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KVM: guest_memfd: Remove partial hugepage handling from kvm_gmem_populate()

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kvm_gmem_populate(), and the associated post-populate callbacks, have
some limited support for dealing with guests backed by hugepages by
passing the order information along to each post-populate callback and
iterating through the pages passed to kvm_gmem_populate() in
hugepage-chunks.

However, guest_memfd doesn't yet support hugepages, and in most cases
additional changes in the kvm_gmem_populate() path would also be needed
to actually allow for this functionality.

This makes the existing code unnecessarily complex, and makes changes
difficult to work through upstream due to theoretical impacts on
hugepage support that can't be considered properly without an actual
hugepage implementation to reference. So for now, remove what's there
so changes for things like in-place conversion can be
implemented/reviewed more efficiently.

Suggested-by: Vishal Annapurve <vannapurve@google.com>
Co-developed-by: Vishal Annapurve <vannapurve@google.com>
Signed-off-by: Vishal Annapurve <vannapurve@google.com>
Tested-by: Vishal Annapurve <vannapurve@google.com>
Tested-by: Kai Huang <kai.huang@intel.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>
Tested-by: Yan Zhao <yan.y.zhao@intel.com>
Reviewed-by: Yan Zhao <yan.y.zhao@intel.com>
Link: https://patch.msgid.link/20260108214622.1084057-3-michael.roth@amd.com
[sean: check for !IS_ERR() before checking folio_order()]
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Michael Roth
2026-01-08 15:46:18 -06:00
committed by Sean Christopherson
parent 60b590de8b
commit 6538b6221c
4 changed files with 60 additions and 76 deletions
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2
include/linux/kvm_host.h
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@@ -2581,7 +2581,7 @@ int kvm_arch_gmem_prepare(struct kvm *kvm, gfn_t gfn, kvm_pfn_t pfn, int max_ord
* Returns the number of pages that were populated.
*/
typedef int (*kvm_gmem_populate_cb)(struct kvm *kvm, gfn_t gfn, kvm_pfn_t pfn,
void __user *src, int order, void *opaque);
void __user *src, void *opaque);
long kvm_gmem_populate(struct kvm *kvm, gfn_t gfn, void __user *src, long npages,
kvm_gmem_populate_cb post_populate, void *opaque);