diff options
Diffstat (limited to 'arch/s390/kvm/pci.h')
-rw-r--r-- | arch/s390/kvm/pci.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/arch/s390/kvm/pci.h b/arch/s390/kvm/pci.h new file mode 100644 index 000000000000..3a3606c3a0fe --- /dev/null +++ b/arch/s390/kvm/pci.h @@ -0,0 +1,87 @@ +/* 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 */ |