forked from rpms/kernel
52 lines
2.0 KiB
Diff
52 lines
2.0 KiB
Diff
|
From a1116fd67a3178ce220ee6c2c8abe6bf792e26f2 Mon Sep 17 00:00:00 2001
|
||
|
|
From: Kim Phillips <kim.phillips@amd.com>
|
||
|
|
Date: Tue, 24 Jan 2023 10:33:14 -0600
|
||
|
|
Subject: [PATCH 31/36] x86/cpu, kvm: Add the NO_NESTED_DATA_BP feature
|
||
|
|
|
||
|
|
The "Processor ignores nested data breakpoints" feature was being
|
||
|
|
open-coded for KVM. Add the feature to its newly introduced CPUID leaf
|
||
|
|
0x80000021 EAX proper.
|
||
|
|
|
||
|
|
Signed-off-by: Kim Phillips <kim.phillips@amd.com>
|
||
|
|
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
|
||
|
|
Acked-by: Sean Christopherson <seanjc@google.com>
|
||
|
|
Link: https://lore.kernel.org/r/20230124163319.2277355-4-kim.phillips@amd.com
|
||
|
|
(cherry picked from commit a9dc9ec5a1fafc3d2fe7a7b594eefaeaccf89a6b)
|
||
|
|
Signed-off-by: Mridula Shastry <mridula.c.shastry@oracle.com>
|
||
|
|
Reviewed-by: Todd Vierling <todd.vierling@oracle.com>
|
||
|
|
---
|
||
|
|
arch/x86/include/asm/cpufeatures.h | 3 +++
|
||
|
|
arch/x86/kvm/cpuid.c | 2 +-
|
||
|
|
2 files changed, 4 insertions(+), 1 deletion(-)
|
||
|
|
|
||
|
|
diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
|
||
|
|
index ffc806d3a863..ac6e58a79fad 100644
|
||
|
|
--- a/arch/x86/include/asm/cpufeatures.h
|
||
|
|
+++ b/arch/x86/include/asm/cpufeatures.h
|
||
|
|
@@ -421,6 +421,9 @@
|
||
|
|
#define X86_FEATURE_IBRS_EXIT_SET (22*32+ 0) /* "" Set IBRS on kernel exit */
|
||
|
|
#define X86_FEATURE_IBRS_EXIT_SKIP (22*32+ 1) /* "" Skip SPEC_CTRL MSR write on exit */
|
||
|
|
|
||
|
|
+/* AMD-defined Extended Feature 2 EAX, CPUID level 0x80000021 (EAX), word 20 */
|
||
|
|
+#define X86_FEATURE_NO_NESTED_DATA_BP (20*32+ 0) /* "" No Nested Data Breakpoints */
|
||
|
|
+
|
||
|
|
/*
|
||
|
|
* BUG word(s)
|
||
|
|
*/
|
||
|
|
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
|
||
|
|
index 2ca5ac683c44..1a8dbad7e2d9 100644
|
||
|
|
--- a/arch/x86/kvm/cpuid.c
|
||
|
|
+++ b/arch/x86/kvm/cpuid.c
|
||
|
|
@@ -683,7 +683,7 @@ void kvm_set_cpu_caps(void)
|
||
|
|
F(SME_COHERENT));
|
||
|
|
|
||
|
|
kvm_cpu_cap_mask(CPUID_8000_0021_EAX,
|
||
|
|
- BIT(0) /* NO_NESTED_DATA_BP */ |
|
||
|
|
+ F(NO_NESTED_DATA_BP) |
|
||
|
|
BIT(2) /* LFENCE Always serializing */ | 0 /* SmmPgCfgLock */ |
|
||
|
|
BIT(6) /* NULL_SEL_CLR_BASE */ | 0 /* PrefetchCtlMsr */
|
||
|
|
);
|
||
|
|
--
|
||
|
|
2.39.3
|
||
|
|
|