Re: [Xen-devel] [PATCH] x86/vvmx: Fix nested virt on VMCS-Shadow capable hardware

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

> From: Andrew Cooper [mailto:andrew.cooper3@xxxxxxxxxx]
> Sent: Tuesday, July 30, 2019 10:43 PM
> 
> c/s e9986b0dd "x86/vvmx: Simplify per-CPU memory allocations" had the
> wrong
> indirection on its pointer check in nvmx_cpu_up_prepare(), causing the
> VMCS-shadowing buffer never be allocated.  Fix it.
> 
> This in turn results in a massive quantity of logspam, as every virtual
> vmentry/exit hits both gdprintk()s in the *_bulk() functions.
> 
> Switch these to using printk_once().  The size of the buffer is chosen at
> compile time, so complaining about it repeatedly is of no benefit.
> 
> Finally, drop the runtime NULL pointer checks.  It is not terribly appropriate
> to be repeatedly checking infrastructure which is set up from start-of-day,
> and in this case, actually hid the above bug.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

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