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Diffstat (limited to 'drivers/xen/pcpu.c')
-rw-r--r--drivers/xen/pcpu.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/xen/pcpu.c b/drivers/xen/pcpu.c
index b3e3d1bb37f3..508655273145 100644
--- a/drivers/xen/pcpu.c
+++ b/drivers/xen/pcpu.c
@@ -47,6 +47,9 @@
#include <asm/xen/hypervisor.h>
#include <asm/xen/hypercall.h>
+#ifdef CONFIG_ACPI
+#include <acpi/processor.h>
+#endif
/*
* @cpu_id: Xen physical cpu logic number
@@ -400,4 +403,23 @@ bool __init xen_processor_present(uint32_t acpi_id)
return online;
}
+
+void xen_sanitize_proc_cap_bits(uint32_t *cap)
+{
+ struct xen_platform_op op = {
+ .cmd = XENPF_set_processor_pminfo,
+ .u.set_pminfo.id = -1,
+ .u.set_pminfo.type = XEN_PM_PDC,
+ };
+ u32 buf[3] = { ACPI_PDC_REVISION_ID, 1, *cap };
+ int ret;
+
+ set_xen_guest_handle(op.u.set_pminfo.pdc, buf);
+ ret = HYPERVISOR_platform_op(&op);
+ if (ret)
+ pr_err("sanitize of _PDC buffer bits from Xen failed: %d\n",
+ ret);
+ else
+ *cap = buf[2];
+}
#endif