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KVM: s390: Add some helper functions needed for vSIE

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Implement gmap_protect_asce_top_level(), which was a stub. This
function was a stub due to cross dependencies with other patches.

Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda
2026-02-04 16:02:50 +01:00
parent e907ae5301
commit e5f98a6899
1 changed files with 72 additions and 2 deletions
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74
arch/s390/kvm/gmap.c
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@@ -22,6 +22,7 @@
#include "dat.h"
#include "gmap.h"
#include "kvm-s390.h"
#include "faultin.h"
static inline bool kvm_s390_is_in_sie(struct kvm_vcpu *vcpu)
{
@@ -1091,10 +1092,79 @@ static struct gmap *gmap_find_shadow(struct gmap *parent, union asce asce, int e
return NULL;
}
#define CRST_TABLE_PAGES (_CRST_TABLE_SIZE / PAGE_SIZE)
struct gmap_protect_asce_top_level {
unsigned long seq;
struct guest_fault f[CRST_TABLE_PAGES];
};
static inline int __gmap_protect_asce_top_level(struct kvm_s390_mmu_cache *mc, struct gmap *sg,
struct gmap_protect_asce_top_level *context)
{
int rc, i;
guard(write_lock)(&sg->kvm->mmu_lock);
if (kvm_s390_array_needs_retry_safe(sg->kvm, context->seq, context->f))
return -EAGAIN;
scoped_guard(spinlock, &sg->parent->children_lock) {
for (i = 0; i < CRST_TABLE_PAGES; i++) {
if (!context->f[i].valid)
continue;
rc = gmap_protect_rmap(mc, sg, context->f[i].gfn, 0, context->f[i].pfn,
TABLE_TYPE_REGION1 + 1, context->f[i].writable);
if (rc)
return rc;
}
gmap_add_child(sg->parent, sg);
}
kvm_s390_release_faultin_array(sg->kvm, context->f, false);
return 0;
}
static inline int _gmap_protect_asce_top_level(struct kvm_s390_mmu_cache *mc, struct gmap *sg,
struct gmap_protect_asce_top_level *context)
{
int rc;
if (kvm_s390_array_needs_retry_unsafe(sg->kvm, context->seq, context->f))
return -EAGAIN;
do {
rc = kvm_s390_mmu_cache_topup(mc);
if (rc)
return rc;
rc = radix_tree_preload(GFP_KERNEL);
if (rc)
return rc;
rc = __gmap_protect_asce_top_level(mc, sg, context);
radix_tree_preload_end();
} while (rc == -ENOMEM);
return rc;
}
static int gmap_protect_asce_top_level(struct kvm_s390_mmu_cache *mc, struct gmap *sg)
{
KVM_BUG_ON(1, sg->kvm);
return -EINVAL;
struct gmap_protect_asce_top_level context = {};
union asce asce = sg->guest_asce;
int rc;
KVM_BUG_ON(!is_shadow(sg), sg->kvm);
context.seq = sg->kvm->mmu_invalidate_seq;
/* Pairs with the smp_wmb() in kvm_mmu_invalidate_end(). */
smp_rmb();
rc = kvm_s390_get_guest_pages(sg->kvm, context.f, asce.rsto, asce.dt + 1, false);
if (rc > 0)
rc = -EFAULT;
if (!rc)
rc = _gmap_protect_asce_top_level(mc, sg, &context);
if (rc)
kvm_s390_release_faultin_array(sg->kvm, context.f, true);
return rc;
}
/**