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-rw-r--r--include/linux/kvm_host.h11
-rw-r--r--virt/kvm/async_pf.c2
-rw-r--r--virt/kvm/kvm_main.c50
3 files changed, 5 insertions, 58 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 26f106022c88..d189ee098aa2 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -200,17 +200,6 @@ int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, unsigned long hva,
int kvm_async_pf_wakeup_all(struct kvm_vcpu *vcpu);
#endif
-/*
- * Carry out a gup that requires IO. Allow the mm to relinquish the mmap
- * semaphore if the filemap/swap has to wait on a page lock. pagep == NULL
- * controls whether we retry the gup one more time to completion in that case.
- * Typically this is called after a FAULT_FLAG_RETRY_NOWAIT in the main tdp
- * handler.
- */
-int kvm_get_user_page_io(struct task_struct *tsk, struct mm_struct *mm,
- unsigned long addr, bool write_fault,
- struct page **pagep);
-
enum {
OUTSIDE_GUEST_MODE,
IN_GUEST_MODE,
diff --git a/virt/kvm/async_pf.c b/virt/kvm/async_pf.c
index 5ff7f7f2689a..44660aee335f 100644
--- a/virt/kvm/async_pf.c
+++ b/virt/kvm/async_pf.c
@@ -80,7 +80,7 @@ static void async_pf_execute(struct work_struct *work)
might_sleep();
- kvm_get_user_page_io(NULL, mm, addr, 1, NULL);
+ get_user_pages_unlocked(NULL, mm, addr, 1, 1, 0, NULL);
kvm_async_page_present_sync(vcpu, apf);
spin_lock(&vcpu->async_pf.lock);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 1cc6e2e19982..458b9b14b15c 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1128,43 +1128,6 @@ static int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
}
-int kvm_get_user_page_io(struct task_struct *tsk, struct mm_struct *mm,
- unsigned long addr, bool write_fault,
- struct page **pagep)
-{
- int npages;
- int locked = 1;
- int flags = FOLL_TOUCH | FOLL_HWPOISON |
- (pagep ? FOLL_GET : 0) |
- (write_fault ? FOLL_WRITE : 0);
-
- /*
- * If retrying the fault, we get here *not* having allowed the filemap
- * to wait on the page lock. We should now allow waiting on the IO with
- * the mmap semaphore released.
- */
- down_read(&mm->mmap_sem);
- npages = __get_user_pages(tsk, mm, addr, 1, flags, pagep, NULL,
- &locked);
- if (!locked) {
- VM_BUG_ON(npages);
-
- if (!pagep)
- return 0;
-
- /*
- * The previous call has now waited on the IO. Now we can
- * retry and complete. Pass TRIED to ensure we do not re
- * schedule async IO (see e.g. filemap_fault).
- */
- down_read(&mm->mmap_sem);
- npages = __get_user_pages(tsk, mm, addr, 1, flags | FOLL_TRIED,
- pagep, NULL, NULL);
- }
- up_read(&mm->mmap_sem);
- return npages;
-}
-
static inline int check_user_page_hwpoison(unsigned long addr)
{
int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
@@ -1227,15 +1190,10 @@ static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
npages = get_user_page_nowait(current, current->mm,
addr, write_fault, page);
up_read(&current->mm->mmap_sem);
- } else {
- /*
- * By now we have tried gup_fast, and possibly async_pf, and we
- * are certainly not atomic. Time to retry the gup, allowing
- * mmap semaphore to be relinquished in the case of IO.
- */
- npages = kvm_get_user_page_io(current, current->mm, addr,
- write_fault, page);
- }
+ } else
+ npages = __get_user_pages_unlocked(current, current->mm, addr, 1,
+ write_fault, 0, page,
+ FOLL_TOUCH|FOLL_HWPOISON);
if (npages != 1)
return npages;