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dkim=none ("invalid DKIM record") header.d=intel.com header.s=Intel header.b=P0wEeEB1; spf=pass (imf26.hostedemail.com: domain of yonghua.huang@intel.com designates 192.55.52.93 as permitted sender) smtp.mailfrom=yonghua.huang@intel.com; dmarc=pass (policy=none) header.from=intel.com; arc=pass ("microsoft.com:s=arcselector9901:i=1") X-Stat-Signature: 66wnenp9s3oncsojitqrbgsi7486dbrr X-HE-Tag: 1663763037-967081 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi Daniel, Thank you for this info, we will fix this issue. Almost miss this mail, sorry! -Yonghua > -----Original Message----- > From: Daniel Vetter > Sent: Wednesday, August 10, 2022 20:20 > To: Huang, Yonghua > Cc: gregkh@linuxfoundation.org; linux-kernel@vger.kernel.org; > stable@vger.kernel.org; Chatre, Reinette ; Wan= g, > Zhi A ; Wang, Yu1 ; Li, Fei1 > ; Linux MM ; DRI Development devel@lists.freedesktop.org> > Subject: Re: [PATCH] virt: acrn: obtain pa from VMA with PFNMAP flag >=20 > On Mon, Feb 28, 2022 at 05:22:12AM +0300, Yonghua Huang wrote: > > acrn_vm_ram_map can't pin the user pages with VM_PFNMAP flag by > > calling get_user_pages_fast(), the PA(physical pages) may be mapped > > by kernel driver and set PFNMAP flag. > > > > This patch fixes logic to setup EPT mapping for PFN mapped RAM region > > by checking the memory attribute before adding EPT mapping for them. > > > > Fixes: 88f537d5e8dd ("virt: acrn: Introduce EPT mapping management") > > Signed-off-by: Yonghua Huang > > Signed-off-by: Fei Li > > --- > > drivers/virt/acrn/mm.c | 24 ++++++++++++++++++++++++ > > 1 file changed, 24 insertions(+) > > > > diff --git a/drivers/virt/acrn/mm.c b/drivers/virt/acrn/mm.c index > > c4f2e15c8a2b..3b1b1e7a844b 100644 > > --- a/drivers/virt/acrn/mm.c > > +++ b/drivers/virt/acrn/mm.c > > @@ -162,10 +162,34 @@ int acrn_vm_ram_map(struct acrn_vm *vm, struct > acrn_vm_memmap *memmap) > > void *remap_vaddr; > > int ret, pinned; > > u64 user_vm_pa; > > + unsigned long pfn; > > + struct vm_area_struct *vma; > > > > if (!vm || !memmap) > > return -EINVAL; > > > > + mmap_read_lock(current->mm); > > + vma =3D vma_lookup(current->mm, memmap->vma_base); > > + if (vma && ((vma->vm_flags & VM_PFNMAP) !=3D 0)) { > > + if ((memmap->vma_base + memmap->len) > vma->vm_end) { > > + mmap_read_unlock(current->mm); > > + return -EINVAL; > > + } > > + > > + ret =3D follow_pfn(vma, memmap->vma_base, &pfn); >=20 > This races, don't use follow_pfn() and most definitely don't add new user= s. In > some cases follow_pte, but the pte/pfn is still only valid for as long as= you hold > the pte spinlock. >=20 > > + mmap_read_unlock(current->mm); >=20 > Definitely after here there's zero guarantees about this pfn and it could= point at > anything. >=20 > Please fix, I tried pretty hard to get rid of follow_pfn(), but some of t= hem are > just too hard to fix (e.g. kvm needs a pretty hug rewrite to get it all s= orted). >=20 > Cheers, Daniel >=20 > > + if (ret < 0) { > > + dev_dbg(acrn_dev.this_device, > > + "Failed to lookup PFN at VMA:%pK.\n", (void > *)memmap->vma_base); > > + return ret; > > + } > > + > > + return acrn_mm_region_add(vm, memmap->user_vm_pa, > > + PFN_PHYS(pfn), memmap->len, > > + ACRN_MEM_TYPE_WB, memmap->attr); > > + } > > + mmap_read_unlock(current->mm); > > + > > /* Get the page number of the map region */ > > nr_pages =3D memmap->len >> PAGE_SHIFT; > > pages =3D vzalloc(nr_pages * sizeof(struct page *)); > > > > base-commit: 73878e5eb1bd3c9656685ca60bc3a49d17311e0c > > -- > > 2.25.1 > > >=20 > -- > Daniel Vetter > Software Engineer, Intel Corporation > http://blog.ffwll.ch