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[PATCH 0/2] x86: Misc enumeration improvements
- To: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 10 Mar 2023 16:02:36 +0000
- Authentication-results: esa6.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none
- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Fri, 10 Mar 2023 16:03:00 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Patch 1 noticed because xen-cpuid currently says:
[13] 0x00000007:2.edx intel-psfd <1> <2> <4> mcdt-no
when dumping the static known-feature bitmap. In some copious free time, we
should have a unit test that catches this.
Patch 2 when double checking that the enumeration hole was in fact correct.
We should offer DDP-CTRL to guests, but I'm not sure when it is appearing in
hardware, and it's not massively urgent - the DDP behaviour is mostly sane
(having been designed in a post-spectre world) and this is a just-in-case
control.
Andrew Cooper (2):
x86/spec-ctrl: Add BHI controls to userspace components
x86/spec-ctrl: Enumerations for DDP controls
tools/libs/light/libxl_cpuid.c | 4 ++++
tools/misc/xen-cpuid.c | 6 +++---
xen/arch/x86/include/asm/msr-index.h | 1 +
xen/include/public/arch-x86/cpufeatureset.h | 1 +
4 files changed, 9 insertions(+), 3 deletions(-)
--
2.30.2
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