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x86/sev-es: Do not unroll string I/O for SEV-ES guests
Under the GHCB specification, SEV-ES guests can support string I/O. The current #VC handler contains this support, so remove the need to unroll kernel string I/O operations. This will reduce the number of #VC exceptions generated as well as the number VM exits for the guest. Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/3de04b5b638546ac75d42ba52307fe1a922173d3.1612203987.git.thomas.lendacky@amd.com
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1 changed files with 3 additions and 2 deletions
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@ -474,9 +474,10 @@ void __init mem_encrypt_init(void)
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swiotlb_update_mem_attributes();
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/*
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* With SEV, we need to unroll the rep string I/O instructions.
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* With SEV, we need to unroll the rep string I/O instructions,
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* but SEV-ES supports them through the #VC handler.
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*/
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if (sev_active())
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if (sev_active() && !sev_es_active())
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static_branch_enable(&sev_enable_key);
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print_mem_encrypt_feature_info();
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