Re: [Xen-devel] [PATCH] vmx/monitor: CPUID events

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 08/07/16 03:31, Tamas K Lengyel wrote:
> This patch implements sending notification to a monitor subscriber when an
> x86/vmx guest executes the CPUID instruction.
>
> Signed-off-by: Tamas K Lengyel <tamas.lengyel@xxxxxxxxxxxx>

Is it wise having an on/off control without any further filtering?  (I
suppose that it is at least a fine first start).

cpuid is usually the serialising instruction used with rdtsc for timing
loops.  This is bad enough in VMs because of the VMExit, but becomes
even worse if there is a monitor delay as well.

~Andrew

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