linux-kernel - [PATCH] kvm: Dump guest rIP when the guest tried something unsupported

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Date:	Fri, 20 Nov 2015 19:52:12 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	KVM <kvm@...r.kernel.org>
Cc:	Paolo Bonzini <pbonzini@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] kvm: Dump guest rIP when the guest tried something unsupported

From: Borislav Petkov <bp@...e.de>

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 <bp@...e.de>
---
 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__)
-- 
2.3.5

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