From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 65561] KVM:Entry failed on Single stepping sti instruction
Date: Sat, 24 May 2014 05:56:12 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=65561
--- Comment #24 from Jatin Kumar ---
> linux:~/code/cvedr # ./accessmsr
> Segmentation fault
You got a seg fault because it is privileged instruction and I run it in kernel
mode not user mode. But you are likely to be running your program in user mode.
Try something like out instruction.
> Even though my c program in the guest os got a segmentation fault, from the
> host os level, I don't see the printk statement is triggered, so this is not
> about privileged instructions or unprivileged instructions. I think there
> must be some other conditions to trigger these printk statements.
After getting the VM_EXIT it must be first checking if it requires to emulate
or should generate a fault. In this case it would have generated the fault
without emulating it.
Again, you can try it with 'out' instruction.
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