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[PATCH v6 09/19] xen/cpufreq: neglect unsupported-mode request from DOM0
- To: <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Penny Zheng <Penny.Zheng@xxxxxxx>
- Date: Fri, 11 Jul 2025 11:50:56 +0800
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- Cc: <ray.huang@xxxxxxx>, Penny Zheng <Penny.Zheng@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Fri, 11 Jul 2025 03:51:50 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
DOM0 could deliever whatever performance statistic (Px, _CPC) it parses, it is
Xen's responsibility to decide which one it shall accept.
Xen rely on XEN_PROCESSOR_PM_xxx flag to tell which mode ( Px or CPPC )
current cpufreq driver supports, and accepts relative info. It will neglect
unsupported-mode request and yields success.
Signed-off-by: Penny Zheng <Penny.Zheng@xxxxxxx>
---
v5 -> v6:
- new commit
---
xen/arch/x86/platform_hypercall.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/xen/arch/x86/platform_hypercall.c
b/xen/arch/x86/platform_hypercall.c
index 90abd3197f..3eba791889 100644
--- a/xen/arch/x86/platform_hypercall.c
+++ b/xen/arch/x86/platform_hypercall.c
@@ -539,9 +539,14 @@ ret_t do_platform_op(
case XEN_PM_PX:
if ( !(xen_processor_pmbits & XEN_PROCESSOR_PM_PX) )
{
- ret = -ENOSYS;
+ /*
+ * Neglect Px-info when registered cpufreq driver
+ * isn't in Px mode
+ */
+ ret = 0;
break;
}
+
ret = set_px_pminfo(op->u.set_pminfo.id, &op->u.set_pminfo.u.perf);
break;
--
2.34.1
|
