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Do not unroll string I/O for SEV-ES guests because they support it.

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Merge tag 'x86_seves_for_v5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 SEV-ES fix from Borislav Petkov:
 "Do not unroll string I/O for SEV-ES guests because they support it"

* tag 'x86_seves_for_v5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/sev-es: Do not unroll string I/O for SEV-ES guests
This commit is contained in:
Linus Torvalds 2021-02-20 19:16:02 -08:00
commit b9cdab6820
1 changed files with 3 additions and 2 deletions
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5
arch/x86/mm/mem_encrypt.c
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@ -475,9 +475,10 @@ void __init mem_encrypt_init(void)
swiotlb_update_mem_attributes();
/*
* With SEV, we need to unroll the rep string I/O instructions.
* With SEV, we need to unroll the rep string I/O instructions,
* but SEV-ES supports them through the #VC handler.
*/
if (sev_active())
if (sev_active() && !sev_es_active())
static_branch_enable(&sev_enable_key);
print_mem_encrypt_feature_info();