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From: Paolo Bonzini <pbonzini@redhat.com>
To: Marc Zyngier <maz@kernel.org>,
	Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
	James Morse <james.morse@arm.com>,
	Julien Thierry <julien.thierry.kdev@gmail.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	linux-arm-kernel@lists.infradead.org,
	Huacai Chen <chenhc@lemote.com>,
	Aleksandar Markovic <aleksandar.qemu.devel@gmail.com>,
	linux-mips@vger.kernel.org, Paul Mackerras <paulus@ozlabs.org>,
	kvm-ppc@vger.kernel.org,
	Christian Borntraeger <borntraeger@de.ibm.com>,
	Janosch Frank <frankja@linux.ibm.com>,
	David Hildenbrand <david@redhat.com>,
	Cornelia Huck <cohuck@redhat.com>,
	Claudio Imbrenda <imbrenda@linux.ibm.com>
Subject: Re: [RFC PATCH 0/3] KVM: Introduce "VM bugged" concept
Date: Fri, 25 Sep 2020 23:05:48 +0200	[thread overview]
Message-ID: <100a603f-193c-5a46-d428-cfc0ce0a8fe4@redhat.com> (raw)
In-Reply-To: <874knlrf4a.wl-maz@kernel.org>

On 25/09/20 18:32, Marc Zyngier wrote:
> I'm quite like the idea. However, I wonder whether preventing the
> vcpus from re-entering the guest is enough. When something goes really
> wrong, is it safe to allow the userspace process to terminate normally
> and free the associated memory? And is it still safe to allow new VMs
> to be started?

For something that bad, where e.g. you can't rule out future memory
corruptions via use-after-free bugs or similar, you're probably entering
BUG_ON territory.

Paolo


  parent reply	other threads:[~2020-09-25 21:05 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-23 22:45 [RFC PATCH 0/3] KVM: Introduce "VM bugged" concept Sean Christopherson
2020-09-23 22:45 ` [RFC PATCH 1/3] KVM: Export kvm_make_all_cpus_request() for use in marking VMs as bugged Sean Christopherson
2020-09-23 22:45 ` [RFC PATCH 2/3] KVM: Add infrastructure and macro to mark VM " Sean Christopherson
2020-09-23 22:45 ` [RFC PATCH 3/3] KVM: x86: Use KVM_BUG/KVM_BUG_ON to handle bugs that are fatal to the VM Sean Christopherson
2020-09-24 12:34   ` Vitaly Kuznetsov
     [not found]     ` <20200924181134.GB9649@linux.intel.com>
2020-09-25  9:50       ` Vitaly Kuznetsov
2020-09-25 17:12         ` Sean Christopherson
2020-09-25 21:06           ` Paolo Bonzini
2020-09-29  3:52             ` Sean Christopherson
2020-09-29  9:15               ` Paolo Bonzini
2020-09-24  6:37 ` [RFC PATCH 0/3] KVM: Introduce "VM bugged" concept Christian Borntraeger
2020-09-25 16:32 ` Marc Zyngier
2020-09-25 17:00   ` Sean Christopherson
2020-09-25 21:05   ` Paolo Bonzini [this message]
2020-09-29  9:27 ` Cornelia Huck

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