From: Alexey Kardashevskiy Date: Tue, 28 Jun 2022 08:02:28 +0000 (+1000) Subject: KVM: PPC: Do not warn when userspace asked for too big TCE table X-Git-Tag: baikal/mips/sdk6.1~5097^2~95^2~1 X-Git-Url: https://git.baikalelectronics.ru/?a=commitdiff_plain;h=d5a2bb6b8bbdbb6f0c3c064c2838a6c5773e6930;p=kernel.git 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 Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20220628080228.1508847-1-aik@ozlabs.ru --- diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s_64_vio.c index d6589c4fe8899..40864373ef876 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;