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x86/sev: Make enc_dec_hypercall() accept a size instead of npages
commit ac3f9c9 upstream. enc_dec_hypercall() accepted a page count instead of a size, which forced its callers to round up. As a result, non-page aligned vaddrs caused pages to be spuriously marked as decrypted via the encryption status hypercall, which in turn caused consistent corruption of pages during live migration. Live migration requires accurate encryption status information to avoid migrating pages from the wrong perspective. Fixes: 064ce6c ("mm: x86: Invoke hypercall when page encryption status is changed") Signed-off-by: Steve Rutherford <srutherford@google.com> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com> Reviewed-by: Pankaj Gupta <pankaj.gupta@amd.com> Tested-by: Ben Hillier <bhillier@google.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20230824223731.2055016-1-srutherford@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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