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/* SPDX-License-Identifier: GPL-2.0 */
/*
* KVM guest fault handling.
*
* Copyright IBM Corp. 2025
* Author(s): Claudio Imbrenda <imbrenda@linux.ibm.com>
*/
#ifndef __KVM_S390_FAULTIN_H
#define __KVM_S390_FAULTIN_H
#include <linux/kvm_host.h>
#include "dat.h"
int kvm_s390_faultin_gfn(struct kvm_vcpu *vcpu, struct kvm *kvm, struct guest_fault *f);
int kvm_s390_get_guest_page(struct kvm *kvm, struct guest_fault *f, gfn_t gfn, bool w);
static inline int kvm_s390_faultin_gfn_simple(struct kvm_vcpu *vcpu, struct kvm *kvm,
gfn_t gfn, bool wr)
{
struct guest_fault f = { .gfn = gfn, .write_attempt = wr, };
return kvm_s390_faultin_gfn(vcpu, kvm, &f);
}
static inline int kvm_s390_get_guest_page_and_read_gpa(struct kvm *kvm, struct guest_fault *f,
gpa_t gaddr, unsigned long *val)
{
int rc;
rc = kvm_s390_get_guest_page(kvm, f, gpa_to_gfn(gaddr), false);
if (rc)
return rc;
*val = *(unsigned long *)phys_to_virt(pfn_to_phys(f->pfn) | offset_in_page(gaddr));
return 0;
}
static inline void kvm_s390_release_multiple(struct kvm *kvm, struct guest_fault *guest_faults,
int n, bool ignore)
{
int i;
for (i = 0; i < n; i++) {
kvm_release_faultin_page(kvm, guest_faults[i].page, ignore,
guest_faults[i].write_attempt);
guest_faults[i].page = NULL;
}
}
static inline bool kvm_s390_multiple_faults_need_retry(struct kvm *kvm, unsigned long seq,
struct guest_fault *guest_faults, int n,
bool unsafe)
{
int i;
for (i = 0; i < n; i++) {
if (!guest_faults[i].valid)
continue;
if (unsafe && mmu_invalidate_retry_gfn_unsafe(kvm, seq, guest_faults[i].gfn))
return true;
if (!unsafe && mmu_invalidate_retry_gfn(kvm, seq, guest_faults[i].gfn))
return true;
}
return false;
}
static inline int kvm_s390_get_guest_pages(struct kvm *kvm, struct guest_fault *guest_faults,
gfn_t start, int n_pages, bool write_attempt)
{
int i, rc;
for (i = 0; i < n_pages; i++) {
rc = kvm_s390_get_guest_page(kvm, guest_faults + i, start + i, write_attempt);
if (rc)
break;
}
return rc;
}
#define kvm_s390_release_faultin_array(kvm, array, ignore) \
kvm_s390_release_multiple(kvm, array, ARRAY_SIZE(array), ignore)
#define kvm_s390_array_needs_retry_unsafe(kvm, seq, array) \
kvm_s390_multiple_faults_need_retry(kvm, seq, array, ARRAY_SIZE(array), true)
#define kvm_s390_array_needs_retry_safe(kvm, seq, array) \
kvm_s390_multiple_faults_need_retry(kvm, seq, array, ARRAY_SIZE(array), false)
#endif /* __KVM_S390_FAULTIN_H */
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