[v5,5/7] KVM: x86/mmu: Make kvm_mmu_do_page_fault() return mapped level

Commit Message

Paolo Bonzini July 10, 2024, 5:40 p.m. UTC

The guest memory population logic will need to know what page size or level
(4K, 2M, ...) is mapped.

Signed-off-by: Isaku Yamahata <[e-mail]>
Message-ID: <eabc3f[e-mail]>
Signed-off-by: Paolo Bonzini <[e-mail]>
---
 arch/x86/kvm/mmu/mmu.c          | 4 ++--
 arch/x86/kvm/mmu/mmu_internal.h | 5 ++++-
 2 files changed, 6 insertions(+), 3 deletions(-)

Patch

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 8c2c5c0afba1..152b30fa22ad 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -4292,7 +4292,7 @@  void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, struct kvm_async_pf *work)
 		return;
 
 	r = kvm_mmu_do_page_fault(vcpu, work->cr2_or_gpa, work->arch.error_code,
-				  true, NULL);
+				  true, NULL, NULL);
 
 	/*
 	 * Account fixed page faults, otherwise they'll never be counted, but
@@ -5937,7 +5937,7 @@  int noinline kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 err
 		vcpu->stat.pf_taken++;
 
 		r = kvm_mmu_do_page_fault(vcpu, cr2_or_gpa, error_code, false,
-					  &emulation_type);
+					  &emulation_type, NULL);
 		if (KVM_BUG_ON(r == RET_PF_INVALID, vcpu->kvm))
 			return -EIO;
 	}
diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h
index 444f55a5eed7..1721d97743e9 100644
--- a/arch/x86/kvm/mmu/mmu_internal.h
+++ b/arch/x86/kvm/mmu/mmu_internal.h
@@ -288,7 +288,8 @@  static inline void kvm_mmu_prepare_memory_fault_exit(struct kvm_vcpu *vcpu,
 }
 
 static inline int kvm_mmu_do_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
-					u64 err, bool prefetch, int *emulation_type)
+					u64 err, bool prefetch,
+					int *emulation_type, u8 *level)
 {
 	struct kvm_page_fault fault = {
 		.addr = cr2_or_gpa,
@@ -336,6 +337,8 @@  static inline int kvm_mmu_do_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
 
 	if (fault.write_fault_to_shadow_pgtable && emulation_type)
 		*emulation_type |= EMULTYPE_WRITE_PF_TO_SP;
+	if (level)
+		*level = fault.goal_level;
 
 	return r;
 }