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e8c924a4fb
Fix some sparse warnings that a plain integer 0 is being used instead of NULL. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com> Link: https://lore.kernel.org/r/20220915175514.167899-1-mjrosato@linux.ibm.com Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
88 lines
1.8 KiB
C
88 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* s390 kvm PCI passthrough support
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*
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* Copyright IBM Corp. 2022
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*
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* Author(s): Matthew Rosato <mjrosato@linux.ibm.com>
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*/
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#ifndef __KVM_S390_PCI_H
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#define __KVM_S390_PCI_H
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#include <linux/kvm.h>
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#include <linux/kvm_host.h>
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#include <linux/mutex.h>
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#include <linux/pci.h>
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#include <asm/airq.h>
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#include <asm/cpu.h>
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struct kvm_zdev {
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struct zpci_dev *zdev;
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struct kvm *kvm;
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struct zpci_fib fib;
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struct list_head entry;
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};
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struct zpci_gaite {
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u32 gisa;
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u8 gisc;
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u8 count;
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u8 reserved;
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u8 aisbo;
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u64 aisb;
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};
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struct zpci_aift {
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struct zpci_gaite *gait;
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struct airq_iv *sbv;
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struct kvm_zdev **kzdev;
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spinlock_t gait_lock; /* Protects the gait, used during AEN forward */
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struct mutex aift_lock; /* Protects the other structures in aift */
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};
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extern struct zpci_aift *aift;
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static inline struct kvm *kvm_s390_pci_si_to_kvm(struct zpci_aift *aift,
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unsigned long si)
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{
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if (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM) || !aift->kzdev ||
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!aift->kzdev[si])
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return NULL;
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return aift->kzdev[si]->kvm;
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};
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int kvm_s390_pci_aen_init(u8 nisc);
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void kvm_s390_pci_aen_exit(void);
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void kvm_s390_pci_init_list(struct kvm *kvm);
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void kvm_s390_pci_clear_list(struct kvm *kvm);
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int kvm_s390_pci_zpci_op(struct kvm *kvm, struct kvm_s390_zpci_op *args);
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int kvm_s390_pci_init(void);
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void kvm_s390_pci_exit(void);
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static inline bool kvm_s390_pci_interp_allowed(void)
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{
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struct cpuid cpu_id;
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get_cpu_id(&cpu_id);
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switch (cpu_id.machine) {
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case 0x2817:
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case 0x2818:
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case 0x2827:
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case 0x2828:
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case 0x2964:
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case 0x2965:
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/* No SHM on certain machines */
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return false;
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default:
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return (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM) &&
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sclp.has_zpci_lsi && sclp.has_aeni && sclp.has_aisi &&
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sclp.has_aisii);
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}
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}
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#endif /* __KVM_S390_PCI_H */
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