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Re: [PATCH v2 3/3] x86/svmdebug: Print sev and sev_es vmcb bits
- To: Vaishali Thakkar <vaishali.thakkar@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 13 Mar 2024 14:56:15 +0100
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- Cc: andrew.cooper3@xxxxxxxxxx, roger.pau@xxxxxxxxxx, wl@xxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 13 Mar 2024 13:56:21 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 13.03.2024 14:54, Vaishali Thakkar wrote:
> On 3/12/24 09:05, Jan Beulich wrote:
>> On 11.03.2024 13:40, Vaishali Thakkar wrote:
>>> While sev and sev_es bits are not yet enabled in xen,
>>> including their status in the VMCB dump could be
>>> informational.Therefore, print it via svmdebug.
>>
>> Yet there are more bits there. I'm okay with leaving off printing of
>> them here, but it wants clarifying why some are printed and some are
>> not.
>
> Well, the idea is to print the bits that are either enabled or has WIP
> to enable them. (e.g. sev and sev_es) I didn't include other bits as
> I'm not sure if there is any WIP to enable them. Particularly including
> sev and sev_es is useful for us while working on the enablement of it.
>
> Does a commit log like the following makes it clear for you?
>
> " Currently only raw _np_ctrl is being printed. It can
> be informational to know about which particular bits
> are enabled. So, this commit adds the bit-by-bit decode
> for np, sev and sev_es bits.
>
> Note that while only np is enabled in certain scenarios
> at the moment, work for enabling sev and sev_es is in
> progress. And it's useful to have this information as
> part of svmdebug. "
I think that's sufficient, yes.
Jan
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