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From: Ben Hutchings <ben@decadent.org.uk>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: akpm@linux-foundation.org, Denis Kirjanov <kda@linux-powerpc.org>,
	"Borislav Petkov" <bp@suse.de>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Jon Masters" <jcm@redhat.com>,
	"Linus Torvalds" <torvalds@linux-foundation.org>,
	"Frederic Weisbecker" <frederic@kernel.org>
Subject: [PATCH 3.16 62/86] x86/speculation: Consolidate CPU whitelists
Date: Thu, 16 May 2019 16:55:33 +0100	[thread overview]
Message-ID: <lsq.1558022133.767838303@decadent.org.uk> (raw)
In-Reply-To: <lsq.1558022132.52852998@decadent.org.uk>

3.16.68-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Thomas Gleixner <tglx@linutronix.de>

commit 36ad35131adacc29b328b9c8b6277a8bf0d6fd5d upstream.

The CPU vulnerability whitelists have some overlap and there are more
whitelists coming along.

Use the driver_data field in the x86_cpu_id struct to denote the
whitelisted vulnerabilities and combine all whitelists into one.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Jon Masters <jcm@redhat.com>
Tested-by: Jon Masters <jcm@redhat.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 arch/x86/kernel/cpu/common.c | 105 +++++++++++++++++++----------------
 1 file changed, 56 insertions(+), 49 deletions(-)

--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -807,60 +807,68 @@ static void identify_cpu_without_cpuid(s
 #endif
 }
 
-static const __initconst struct x86_cpu_id cpu_no_speculation[] = {
-	{ X86_VENDOR_INTEL,	6, INTEL_FAM6_ATOM_SALTWELL,	X86_FEATURE_ANY },
-	{ X86_VENDOR_INTEL,	6, INTEL_FAM6_ATOM_SALTWELL_TABLET,	X86_FEATURE_ANY },
-	{ X86_VENDOR_INTEL,	6, INTEL_FAM6_ATOM_BONNELL_MID,	X86_FEATURE_ANY },
-	{ X86_VENDOR_INTEL,	6, INTEL_FAM6_ATOM_SALTWELL_MID,	X86_FEATURE_ANY },
-	{ X86_VENDOR_INTEL,	6, INTEL_FAM6_ATOM_BONNELL,	X86_FEATURE_ANY },
-	{ X86_VENDOR_CENTAUR,	5 },
-	{ X86_VENDOR_INTEL,	5 },
-	{ X86_VENDOR_NSC,	5 },
-	{ X86_VENDOR_ANY,	4 },
-	{}
-};
+#define NO_SPECULATION	BIT(0)
+#define NO_MELTDOWN	BIT(1)
+#define NO_SSB		BIT(2)
+#define NO_L1TF		BIT(3)
+
+#define VULNWL(_vendor, _family, _model, _whitelist)	\
+	{ X86_VENDOR_##_vendor, _family, _model, X86_FEATURE_ANY, _whitelist }
+
+#define VULNWL_INTEL(model, whitelist)		\
+	VULNWL(INTEL, 6, INTEL_FAM6_##model, whitelist)
+
+#define VULNWL_AMD(family, whitelist)		\
+	VULNWL(AMD, family, X86_MODEL_ANY, whitelist)
+
+static const __initconst struct x86_cpu_id cpu_vuln_whitelist[] = {
+	VULNWL(ANY,	4, X86_MODEL_ANY,	NO_SPECULATION),
+	VULNWL(CENTAUR,	5, X86_MODEL_ANY,	NO_SPECULATION),
+	VULNWL(INTEL,	5, X86_MODEL_ANY,	NO_SPECULATION),
+	VULNWL(NSC,	5, X86_MODEL_ANY,	NO_SPECULATION),
+
+	VULNWL_INTEL(ATOM_SALTWELL,		NO_SPECULATION),
+	VULNWL_INTEL(ATOM_SALTWELL_TABLET,	NO_SPECULATION),
+	VULNWL_INTEL(ATOM_SALTWELL_MID,		NO_SPECULATION),
+	VULNWL_INTEL(ATOM_BONNELL,		NO_SPECULATION),
+	VULNWL_INTEL(ATOM_BONNELL_MID,		NO_SPECULATION),
+
+	VULNWL_INTEL(ATOM_SILVERMONT,		NO_SSB | NO_L1TF),
+	VULNWL_INTEL(ATOM_SILVERMONT_X,		NO_SSB | NO_L1TF),
+	VULNWL_INTEL(ATOM_SILVERMONT_MID,	NO_SSB | NO_L1TF),
+	VULNWL_INTEL(ATOM_AIRMONT,		NO_SSB | NO_L1TF),
+	VULNWL_INTEL(XEON_PHI_KNL,		NO_SSB | NO_L1TF),
+	VULNWL_INTEL(XEON_PHI_KNM,		NO_SSB | NO_L1TF),
+
+	VULNWL_INTEL(CORE_YONAH,		NO_SSB),
+
+	VULNWL_INTEL(ATOM_AIRMONT_MID,		NO_L1TF),
+	VULNWL_INTEL(ATOM_GOLDMONT,		NO_L1TF),
+	VULNWL_INTEL(ATOM_GOLDMONT_X,		NO_L1TF),
+	VULNWL_INTEL(ATOM_GOLDMONT_PLUS,	NO_L1TF),
+
+	VULNWL_AMD(0x0f,		NO_MELTDOWN | NO_SSB | NO_L1TF),
+	VULNWL_AMD(0x10,		NO_MELTDOWN | NO_SSB | NO_L1TF),
+	VULNWL_AMD(0x11,		NO_MELTDOWN | NO_SSB | NO_L1TF),
+	VULNWL_AMD(0x12,		NO_MELTDOWN | NO_SSB | NO_L1TF),
 
