linux-kernel - Re: [PATCH 3/3] KVM: SVM: allow to intercept all exceptions for debug

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Date:   Tue, 16 Mar 2021 09:34:57 +0100
From:   Borislav Petkov <bp@...e.de>
To:     Maxim Levitsky <mlevitsk@...hat.com>
Cc:     kvm@...r.kernel.org, Vitaly Kuznetsov <vkuznets@...hat.com>,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Wanpeng Li <wanpengli@...cent.com>,
        Kieran Bingham <kbingham@...nel.org>,
        Jessica Yu <jeyu@...nel.org>,
        Jan Kiszka <jan.kiszka@...mens.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        Joerg Roedel <joro@...tes.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Jim Mattson <jmattson@...gle.com>,
        Borislav Petkov <bp@...en8.de>,
        Stefano Garzarella <sgarzare@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH 3/3] KVM: SVM: allow to intercept all exceptions for debug

On Tue, Mar 16, 2021 at 12:10:20AM +0200, Maxim Levitsky wrote:
> Add a new debug module param 'debug_intercept_exceptions' which will allow the
> KVM to intercept any guest exception, and forward it to the guest.
> 
> This can be very useful for guest debugging and/or KVM debugging with kvm trace.
> This is not intended to be used on production systems.
> 
> This is based on an idea first shown here:
> https://patchwork.kernel.org/project/kvm/patch/20160301192822.GD22677@pd.tnic/
> 
> CC: Borislav Petkov <bp@...e.de>
> Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>

> ---
>  arch/x86/include/asm/kvm_host.h |  2 +
>  arch/x86/kvm/svm/svm.c          | 77 ++++++++++++++++++++++++++++++++-
>  arch/x86/kvm/svm/svm.h          |  5 ++-
>  arch/x86/kvm/x86.c              |  5 ++-
>  4 files changed, 85 insertions(+), 4 deletions(-)

Looks interesting, I'll give it a try when I get a chance in the coming days.

Thx!

-- 
Regards/Gruss,
    Boris.

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