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Commit b930fe5e authored by Konrad Rzeszutek Wilk's avatar Konrad Rzeszutek Wilk
Browse files

xen/acpi: Workaround broken BIOSes exporting non-existing C-states. 



We did a similar check for the P-states but did not do it for
the C-states. What we want to do is ignore cases where the DSDT
has definition for sixteen CPUs, but the machine only has eight
CPUs and we get:
xen-acpi-processor: (CX): Hypervisor error (-22) for ACPI CPU14

Reported-by: default avatarTobias Geiger <tobias.geiger@vido.info>
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent cf405ae6

drivers/xen/xen-acpi-processor.c

+4 −1
Original line number Original line Diff line number Diff line
@@ -128,7 +128,10 @@ static int push_cxx_to_hypervisor(struct acpi_processor *_pr) 
			pr_debug("     C%d: %s %d uS\n",

			pr_debug("     C%d: %s %d uS\n",

				 cx->type, cx->desc, (u32)cx->latency);

				 cx->type, cx->desc, (u32)cx->latency);

		}

		}

	} else

	} else if (ret != -EINVAL)

		/* EINVAL means the ACPI ID is incorrect - meaning the ACPI

		 * table is referencing a non-existing CPU - which can happen

		 * with broken ACPI tables. */

		pr_err(DRV_NAME "(CX): Hypervisor error (%d) for ACPI CPU%u\n",

		pr_err(DRV_NAME "(CX): Hypervisor error (%d) for ACPI CPU%u\n",

		       ret, _pr->acpi_id);

		       ret, _pr->acpi_id);