s390/kvm/pci.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /*
0003  * s390 kvm PCI passthrough support
0004  *
0005  * Copyright IBM Corp. 2022
0006  *
0007  *    Author(s): Matthew Rosato <mjrosato@linux.ibm.com>
0008  */
0009
0010 #ifndef __KVM_S390_PCI_H
0011 #define __KVM_S390_PCI_H
0012
0013 #include <linux/kvm.h>
0014 #include <linux/kvm_host.h>
0015 #include <linux/mutex.h>
0016 #include <linux/pci.h>
0017 #include <asm/airq.h>
0018 #include <asm/cpu.h>
0019
0020 struct kvm_zdev {
0021     struct zpci_dev *zdev;
0022     struct kvm *kvm;
0023     struct zpci_fib fib;
0024     struct list_head entry;
0025 };
0026
0027 struct zpci_gaite {
0028     u32 gisa;
0029     u8 gisc;
0030     u8 count;
0031     u8 reserved;
0032     u8 aisbo;
0033     u64 aisb;
0034 };
0035
0036 struct zpci_aift {
0037     struct zpci_gaite *gait;
0038     struct airq_iv *sbv;
0039     struct kvm_zdev **kzdev;
0040     spinlock_t gait_lock; /* Protects the gait, used during AEN forward */
0041     struct mutex aift_lock; /* Protects the other structures in aift */
0042 };
0043
0044 extern struct zpci_aift *aift;
0045
0046 static inline struct kvm *kvm_s390_pci_si_to_kvm(struct zpci_aift *aift,
0047                          unsigned long si)
0048 {
0049     if (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM) || !aift->kzdev ||
0050         !aift->kzdev[si])
0051         return NULL;
0052     return aift->kzdev[si]->kvm;
0053 };
0054
0055 int kvm_s390_pci_aen_init(u8 nisc);
0056 void kvm_s390_pci_aen_exit(void);
0057
0058 void kvm_s390_pci_init_list(struct kvm *kvm);
0059 void kvm_s390_pci_clear_list(struct kvm *kvm);
0060
0061 int kvm_s390_pci_zpci_op(struct kvm *kvm, struct kvm_s390_zpci_op *args);
0062
0063 int kvm_s390_pci_init(void);
0064 void kvm_s390_pci_exit(void);
0065
0066 static inline bool kvm_s390_pci_interp_allowed(void)
0067 {
0068     struct cpuid cpu_id;
0069
0070     get_cpu_id(&cpu_id);
0071     switch (cpu_id.machine) {
0072     case 0x2817:
0073     case 0x2818:
0074     case 0x2827:
0075     case 0x2828:
0076     case 0x2964:
0077     case 0x2965:
0078         /* No SHM on certain machines */
0079         return false;
0080     default:
0081         return (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM) &&
0082             sclp.has_zpci_lsi && sclp.has_aeni && sclp.has_aisi &&
0083             sclp.has_aisii);
0084     }
0085 }
0086
0087 #endif /* __KVM_S390_PCI_H */