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authorLinus Torvalds <torvalds@linux-foundation.org>2011-04-07 11:33:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-04-07 11:33:04 -0700
commit7bc30c23c8ace3821a6732bfbe7e8f1b0995a63e (patch)
tree3440c323f331fb2c0b5e84c206b3c73d70826ee6 /virt
parentccfeef0ff76ebd632ae51bc56700f0072c4f1864 (diff)
parentbd22f5cfcfe8f68bf43b72daf4530cd7eedc9b7a (diff)
downloadlinux-stericsson-7bc30c23c8ace3821a6732bfbe7e8f1b0995a63e.tar.gz
Merge branch 'kvm-updates/2.6.39' of git://git.kernel.org/pub/scm/virt/kvm/kvm
* 'kvm-updates/2.6.39' of git://git.kernel.org/pub/scm/virt/kvm/kvm: KVM: move and fix substitue search for missing CPUID entries KVM: fix XSAVE bit scanning KVM: Enable async page fault processing KVM: fix crash on irqfd deassign
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/eventfd.c2
-rw-r--r--virt/kvm/kvm_main.c23
2 files changed, 22 insertions, 3 deletions
diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index 36d8092dbb3f..73358d256fa2 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -90,7 +90,7 @@ irqfd_shutdown(struct work_struct *work)
* We know no new events will be scheduled at this point, so block
* until all previously outstanding events have completed
*/
- flush_work(&irqfd->inject);
+ flush_work_sync(&irqfd->inject);
/*
* It is now safe to release the object's resources
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 556e3efe5325..6330653480e4 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1037,6 +1037,17 @@ static pfn_t get_fault_pfn(void)
return fault_pfn;
}
+int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
+ unsigned long start, int write, struct page **page)
+{
+ int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
+
+ if (write)
+ flags |= FOLL_WRITE;
+
+ return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
+}
+
static inline int check_user_page_hwpoison(unsigned long addr)
{
int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
@@ -1070,7 +1081,14 @@ static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic,
if (writable)
*writable = write_fault;
- npages = get_user_pages_fast(addr, 1, write_fault, page);
+ if (async) {
+ down_read(&current->mm->mmap_sem);
+ npages = get_user_page_nowait(current, current->mm,
+ addr, write_fault, page);
+ up_read(&current->mm->mmap_sem);
+ } else
+ npages = get_user_pages_fast(addr, 1, write_fault,
+ page);
/* map read fault as writable if possible */
if (unlikely(!write_fault) && npages == 1) {
@@ -1093,7 +1111,8 @@ static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic,
return get_fault_pfn();
down_read(&current->mm->mmap_sem);
- if (check_user_page_hwpoison(addr)) {
+ if (npages == -EHWPOISON ||
+ (!async && check_user_page_hwpoison(addr))) {
up_read(&current->mm->mmap_sem);
get_page(hwpoison_page);
return page_to_pfn(hwpoison_page);