linux-kernel - Re: [PATCH kernel 0/9 v6] KVM: SEV: Enable AMD SEV-ES DebugSwap

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Date:   Thu, 15 Jun 2023 17:13:22 +1000
From:   Alexey Kardashevskiy <aik@....com>
To:     kvm@...r.kernel.org
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Tom Lendacky <thomas.lendacky@....com>,
        Sean Christopherson <seanjc@...gle.com>
Subject: Re: [PATCH kernel 0/9 v6] KVM: SEV: Enable AMD SEV-ES DebugSwap

Ouch, forgot to mark this as "v6". Sorry...



On 15/6/23 16:37, Alexey Kardashevskiy wrote:
> This is to use another AMD SEV-ES hardware assisted register swap,
> more detail in 6/9. In the process it's been suggested to fix other
> things, here is the attempt, with the great help of amders.
> 
> The previous conversation is here:
> https://lore.kernel.org/r/20230411125718.2297768-1-aik@amd.com
> 
> This is based on sha1
> 6e2e1e779912 Ingo Molnar "Merge branch into tip/master: 'x86/sgx'".
> 
> The tree is here: https://github.com/aik/linux/tree/debugswap
> 
> Please comment. Thanks.
> 
> 
> Alexey Kardashevskiy (6):
>    KVM: SEV: move set_dr_intercepts/clr_dr_intercepts from the header
>    KVM: SEV: Move SEV's GP_VECTOR intercept setup to SEV
>    KVM: SEV-ES: explicitly disable debug
>    KVM: SVM/SEV/SEV-ES: Rework intercepts
>    KVM: SEV: Enable data breakpoints in SEV-ES
>    KVM: SEV-ES: Eliminate #DB intercept when DebugSwap enabled
> 
> Sean Christopherson (3):
>    KVM: SVM: Rewrite sev_es_prepare_switch_to_guest()'s comment about
>      swap types
>    KVM: SVM: Don't defer NMI unblocking until next exit for SEV-ES guests
>    KVM: SVM: Don't try to pointlessly single-step SEV-ES guests for NMI
>      window
> 
>   arch/x86/include/asm/cpufeatures.h       |  1 +
>   arch/x86/include/asm/svm.h               |  1 +
>   arch/x86/kvm/svm/svm.h                   | 42 ----------
>   tools/arch/x86/include/asm/cpufeatures.h |  1 +
>   arch/x86/kvm/svm/sev.c                   | 86 +++++++++++++++++---
>   arch/x86/kvm/svm/svm.c                   | 70 ++++++++++++++--
>   6 files changed, 137 insertions(+), 64 deletions(-)
> 

-- 
Alexey