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The following commit:d0ec49d4de("kvm/x86/svm: Support Secure Memory Encryption within KVM") uses __sme_clr() to remove the C-bit in rsvd_bits(). rsvd_bits() is just a simple function to return some 1 bits. Applying a mask based on properties of the host MMU is incorrect. Additionally, the masks computed by __reset_rsvds_bits_mask also apply to guest page tables, where the C bit is reserved since we don't emulate SME. The fix is to clear the C-bit from rsvd_bits_mask array after it has been populated from __reset_rsvds_bits_mask() Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Acked-by: Paolo Bonzini <pbonzini@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: kvm@vger.kernel.org Cc: paolo.bonzini@gmail.com Fixes:d0ec49d("kvm/x86/svm: Support Secure Memory Encryption within KVM") Link: http://lkml.kernel.org/r/20170825205540.123531-1-brijesh.singh@amd.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.