Re: Dont leak debug flugs in ioctl_get_regs()?

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Jun Koi wrote:
> Hi,
>
> In kvm_vcpu_ioctl_get_regs() function (kvm_main.c), we have a comment
> like this: "Dont leak debug flags in case they were set for guest
> debugging".
>
> What is the reasons that make us filter out TF and RF bit in EFLAGS like that?
>   

VT and SVM don't virtualize the debug flags.  So when we debug the 
guest, we modify the guest's TF and RF, not some hardware-provided 
shadow register.  So, when we look at the guest's eflags, we need to 
consider that some of the bits are owned by the host, not the guest.

-- 
error compiling committee.c: too many arguments to function


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