Re: [RFC PATCH 21/35] KVM: SVM: Add support for EFER write traps for an SEV-ES guest

2020-09-15 Thread Tom Lendacky
On 9/14/20 5:08 PM, Sean Christopherson wrote: > On Mon, Sep 14, 2020 at 03:15:35PM -0500, Tom Lendacky wrote: >> From: Tom Lendacky >> >> For SEV-ES guests, the interception of EFER write access is not >> recommended. EFER interception occurs prior to EFER being modified and >> the hypervisor is

[RFC PATCH 21/35] KVM: SVM: Add support for EFER write traps for an SEV-ES guest

2020-09-14 Thread Tom Lendacky
From: Tom Lendacky For SEV-ES guests, the interception of EFER write access is not recommended. EFER interception occurs prior to EFER being modified and the hypervisor is unable to modify EFER itself because the register is located in the encrypted register state. SEV-ES guests introduce a new