linux-kernel - [PATCH v8 02/14] KVM: TDX: Flush cache based on page size before TDX SEAMCALL

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Date: Mon, 26 Feb 2024 00:29:16 -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>,
	Binbin Wu <binbin.wu@...ux.intel.com>
Subject: [PATCH v8 02/14] KVM: TDX: Flush cache based on page size before TDX SEAMCALL

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

tdh_mem_page_aug() will support 2MB large page in the near future.  Cache
flush also needs to be 2MB instead of 4KB in such cases.  Introduce a
helper function to flush cache with page size info in preparation for large
pages.

Signed-off-by: Xiaoyao Li <xiaoyao.li@...el.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@...el.com>
Reviewed-by: Binbin Wu <binbin.wu@...ux.intel.com>
---
v6:
- catch up tdx_seamcall() change
---
 arch/x86/kvm/vmx/tdx_ops.h | 22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/arch/x86/kvm/vmx/tdx_ops.h b/arch/x86/kvm/vmx/tdx_ops.h
index d27f281152cb..3af124711e98 100644
--- a/arch/x86/kvm/vmx/tdx_ops.h
+++ b/arch/x86/kvm/vmx/tdx_ops.h
@@ -6,6 +6,7 @@
 
 #include <linux/compiler.h>
 
+#include <asm/pgtable_types.h>
 #include <asm/cacheflush.h>
 #include <asm/asm.h>
 #include <asm/kvm_host.h>
@@ -50,6 +51,11 @@ static inline int pg_level_to_tdx_sept_level(enum pg_level level)
 	return level - 1;
 }
 
+static inline void tdx_clflush_page(hpa_t addr, enum pg_level level)
+{
+	clflush_cache_range(__va(addr), KVM_HPAGE_SIZE(level));
+}
+
 /*
  * TDX module acquires its internal lock for resources.  It doesn't spin to get
  * locks because of its restrictions of allowed execution time.  Instead, it
@@ -87,7 +93,7 @@ static inline u64 tdh_mng_addcx(hpa_t tdr, hpa_t addr)
 		.rdx = tdr,
 	};
 
-	clflush_cache_range(__va(addr), PAGE_SIZE);
+	tdx_clflush_page(addr, PG_LEVEL_4K);
 	return tdx_seamcall(TDH_MNG_ADDCX, &in, NULL);
 }
 
@@ -101,7 +107,7 @@ static inline u64 tdh_mem_page_add(hpa_t tdr, gpa_t gpa, hpa_t hpa, hpa_t source
 		.r9 = source,
 	};
 
-	clflush_cache_range(__va(hpa), PAGE_SIZE);
+	tdx_clflush_page(hpa, PG_LEVEL_4K);
 	return tdx_seamcall_sept(TDH_MEM_PAGE_ADD, &in, out);
 }
 
@@ -114,7 +120,7 @@ static inline u64 tdh_mem_sept_add(hpa_t tdr, gpa_t gpa, int level, hpa_t page,
 		.r8 = page,
 	};
 
-	clflush_cache_range(__va(page), PAGE_SIZE);
+	tdx_clflush_page(page, PG_LEVEL_4K);
 	return tdx_seamcall_sept(TDH_MEM_SEPT_ADD, &in, out);
 }
 
@@ -147,7 +153,7 @@ static inline u64 tdh_vp_addcx(hpa_t tdvpr, hpa_t addr)
 		.rdx = tdvpr,
 	};
 
-	clflush_cache_range(__va(addr), PAGE_SIZE);
+	tdx_clflush_page(addr, PG_LEVEL_4K);
 	return tdx_seamcall(TDH_VP_ADDCX, &in, NULL);
 }
 
@@ -160,7 +166,7 @@ static inline u64 tdh_mem_page_relocate(hpa_t tdr, gpa_t gpa, hpa_t hpa,
 		.r8 = hpa,
 	};
 
-	clflush_cache_range(__va(hpa), PAGE_SIZE);
+	tdx_clflush_page(hpa, PG_LEVEL_4K);
 	return tdx_seamcall_sept(TDH_MEM_PAGE_RELOCATE, &in, out);
 }
 
@@ -173,7 +179,7 @@ static inline u64 tdh_mem_page_aug(hpa_t tdr, gpa_t gpa, hpa_t hpa,
 		.r8 = hpa,
 	};
 
-	clflush_cache_range(__va(hpa), PAGE_SIZE);
+	tdx_clflush_page(hpa, PG_LEVEL_4K);
 	return tdx_seamcall_sept(TDH_MEM_PAGE_AUG, &in, out);
 }
 
@@ -204,7 +210,7 @@ static inline u64 tdh_mng_create(hpa_t tdr, int hkid)
 		.rdx = hkid,
 	};
 
-	clflush_cache_range(__va(tdr), PAGE_SIZE);
+	tdx_clflush_page(tdr, PG_LEVEL_4K);
 	return tdx_seamcall(TDH_MNG_CREATE, &in, NULL);
 }
 
@@ -215,7 +221,7 @@ static inline u64 tdh_vp_create(hpa_t tdr, hpa_t tdvpr)
 		.rdx = tdr,
 	};
 
-	clflush_cache_range(__va(tdvpr), PAGE_SIZE);
+	tdx_clflush_page(tdvpr, PG_LEVEL_4K);
 	return tdx_seamcall(TDH_VP_CREATE, &in, NULL);
 }
 
-- 
2.25.1