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KVM: x86/mmu: Enforce max_level on HugeTLB mappings

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Limit KVM's mapping level for HugeTLB based on its calculated max_level.
The max_level check prior to invoking host_mapping_level() only filters
out the case where KVM cannot create a 2mb mapping, it doesn't handle
the scenario where KVM can create a 2mb but not 1gb mapping, and the
host is using a 1gb HugeTLB mapping.

Fixes: 2f57b7051f ("KVM: x86/mmu: Persist gfn_lpage_is_disallowed() to max_level")
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2020-01-08 12:24:35 -08:00 committed by Paolo Bonzini
parent dc9ce71e66
commit 22b1d57b03
1 changed files with 3 additions and 2 deletions
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5
arch/x86/kvm/mmu/mmu.c
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@ -1330,7 +1330,7 @@ gfn_to_memslot_dirty_bitmap(struct kvm_vcpu *vcpu, gfn_t gfn,
static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn,
int *max_levelp)
{
int max_level = *max_levelp;
int host_level, max_level = *max_levelp;
struct kvm_memory_slot *slot;
if (unlikely(max_level == PT_PAGE_TABLE_LEVEL))
@ -1362,7 +1362,8 @@ static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn,
* So, do not propagate host_mapping_level() to max_level as KVM can
* still promote the guest mapping to a huge page in the THP case.
*/
return host_mapping_level(vcpu->kvm, large_gfn);
host_level = host_mapping_level(vcpu->kvm, large_gfn);
return min(host_level, max_level);
}
/*