Re: [Xen-devel] [PATCH v2 1/5] x86/boot: Initialise the debug registers correctly

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Mon, Oct 15, 2018 at 11:36:16AM +0100, Andrew Cooper wrote:
> In particular, initialising %dr6 with the value 0 is buggy, because on
> hardware supporting Transnational Memory, it will cause the sticky RTM bit to
> be asserted, even though a debug exception from a transaction hasn't actually
> been observed.
> 
> Move X86_DR6_DEFAULT into x86-defns.h along with the other architectural
> register constants, and introduce a new X86_DR7_DEFAULT.  Use the existing
> write_debugreg() helper, rather than opencoded inline assembly.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>

Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

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