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[PATCH PATCH v2 8/9] x86/bugs: Declutter vulnerable CPU list

Pawan Gupta posted 9 patches 1 year, 7 months ago
There is a newer version of this series
[PATCH PATCH v2 8/9] x86/bugs: Declutter vulnerable CPU list
Posted by Pawan Gupta 1 year, 7 months ago 
The affected processor table has a lot of repetition and redundant
information that can be omitted. For example:

  VULNBL_INTEL_STEPPINGS(INTEL_IVYBRIDGE,		X86_STEPPING_ANY,		SRBDS),

can easily be simplified to:

  VULNBL_INTEL(IVYBRIDGE,	SRBDS),

Apply this to all the entries in the affected processor table.

No functional change. Disassembly of arch/x86/kernel/cpu/common.o does not
show any difference before and after the change.

Signed-off-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
---
 arch/x86/kernel/cpu/common.c | 133 ++++++++++++++++++++++---------------------
 1 file changed, 69 insertions(+), 64 deletions(-)

diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index d4e539d4e158..7e5cd14e509f 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1128,7 +1128,7 @@ static void identify_cpu_without_cpuid(struct cpuinfo_x86 *c)
 	X86_MATCH_VENDOR_FAM_MODEL(vendor, family, model, whitelist)
 
 #define VULNWL_INTEL(vfm, whitelist)		\
-	X86_MATCH_VFM(vfm, whitelist)
+	X86_MATCH_VFM(INTEL_##vfm, whitelist)
 
 #define VULNWL_AMD(family, whitelist)		\
 	VULNWL(AMD, family, X86_MODEL_ANY, whitelist)
@@ -1145,32 +1145,32 @@ static const __initconst struct x86_cpu_id cpu_vuln_whitelist[] = {
 	VULNWL(VORTEX,	6, X86_MODEL_ANY,	NO_SPECULATION),
 
 	/* Intel Family 6 */
-	VULNWL_INTEL(INTEL_TIGERLAKE,		NO_MMIO),
-	VULNWL_INTEL(INTEL_TIGERLAKE_L,		NO_MMIO),
-	VULNWL_INTEL(INTEL_ALDERLAKE,		NO_MMIO),
-	VULNWL_INTEL(INTEL_ALDERLAKE_L,		NO_MMIO),
+	VULNWL_INTEL(TIGERLAKE,			NO_MMIO),
+	VULNWL_INTEL(TIGERLAKE_L,		NO_MMIO),
+	VULNWL_INTEL(ALDERLAKE,			NO_MMIO),
+	VULNWL_INTEL(ALDERLAKE_L,		NO_MMIO),
 
-	VULNWL_INTEL(INTEL_ATOM_SALTWELL,	NO_SPECULATION | NO_ITLB_MULTIHIT),
-	VULNWL_INTEL(INTEL_ATOM_SALTWELL_TABLET, NO_SPECULATION | NO_ITLB_MULTIHIT),
-	VULNWL_INTEL(INTEL_ATOM_SALTWELL_MID,	NO_SPECULATION | NO_ITLB_MULTIHIT),
-	VULNWL_INTEL(INTEL_ATOM_BONNELL,	NO_SPECULATION | NO_ITLB_MULTIHIT),
-	VULNWL_INTEL(INTEL_ATOM_BONNELL_MID,	NO_SPECULATION | NO_ITLB_MULTIHIT),
+	VULNWL_INTEL(ATOM_SALTWELL,		NO_SPECULATION | NO_ITLB_MULTIHIT),
+	VULNWL_INTEL(ATOM_SALTWELL_TABLET,	NO_SPECULATION | NO_ITLB_MULTIHIT),
+	VULNWL_INTEL(ATOM_SALTWELL_MID,		NO_SPECULATION | NO_ITLB_MULTIHIT),
+	VULNWL_INTEL(ATOM_BONNELL,		NO_SPECULATION | NO_ITLB_MULTIHIT),
+	VULNWL_INTEL(ATOM_BONNELL_MID,		NO_SPECULATION | NO_ITLB_MULTIHIT),
 
