linux-kernel - [RFC PATCH v3 03/16] KVM: TDX: Pass KVM page level to tdh_mem_page_add() and tdh_mem_page

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Message-Id: <c8d5a3cf1f649112e6387bdf1108d9864aceec3c.1673541292.git.isaku.yamahata@intel.com>
Date:   Thu, 12 Jan 2023 08:43:55 -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>,
        David Matlack <dmatlack@...gle.com>,
        Xiaoyao Li <xiaoyao.li@...el.com>
Subject: [RFC PATCH v3 03/16] KVM: TDX: Pass KVM page level to tdh_mem_page_add() and tdh_mem_page_aug()

From: Xiaoyao Li <xiaoyao.li@...el.com>

Level info is needed in tdh_clflush_page() to generate the correct page
size.

Besides, explicitly pass level info to SEAMCALL instead of assuming
it's zero. It works naturally when 2MB support lands.

Signed-off-by: Xiaoyao Li <xiaoyao.li@...el.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
---
 arch/x86/kvm/vmx/tdx.c     |  7 ++++---
 arch/x86/kvm/vmx/tdx_ops.h | 19 ++++++++++++-------
 2 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 487ba90a0b7c..8959a019b87a 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -1324,6 +1324,7 @@ static void tdx_unpin(struct kvm *kvm, kvm_pfn_t pfn)
 static int tdx_sept_set_private_spte(struct kvm *kvm, gfn_t gfn,
 				     enum pg_level level, kvm_pfn_t pfn)
 {
+	int tdx_level = pg_level_to_tdx_sept_level(level);
 	struct kvm_tdx *kvm_tdx = to_kvm_tdx(kvm);
 	hpa_t hpa = pfn_to_hpa(pfn);
 	gpa_t gpa = gfn_to_gpa(gfn);
@@ -1348,7 +1349,7 @@ static int tdx_sept_set_private_spte(struct kvm *kvm, gfn_t gfn,
 		if (KVM_BUG_ON(level != PG_LEVEL_4K, kvm))
 			return -EINVAL;
 
-		err = tdh_mem_page_aug(kvm_tdx->tdr_pa, gpa, hpa, &out);
+		err = tdh_mem_page_aug(kvm_tdx->tdr_pa, gpa, tdx_level, hpa, &out);
 		if (err == TDX_ERROR_SEPT_BUSY) {
 			tdx_unpin(kvm, pfn);
 			return -EAGAIN;
@@ -1387,8 +1388,8 @@ static int tdx_sept_set_private_spte(struct kvm *kvm, gfn_t gfn,
 	kvm_tdx->source_pa = INVALID_PAGE;
 
 	do {
-		err = tdh_mem_page_add(kvm_tdx->tdr_pa, gpa, hpa, source_pa,
-				       &out);
+		err = tdh_mem_page_add(kvm_tdx->tdr_pa, gpa, tdx_level, hpa,
+				       source_pa, &out);
 		/*
 		 * This path is executed during populating initial guest memory
 		 * image. i.e. before running any vcpu.  Race is rare.
diff --git a/arch/x86/kvm/vmx/tdx_ops.h b/arch/x86/kvm/vmx/tdx_ops.h
index 4db983b1dc94..4b03acce5003 100644
--- a/arch/x86/kvm/vmx/tdx_ops.h
+++ b/arch/x86/kvm/vmx/tdx_ops.h
@@ -19,6 +19,11 @@
 
 void pr_tdx_error(u64 op, u64 error_code, const struct tdx_module_output *out);
 
+static inline enum pg_level tdx_sept_level_to_pg_level(int tdx_level)
+{
+	return tdx_level + 1;
+}
+
 static inline void tdx_clflush_page(hpa_t addr, enum pg_level level)
 {
 	clflush_cache_range(__va(addr), KVM_HPAGE_SIZE(level));
@@ -60,11 +65,11 @@ static inline u64 tdh_mng_addcx(hpa_t tdr, hpa_t addr)
 	return __seamcall(TDH_MNG_ADDCX, addr, tdr, 0, 0, NULL);
 }
 
-static inline u64 tdh_mem_page_add(hpa_t tdr, gpa_t gpa, hpa_t hpa, hpa_t source,
-				   struct tdx_module_output *out)
+static inline u64 tdh_mem_page_add(hpa_t tdr, gpa_t gpa, int level, hpa_t hpa,
+				   hpa_t source, struct tdx_module_output *out)
 {
-	tdx_clflush_page(hpa, PG_LEVEL_4K);
-	return seamcall_sept(TDH_MEM_PAGE_ADD, gpa, tdr, hpa, source, out);
+	tdx_clflush_page(hpa, tdx_sept_level_to_pg_level(level));
+	return seamcall_sept(TDH_MEM_PAGE_ADD, gpa | level, tdr, hpa, source, out);
 }
 
 static inline u64 tdh_mem_sept_add(hpa_t tdr, gpa_t gpa, int level, hpa_t page,
@@ -93,11 +98,11 @@ static inline u64 tdh_mem_page_relocate(hpa_t tdr, gpa_t gpa, hpa_t hpa,
 	return __seamcall(TDH_MEM_PAGE_RELOCATE, gpa, tdr, hpa, 0, out);
 }
 
-static inline u64 tdh_mem_page_aug(hpa_t tdr, gpa_t gpa, hpa_t hpa,
+static inline u64 tdh_mem_page_aug(hpa_t tdr, gpa_t gpa, int level, hpa_t hpa,
 				   struct tdx_module_output *out)
 {
-	tdx_clflush_page(hpa, PG_LEVEL_4K);
-	return seamcall_sept(TDH_MEM_PAGE_AUG, gpa, tdr, hpa, 0, out);
+	tdx_clflush_page(hpa, tdx_sept_level_to_pg_level(level));
+	return seamcall_sept(TDH_MEM_PAGE_AUG, gpa | level, tdr, hpa, 0, out);
 }
 
 static inline u64 tdh_mem_range_block(hpa_t tdr, gpa_t gpa, int level,
-- 
2.25.1