From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paolo Bonzini Subject: Re: [PATCH] kvm: Dump guest rIP when the guest tried something unsupported Date: Fri, 4 Dec 2015 15:42:49 +0100 Message-ID: <5661A669.8020901@redhat.com> References: <1448045532-12281-1-git-send-email-bp@alien8.de> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Cc: LKML To: Borislav Petkov , KVM Return-path: In-Reply-To: <1448045532-12281-1-git-send-email-bp@alien8.de> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org On 20/11/2015 19:52, Borislav Petkov wrote: > From: Borislav Petkov > > It looks like this in action: > > kvm [5197]: vcpu0, guest rIP: 0xffffffff810187ba unhandled rdmsr: 0xc001102 > > and helps to pinpoint quickly where in the guest we did the unsupported > thing. > > Signed-off-by: Borislav Petkov > --- > include/linux/kvm_host.h | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h > index 5706a2108f0a..597f6607c440 100644 > --- a/include/linux/kvm_host.h > +++ b/include/linux/kvm_host.h > @@ -439,7 +439,8 @@ struct kvm { > > /* The guest did something we don't support. */ > #define vcpu_unimpl(vcpu, fmt, ...) \ > - kvm_pr_unimpl("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__) > + kvm_pr_unimpl("vcpu%i, guest rIP: 0x%lx " fmt, \ > + (vcpu)->vcpu_id, kvm_rip_read(vcpu), ## __VA_ARGS__) > > #define vcpu_debug(vcpu, fmt, ...) \ > kvm_debug("vcpu%i " fmt, (vcpu)->vcpu_id, ## __VA_ARGS__) > Thanks, applying this to kvm/queue. Paolo