-	VULNWL_INTEL(INTEL_ATOM_SILVERMONT,	NO_SSB | NO_L1TF | MSBDS_ONLY | NO_SWAPGS | NO_ITLB_MULTIHIT),
-	VULNWL_INTEL(INTEL_ATOM_SILVERMONT_D,	NO_SSB | NO_L1TF | MSBDS_ONLY | NO_SWAPGS | NO_ITLB_MULTIHIT),
-	VULNWL_INTEL(INTEL_ATOM_SILVERMONT_MID,	NO_SSB | NO_L1TF | MSBDS_ONLY | NO_SWAPGS | NO_ITLB_MULTIHIT),
-	VULNWL_INTEL(INTEL_ATOM_AIRMONT,	NO_SSB | NO_L1TF | MSBDS_ONLY | NO_SWAPGS | NO_ITLB_MULTIHIT),
-	VULNWL_INTEL(INTEL_XEON_PHI_KNL,	NO_SSB | NO_L1TF | MSBDS_ONLY | NO_SWAPGS | NO_ITLB_MULTIHIT),
-	VULNWL_INTEL(INTEL_XEON_PHI_KNM,	NO_SSB | NO_L1TF | MSBDS_ONLY | NO_SWAPGS | NO_ITLB_MULTIHIT),
+	VULNWL_INTEL(ATOM_SILVERMONT,		NO_SSB | NO_L1TF | MSBDS_ONLY | NO_SWAPGS | NO_ITLB_MULTIHIT),
+	VULNWL_INTEL(ATOM_SILVERMONT_D,		NO_SSB | NO_L1TF | MSBDS_ONLY | NO_SWAPGS | NO_ITLB_MULTIHIT),
+	VULNWL_INTEL(ATOM_SILVERMONT_MID,	NO_SSB | NO_L1TF | MSBDS_ONLY | NO_SWAPGS | NO_ITLB_MULTIHIT),
+	VULNWL_INTEL(ATOM_AIRMONT,		NO_SSB | NO_L1TF | MSBDS_ONLY | NO_SWAPGS | NO_ITLB_MULTIHIT),
+	VULNWL_INTEL(XEON_PHI_KNL,		NO_SSB | NO_L1TF | MSBDS_ONLY | NO_SWAPGS | NO_ITLB_MULTIHIT),
+	VULNWL_INTEL(XEON_PHI_KNM,		NO_SSB | NO_L1TF | MSBDS_ONLY | NO_SWAPGS | NO_ITLB_MULTIHIT),
 
-	VULNWL_INTEL(INTEL_CORE_YONAH,		NO_SSB),
+	VULNWL_INTEL(CORE_YONAH,		NO_SSB),
 
-	VULNWL_INTEL(INTEL_ATOM_AIRMONT_MID,	NO_L1TF | MSBDS_ONLY | NO_SWAPGS | NO_ITLB_MULTIHIT),
-	VULNWL_INTEL(INTEL_ATOM_AIRMONT_NP,	NO_L1TF | NO_SWAPGS | NO_ITLB_MULTIHIT),
+	VULNWL_INTEL(ATOM_AIRMONT_MID,		NO_L1TF | MSBDS_ONLY | NO_SWAPGS | NO_ITLB_MULTIHIT),
+	VULNWL_INTEL(ATOM_AIRMONT_NP,		NO_L1TF | NO_SWAPGS | NO_ITLB_MULTIHIT),
 
-	VULNWL_INTEL(INTEL_ATOM_GOLDMONT,	NO_MDS | NO_L1TF | NO_SWAPGS | NO_ITLB_MULTIHIT | NO_MMIO),
-	VULNWL_INTEL(INTEL_ATOM_GOLDMONT_D,	NO_MDS | NO_L1TF | NO_SWAPGS | NO_ITLB_MULTIHIT | NO_MMIO),
-	VULNWL_INTEL(INTEL_ATOM_GOLDMONT_PLUS,	NO_MDS | NO_L1TF | NO_SWAPGS | NO_ITLB_MULTIHIT | NO_MMIO | NO_EIBRS_PBRSB),
+	VULNWL_INTEL(ATOM_GOLDMONT,		NO_MDS | NO_L1TF | NO_SWAPGS | NO_ITLB_MULTIHIT | NO_MMIO),
+	VULNWL_INTEL(ATOM_GOLDMONT_D,		NO_MDS | NO_L1TF | NO_SWAPGS | NO_ITLB_MULTIHIT | NO_MMIO),
+	VULNWL_INTEL(ATOM_GOLDMONT_PLUS,	NO_MDS | NO_L1TF | NO_SWAPGS | NO_ITLB_MULTIHIT | NO_MMIO | NO_EIBRS_PBRSB),
 
 	/*
 	 * Technically, swapgs isn't serializing on AMD (despite it previously
@@ -1180,9 +1180,9 @@ static const __initconst struct x86_cpu_id cpu_vuln_whitelist[] = {
 	 * good enough for our purposes.
 	 */
 
