mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-26 17:25:16 +07:00
20c8ccb197
Based on 1 normalized pattern(s): this work is licensed under the terms of the gnu gpl version 2 see the copying file in the top level directory extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 35 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.797835076@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
128 lines
2.6 KiB
C
128 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/* CPU virtualization extensions handling
|
|
*
|
|
* This should carry the code for handling CPU virtualization extensions
|
|
* that needs to live in the kernel core.
|
|
*
|
|
* Author: Eduardo Habkost <ehabkost@redhat.com>
|
|
*
|
|
* Copyright (C) 2008, Red Hat Inc.
|
|
*
|
|
* Contains code from KVM, Copyright (C) 2006 Qumranet, Inc.
|
|
*/
|
|
#ifndef _ASM_X86_VIRTEX_H
|
|
#define _ASM_X86_VIRTEX_H
|
|
|
|
#include <asm/processor.h>
|
|
|
|
#include <asm/vmx.h>
|
|
#include <asm/svm.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
/*
|
|
* VMX functions:
|
|
*/
|
|
|
|
static inline int cpu_has_vmx(void)
|
|
{
|
|
unsigned long ecx = cpuid_ecx(1);
|
|
return test_bit(5, &ecx); /* CPUID.1:ECX.VMX[bit 5] -> VT */
|
|
}
|
|
|
|
|
|
/** Disable VMX on the current CPU
|
|
*
|
|
* vmxoff causes a undefined-opcode exception if vmxon was not run
|
|
* on the CPU previously. Only call this function if you know VMX
|
|
* is enabled.
|
|
*/
|
|
static inline void cpu_vmxoff(void)
|
|
{
|
|
asm volatile ("vmxoff");
|
|
cr4_clear_bits(X86_CR4_VMXE);
|
|
}
|
|
|
|
static inline int cpu_vmx_enabled(void)
|
|
{
|
|
return __read_cr4() & X86_CR4_VMXE;
|
|
}
|
|
|
|
/** Disable VMX if it is enabled on the current CPU
|
|
*
|
|
* You shouldn't call this if cpu_has_vmx() returns 0.
|
|
*/
|
|
static inline void __cpu_emergency_vmxoff(void)
|
|
{
|
|
if (cpu_vmx_enabled())
|
|
cpu_vmxoff();
|
|
}
|
|
|
|
/** Disable VMX if it is supported and enabled on the current CPU
|
|
*/
|
|
static inline void cpu_emergency_vmxoff(void)
|
|
{
|
|
if (cpu_has_vmx())
|
|
__cpu_emergency_vmxoff();
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
* SVM functions:
|
|
*/
|
|
|
|
/** Check if the CPU has SVM support
|
|
*
|
|
* You can use the 'msg' arg to get a message describing the problem,
|
|
* if the function returns zero. Simply pass NULL if you are not interested
|
|
* on the messages; gcc should take care of not generating code for
|
|
* the messages on this case.
|
|
*/
|
|
static inline int cpu_has_svm(const char **msg)
|
|
{
|
|
if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD &&
|
|
boot_cpu_data.x86_vendor != X86_VENDOR_HYGON) {
|
|
if (msg)
|
|
*msg = "not amd or hygon";
|
|
return 0;
|
|
}
|
|
|
|
if (boot_cpu_data.extended_cpuid_level < SVM_CPUID_FUNC) {
|
|
if (msg)
|
|
*msg = "can't execute cpuid_8000000a";
|
|
return 0;
|
|
}
|
|
|
|
if (!boot_cpu_has(X86_FEATURE_SVM)) {
|
|
if (msg)
|
|
*msg = "svm not available";
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
/** Disable SVM on the current CPU
|
|
*
|
|
* You should call this only if cpu_has_svm() returned true.
|
|
*/
|
|
static inline void cpu_svm_disable(void)
|
|
{
|
|
uint64_t efer;
|
|
|
|
wrmsrl(MSR_VM_HSAVE_PA, 0);
|
|
rdmsrl(MSR_EFER, efer);
|
|
wrmsrl(MSR_EFER, efer & ~EFER_SVME);
|
|
}
|
|
|
|
/** Makes sure SVM is disabled, if it is supported on the CPU
|
|
*/
|
|
static inline void cpu_emergency_svm_disable(void)
|
|
{
|
|
if (cpu_has_svm(NULL))
|
|
cpu_svm_disable();
|
|
}
|
|
|
|
#endif /* _ASM_X86_VIRTEX_H */
|