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KVM: No need to retry for hva_to_pfn_remapped()

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hva_to_pfn_remapped() calls fixup_user_fault(), which has already
handled the retry gracefully.  Even if "unlocked" is set to true, it
means that we've got a VM_FAULT_RETRY inside fixup_user_fault(),
however the page fault has already retried and we should have the pfn
set correctly.  No need to do that again.

Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <20200416155906.267462-1-peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Xu 2020-04-16 11:59:06 -04:00 committed by Paolo Bonzini
parent dd03bcaad0
commit 5b494aea13
1 changed files with 0 additions and 5 deletions
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5
virt/kvm/kvm_main.c
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@ -1831,8 +1831,6 @@ static int hva_to_pfn_remapped(struct vm_area_struct *vma,
r = fixup_user_fault(current, current->mm, addr, r = fixup_user_fault(current, current->mm, addr,
(write_fault ? FAULT_FLAG_WRITE : 0), (write_fault ? FAULT_FLAG_WRITE : 0),
&unlocked); &unlocked);
if (unlocked)
return -EAGAIN;
if (r) if (r)
return r; return r;
@ -1903,15 +1901,12 @@ static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
goto exit; goto exit;
} }
retry:
vma = find_vma_intersection(current->mm, addr, addr + 1); vma = find_vma_intersection(current->mm, addr, addr + 1);
if (vma == NULL) if (vma == NULL)
pfn = KVM_PFN_ERR_FAULT; pfn = KVM_PFN_ERR_FAULT;
else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) { else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) {
r = hva_to_pfn_remapped(vma, addr, async, write_fault, writable, &pfn); r = hva_to_pfn_remapped(vma, addr, async, write_fault, writable, &pfn);
if (r == -EAGAIN)
goto retry;
if (r < 0) if (r < 0)
pfn = KVM_PFN_ERR_FAULT; pfn = KVM_PFN_ERR_FAULT;
} else { } else {