linux-kernel - [PATCH v2 6/8] KVM: x86/mmu: Use common macros to compute 32/64-bit paging masks

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Date:   Tue, 14 Jun 2022 23:33:26 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Lai Jiangshan <jiangshan.ljs@...group.com>
Subject: [PATCH v2 6/8] KVM: x86/mmu: Use common macros to compute 32/64-bit
 paging masks

Dedup the code for generating (most of) the per-type PT_* masks in
paging_tmpl.h.  The relevant macros only vary based on the number of bits
per level, and that smidge of info is already provided in a common form
as PT_LEVEL_BITS.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/mmu/paging.h      | 23 -----------------------
 arch/x86/kvm/mmu/paging_tmpl.h | 25 +++++++++++--------------
 2 files changed, 11 insertions(+), 37 deletions(-)

diff --git a/arch/x86/kvm/mmu/paging.h b/arch/x86/kvm/mmu/paging.h
index 6a63727cc7e8..9de4976b2d46 100644
--- a/arch/x86/kvm/mmu/paging.h
+++ b/arch/x86/kvm/mmu/paging.h
@@ -5,28 +5,5 @@
 
 #define GUEST_PT64_BASE_ADDR_MASK (((1ULL << 52) - 1) & ~(u64)(PAGE_SIZE-1))
 
-#define PT64_LEVEL_BITS 9
-
-#define PT64_INDEX(address, level) __PT_INDEX(address, level, PT64_LEVEL_BITS)
-
-#define PT64_LVL_ADDR_MASK(level) \
-	__PT_LVL_ADDR_MASK(GUEST_PT64_BASE_ADDR_MASK, level, PT64_LEVEL_BITS)
-
-#define PT64_LVL_OFFSET_MASK(level) \
-	__PT_LVL_OFFSET_MASK(GUEST_PT64_BASE_ADDR_MASK, level, PT64_LEVEL_BITS)
-
-
-#define PT32_LEVEL_SHIFT(level) __PT_LEVEL_SHIFT(level, PT32_LEVEL_BITS)
-
-#define PT32_LVL_OFFSET_MASK(level) \
-	__PT_LVL_OFFSET_MASK(PT32_BASE_ADDR_MASK, level, PT32_LEVEL_BITS)
-
-#define PT32_INDEX(address, level) __PT_INDEX(address, level, PT32_LEVEL_BITS)
-
-#define PT32_BASE_ADDR_MASK PAGE_MASK
-
-#define PT32_LVL_ADDR_MASK(level) \
-	__PT_LVL_ADDR_MASK(PT32_BASE_ADDR_MASK, level, PT32_LEVEL_BITS)
-
 #endif /* __KVM_X86_PAGING_H */
 
diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h
index d68cc7a5ef81..4fcde3a18f5f 100644
--- a/arch/x86/kvm/mmu/paging_tmpl.h
+++ b/arch/x86/kvm/mmu/paging_tmpl.h
@@ -16,8 +16,9 @@
  */
 
 /*
- * We need the mmu code to access both 32-bit and 64-bit guest ptes,
- * so the code in this file is compiled twice, once per pte size.
+ * The MMU needs to be able to access/walk 32-bit and 64-bit guest page tables,
+ * as well as guest EPT tables, so the code in this file is compiled thrice,
+ * once per guest PTE type.  The per-type defines are #undef'd at the end.
  */
 
 #if PTTYPE == 64
@@ -25,10 +26,7 @@
 	#define guest_walker guest_walker64
 	#define FNAME(name) paging##64_##name
 	#define PT_BASE_ADDR_MASK GUEST_PT64_BASE_ADDR_MASK
-	#define PT_LVL_ADDR_MASK(lvl) PT64_LVL_ADDR_MASK(lvl)
-	#define PT_LVL_OFFSET_MASK(lvl) PT64_LVL_OFFSET_MASK(lvl)
-	#define PT_INDEX(addr, level) PT64_INDEX(addr, level)
-	#define PT_LEVEL_BITS PT64_LEVEL_BITS
+	#define PT_LEVEL_BITS 9
 	#define PT_GUEST_DIRTY_SHIFT PT_DIRTY_SHIFT
 	#define PT_GUEST_ACCESSED_SHIFT PT_ACCESSED_SHIFT
 	#define PT_HAVE_ACCESSED_DIRTY(mmu) true
@@ -41,10 +39,7 @@
 	#define pt_element_t u32
 	#define guest_walker guest_walker32
 	#define FNAME(name) paging##32_##name
-	#define PT_BASE_ADDR_MASK PT32_BASE_ADDR_MASK
-	#define PT_LVL_ADDR_MASK(lvl) PT32_LVL_ADDR_MASK(lvl)
-	#define PT_LVL_OFFSET_MASK(lvl) PT32_LVL_OFFSET_MASK(lvl)
-	#define PT_INDEX(addr, level) PT32_INDEX(addr, level)
+	#define PT_BASE_ADDR_MASK PAGE_MASK
 	#define PT_LEVEL_BITS PT32_LEVEL_BITS
 	#define PT_MAX_FULL_LEVELS 2
 	#define PT_GUEST_DIRTY_SHIFT PT_DIRTY_SHIFT
@@ -60,10 +55,7 @@
 	#define guest_walker guest_walkerEPT
 	#define FNAME(name) ept_##name
 	#define PT_BASE_ADDR_MASK GUEST_PT64_BASE_ADDR_MASK
-	#define PT_LVL_ADDR_MASK(lvl) PT64_LVL_ADDR_MASK(lvl)
-	#define PT_LVL_OFFSET_MASK(lvl) PT64_LVL_OFFSET_MASK(lvl)
-	#define PT_INDEX(addr, level) PT64_INDEX(addr, level)
-	#define PT_LEVEL_BITS PT64_LEVEL_BITS
+	#define PT_LEVEL_BITS 9
 	#define PT_GUEST_DIRTY_SHIFT 9
 	#define PT_GUEST_ACCESSED_SHIFT 8
 	#define PT_HAVE_ACCESSED_DIRTY(mmu) (!(mmu)->cpu_role.base.ad_disabled)
@@ -72,6 +64,11 @@
 	#error Invalid PTTYPE value
 #endif
 
+/* Common logic, but per-type values.  These also need to be undefined. */
+#define PT_LVL_ADDR_MASK(lvl)	__PT_LVL_ADDR_MASK(PT_BASE_ADDR_MASK, lvl, PT_LEVEL_BITS)
+#define PT_LVL_OFFSET_MASK(lvl)	__PT_LVL_OFFSET_MASK(PT_BASE_ADDR_MASK, lvl, PT_LEVEL_BITS)
+#define PT_INDEX(addr, lvl)	__PT_INDEX(addr, lvl, PT_LEVEL_BITS)
+
 #define PT_GUEST_DIRTY_MASK    (1 << PT_GUEST_DIRTY_SHIFT)
 #define PT_GUEST_ACCESSED_MASK (1 << PT_GUEST_ACCESSED_SHIFT)
 
-- 
2.36.1.476.g0c4daa206d-goog