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[RFC,11/12] KVM: x86/mmu: Export kvm_is_mmio_pfn()

Message ID 20250107142719.179636-12-yilun.xu@linux.intel.com (mailing list archive)
State New
Headers show
Series Private MMIO support for private assigned dev | expand

Commit Message

Xu Yilun Jan. 7, 2025, 2:27 p.m. UTC 
From: Xu Yilun <yilun.xu@intel.com>

Export kvm_is_mmio_pfn() for KVM TDX to decide which seamcall should be
used to setup SEPT leaf entry.

TDX Module requires tdh_mem_page_aug() for memory page setup,
and tdh_mmio_map() for MMIO setup.

Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Signed-off-by: Xu Yilun <yilun.xu@intel.com>
---
 arch/x86/kvm/mmu.h      | 1 +
 arch/x86/kvm/mmu/spte.c | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)
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Patch

diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h
index e40097c7e8d4..23ff0e6c9ef6 100644
--- a/arch/x86/kvm/mmu.h
+++ b/arch/x86/kvm/mmu.h
@@ -102,6 +102,7 @@  void kvm_mmu_sync_roots(struct kvm_vcpu *vcpu);
 void kvm_mmu_sync_prev_roots(struct kvm_vcpu *vcpu);
 void kvm_mmu_track_write(struct kvm_vcpu *vcpu, gpa_t gpa, const u8 *new,
 			 int bytes);
+bool kvm_is_mmio_pfn(kvm_pfn_t pfn);
 
 static inline int kvm_mmu_reload(struct kvm_vcpu *vcpu)
 {
diff --git a/arch/x86/kvm/mmu/spte.c b/arch/x86/kvm/mmu/spte.c
index e819d16655b6..0a9a81afba93 100644
--- a/arch/x86/kvm/mmu/spte.c
+++ b/arch/x86/kvm/mmu/spte.c
@@ -105,7 +105,7 @@  u64 make_mmio_spte(struct kvm_vcpu *vcpu, u64 gfn, unsigned int access)
 	return spte;
 }
 
-static bool kvm_is_mmio_pfn(kvm_pfn_t pfn)
+bool kvm_is_mmio_pfn(kvm_pfn_t pfn)
 {
 	if (pfn_valid(pfn))
 		return !is_zero_pfn(pfn) && PageReserved(pfn_to_page(pfn)) &&
@@ -125,6 +125,7 @@  static bool kvm_is_mmio_pfn(kvm_pfn_t pfn)
 				     pfn_to_hpa(pfn + 1) - 1,
 				     E820_TYPE_RAM);
 }
+EXPORT_SYMBOL_GPL(kvm_is_mmio_pfn);
 
 /*
  * Returns true if the SPTE has bits that may be set without holding mmu_lock.