Re: [PATCH v3 1/8] x86/vmx: handle writes to MISC_ENABLE MSR

[Jan Beulich <jbeulich@xxxxxxxx>]

On 01.09.2020 12:54, Roger Pau Monne wrote:
> Such handling consist in checking that no bits have been changed from
> the read value, if that's the case silently drop the write, otherwise
> inject a fault.
> 
> At least Windows guests will expect to write to the MISC_ENABLE MSR
> with the same value that's been read from it.
> 
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
> Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> ---
>  xen/arch/x86/hvm/vmx/vmx.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)

Btw - early next week I think I'll time out waiting for a VMX side
ack for this change.

Jan