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KVM: x86/mmu: WARN if TDP MMU's set_tdp_spte() sees multiple GFNs

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WARN if set_tdp_spte() is invoked with multipel GFNs.  It is specifically
a callback to handle a single host PTE being changed.  Consuming the
@end parameter also eliminates the confusing 'unused' parameter.

Cc: Ben Gardon <bgardon@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210226010329.1766033-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson
2021-02-25 17:03:26 -08:00
committed by Paolo Bonzini
parent f055ab634c
commit 74fe0f5474
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kvm/mmu/tdp_mmu.c
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@@ -1020,7 +1020,7 @@ int kvm_tdp_mmu_test_age_hva(struct kvm *kvm, unsigned long hva)
* Returns non-zero if a flush is needed before releasing the MMU lock.
*/
static int set_tdp_spte(struct kvm *kvm, struct kvm_memory_slot *slot,
struct kvm_mmu_page *root, gfn_t gfn, gfn_t unused,
struct kvm_mmu_page *root, gfn_t gfn, gfn_t end,
unsigned long data)
{
struct tdp_iter iter;
@@ -1031,7 +1031,7 @@ static int set_tdp_spte(struct kvm *kvm, struct kvm_memory_slot *slot,
rcu_read_lock();
WARN_ON(pte_huge(*ptep));
WARN_ON(pte_huge(*ptep) || (gfn + 1) != end);
new_pfn = pte_pfn(*ptep);