From: Paolo Bonzini <pbonzini@redhat.com>
To: "Radim Krčmář" <rkrcmar@redhat.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
alex.williamson@redhat.com, mtosatti@redhat.com, gleb@kernel.org,
jan.kiszka@siemens.com
Subject: Re: [PATCH 4/7] KVM: vmx: Allow the guest to run with dirty debug registers
Date: Mon, 10 Mar 2014 13:24:10 +0100 [thread overview]
Message-ID: <531DAEEA.8000909@redhat.com> (raw)
In-Reply-To: <20140310121704.GB16023@potion.brq.redhat.com>
Il 10/03/2014 13:17, Radim Krčmář ha scritto:
>> > I considered this, but decided that it's unlikely for emulation to
>> > be faster than hardware---especially on those AMD CPUs that lack
>> > decode assists (and it's good for VMX and SVM code to look as
>> > similar as possible).
> I meant to move it before the block that exits if there is the
> 'exception on access' bit set in cr7, so we wouldn't exit again right
> away on the actual access, which is quite likely.
> (Exiting without emulation was a great move.)
>
Ah yes, for the GD bit. I don't know, it's quite unlikely that anyone
will use it... It's a feeble attempt at allowing virtualization of the
debug registers without VMX.
Paolo
next prev parent reply other threads:[~2014-03-10 12:24 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-07 11:42 [PATCH 0/7] KVM: x86: Let the guest write to multiple debug registers with one vmexit Paolo Bonzini
2014-03-07 11:42 ` [PATCH 1/7] KVM: vmx: we do rely on loading DR7 on entry Paolo Bonzini
2014-03-07 11:42 ` [PATCH 2/7] KVM: x86: change vcpu->arch.switch_db_regs to a bit mask Paolo Bonzini
2014-03-07 11:42 ` [PATCH 3/7] KVM: x86: Allow the guest to run with dirty debug registers Paolo Bonzini
2014-03-09 18:28 ` Radim Krčmář
2014-03-09 20:07 ` Paolo Bonzini
2014-03-10 12:11 ` Radim Krčmář
2014-03-07 11:42 ` [PATCH 4/7] KVM: vmx: " Paolo Bonzini
2014-03-09 18:26 ` Radim Krčmář
2014-03-09 20:12 ` Paolo Bonzini
2014-03-10 12:17 ` Radim Krčmář
2014-03-10 12:24 ` Paolo Bonzini [this message]
2014-03-07 11:42 ` [PATCH 5/7] KVM: nVMX: Allow nested guests " Paolo Bonzini
2014-03-07 11:42 ` [PATCH 6/7] KVM: svm: set/clear all DR intercepts in one swoop Paolo Bonzini
2014-03-07 11:42 ` [PATCH 7/7] KVM: svm: Allow the guest to run with dirty debug registers Paolo Bonzini
2014-03-09 8:11 ` [PATCH 0/7] KVM: x86: Let the guest write to multiple debug registers with one vmexit Jan Kiszka
2014-03-09 8:15 ` Jan Kiszka
2014-03-09 8:31 ` Paolo Bonzini
2014-03-10 12:23 ` Radim Krčmář
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