linux-kernel - [RFC PATCH 11/12] KVM: x86/mmu: Export kvm_is_mmio

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Message-Id: <20250107142719.179636-12-yilun.xu@linux.intel.com>
Date: Tue,  7 Jan 2025 22:27:18 +0800
From: Xu Yilun <yilun.xu@...ux.intel.com>
To: kvm@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linux-media@...r.kernel.org,
	linaro-mm-sig@...ts.linaro.org,
	sumit.semwal@...aro.org,
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Cc: yilun.xu@...el.com,
	yilun.xu@...ux.intel.com,
	linux-coco@...ts.linux.dev,
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Subject: [RFC PATCH 11/12] KVM: x86/mmu: Export kvm_is_mmio_pfn()

From: Xu Yilun <yilun.xu@...el.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@...el.com>
Signed-off-by: Xu Yilun <yilun.xu@...el.com>
---
 arch/x86/kvm/mmu.h      | 1 +
 arch/x86/kvm/mmu/spte.c | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

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.
-- 
2.25.1