David Ballesteros 382e5d514b KVM: Ensure memory attributes xarray nodes are accounted to the caller's memcg ...

Explicitly instantiate the memory attributes xarray with XA_FLAGS_ACCOUNT
to ensure that all allocations are accounted to the memcg.  Frustratingly,
memory allocations done in the "fastpath" do not honor the passed in gfp,
even for an explicit xa_reserve().  Only the rare, slow path __xas_nomem()
honors the original gfp.  E.g.

  xa_reserve(..., GFP_KERNEL_ACCOUNT)
  |
  -> ...
     |
     -> __xa_cmpxchg_raw()
        |
        -> xas_store()  <== does not take @gfp
           |
           -> xas_create()
              |
              -> xas_alloc()

The bug was confirmed by observing that a process in a cgroup limited to
256 MiB grew radix_tree_node slab by ~512 MiB while its memory.current
stayed near 0.

Fixes: 5a475554db ("KVM: Introduce per-page memory attributes")
Cc: stable@vger.kernel.org
Assisted-by: Claude-Code:claude-opus-5
Signed-off-by: David Ballesteros <davimaba.v@proton.me>
Link: https://patch.msgid.link/20260915175335.138547-4-davimaba.v@proton.me
[sean: rewrite changelog, tag for stable]
Signed-off-by: Sean Christopherson <seanjc@google.com>

2026-09-22 08:36:06 -07:00

..

kvm

KVM: Ensure memory attributes xarray nodes are accounted to the caller's memcg

2026-09-22 08:36:06 -07:00

lib

irqbypass: Require producers to pass in Linux IRQ number during registration

2025-06-20 13:52:41 -07:00

Makefile

treewide: Add SPDX license identifier - Makefile/Kconfig

2019-05-21 10:50:46 +02:00