x86/xen: don't write ptes directly in 32-bit PV guests

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In some cases 32-bit PAE PV guests still write PTEs directly instead of
using hypercalls. This is especially bad when clearing a PTE as this is
done via 32-bit writes which will produce intermediate L1TF attackable
PTEs.

Change the code to use hypercalls instead.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

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Juergen Gross 2018-08-21 17:37:54 +02:00 • committed by Boris Ostrovsky

parent 75f2d3a0ce

commit f7c90c2aa4

1 changed files with 3 additions and 4 deletions

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arch/x86/xen/mmu_pv.c

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