Re: [Xen-devel] [PATCH] x86/VPMU: Check more carefully which bits are allowed to be written to MSRs

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Boris Ostrovsky [mailto:boris.ostrovsky@xxxxxxxxxx]
> Sent: Wednesday, December 23, 2015 12:25 AM
> 
> Current Intel VPMU emulation needs to perform more checks when writing
> PMU MSRs on guest's behalf:
> * MSR_CORE_PERF_GLOBAL_CTRL is not checked at all
> * MSR_CORE_PERF_FIXED_CTR_CTRL has more reserved bits in PMU version 2
> * MSR_CORE_PERF_GLOBAL_OVF_CTRL's bit 61 is allowed on versions greater
> * than 2.
> 
> We can also use precomputed mask in core2_vpmu_do_interrupt().
> 
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>

Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

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