linux-kernel - [PATCH v6 2/9] x86/cpu: KVM: Move macro to encode PAT value to common header

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Message-ID: <20240309012725.1409949-3-seanjc@google.com>
Date: Fri,  8 Mar 2024 17:27:18 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Andy Lutomirski <luto@...nel.org>, Peter Zijlstra <peterz@...radead.org>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org, 
	Shan Kang <shan.kang@...el.com>, Kai Huang <kai.huang@...el.com>, Xin Li <xin3.li@...el.com>
Subject: [PATCH v6 2/9] x86/cpu: KVM: Move macro to encode PAT value to common header

Move pat/memtype.c's PAT() macro to msr-index.h as PAT_VALUE(), and use it
in KVM to define the default (Power-On / RESET) PAT value instead of open
coding an inscrutable magic number.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/include/asm/msr-index.h |  6 ++++++
 arch/x86/kvm/x86.h               |  3 ++-
 arch/x86/mm/pat/memtype.c        | 12 +++---------
 3 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 29f0ea78e41c..af71f8bb76ae 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -352,6 +352,12 @@
 
 #define MSR_IA32_CR_PAT			0x00000277
 
+#define PAT_VALUE(p0, p1, p2, p3, p4, p5, p6, p7)			\
+	((X86_MEMTYPE_ ## p0)      | (X86_MEMTYPE_ ## p1 << 8)  |	\
+	(X86_MEMTYPE_ ## p2 << 16) | (X86_MEMTYPE_ ## p3 << 24) |	\
+	(X86_MEMTYPE_ ## p4 << 32) | (X86_MEMTYPE_ ## p5 << 40) |	\
+	(X86_MEMTYPE_ ## p6 << 48) | (X86_MEMTYPE_ ## p7 << 56))
+
 #define MSR_IA32_DEBUGCTLMSR		0x000001d9
 #define MSR_IA32_LASTBRANCHFROMIP	0x000001db
 #define MSR_IA32_LASTBRANCHTOIP		0x000001dc
diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h
index a8b71803777b..753403639e72 100644
--- a/arch/x86/kvm/x86.h
+++ b/arch/x86/kvm/x86.h
@@ -87,7 +87,8 @@ static inline unsigned int __shrink_ple_window(unsigned int val,
 	return max(val, min);
 }
 
-#define MSR_IA32_CR_PAT_DEFAULT  0x0007040600070406ULL
+#define MSR_IA32_CR_PAT_DEFAULT	\
+	PAT_VALUE(WB, WT, UC_MINUS, UC, WB, WT, UC_MINUS, UC)
 
 void kvm_service_local_tlb_flush_requests(struct kvm_vcpu *vcpu);
 int kvm_check_nested_events(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/mm/pat/memtype.c b/arch/x86/mm/pat/memtype.c
index 3e0ba044925f..f2dedddfbaf2 100644
--- a/arch/x86/mm/pat/memtype.c
+++ b/arch/x86/mm/pat/memtype.c
@@ -245,12 +245,6 @@ void pat_cpu_init(void)
 void __init pat_bp_init(void)
 {
 	struct cpuinfo_x86 *c = &boot_cpu_data;
-#define PAT(p0, p1, p2, p3, p4, p5, p6, p7)				\
-	((X86_MEMTYPE_ ## p0)      | (X86_MEMTYPE_ ## p1 << 8)  |	\
-	(X86_MEMTYPE_ ## p2 << 16) | (X86_MEMTYPE_ ## p3 << 24) |	\
-	(X86_MEMTYPE_ ## p4 << 32) | (X86_MEMTYPE_ ## p5 << 40) |	\
-	(X86_MEMTYPE_ ## p6 << 48) | (X86_MEMTYPE_ ## p7 << 56))
-
 
 	if (!IS_ENABLED(CONFIG_X86_PAT))
 		pr_info_once("x86/PAT: PAT support disabled because CONFIG_X86_PAT is disabled in the kernel.\n");
@@ -281,7 +275,7 @@ void __init pat_bp_init(void)
 		 * NOTE: When WC or WP is used, it is redirected to UC- per
 		 * the default setup in __cachemode2pte_tbl[].
 		 */
-		pat_msr_val = PAT(WB, WT, UC_MINUS, UC, WB, WT, UC_MINUS, UC);
+		pat_msr_val = PAT_VALUE(WB, WT, UC_MINUS, UC, WB, WT, UC_MINUS, UC);
 	}
 
 	/*
@@ -321,7 +315,7 @@ void __init pat_bp_init(void)
 		 * NOTE: When WT or WP is used, it is redirected to UC- per
 		 * the default setup in __cachemode2pte_tbl[].
 		 */
-		pat_msr_val = PAT(WB, WC, UC_MINUS, UC, WB, WC, UC_MINUS, UC);
+		pat_msr_val = PAT_VALUE(WB, WC, UC_MINUS, UC, WB, WC, UC_MINUS, UC);
 	} else {
 		/*
 		 * Full PAT support.  We put WT in slot 7 to improve
@@ -349,7 +343,7 @@ void __init pat_bp_init(void)
 		 * The reserved slots are unused, but mapped to their
 		 * corresponding types in the presence of PAT errata.
 		 */
-		pat_msr_val = PAT(WB, WC, UC_MINUS, UC, WB, WP, UC_MINUS, WT);
+		pat_msr_val = PAT_VALUE(WB, WC, UC_MINUS, UC, WB, WP, UC_MINUS, WT);
 	}
 
 	memory_caching_control |= CACHE_PAT;
-- 
2.44.0.278.ge034bb2e1d-goog