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KVM: x86/mmu: Avoid modulo operator on 64-bit value to fix i386 build 

Replace a modulo operator with the more common pattern for computing the
gfn "offset" of a huge page to fix an i386 build error.

  arch/x86/kvm/mmu/tdp_mmu.c:212: undefined reference to `__umoddi3'

In fact, almost all of tdp_mmu.c can be elided on 32-bit builds, but
that is a much larger patch.

Fixes: 2f2fad0897 ("kvm: x86/mmu: Add functions to handle changed TDP SPTEs")
Reported-by: Daniel Díaz <daniel.diaz@linaro.org>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20201024031150.9318-1-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2020-10-23 20:11:50 -07:00 committed by Paolo Bonzini
parent 29cf0f5007
commit 764388ce59
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/mmu/tdp_mmu.c
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@ -209,7 +209,7 @@ static void __handle_changed_spte(struct kvm *kvm, int as_id, gfn_t gfn,
WARN_ON(level > PT64_ROOT_MAX_LEVEL);
WARN_ON(level < PG_LEVEL_4K);
WARN_ON(gfn % KVM_PAGES_PER_HPAGE(level));
WARN_ON(gfn & (KVM_PAGES_PER_HPAGE(level) - 1));
/*
* If this warning were to trigger it would indicate that there was a