From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, David Woodhouse <dwmw@amazon.co.uk>,
Thomas Gleixner <tglx@linutronix.de>,
Borislav Petkov <bp@suse.de>, Dave Hansen <dave.hansen@intel.com>,
gnomes@lxorguk.ukuu.org.uk, ak@linux.intel.com,
ashok.raj@intel.com, karahmed@amazon.de, arjan@linux.intel.com,
torvalds@linux-foundation.org, peterz@infradead.org,
bp@alien8.de, pbonzini@redhat.com, tim.c.chen@linux.intel.com,
"Srivatsa S. Bhat" <srivatsa@csail.mit.edu>,
"Matt Helsley (VMware)" <matt.helsley@gmail.com>,
Alexey Makhalov <amakhalov@vmware.com>, Bo Gan <ganb@vmware.com>,
gregkh@linux-foundation.org
Subject: [PATCH 4.4 023/107] x86/pti: Do not enable PTI on CPUs which are not vulnerable to Meltdown
Date: Mon, 23 Jul 2018 14:41:17 +0200 [thread overview]
Message-ID: <20180723122414.022165652@linuxfoundation.org> (raw)
In-Reply-To: <20180723122413.003644357@linuxfoundation.org>
4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: David Woodhouse <dwmw@amazon.co.uk>
(cherry picked from commit fec9434a12f38d3aeafeb75711b71d8a1fdef621)
Also, for CPUs which don't speculate at all, don't report that they're
vulnerable to the Spectre variants either.
Leave the cpu_no_meltdown[] match table with just X86_VENDOR_AMD in it
for now, even though that could be done with a simple comparison, on the
assumption that we'll have more to add.
Based on suggestions from Dave Hansen and Alan Cox.
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Acked-by: Dave Hansen <dave.hansen@intel.com>
Cc: gnomes@lxorguk.ukuu.org.uk
Cc: ak@linux.intel.com
Cc: ashok.raj@intel.com
Cc: karahmed@amazon.de
Cc: arjan@linux.intel.com
Cc: torvalds@linux-foundation.org
Cc: peterz@infradead.org
Cc: bp@alien8.de
Cc: pbonzini@redhat.com
Cc: tim.c.chen@linux.intel.com
Cc: gregkh@linux-foundation.org
Link: https://lkml.kernel.org/r/1516896855-7642-6-git-send-email-dwmw@amazon.co.uk
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Srivatsa S. Bhat <srivatsa@csail.mit.edu>
Reviewed-by: Matt Helsley (VMware) <matt.helsley@gmail.com>
Reviewed-by: Alexey Makhalov <amakhalov@vmware.com>
Reviewed-by: Bo Gan <ganb@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/x86/kernel/cpu/common.c | 48 ++++++++++++++++++++++++++++++++++++++-----
1 file changed, 43 insertions(+), 5 deletions(-)
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -43,6 +43,8 @@
#include <asm/pat.h>
#include <asm/microcode.h>
#include <asm/microcode_intel.h>
+#include <asm/intel-family.h>
+#include <asm/cpu_device_id.h>
#ifdef CONFIG_X86_LOCAL_APIC
#include <asm/uv/uv.h>
@@ -794,6 +796,41 @@ static void identify_cpu_without_cpuid(s
#endif
}
+static const __initdata struct x86_cpu_id cpu_no_speculation[] = {
+ { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_CEDARVIEW, X86_FEATURE_ANY },
+ { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_CLOVERVIEW, X86_FEATURE_ANY },
+ { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_LINCROFT, X86_FEATURE_ANY },
+ { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_PENWELL, X86_FEATURE_ANY },
+ { X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_PINEVIEW, X86_FEATURE_ANY },
+ { X86_VENDOR_CENTAUR, 5 },
+ { X86_VENDOR_INTEL, 5 },
+ { X86_VENDOR_NSC, 5 },
+ { X86_VENDOR_ANY, 4 },
+ {}
+};
+
+static const __initdata struct x86_cpu_id cpu_no_meltdown[] = {
+ { X86_VENDOR_AMD },
+ {}
+};
+
+static bool __init cpu_vulnerable_to_meltdown(struct cpuinfo_x86 *c)
+{
+ u64 ia32_cap = 0;
+
+ if (x86_match_cpu(cpu_no_meltdown))
+ return false;
+
+ if (cpu_has(c, X86_FEATURE_ARCH_CAPABILITIES))
+ rdmsrl(MSR_IA32_ARCH_CAPABILITIES, ia32_cap);
+
+ /* Rogue Data Cache Load? No! */
+ if (ia32_cap & ARCH_CAP_RDCL_NO)
+ return false;
+
+ return true;
+}
+
/*
* Do minimum CPU detection early.
