bfa993b355
The Processor capability bits notify ACPI of the OS capabilities, and
so ACPI can adjust the return of other Processor methods taking the OS
capabilities into account.
When Linux is running as a Xen dom0, the hypervisor is the entity
in charge of processor power management, and hence Xen needs to make
sure the capabilities reported by _OSC/_PDC match the capabilities of
the driver in Xen.
Introduce a small helper to sanitize the buffer when running as Xen
dom0.
When Xen supports HWP, this serves as the equivalent of commit
a21211672c ("ACPI / processor: Request native thermal interrupt
handling via _OSC") to avoid SMM crashes. Xen will set bit
ACPI_PROC_CAP_COLLAB_PROC_PERF (bit 12) in the capability bits and the
_OSC/_PDC call will apply it.
[ jandryuk: Mention Xen HWP's need. Support _OSC & _PDC ]
Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Cc: stable@vger.kernel.org
Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
Reviewed-by: Michal Wilczynski <michal.wilczynski@intel.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Link: https://lore.kernel.org/r/20231108212517.72279-1-jandryuk@gmail.com
Signed-off-by: Juergen Gross <jgross@suse.com>
112 lines
3.3 KiB
C
112 lines
3.3 KiB
C
/******************************************************************************
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* hypervisor.h
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*
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* Linux-specific hypervisor handling.
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*
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* Copyright (c) 2002-2004, K A Fraser
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef _ASM_X86_XEN_HYPERVISOR_H
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#define _ASM_X86_XEN_HYPERVISOR_H
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extern struct shared_info *HYPERVISOR_shared_info;
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extern struct start_info *xen_start_info;
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#include <asm/bug.h>
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#include <asm/processor.h>
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#define XEN_SIGNATURE "XenVMMXenVMM"
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static inline uint32_t xen_cpuid_base(void)
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{
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return hypervisor_cpuid_base(XEN_SIGNATURE, 2);
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}
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struct pci_dev;
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#ifdef CONFIG_XEN_PV_DOM0
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bool xen_initdom_restore_msi(struct pci_dev *dev);
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#else
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static inline bool xen_initdom_restore_msi(struct pci_dev *dev) { return true; }
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#endif
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#ifdef CONFIG_HOTPLUG_CPU
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void xen_arch_register_cpu(int num);
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void xen_arch_unregister_cpu(int num);
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#endif
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#ifdef CONFIG_PVH
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void __init xen_pvh_init(struct boot_params *boot_params);
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void __init mem_map_via_hcall(struct boot_params *boot_params_p);
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#endif
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/* Lazy mode for batching updates / context switch */
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enum xen_lazy_mode {
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XEN_LAZY_NONE,
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XEN_LAZY_MMU,
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XEN_LAZY_CPU,
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};
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DECLARE_PER_CPU(enum xen_lazy_mode, xen_lazy_mode);
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DECLARE_PER_CPU(unsigned int, xen_lazy_nesting);
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static inline void enter_lazy(enum xen_lazy_mode mode)
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{
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enum xen_lazy_mode old_mode = this_cpu_read(xen_lazy_mode);
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if (mode == old_mode) {
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this_cpu_inc(xen_lazy_nesting);
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return;
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}
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BUG_ON(old_mode != XEN_LAZY_NONE);
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this_cpu_write(xen_lazy_mode, mode);
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}
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static inline void leave_lazy(enum xen_lazy_mode mode)
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{
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BUG_ON(this_cpu_read(xen_lazy_mode) != mode);
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if (this_cpu_read(xen_lazy_nesting) == 0)
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this_cpu_write(xen_lazy_mode, XEN_LAZY_NONE);
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else
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this_cpu_dec(xen_lazy_nesting);
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}
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enum xen_lazy_mode xen_get_lazy_mode(void);
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#if defined(CONFIG_XEN_DOM0) && defined(CONFIG_ACPI)
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void xen_sanitize_proc_cap_bits(uint32_t *buf);
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#else
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static inline void xen_sanitize_proc_cap_bits(uint32_t *buf)
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{
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BUG();
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}
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#endif
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#endif /* _ASM_X86_XEN_HYPERVISOR_H */
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