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Diffstat (limited to 'virt/kvm')
-rw-r--r--virt/kvm/kvm_main.c28
1 files changed, 24 insertions, 4 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 630d1224f18..b78b794c103 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -96,6 +96,9 @@ static bool largepages_enabled = true;
static struct page *hwpoison_page;
static pfn_t hwpoison_pfn;
+static struct page *fault_page;
+static pfn_t fault_pfn;
+
inline int kvm_is_mmio_pfn(pfn_t pfn)
{
if (pfn_valid(pfn)) {
@@ -815,13 +818,13 @@ EXPORT_SYMBOL_GPL(kvm_disable_largepages);
int is_error_page(struct page *page)
{
- return page == bad_page || page == hwpoison_page;
+ return page == bad_page || page == hwpoison_page || page == fault_page;
}
EXPORT_SYMBOL_GPL(is_error_page);
int is_error_pfn(pfn_t pfn)
{
- return pfn == bad_pfn || pfn == hwpoison_pfn;
+ return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn;
}
EXPORT_SYMBOL_GPL(is_error_pfn);
@@ -831,6 +834,12 @@ 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);
+
static inline unsigned long bad_hva(void)
{
return PAGE_OFFSET;
@@ -959,8 +968,8 @@ static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr)
if (vma == NULL || addr < vma->vm_start ||
!(vma->vm_flags & VM_PFNMAP)) {
up_read(&current->mm->mmap_sem);
- get_page(bad_page);
- return page_to_pfn(bad_page);
+ get_page(fault_page);
+ return page_to_pfn(fault_page);
}
pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
@@ -2226,6 +2235,15 @@ int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
hwpoison_pfn = page_to_pfn(hwpoison_page);
+ fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
+
+ if (fault_page == NULL) {
+ r = -ENOMEM;
+ goto out_free_0;
+ }
+
+ fault_pfn = page_to_pfn(fault_page);
+
if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
r = -ENOMEM;
goto out_free_0;
@@ -2298,6 +2316,8 @@ out_free_1:
out_free_0a:
free_cpumask_var(cpus_hardware_enabled);
out_free_0:
+ if (fault_page)
+ __free_page(fault_page);
if (hwpoison_page)
__free_page(hwpoison_page);
__free_page(bad_page);