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authorSean Christopherson <sean.j.christopherson@intel.com>2020-10-23 20:11:50 -0700
committerPaolo Bonzini <pbonzini@redhat.com>2020-10-24 04:05:40 -0400
commit764388ce598f0c3f5c7c39f45279104cb9e18be5 (patch)
treefc6151b1ec98254eb30a050e34a062bcbc55a4fd
parent29cf0f5007a215b51feb0ae25ca5353480d53ead (diff)
downloadlinux-stericsson-764388ce598f0c3f5c7c39f45279104cb9e18be5.tar.gz
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: 2f2fad0897cb ("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>
-rw-r--r--arch/x86/kvm/mmu/tdp_mmu.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/mmu/tdp_mmu.c b/arch/x86/kvm/mmu/tdp_mmu.c
index e246d71b8ea2..27e381c9da6c 100644
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
@@ -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