* Fields really needed: vendor, cpuid_level, family, model, mask,
@@ -840,11 +877,12 @@ static void __init early_identify_cpu(st
setup_force_cpu_cap(X86_FEATURE_ALWAYS);
- if (c->x86_vendor != X86_VENDOR_AMD)
- setup_force_cpu_bug(X86_BUG_CPU_MELTDOWN);
-
- setup_force_cpu_bug(X86_BUG_SPECTRE_V1);
- setup_force_cpu_bug(X86_BUG_SPECTRE_V2);
+ if (!x86_match_cpu(cpu_no_speculation)) {
+ if (cpu_vulnerable_to_meltdown(c))
+ setup_force_cpu_bug(X86_BUG_CPU_MELTDOWN);
+ setup_force_cpu_bug(X86_BUG_SPECTRE_V1);
+ setup_force_cpu_bug(X86_BUG_SPECTRE_V2);
+ }
fpu__init_system(c);
next prev parent reply other threads:[~2018-07-23 12:46 UTC|newest]
Thread overview: 111+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-23 12:40 [PATCH 4.4 000/107] 4.4.144-stable review Greg Kroah-Hartman
2018-07-23 12:40 ` [PATCH 4.4 002/107] x86/MCE: Remove min interval polling limitation Greg Kroah-Hartman
2018-07-23 12:40 ` [PATCH 4.4 003/107] fat: fix memory allocation failure handling of match_strdup() Greg Kroah-Hartman
2018-07-23 12:40 ` [PATCH 4.4 004/107] ALSA: rawmidi: Change resized buffers atomically Greg Kroah-Hartman
2018-07-23 12:40 ` [PATCH 4.4 005/107] ARC: Fix CONFIG_SWAP Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 006/107] ARC: mm: allow mprotect to make stack mappings executable Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 007/107] mm: memcg: fix use after free in mem_cgroup_iter() Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 008/107] ipv4: Return EINVAL when ping_group_range sysctl doesnt map to user ns Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 009/107] ipv6: fix useless rol32 call on hash Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 010/107] lib/rhashtable: consider param->min_size when setting initial table size Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 011/107] net/ipv4: Set oif in fib_compute_spec_dst Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 012/107] net: phy: fix flag masking in __set_phy_supported Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 013/107] ptp: fix missing break in switch Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 014/107] tg3: Add higher cpu clock for 5762 Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 015/107] net: Dont copy pfmemalloc flag in __copy_skb_header() Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 016/107] skbuff: Unconditionally copy pfmemalloc in __skb_clone() Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 017/107] xhci: Fix perceived dead host due to runtime suspend race with event handler Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 018/107] x86/paravirt: Make native_save_fl() extern inline Greg Kroah-Hartman
2018-08-24 23:08 ` Ben Hutchings
2018-08-27 21:06 ` Nick Desaulniers
2018-07-23 12:41 ` [PATCH 4.4 019/107] x86/cpufeatures: Add CPUID_7_EDX CPUID leaf Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 020/107] x86/cpufeatures: Add Intel feature bits for Speculation Control Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 021/107] x86/cpufeatures: Add AMD " Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 022/107] x86/msr: Add definitions for new speculation control MSRs Greg Kroah-Hartman
2018-07-23 12:41 ` Greg Kroah-Hartman [this message]
2018-07-23 12:41 ` [PATCH 4.4 024/107] x86/cpufeature: Blacklist SPEC_CTRL/PRED_CMD on early Spectre v2 microcodes Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 025/107] x86/speculation: Add basic IBPB (Indirect Branch Prediction Barrier) support Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 026/107] x86/cpufeatures: Clean up Spectre v2 related CPUID flags Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 027/107] x86/cpuid: Fix up "virtual" IBRS/IBPB/STIBP feature bits on Intel Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 028/107] x86/pti: Mark constant arrays as __initconst Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 029/107] x86/asm/entry/32: Simplify pushes of zeroed pt_regs->REGs Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 030/107] x86/entry/64/compat: Clear registers for compat syscalls, to reduce speculation attack surface Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 031/107] x86/speculation: Update Speculation Control microcode blacklist Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 032/107] x86/speculation: Correct Speculation Control microcode blacklist again Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 033/107] x86/speculation: Clean up various Spectre related details Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 034/107] x86/speculation: Fix up array_index_nospec_mask() asm constraint Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 035/107] x86/speculation: Add <asm/msr-index.h> dependency Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 036/107] x86/xen: Zero MSR_IA32_SPEC_CTRL before suspend Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 037/107] x86/mm: Factor out LDT init from context init Greg Kroah-Hartman
2018-08-24 23:44 ` Ben Hutchings
2018-08-26 6:06 ` Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 038/107] x86/mm: Give each mm TLB flush generation a unique ID Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 041/107] x86/speculation: Use IBRS if available before calling into firmware Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 042/107] x86/speculation: Move firmware_restrict_branch_speculation_*() from C to CPP Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 043/107] x86/speculation: Remove Skylake C2 from Speculation Control microcode blacklist Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 046/107] xen: set cpu capabilities from xen_start_kernel() Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 047/107] x86/amd: dont set X86_BUG_SYSRET_SS_ATTRS when running under Xen Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 048/107] x86/nospec: Simplify alternative_msr_write() Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 049/107] x86/bugs: Concentrate bug detection into a separate function Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 050/107] x86/bugs: Concentrate bug reporting " Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 051/107] x86/bugs: Read SPEC_CTRL MSR during boot and re-use reserved bits Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 052/107] x86/bugs, KVM: Support the