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/* SPDX-License-Identifier: GPL-2.0 */
/*
* s390 kvm PCI passthrough support
*
* Copyright IBM Corp. 2022
*
* Author(s): Matthew Rosato <mjrosato@linux.ibm.com>
*/
#ifndef __KVM_S390_PCI_H
#define __KVM_S390_PCI_H
#include <linux/kvm.h>
#include <linux/kvm_host.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <asm/airq.h>
#include <asm/cpu.h>
struct kvm_zdev {
struct zpci_dev *zdev;
struct kvm *kvm;
struct zpci_fib fib;
struct list_head entry;
};
struct zpci_gaite {
u32 gisa;
u8 gisc;
u8 count;
u8 reserved;
u8 aisbo;
u64 aisb;
};
struct zpci_aift {
struct zpci_gaite *gait;
struct airq_iv *sbv;
struct kvm_zdev **kzdev;
spinlock_t gait_lock; /* Protects the gait, used during AEN forward */
struct mutex aift_lock; /* Protects the other structures in aift */
};
extern struct zpci_aift *aift;
static inline struct kvm *kvm_s390_pci_si_to_kvm(struct zpci_aift *aift,
unsigned long si)
{
if (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM) || aift->kzdev == 0 ||
aift->kzdev[si] == 0)
return 0;
return aift->kzdev[si]->kvm;
};
int kvm_s390_pci_aen_init(u8 nisc);
void kvm_s390_pci_aen_exit(void);
void kvm_s390_pci_init_list(struct kvm *kvm);
void kvm_s390_pci_clear_list(struct kvm *kvm);
int kvm_s390_pci_zpci_op(struct kvm *kvm, struct kvm_s390_zpci_op *args);
int kvm_s390_pci_init(void);
void kvm_s390_pci_exit(void);
static inline bool kvm_s390_pci_interp_allowed(void)
{
struct cpuid cpu_id;
get_cpu_id(&cpu_id);
switch (cpu_id.machine) {
case 0x2817:
case 0x2818:
case 0x2827:
case 0x2828:
case 0x2964:
case 0x2965:
/* No SHM on certain machines */
return false;
default:
return (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM) &&
sclp.has_zpci_lsi && sclp.has_aeni && sclp.has_aisi &&
sclp.has_aisii);
}
}
#endif /* __KVM_S390_PCI_H */
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