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| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2022-06-28 18:02:28 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2022-06-29 19:39:58 +1000 |
| commit | 4dee21e0f2520f5032b0abce0ecae593a71bd19d (patch) | |
| tree | 9f4f23d07e975c8c836e5b49081f28f674585e96 /arch/powerpc/kvm/book3s_64_vio.c | |
| parent | f5c847ea19d323974d6f7c7e9fa4858ce0727096 (diff) | |
| download | lwn-4dee21e0f2520f5032b0abce0ecae593a71bd19d.tar.gz lwn-4dee21e0f2520f5032b0abce0ecae593a71bd19d.zip | |
KVM: PPC: Do not warn when userspace asked for too big TCE table
KVM manages emulated TCE tables for guest LIOBNs by a two level table
which maps up to 128TiB with 16MB IOMMU pages (enabled in QEMU by default)
and MAX_ORDER=11 (the kernel's default). Note that the last level of
the table is allocated when actual TCE is updated.
However these tables are created via ioctl() on kvmfd and the userspace
can trigger WARN_ON_ONCE_GFP(order >= MAX_ORDER, gfp) in mm/page_alloc.c
and flood dmesg.
This adds __GFP_NOWARN.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220628080228.1508847-1-aik@ozlabs.ru
Diffstat (limited to 'arch/powerpc/kvm/book3s_64_vio.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_64_vio.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s_64_vio.c index d6589c4fe889..40864373ef87 100644 --- a/arch/powerpc/kvm/book3s_64_vio.c +++ b/arch/powerpc/kvm/book3s_64_vio.c @@ -307,7 +307,7 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kvm, return ret; ret = -ENOMEM; - stt = kzalloc(struct_size(stt, pages, npages), GFP_KERNEL); + stt = kzalloc(struct_size(stt, pages, npages), GFP_KERNEL | __GFP_NOWARN); if (!stt) goto fail_acct; |