71 lines
2.5 KiB
Diff
71 lines
2.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Tom Lendacky <thomas.lendacky@amd.com>
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Date: Wed, 20 Dec 2017 10:55:48 +0000
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Subject: [PATCH] x86/cpu/AMD: Remove now unused definition of MFENCE_RDTSC
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feature
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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CVE-2017-5753
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CVE-2017-5715
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With the switch to using LFENCE_RDTSC on AMD platforms there is no longer
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a need for the MFENCE_RDTSC feature. Remove it usage and definition.
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Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
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Signed-off-by: Andy Whitcroft <apw@canonical.com>
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Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
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(cherry picked from commit 6e6c998937329e9d13d4b239233cd058e8a7730f)
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Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
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---
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arch/x86/include/asm/barrier.h | 3 +--
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arch/x86/include/asm/msr.h | 3 +--
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arch/x86/net/bpf_jit_comp.c | 3 ---
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3 files changed, 2 insertions(+), 7 deletions(-)
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diff --git a/arch/x86/include/asm/barrier.h b/arch/x86/include/asm/barrier.h
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index aae78054cae2..d00432579444 100644
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--- a/arch/x86/include/asm/barrier.h
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+++ b/arch/x86/include/asm/barrier.h
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@@ -23,8 +23,7 @@
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#define wmb() asm volatile("sfence" ::: "memory")
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#endif
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-#define gmb() alternative_2("", "mfence", X86_FEATURE_MFENCE_RDTSC, \
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- "lfence", X86_FEATURE_LFENCE_RDTSC);
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+#define gmb() alternative("", "lfence", X86_FEATURE_LFENCE_RDTSC);
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#ifdef CONFIG_X86_PPRO_FENCE
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#define dma_rmb() rmb()
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diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
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index 898dba2e2e2c..3139098269f6 100644
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--- a/arch/x86/include/asm/msr.h
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+++ b/arch/x86/include/asm/msr.h
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@@ -213,8 +213,7 @@ static __always_inline unsigned long long rdtsc_ordered(void)
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* that some other imaginary CPU is updating continuously with a
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* time stamp.
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*/
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- alternative_2("", "mfence", X86_FEATURE_MFENCE_RDTSC,
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- "lfence", X86_FEATURE_LFENCE_RDTSC);
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+ alternative("", "lfence", X86_FEATURE_LFENCE_RDTSC);
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return rdtsc();
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}
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diff --git a/arch/x86/net/bpf_jit_comp.c b/arch/x86/net/bpf_jit_comp.c
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index 879dbfefb66d..e20e304320f9 100644
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--- a/arch/x86/net/bpf_jit_comp.c
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+++ b/arch/x86/net/bpf_jit_comp.c
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@@ -116,9 +116,6 @@ static void emit_memory_barrier(u8 **pprog)
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if (boot_cpu_has(X86_FEATURE_LFENCE_RDTSC))
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/* x86 LFENCE opcode 0F AE E8 */
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EMIT3(0x0f, 0xae, 0xe8);
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- else if (boot_cpu_has(X86_FEATURE_MFENCE_RDTSC))
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- /* AMD MFENCE opcode 0F AE F0 */
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- EMIT3(0x0f, 0xae, 0xf0);
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else
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/* we should never end up here,
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* but if we do, better not to emit anything*/
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--
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2.14.2
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