-static const __initconst struct x86_cpu_id cpu_no_meltdown[] = {
-	{ X86_VENDOR_AMD },
+	/* FAMILY_ANY must be last, otherwise 0x0f - 0x12 matches won't work */
+	VULNWL_AMD(X86_FAMILY_ANY,	NO_MELTDOWN | NO_L1TF),
 	{}
 };
 
-/* Only list CPUs which speculate but are non susceptible to SSB */
-static const __initconst struct x86_cpu_id cpu_no_spec_store_bypass[] = {
-	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_SILVERMONT	},
-	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_AIRMONT		},
-	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_SILVERMONT_X	},
-	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_SILVERMONT_MID	},
-	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_CORE_YONAH		},
-	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_XEON_PHI_KNL		},
-	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_XEON_PHI_KNM		},
-	{ X86_VENDOR_AMD,	0x12,					},
-	{ X86_VENDOR_AMD,	0x11,					},
-	{ X86_VENDOR_AMD,	0x10,					},
-	{ X86_VENDOR_AMD,	0xf,					},
-	{}
-};
+static bool __init cpu_matches(unsigned long which)
+{
+	const struct x86_cpu_id *m = x86_match_cpu(cpu_vuln_whitelist);
 
-static const __initconst struct x86_cpu_id cpu_no_l1tf[] = {
-	/* in addition to cpu_no_speculation */
-	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_SILVERMONT	},
-	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_SILVERMONT_X	},
-	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_AIRMONT		},
-	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_SILVERMONT_MID	},
-	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_AIRMONT_MID	},
-	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_GOLDMONT	},
-	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_GOLDMONT_X	},
-	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_ATOM_GOLDMONT_PLUS	},
-	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_XEON_PHI_KNL		},
-	{ X86_VENDOR_INTEL,	6,	INTEL_FAM6_XEON_PHI_KNM		},
-	{}
-};
+	return m && !!(m->driver_data & which);
+}
 
 static void __init cpu_set_bug_bits(struct cpuinfo_x86 *c)
 {
 	u64 ia32_cap = 0;
 
