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KVM: s390: Allow for 2G hugepages

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Change gmap_2g_allowed() to perform the necessary checks to allow for
2G hugepages to be used, instead of returning false. The
GMAP_FLAG_ALLOW_HPAGE_2G gmap flag is now taken into account.

Also add appropriate kerneldoc comments.

Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20260609150930.665370-4-imbrenda@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda
2026-06-09 17:09:29 +02:00
parent 103ff3a50e
commit 46756c0863
1 changed files with 18 additions and 1 deletions
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19
arch/s390/kvm/gmap.c
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@@ -624,10 +624,27 @@ int gmap_try_fixup_minor(struct gmap *gmap, struct guest_fault *fault)
return rc;
}
/**
* gmap_2g_allowed() - Check whether a 2G hugepage is allowed.
* @gmap: The gmap of the guest.
* @f: Describes the fault that is being resolved.
* @slot: The memslot the faulting address belongs to.
*
* The function checks whether the GMAP_FLAG_ALLOW_HPAGE_2G flag is set for
* @gmap, whether the offset of the address in the 2G virtual frame is the
* same as the offset in the physical 2G frame, and finally whether the whole
* 2G page would fit in the given memslot.
*
* Return: true if a 2G hugepage is allowed to back the faulting address, false
* otherwise.
*/
static inline bool gmap_2g_allowed(struct gmap *gmap, struct guest_fault *f,
struct kvm_memory_slot *slot)
{
return false;
return test_bit(GMAP_FLAG_ALLOW_HPAGE_2G, &gmap->flags) &&
!((f->gfn ^ f->pfn) & ~_REGION3_FR_MASK) &&
slot->base_gfn <= ALIGN_DOWN(f->gfn, _PAGES_PER_REGION3) &&
slot->base_gfn + slot->npages >= ALIGN(f->gfn + 1, _PAGES_PER_REGION3);
}
/**