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Re: [Xen-devel] [PATCH v2 1/5] x86/boot: Initialise the debug registers correctly
- To: Juergen Gross <jgross@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 15 Oct 2018 13:11:06 +0100
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- Cc: Wei Liu <wei.liu2@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>
- Delivery-date: Mon, 15 Oct 2018 12:22:31 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 15/10/18 12:44, Juergen Gross wrote:
> On 15/10/2018 13:28, Roger Pau Monné wrote:
>> 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>
> What about:
>
> s/Transnational/Transactional/
>
> Or did you mean international? (SCNR)
I did mean Transactional (but could have sworn that I already fixed this
specific mistake. Obviously not).
~Andrew
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