@@ -1039,11 +1033,12 @@ unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) } EXPORT_SYMBOL_GPL(gfn_to_hva); -static pfn_t get_fault_pfn(void) +pfn_t get_fault_pfn(void) { get_page(fault_page); return fault_pfn; } +EXPORT_SYMBOL_GPL(get_fault_pfn); int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, int write, struct page **page)
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1.7.7.6