mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 02:46:49 +07:00
5f43238d03
Currently kvm provides hypercalls only for x86* architectures. To provide hypercall infrastructure for other kvm architectures I split kvm_para.h into a generic header file and architecture specific definitions. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
#ifndef __X86_KVM_PARA_H
|
|
#define __X86_KVM_PARA_H
|
|
|
|
/* This CPUID returns the signature 'KVMKVMKVM' in ebx, ecx, and edx. It
|
|
* should be used to determine that a VM is running under KVM.
|
|
*/
|
|
#define KVM_CPUID_SIGNATURE 0x40000000
|
|
|
|
/* This CPUID returns a feature bitmap in eax. Before enabling a particular
|
|
* paravirtualization, the appropriate feature bit should be checked.
|
|
*/
|
|
#define KVM_CPUID_FEATURES 0x40000001
|
|
|
|
#ifdef __KERNEL__
|
|
#include <asm/processor.h>
|
|
|
|
/* This instruction is vmcall. On non-VT architectures, it will generate a
|
|
* trap that we will then rewrite to the appropriate instruction.
|
|
*/
|
|
#define KVM_HYPERCALL ".byte 0x0f,0x01,0xc1"
|
|
|
|
/* For KVM hypercalls, a three-byte sequence of either the vmrun or the vmmrun
|
|
* instruction. The hypervisor may replace it with something else but only the
|
|
* instructions are guaranteed to be supported.
|
|
*
|
|
* Up to four arguments may be passed in rbx, rcx, rdx, and rsi respectively.
|
|
* The hypercall number should be placed in rax and the return value will be
|
|
* placed in rax. No other registers will be clobbered unless explicited
|
|
* noted by the particular hypercall.
|
|
*/
|
|
|
|
static inline long kvm_hypercall0(unsigned int nr)
|
|
{
|
|
long ret;
|
|
asm volatile(KVM_HYPERCALL
|
|
: "=a"(ret)
|
|
: "a"(nr));
|
|
return ret;
|
|
}
|
|
|
|
static inline long kvm_hypercall1(unsigned int nr, unsigned long p1)
|
|
{
|
|
long ret;
|
|
asm volatile(KVM_HYPERCALL
|
|
: "=a"(ret)
|
|
: "a"(nr), "b"(p1));
|
|
return ret;
|
|
}
|
|
|
|
static inline long kvm_hypercall2(unsigned int nr, unsigned long p1,
|
|
unsigned long p2)
|
|
{
|
|
long ret;
|
|
asm volatile(KVM_HYPERCALL
|
|
: "=a"(ret)
|
|
: "a"(nr), "b"(p1), "c"(p2));
|
|
return ret;
|
|
}
|
|
|
|
static inline long kvm_hypercall3(unsigned int nr, unsigned long p1,
|
|
unsigned long p2, unsigned long p3)
|
|
{
|
|
long ret;
|
|
asm volatile(KVM_HYPERCALL
|
|
: "=a"(ret)
|
|
: "a"(nr), "b"(p1), "c"(p2), "d"(p3));
|
|
return ret;
|
|
}
|
|
|
|
static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
|
|
unsigned long p2, unsigned long p3,
|
|
unsigned long p4)
|
|
{
|
|
long ret;
|
|
asm volatile(KVM_HYPERCALL
|
|
: "=a"(ret)
|
|
: "a"(nr), "b"(p1), "c"(p2), "d"(p3), "S"(p4));
|
|
return ret;
|
|
}
|
|
|
|
static inline int kvm_para_available(void)
|
|
{
|
|
unsigned int eax, ebx, ecx, edx;
|
|
char signature[13];
|
|
|
|
cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
|
|
memcpy(signature + 0, &ebx, 4);
|
|
memcpy(signature + 4, &ecx, 4);
|
|
memcpy(signature + 8, &edx, 4);
|
|
signature[12] = 0;
|
|
|
|
if (strcmp(signature, "KVMKVMKVM") == 0)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline unsigned int kvm_arch_para_features(void)
|
|
{
|
|
return cpuid_eax(KVM_CPUID_FEATURES);
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif
|