Re: [PATCH] x86/sev-es: Do not unroll string I/O for SEV-ES guests

2021-02-01 Thread Tom Lendacky
On 2/1/21 12:26 PM, Tom Lendacky wrote: From: Tom Lendacky 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

[PATCH] x86/sev-es: Do not unroll string I/O for SEV-ES guests

2021-02-01 Thread Tom Lendacky
From: Tom Lendacky 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 VMEXITS for the guest.