linux-kernel - [PATCH v8 03/14] KVM: TDX: Pass KVM page level to tdh_mem_page

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Date: Mon, 26 Feb 2024 00:29:17 -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,
	Xiaoyao Li <xiaoyao.li@...el.com>
Subject: [PATCH v8 03/14] KVM: TDX: Pass KVM page level to tdh_mem_page_aug()

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

Level info is needed in tdx_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>
---
v7:
- Don't pass level to tdh_mem_page_add() as it supports only 4K page.
- catch up for change of tdx_seamcall()
---
 arch/x86/kvm/vmx/tdx.c     |  2 +-
 arch/x86/kvm/vmx/tdx_ops.h | 12 +++++++++---
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index a71093f7c3e3..fd992966379c 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -1470,7 +1470,7 @@ static int tdx_mem_page_aug(struct kvm *kvm, gfn_t gfn,
 	union tdx_sept_entry entry;
 	u64 err;
 
-	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 (unlikely(err == TDX_ERROR_SEPT_BUSY)) {
 		tdx_unpin(kvm, pfn);
 		return -EAGAIN;
diff --git a/arch/x86/kvm/vmx/tdx_ops.h b/arch/x86/kvm/vmx/tdx_ops.h
index 3af124711e98..ef4748943ac7 100644
--- a/arch/x86/kvm/vmx/tdx_ops.h
+++ b/arch/x86/kvm/vmx/tdx_ops.h
@@ -51,6 +51,11 @@ static inline int pg_level_to_tdx_sept_level(enum pg_level level)
 	return level - 1;
 }
 
+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));
@@ -100,6 +105,7 @@ static inline u64 tdh_mng_addcx(hpa_t tdr, hpa_t addr)
 static inline u64 tdh_mem_page_add(hpa_t tdr, gpa_t gpa, hpa_t hpa, hpa_t source,
 				   struct tdx_module_args *out)
 {
+	/* TDH.MEM.PAGE.ADD() suports only 4K page. tdx 4K page level = 0 */
 	struct tdx_module_args in = {
 		.rcx = gpa,
 		.rdx = tdr,
@@ -170,16 +176,16 @@ static inline u64 tdh_mem_page_relocate(hpa_t tdr, gpa_t gpa, hpa_t hpa,
 	return tdx_seamcall_sept(TDH_MEM_PAGE_RELOCATE, &in, 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_args *out)
 {
 	struct tdx_module_args in = {
-		.rcx = gpa,
+		.rcx = gpa | level,
 		.rdx = tdr,
 		.r8 = hpa,
 	};
 
-	tdx_clflush_page(hpa, PG_LEVEL_4K);
+	tdx_clflush_page(hpa, tdx_sept_level_to_pg_level(level));
 	return tdx_seamcall_sept(TDH_MEM_PAGE_AUG, &in, out);
 }
 
-- 
2.25.1