6.12-stable review patch. If anyone has any objections, please let me know.
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From: Roger Pau Monne roger.pau@citrix.com
[ Upstream commit 64a66e2c3b3113dc78a6124e14825d68ddc2e188 ]
When running as a PVH dom0 the ACPI tables exposed to Linux are (mostly) the native ones, thus exposing the C and P states, that can lead to attachment of CPU idle and frequency drivers. However the entity in control of the CPU C and P states is Xen, as dom0 doesn't have a full view of the system load, neither has all CPUs assigned and identity pinned.
Like it's done for classic PV guests, prevent Linux from using idle or frequency state drivers when running as a PVH dom0.
On an AMD EPYC 7543P system without this fix a Linux PVH dom0 will keep the host CPUs spinning at 100% even when dom0 is completely idle, as it's attempting to use the acpi_idle driver.
Signed-off-by: Roger Pau Monné roger.pau@citrix.com Reviewed-by: Jason Andryuk jason.andryuk@amd.com Signed-off-by: Juergen Gross jgross@suse.com Message-ID: 20250407101842.67228-1-roger.pau@citrix.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/x86/xen/enlighten_pvh.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-)
diff --git a/arch/x86/xen/enlighten_pvh.c b/arch/x86/xen/enlighten_pvh.c index 0e3d930bcb89e..9d25d9373945c 100644 --- a/arch/x86/xen/enlighten_pvh.c +++ b/arch/x86/xen/enlighten_pvh.c @@ -1,5 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 #include <linux/acpi.h> +#include <linux/cpufreq.h> +#include <linux/cpuidle.h> #include <linux/export.h> #include <linux/mm.h>
@@ -123,8 +125,23 @@ static void __init pvh_arch_setup(void) { pvh_reserve_extra_memory();
- if (xen_initial_domain()) + if (xen_initial_domain()) { xen_add_preferred_consoles(); + + /* + * Disable usage of CPU idle and frequency drivers: when + * running as hardware domain the exposed native ACPI tables + * causes idle and/or frequency drivers to attach and + * malfunction. It's Xen the entity that controls the idle and + * frequency states. + * + * For unprivileged domains the exposed ACPI tables are + * fabricated and don't contain such data. + */ + disable_cpuidle(); + disable_cpufreq(); + WARN_ON(xen_set_default_idle()); + } }
void __init xen_pvh_init(struct boot_params *boot_params)