linux-kernel - [RFC PATCH v5 02/16] KVM: TDX: Pass page level to cache flush before TDX SEAMCALL

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Message-Id: <4c5c2e204b9369d17988a988871b86c7c753cb7b.1697473009.git.isaku.yamahata@intel.com>
Date:   Mon, 16 Oct 2023 09:20:53 -0700
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>,
        Kai Huang <kai.huang@...el.com>,
        Zhi Wang <zhi.wang.linux@...il.com>, chen.bo@...el.com,
        hang.yuan@...el.com, tina.zhang@...el.com,
        Xiaoyao Li <xiaoyao.li@...el.com>
Subject: [RFC PATCH v5 02/16] KVM: TDX: Pass page level to cache flush 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>
---
 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 c716e54be66a..c9de1b48a022 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/archrandom.h>
 #include <asm/cacheflush.h>
 #include <asm/asm.h>
@@ -62,6 +63,11 @@ static inline u64 tdx_seamcall(u64 op, u64 rcx, u64 rdx, u64 r8, u64 r9,
 void pr_tdx_error(u64 op, u64 error_code, const struct tdx_module_args *out);
 #endif
 
+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
@@ -94,21 +100,21 @@ static inline u64 tdx_seamcall_sept(u64 op, u64 rcx, u64 rdx, u64 r8, u64 r9,
 
 static inline u64 tdh_mng_addcx(hpa_t tdr, hpa_t addr)
 {
-	clflush_cache_range(__va(addr), PAGE_SIZE);
+	tdx_clflush_page(addr, PG_LEVEL_4K);
 	return tdx_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_args *out)
 {
-	clflush_cache_range(__va(hpa), PAGE_SIZE);
+	tdx_clflush_page(hpa, PG_LEVEL_4K);
 	return tdx_seamcall_sept(TDH_MEM_PAGE_ADD, gpa, tdr, hpa, source, out);
 }
 
 static inline u64 tdh_mem_sept_add(hpa_t tdr, gpa_t gpa, int level, hpa_t page,
 				   struct tdx_module_args *out)
 {
-	clflush_cache_range(__va(page), PAGE_SIZE);
+	tdx_clflush_page(page, PG_LEVEL_4K);
 	return tdx_seamcall_sept(TDH_MEM_SEPT_ADD, gpa | level, tdr, page, 0, out);
 }
 
@@ -126,21 +132,21 @@ static inline u64 tdh_mem_sept_remove(hpa_t tdr, gpa_t gpa, int level,
 
 static inline u64 tdh_vp_addcx(hpa_t tdvpr, hpa_t addr)
 {
-	clflush_cache_range(__va(addr), PAGE_SIZE);
+	tdx_clflush_page(addr, PG_LEVEL_4K);
 	return tdx_seamcall(TDH_VP_ADDCX, addr, tdvpr, 0, 0, NULL);
 }
 
 static inline u64 tdh_mem_page_relocate(hpa_t tdr, gpa_t gpa, hpa_t hpa,
 					struct tdx_module_args *out)
 {
-	clflush_cache_range(__va(hpa), PAGE_SIZE);
+	tdx_clflush_page(hpa, PG_LEVEL_4K);
 	return tdx_seamcall_sept(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,
 				   struct tdx_module_args *out)
 {
-	clflush_cache_range(__va(hpa), PAGE_SIZE);
+	tdx_clflush_page(hpa, PG_LEVEL_4K);
 	return tdx_seamcall_sept(TDH_MEM_PAGE_AUG, gpa, tdr, hpa, 0, out);
 }
 
@@ -157,13 +163,13 @@ static inline u64 tdh_mng_key_config(hpa_t tdr)
 
 static inline u64 tdh_mng_create(hpa_t tdr, int hkid)
 {
-	clflush_cache_range(__va(tdr), PAGE_SIZE);
+	tdx_clflush_page(tdr, PG_LEVEL_4K);
 	return tdx_seamcall(TDH_MNG_CREATE, tdr, hkid, 0, 0, NULL);
 }
 
 static inline u64 tdh_vp_create(hpa_t tdr, hpa_t tdvpr)
 {
-	clflush_cache_range(__va(tdvpr), PAGE_SIZE);
+	tdx_clflush_page(tdvpr, PG_LEVEL_4K);
 	return tdx_seamcall(TDH_VP_CREATE, tdvpr, tdr, 0, 0, NULL);
 }
 
-- 
2.25.1