linux-kernel - [PATCH v19 010/130] KVM: x86: Pass is_private to gmem hook of gmem_max

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Message-Id: <8108cc2b8ff01ec22de68f0d0758ef0671db43fc.1708933498.git.isaku.yamahata@intel.com>
Date: Mon, 26 Feb 2024 00:25:12 -0800
From: isaku.yamahata@...el.com
To: kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: isaku.yamahata@...el.com,
	isaku.yamahata@...il.com,
	Paolo Bonzini <pbonzini@...hat.com>,
	erdemaktas@...gle.com,
	Sean Christopherson <seanjc@...gle.com>,
	Sagi Shahar <sagis@...gle.com>,
	Kai Huang <kai.huang@...el.com>,
	chen.bo@...el.com,
	hang.yuan@...el.com,
	tina.zhang@...el.com
Subject: [PATCH v19 010/130] KVM: x86: Pass is_private to gmem hook of gmem_max_level

From: Isaku Yamahata <isaku.yamahata@...el.com>

TDX wants to know the faulting address is shared or private so that the max
level is limited by Secure-EPT or not.  Because fault->gfn doesn't include
shared bit, gfn doesn't tell if the faulting address is shared or not.
Pass is_private for TDX case.

TDX logic will be if (!is_private) return 0; else return PG_LEVEL_4K.

Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 arch/x86/include/asm/kvm_host.h | 3 ++-
 arch/x86/kvm/mmu/mmu.c          | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index d15f5b4b1656..57ce89fc2740 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1797,7 +1797,8 @@ struct kvm_x86_ops {
 
 	gva_t (*get_untagged_addr)(struct kvm_vcpu *vcpu, gva_t gva, unsigned int flags);
 
-	int (*gmem_max_level)(struct kvm *kvm, kvm_pfn_t pfn, gfn_t gfn, u8 *max_level);
+	int (*gmem_max_level)(struct kvm *kvm, kvm_pfn_t pfn, gfn_t gfn,
+			      bool is_private, u8 *max_level);
 };
 
 struct kvm_x86_nested_ops {
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 1e5e12d2707d..22db1a9f528a 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -4324,7 +4324,8 @@ static int kvm_faultin_pfn_private(struct kvm_vcpu *vcpu,
 
 	max_level = kvm_max_level_for_order(max_order);
 	r = static_call(kvm_x86_gmem_max_level)(vcpu->kvm, fault->pfn,
-						fault->gfn, &max_level);
+						fault->gfn, fault->is_private,
+						&max_level);
 	if (r) {
 		kvm_release_pfn_clean(fault->pfn);
 		return r;
-- 
2.25.1