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1b09c13c90
Move all the code required to run s390 KVM guests on s390 to a s390 subdirectory. Move gmap related code into a gmap directory to later share gmap code between KVM implementations. Update S390 VFIO-PCI MAINTAINERS filepath. No functional change. Signed-off-by: Steffen Eiden <seiden@linux.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@linux.ibm.com> Signed-off-by: Christian Borntraeger <borntraeger@linux.ibm.com>
93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* KVM guest fault handling.
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*
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* Copyright IBM Corp. 2025
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* Author(s): Claudio Imbrenda <imbrenda@linux.ibm.com>
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*/
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#ifndef ARCH_KVM_GMAP_FAULTIN_H
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#define ARCH_KVM_GMAP_FAULTIN_H
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#include <linux/kvm_host.h>
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#include "dat.h"
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int kvm_s390_faultin_gfn(struct kvm_vcpu *vcpu, struct kvm *kvm, struct guest_fault *f);
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int kvm_s390_get_guest_page(struct kvm *kvm, struct guest_fault *f, gfn_t gfn, bool w);
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static inline int kvm_s390_faultin_gfn_simple(struct kvm_vcpu *vcpu, struct kvm *kvm,
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gfn_t gfn, bool wr)
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{
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struct guest_fault f = { .gfn = gfn, .write_attempt = wr, };
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return kvm_s390_faultin_gfn(vcpu, kvm, &f);
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}
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static inline int kvm_s390_get_guest_page_and_read_gpa(struct kvm *kvm, struct guest_fault *f,
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gpa_t gaddr, unsigned long *val)
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{
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int rc;
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rc = kvm_s390_get_guest_page(kvm, f, gpa_to_gfn(gaddr), false);
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if (rc)
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return rc;
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*val = *(unsigned long *)phys_to_virt(pfn_to_phys(f->pfn) | offset_in_page(gaddr));
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return 0;
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}
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static inline void kvm_s390_release_multiple(struct kvm *kvm, struct guest_fault *guest_faults,
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int n, bool ignore)
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{
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int i;
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for (i = 0; i < n; i++) {
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kvm_release_faultin_page(kvm, guest_faults[i].page, ignore,
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guest_faults[i].write_attempt);
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guest_faults[i].page = NULL;
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}
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}
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static inline bool kvm_s390_multiple_faults_need_retry(struct kvm *kvm, unsigned long seq,
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struct guest_fault *guest_faults, int n,
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bool unsafe)
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{
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int i;
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for (i = 0; i < n; i++) {
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if (!guest_faults[i].valid)
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continue;
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if (unsafe && mmu_invalidate_retry_gfn_unsafe(kvm, seq, guest_faults[i].gfn))
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return true;
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if (!unsafe && mmu_invalidate_retry_gfn(kvm, seq, guest_faults[i].gfn))
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return true;
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}
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return false;
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}
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static inline int kvm_s390_get_guest_pages(struct kvm *kvm, struct guest_fault *guest_faults,
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gfn_t start, int n_pages, bool write_attempt)
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{
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int i, rc;
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for (i = 0; i < n_pages; i++) {
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rc = kvm_s390_get_guest_page(kvm, guest_faults + i, start + i, write_attempt);
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if (rc)
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break;
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}
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return rc;
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}
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#define kvm_s390_release_faultin_array(kvm, array, ignore) \
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kvm_s390_release_multiple(kvm, array, ARRAY_SIZE(array), ignore)
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#define kvm_s390_array_needs_retry_unsafe(kvm, seq, array) \
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kvm_s390_multiple_faults_need_retry(kvm, seq, array, ARRAY_SIZE(array), true)
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#define kvm_s390_array_needs_retry_safe(kvm, seq, array) \
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kvm_s390_multiple_faults_need_retry(kvm, seq, array, ARRAY_SIZE(array), false)
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#endif /* ARCH_KVM_GMAP_FAULTIN_H */
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