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authorFilippo Sironi <sironi@amazon.de>2019-01-31 21:24:33 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2019-04-30 21:32:45 +0200
commitbd53cb35a3e9adb73a834a36586e9ad80e877767 (patch)
tree851b21fe7617e39fa130ac9944da1c3a64378d90 /virt
parent3d5f6beb74a00bcc308612ee007e3e0c6126c397 (diff)
downloadlinux-bd53cb35a3e9adb73a834a36586e9ad80e877767.tar.bz2
X86/KVM: Handle PFNs outside of kernel reach when touching GPTEs
cmpxchg_gpte() calls get_user_pages_fast() to retrieve the number of pages and the respective struct page to map in the kernel virtual address space. This doesn't work if get_user_pages_fast() is invoked with a userspace virtual address that's backed by PFNs outside of kernel reach (e.g., when limiting the kernel memory with mem= in the command line and using /dev/mem to map memory). If get_user_pages_fast() fails, look up the VMA that back the userspace virtual address, compute the PFN and the physical address, and map it in the kernel virtual address space with memremap(). Signed-off-by: Filippo Sironi <sironi@amazon.de> Signed-off-by: KarimAllah Ahmed <karahmed@amazon.de> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
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