[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

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>

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.