From 5b494aea13fe9ec67365510c0d75835428cbb303 Mon Sep 17 00:00:00 2001 From: Peter Xu Date: Thu, 16 Apr 2020 11:59:06 -0400 Subject: KVM: No need to retry for hva_to_pfn_remapped() 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 Message-Id: <20200416155906.267462-1-peterx@redhat.com> Signed-off-by: Paolo Bonzini --- virt/kvm/kvm_main.c | 5 ----- 1 file changed, 5 deletions(-) (limited to 'virt') diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index e12317f32c5e..bef3d8d40685 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1831,8 +1831,6 @@ static int hva_to_pfn_remapped(struct vm_area_struct *vma, r = fixup_user_fault(current, current->mm, addr, (write_fault ? FAULT_FLAG_WRITE : 0), &unlocked); - if (unlocked) - return -EAGAIN; if (r) return r; @@ -1903,15 +1901,12 @@ static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async, goto exit; } -retry: vma = find_vma_intersection(current->mm, addr, addr + 1); if (vma == NULL) pfn = KVM_PFN_ERR_FAULT; else if (vma->vm_flags & (VM_IO | VM_PFNMAP)) { r = hva_to_pfn_remapped(vma, addr, async, write_fault, writable, &pfn); - if (r == -EAGAIN) - goto retry; if (r < 0) pfn = KVM_PFN_ERR_FAULT; } else { -- cgit v1.2.3