From: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
In the existing x86 KVM MMU code, there is already max_level member in
struct kvm_page_fault with KVM_MAX_HUGEPAGE_LEVEL initial value. The KVM
page fault handler denies page size larger than max_level.
Add per-VM member to indicate the allowed maximum page size with
KVM_MAX_HUGEPAGE_LEVEL as default value and initialize max_level in struct
kvm_page_fault with it.
For the guest TD, the set per-VM value for allows maximum page size to 4K
page size. Then only allowed page size is 4K. It means large page is
disabled.
Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/mmu.h | 2 +-
arch/x86/kvm/mmu/mmu.c | 2 ++
3 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index d8b78d6abc10..d33d79f2af2d 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1053,6 +1053,7 @@ struct kvm_arch {
unsigned long n_requested_mmu_pages;
unsigned long n_max_mmu_pages;
unsigned int indirect_shadow_pages;
+ int tdp_max_page_level;
u8 mmu_valid_gen;
struct hlist_head mmu_page_hash[KVM_NUM_MMU_PAGES];
struct list_head active_mmu_pages;
diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
index 0ae91b8b25df..650989c37f2e 100644
--- a/arch/x86/kvm/mmu.h
+++ b/arch/x86/kvm/mmu.h
@@ -192,7 +192,7 @@ static inline int kvm_mmu_do_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
.is_tdp = likely(vcpu->arch.mmu->page_fault == kvm_tdp_page_fault),
.nx_huge_page_workaround_enabled = is_nx_huge_page_enabled(),
- .max_level = KVM_MAX_HUGEPAGE_LEVEL,
+ .max_level = vcpu->kvm->arch.tdp_max_page_level,
.req_level = PG_LEVEL_4K,
.goal_level = PG_LEVEL_4K,
};
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index a474f2e76d78..e9212394a530 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -5782,6 +5782,8 @@ void kvm_mmu_init_vm(struct kvm *kvm)
node->track_write = kvm_mmu_pte_write;
node->track_flush_slot = kvm_mmu_invalidate_zap_pages_in_memslot;
kvm_page_track_register_notifier(kvm, node);
+
+ kvm->arch.tdp_max_page_level = KVM_MAX_HUGEPAGE_LEVEL;
}
void kvm_mmu_uninit_vm(struct kvm *kvm)
--
2.25.1