combination of guest and host IBRS Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 053/107] x86/cpu: Rename Merrifield2 to Moorefield Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 054/107] x86/cpu/intel: Add Knights Mill to Intel family Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 055/107] x86/bugs: Expose /sys/../spec_store_bypass Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 056/107] x86/cpufeatures: Add X86_FEATURE_RDS Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 057/107] x86/bugs: Provide boot parameters for the spec_store_bypass_disable mitigation Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 058/107] x86/bugs/intel: Set proper CPU features and setup RDS Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 059/107] x86/bugs: Whitelist allowed SPEC_CTRL MSR values Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 060/107] x86/bugs/AMD: Add support to disable RDS on Fam[15, 16, 17]h if requested Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 061/107] x86/speculation: Create spec-ctrl.h to avoid include hell Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 062/107] prctl: Add speculation control prctls Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 063/107] x86/process: Optimize TIF checks in __switch_to_xtra() Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 064/107] x86/process: Correct and optimize TIF_BLOCKSTEP switch Greg Kroah-Hartman
2018-07-23 12:41 ` [PATCH 4.4 065/107] x86/process: Optimize TIF_NOTSC switch Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 066/107] x86/process: Allow runtime control of Speculative Store Bypass Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 067/107] x86/speculation: Add prctl for Speculative Store Bypass mitigation Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 068/107] nospec: Allow getting/setting on non-current task Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 069/107] proc: Provide details on speculation flaw mitigations Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 070/107] seccomp: Enable " Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 071/107] prctl: Add force disable speculation Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 072/107] seccomp: Use PR_SPEC_FORCE_DISABLE Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 073/107] seccomp: Add filter flag to opt-out of SSB mitigation Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 074/107] seccomp: Move speculation migitation control to arch code Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 075/107] x86/speculation: Make "seccomp" the default mode for Speculative Store Bypass Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 076/107] x86/bugs: Rename _RDS to _SSBD Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 077/107] proc: Use underscores for SSBD in status Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 078/107] Documentation/spec_ctrl: Do some minor cleanups Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 079/107] x86/bugs: Fix __ssb_select_mitigation() return type Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 080/107] x86/bugs: Make cpu_show_common() static Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 081/107] x86/bugs: Fix the parameters alignment and missing void Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 082/107] x86/cpu: Make alternative_msr_write work for 32-bit code Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 084/107] x86/cpufeatures: Disentangle MSR_SPEC_CTRL enumeration from IBRS Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 085/107] x86/cpufeatures: Disentangle SSBD enumeration Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 086/107] x86/cpu/AMD: Fix erratum 1076 (CPB bit) Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 087/107] x86/cpufeatures: Add FEATURE_ZEN Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 088/107] x86/speculation: Handle HT correctly on AMD Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 089/107] x86/bugs, KVM: Extend speculation control for VIRT_SPEC_CTRL Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 090/107] x86/speculation: Add virtualized speculative store bypass disable support Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 091/107] x86/speculation: Rework speculative_store_bypass_update() Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 092/107] x86/bugs: Unify x86_spec_ctrl_{set_guest, restore_host} Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 093/107] x86/bugs: Expose x86_spec_ctrl_base directly Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 094/107] x86/bugs: Remove x86_spec_ctrl_set() Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 095/107] x86/bugs: Rework spec_ctrl base and mask logic Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 096/107] x86/speculation, KVM: Implement support for VIRT_SPEC_CTRL/LS_CFG Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 097/107] x86/bugs: Rename SSBD_NO to SSB_NO Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 098/107] x86/xen: Add call of speculative_store_bypass_ht_init() to PV paths Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 099/107] x86/cpu: Re-apply forced caps every time CPU caps are re-read Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 100/107] block: do not use interruptible wait anywhere Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 101/107] clk: tegra: Fix PLL_U post divider and initial rate on Tegra30 Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 102/107] ubi: Introduce vol_ignored() Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 103/107] ubi: Rework Fastmap attach base code Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 104/107] ubi: Be more paranoid while seaching for the most recent Fastmap Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 105/107] ubi: Fix races around ubi_refill_pools() Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 106/107] ubi: Fix Fastmaps update_vol() Greg Kroah-Hartman
2018-07-23 12:42 ` [PATCH 4.4 107/107] ubi: fastmap: Erase outdated anchor PEBs during attach Greg Kroah-Hartman
2018-09-04 18:39 ` Ben Hutchings
2018-09-17 11:53 ` Greg Kroah-Hartman
2018-07-23 15:11 ` [PATCH 4.4 000/107] 4.4.144-stable review Nathan Chancellor
2018-07-23 22:14 ` Dan Rue
2018-07-24 15:57 ` Guenter Roeck
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