-	if (x86_match_cpu(cpu_no_speculation))
+	if (cpu_matches(NO_SPECULATION))
 		return;
 
 	setup_force_cpu_bug(X86_BUG_SPECTRE_V1);
@@ -869,15 +877,14 @@ static void __init cpu_set_bug_bits(stru
 	if (cpu_has(c, X86_FEATURE_ARCH_CAPABILITIES))
 		rdmsrl(MSR_IA32_ARCH_CAPABILITIES, ia32_cap);
 
-	if (!x86_match_cpu(cpu_no_spec_store_bypass) &&
-	   !(ia32_cap & ARCH_CAP_SSB_NO) &&
+	if (!cpu_matches(NO_SSB) && !(ia32_cap & ARCH_CAP_SSB_NO) &&
 	   !cpu_has(c, X86_FEATURE_AMD_SSB_NO))
 		setup_force_cpu_bug(X86_BUG_SPEC_STORE_BYPASS);
 
 	if (ia32_cap & ARCH_CAP_IBRS_ALL)
 		setup_force_cpu_cap(X86_FEATURE_IBRS_ENHANCED);
 
-	if (x86_match_cpu(cpu_no_meltdown))
+	if (cpu_matches(NO_MELTDOWN))
 		return;
 
 	/* Rogue Data Cache Load? No! */
@@ -886,7 +893,7 @@ static void __init cpu_set_bug_bits(stru
 
 	setup_force_cpu_bug(X86_BUG_CPU_MELTDOWN);
 
-	if (x86_match_cpu(cpu_no_l1tf))
+	if (cpu_matches(NO_L1TF))
 		return;
 
 	setup_force_cpu_bug(X86_BUG_L1TF);


  parent reply	other threads:[~2019-05-16 16:03 UTC|newest]

