x86/sev: Make enc_dec_hypercall() accept a size instead of npages

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commit ac3f9c9f1b 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: 064ce6c550 ("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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Steve Rutherford 2023-08-24 15:37:31 -07:00 • committed by Greg Kroah-Hartman

parent f8a7f10a1d

commit ba50e7773a

3 changed files with 10 additions and 13 deletions

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6

arch/x86/include/asm/mem_encrypt.h

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4

arch/x86/kernel/kvm.c

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13

arch/x86/mm/mem_encrypt_amd.c

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