KVM: x86/mmu: Grab nx_lpage_splits as an unsigned long before division

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Snapshot kvm->stats.nx_lpage_splits into a local unsigned long to avoid
64-bit division on 32-bit kernels.  Casting to an unsigned long is safe
because the maximum number of shadow pages, n_max_mmu_pages, is also an
unsigned long, i.e. KVM will start recycling shadow pages before the
number of splits can exceed a 32-bit value.

  ERROR: modpost: "__udivdi3" [arch/x86/kvm/kvm.ko] undefined!

Fixes: 7ee093d4f3f5 ("KVM: switch per-VM stats to u64")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210615162905.2132937-1-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Sean Christopherson 2021-06-15 09:29:05 -07:00 • committed by Paolo Bonzini

parent bca66dbcd2

commit ade74e1433

1 changed files with 2 additions and 1 deletions

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arch/x86/kvm/mmu/mmu.c

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