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Commit 1d5379d0 authored by Michael Sterritt's avatar Michael Sterritt Committed by Borislav Petkov
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x86/sev: Fix SEV-ES INS/OUTS instructions for word, dword, and qword



Properly type the operands being passed to __put_user()/__get_user().
Otherwise, these routines truncate data for dependent instructions
(e.g., INSW) and only read/write one byte.

This has been tested by sending a string with REP OUTSW to a port and
then reading it back in with REP INSW on the same port.

Previous behavior was to only send and receive the first char of the
size. For example, word operations for "abcd" would only read/write
"ac". With change, the full string is now written and read back.

Fixes: f980f9c3 (x86/sev-es: Compile early handler code into kernel image)
Signed-off-by: default avatarMichael Sterritt <sterritt@google.com>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Reviewed-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Reviewed-by: default avatarMarc Orr <marcorr@google.com>
Reviewed-by: default avatarPeter Gonda <pgonda@google.com>
Reviewed-by: default avatarJoerg Roedel <jroedel@suse.de>
Link: https://lkml.kernel.org/r/20211119232757.176201-1-sterritt@google.com
parent 51523ed1
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