From: Sean Christopherson <seanjc@google.com>
To: Joerg Roedel <joro@8bytes.org>
Cc: Maxim Levitsky <mlevitsk@redhat.com>,
kvm@vger.kernel.org, Vitaly Kuznetsov <vkuznets@redhat.com>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Wanpeng Li <wanpengli@tencent.com>,
Kieran Bingham <kbingham@kernel.org>,
Jessica Yu <jeyu@kernel.org>, Jan Kiszka <jan.kiszka@siemens.com>,
Andrew Morton <akpm@linux-foundation.org>,
"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
<x86@kernel.org>, Jim Mattson <jmattson@google.com>,
Borislav Petkov <bp@alien8.de>,
Stefano Garzarella <sgarzare@redhat.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@suse.de>
Subject: Re: [PATCH 3/3] KVM: SVM: allow to intercept all exceptions for debug
Date: Thu, 18 Mar 2021 16:35:24 +0000 [thread overview]
Message-ID: <YFOBTITk7EkGdzR2@google.com> (raw)
In-Reply-To: <YFN2HGG7ZTdamM7k@8bytes.org>
On Thu, Mar 18, 2021, Joerg Roedel wrote:
> On Thu, Mar 18, 2021 at 11:24:25AM +0200, Maxim Levitsky wrote:
> > But again this is a debug feature, and it is intended to allow the user
> > to shoot himself in the foot.
>
> And one can't debug SEV-ES guests with it, so what is the point of
> enabling it for them too?
Agreed. I can see myself enabling debug features by default, it would be nice
to not having to go out of my way to disable them for SEV-ES/SNP guests.
Skipping SEV-ES guests should not be difficult; KVM could probably even
print a message stating that the debug hook is being ignored. One thought would
be to snapshot debug_intercept_exceptions at VM creation, and simply zero it out
for incompatible guests. That would also allow changing debug_intercept_exceptions
without reloading KVM, which IMO would be very convenient.
next prev parent reply other threads:[~2021-03-18 16:36 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-15 22:10 [PATCH 0/3] KVM: my debug patch queue Maxim Levitsky
2021-03-15 22:10 ` [PATCH 1/3] scripts/gdb: rework lx-symbols gdb script Maxim Levitsky
2021-03-16 13:38 ` Jan Kiszka
2021-03-16 14:12 ` Maxim Levitsky
2021-03-15 22:10 ` [PATCH 2/3] KVM: x86: guest debug: don't inject interrupts while single stepping Maxim Levitsky
2021-03-15 23:37 ` Sean Christopherson
2021-03-16 9:16 ` Jan Kiszka
2021-03-16 10:59 ` Maxim Levitsky
2021-03-16 11:27 ` Jan Kiszka
2021-03-16 12:34 ` Maxim Levitsky
2021-03-16 13:46 ` Jan Kiszka
2021-03-16 14:34 ` Maxim Levitsky
2021-03-16 15:31 ` Jan Kiszka
[not found] ` <e2cd978e357155dbab21a523bb8981973bd10da7.camel@redhat.com>
2021-03-16 15:56 ` Jan Kiszka
2021-03-16 16:50 ` Sean Christopherson
2021-03-16 17:01 ` Jan Kiszka
2021-03-16 17:26 ` Sean Christopherson
2021-03-17 9:20 ` Jan Kiszka
2021-03-16 18:02 ` Maxim Levitsky
2021-03-18 16:02 ` Jan Kiszka
2021-03-18 12:21 ` Jan Kiszka
2021-03-16 10:55 ` Maxim Levitsky
2021-03-15 22:10 ` [PATCH 3/3] KVM: SVM: allow to intercept all exceptions for debug Maxim Levitsky
2021-03-16 8:32 ` Joerg Roedel
2021-03-16 10:51 ` Maxim Levitsky
2021-03-18 9:19 ` Joerg Roedel
2021-03-18 9:24 ` Maxim Levitsky
2021-03-18 15:47 ` Joerg Roedel
2021-03-18 16:35 ` Sean Christopherson [this message]
2021-03-18 16:41 ` Maxim Levitsky
2021-03-18 17:22 ` Sean Christopherson
2021-03-16 8:34 ` Borislav Petkov
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