On 8/13/21 12:08 PM, Tom Lendacky wrote:
On 8/12/21 5:07 AM, Kirill A. Shutemov wrote:
On Wed, Aug 11, 2021 at 10:52:55AM -0500, Tom Lendacky wrote:
On 8/11/21 7:19 AM, Kirill A. Shutemov wrote:
On Tue, Aug 10, 2021 at 02:48:54PM -0500, Tom Lendacky wrote:
On 8/10/21 1:45 PM, Kuppuswamy, Sathyanarayanan wrote:
...
Looking at code agains, now I *think* the reason is accessing a global
variable from __startup_64() inside TDX version of prot_guest_has().
__startup_64() is special. If you access any global variable you need to
use fixup_pointer(). See comment before __startup_64().
I'm not sure how you get away with accessing sme_me_mask directly from
there. Any clues? Maybe just a luck and complier generates code just
right
for your case, I donno.
Hmm... yeah, could be that the compiler is using rip-relative addressing
for it because it lives in the .data section?
I guess. It has to be fixed. It may break with complier upgrade or any
random change around the code.
I'll look at doing that separate from this series.
BTW, does it work with clang for you?
I haven't tried with clang, I'll check on that.
Just as an fyi, clang also uses rip relative addressing for those
variables. No issues booting SME and SEV guests built with clang.
Thanks,
Tom
Thanks,
Tom