Thread overview: 87+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-16 15:55 [PATCH 3.16 00/86] 3.16.68-rc1 review Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 04/86] MIPS: jump_label.c: Correct the span of the J instruction Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 01/86] x86/cpufeature: Add bug flags to /proc/cpuinfo Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 08/86] jump_label: Allow asm/jump_label.h to be included in assembly Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 07/86] s390/jump label: use different nop instruction Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 10/86] module, jump_label: Fix module locking Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 02/86] module: add within_module() function Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 03/86] jump_label: Fix small typos in the documentation Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 09/86] jump_label: Allow jump labels to be used in assembly Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 05/86] MIPS: jump_label.c: Handle the microMIPS J instruction encoding Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 06/86] s390/jump label: add sanity checks Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 75/86] x86/speculation: Move arch_smt_update() call to after mitigation decisions Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 43/86] x86/speculation: Rework SMT state change Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 78/86] x86/speculation/mds: Print SMT vulnerable on MSBDS with mitigations off Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 68/86] x86/speculation/mds: Conditionally clear CPU buffers on idle entry Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 32/86] x86/speculation: Enable cross-hyperthread spectre v2 STIBP mitigation Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 63/86] x86/speculation/mds: Add basic bug infrastructure for MDS Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 34/86] x86/speculation: Update the TIF_SSBD comment Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 64/86] x86/speculation/mds: Add BUG_MSBDS_ONLY Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 79/86] cpu/speculation: Add 'mitigations=' cmdline option Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 66/86] x86/speculation/mds: Add mds_clear_cpu_buffers() Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 76/86] x86/speculation/mds: Add SMT warning message Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 21/86] x86/asm: Error out if asm/jump_label.h is included inappropriately Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 51/86] x86/speculation: Avoid __switch_to_xtra() calls Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 45/86] x86/speculation: Mark string arrays const correctly Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 41/86] x86/Kconfig: Select SCHED_SMT if SMP enabled Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 14/86] locking/static_keys: Rework update logic Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 77/86] x86/speculation/mds: Fix comment Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 27/86] x86/speculation: Support Enhanced IBRS on future CPUs Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 38/86] x86/speculation: Disable STIBP when enhanced IBRS is in use Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 31/86] x86/speculation: Apply IBPB more strictly to avoid cross-process data leak Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 33/86] x86/speculation: Propagate information about RSB filling mitigation to sysfs Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 70/86] x86/speculation/l1tf: Document l1tf in sysfs Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 16/86] jump label, locking/static_keys: Update docs Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 81/86] x86/speculation/mds: Add 'mitigations=' support for MDS Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 44/86] x86/speculation: Reorder the spec_v2 code Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 60/86] kvm: x86: Report STIBP on GET_SUPPORTED_CPUID Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 35/86] x86/speculation: Clean up spectre_v2_parse_cmdline() Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 18/86] locking/static_keys: Fix a silly typo Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 80/86] x86/speculation: Support 'mitigations=' cmdline option Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 40/86] x86/speculation: Reorganize speculation control MSRs update Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 30/86] x86/cpu: Sanitize FAM6_ATOM naming Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 58/86] x86/speculation: Add seccomp Spectre v2 user space protection mode Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 39/86] x86/speculation: Rename SSBD update functions Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 50/86] x86/process: Consolidate and simplify switch_to_xtra() code Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 37/86] x86/speculation: Move STIPB/IBPB string conditionals out of cpu_show_common() Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 82/86] x86/mds: Add MDSUM variant to the MDS documentation Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 36/86] x86/speculation: Remove unnecessary ret variable in cpu_show_common() Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 52/86] x86/speculation: Prepare for conditional IBPB in switch_mm() Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 54/86] x86/speculation: Prepare arch_smt_update() for PRCTL mode Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 69/86] x86/speculation/mds: Add mitigation control for MDS Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 28/86] x86/speculation: Simplify the CPU bug detection logic Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 71/86] x86/speculation/mds: Add sysfs reporting for MDS Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 57/86] x86/speculation: Enable prctl mode for spectre_v2_user Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 86/86] x86/bugs: Change L1TF mitigation string to match upstream Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 59/86] x86/speculation: Provide IBPB always command line options Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 48/86] x86/speculation: Add command line control for indirect branch speculation Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 83/86] Documentation: Correct the possible MDS sysfs values Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 23/86] x86/headers: Don't include asm/processor.h in asm/atomic.h Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 22/86] x86/asm: Add asm macros for static keys/jump labels Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 29/86] x86/speculation: Remove SPECTRE_V2_IBRS in enum spectre_v2_mitigation Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 74/86] Documentation: Add MDS vulnerability documentation Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 24/86] x86/cpufeature: Carve out X86_FEATURE_* Ben Hutchings
2019-05-16 15:55 ` Ben Hutchings [this message]
2019-05-16 15:55 ` [PATCH 3.16 73/86] Documentation: Move L1TF to separate directory Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 19/86] locking/static_keys: Fix up the static keys documentation Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 15/86] locking/static_keys: Add a new static_key interface Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 49/86] x86/speculation: Prepare for per task indirect branch speculation control Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 46/86] x86/speculataion: Mark command line parser data __initdata Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 53/86] x86/speculation: Split out TIF update Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 11/86] jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP} Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 85/86] x86/cpu/bugs: Use __initconst for 'const' init data Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 13/86] jump_label: Add jump_entry_key() helper Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 61/86] x86/msr-index: Cleanup bit defines Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 55/86] x86/speculation: Prevent stale SPEC_CTRL msr content Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 84/86] x86/speculation/mds: Fix documentation typo Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 67/86] x86/speculation/mds: Clear CPU buffers on exit to user Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 65/86] x86/kvm: Expose X86_FEATURE_MD_CLEAR to guests Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 56/86] x86/speculation: Add prctl() control for indirect branch speculation Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 12/86] jump_label, locking/static_keys: Rename JUMP_LABEL_TYPE_* and related helpers to the static_key* pattern Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 47/86] x86/speculation: Unify conditional spectre v2 print functions Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 26/86] locking/static_keys: Provide DECLARE and well as DEFINE macros Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 25/86] locking/static_key: Fix concurrent static_key_slow_inc() Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 17/86] jump_label/x86: Work around asm build bug on older/backported GCCs Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 20/86] jump_label: make static_key_enabled() work on static_key_true/false types too Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 72/86] x86/speculation/mds: Add mitigation mode VMWERV Ben Hutchings
2019-05-16 15:55 ` [PATCH 3.16 42/86] sched: Add sched_smt_active() Ben Hutchings

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