-	VULNWL_INTEL(INTEL_ATOM_TREMONT,	NO_EIBRS_PBRSB),
-	VULNWL_INTEL(INTEL_ATOM_TREMONT_L,	NO_EIBRS_PBRSB),
-	VULNWL_INTEL(INTEL_ATOM_TREMONT_D,	NO_ITLB_MULTIHIT | NO_EIBRS_PBRSB),
+	VULNWL_INTEL(ATOM_TREMONT,	NO_EIBRS_PBRSB),
+	VULNWL_INTEL(ATOM_TREMONT_L,	NO_EIBRS_PBRSB),
+	VULNWL_INTEL(ATOM_TREMONT_D,	NO_ITLB_MULTIHIT | NO_EIBRS_PBRSB),
 
 	/* AMD Family 0xf - 0x12 */
 	VULNWL_AMD(0x0f,	NO_MELTDOWN | NO_SSB | NO_L1TF | NO_MDS | NO_SWAPGS | NO_ITLB_MULTIHIT | NO_MMIO | NO_BHI),
@@ -1203,8 +1203,11 @@ static const __initconst struct x86_cpu_id cpu_vuln_whitelist[] = {
 #define VULNBL(vendor, family, model, blacklist)	\
 	X86_MATCH_VENDOR_FAM_MODEL(vendor, family, model, blacklist)
 
-#define VULNBL_INTEL_STEPPINGS(vfm, steppings, issues)		   \
-	X86_MATCH_VFM_STEPPINGS(vfm, steppings, issues)
+#define VULNBL_INTEL(vfm, issues)			\
+	X86_MATCH_VFM(INTEL_##vfm, issues)
+
+#define VULNBL_INTEL_STEPPINGS(vfm, steppings, issues)	\
+	X86_MATCH_VFM_STEPPINGS(INTEL_##vfm, steppings, issues)
 
 #define VULNBL_AMD(family, blacklist)		\
 	VULNBL(AMD, family, X86_MODEL_ANY, blacklist)
@@ -1229,43 +1232,45 @@ static const __initconst struct x86_cpu_id cpu_vuln_whitelist[] = {
 #define RFDS		BIT(7)
 
 static const struct x86_cpu_id cpu_vuln_blacklist[] __initconst = {
-	VULNBL_INTEL_STEPPINGS(INTEL_IVYBRIDGE,		X86_STEPPING_ANY,		SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_HASWELL,		X86_STEPPING_ANY,		SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_HASWELL_L,		X86_STEPPING_ANY,		SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_HASWELL_G,		X86_STEPPING_ANY,		SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_HASWELL_X,		X86_STEPPING_ANY,		MMIO),
-	VULNBL_INTEL_STEPPINGS(INTEL_BROADWELL_D,	X86_STEPPING_ANY,		MMIO),
-	VULNBL_INTEL_STEPPINGS(INTEL_BROADWELL_G,	X86_STEPPING_ANY,		SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_BROADWELL_X,	X86_STEPPING_ANY,		MMIO),
-	VULNBL_INTEL_STEPPINGS(INTEL_BROADWELL,		X86_STEPPING_ANY,		SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_SKYLAKE_X,		X86_STEPPING_ANY,		MMIO | RETBLEED | GDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_SKYLAKE_L,		X86_STEPPING_ANY,		MMIO | RETBLEED | GDS | SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_SKYLAKE,		X86_STEPPING_ANY,		MMIO | RETBLEED | GDS | SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_KABYLAKE_L,	X86_STEPPING_ANY,		MMIO | RETBLEED | GDS | SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_KABYLAKE,		X86_STEPPING_ANY,		MMIO | RETBLEED | GDS | SRBDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_CANNONLAKE_L,	X86_STEPPING_ANY,		RETBLEED),
-	VULNBL_INTEL_STEPPINGS(INTEL_ICELAKE_L,		X86_STEPPING_ANY,		MMIO | MMIO_SBDS | RETBLEED | GDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ICELAKE_D,		X86_STEPPING_ANY,		MMIO | GDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ICELAKE_X,		X86_STEPPING_ANY,		MMIO | GDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_COMETLAKE,		X86_STEPPING_ANY,		MMIO | MMIO_SBDS | RETBLEED | GDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_COMETLAKE_L,	X86_STEPPINGS(0x0, 0x0),	MMIO | RETBLEED),
-	VULNBL_INTEL_STEPPINGS(INTEL_COMETLAKE_L,	X86_STEPPING_ANY,		MMIO | MMIO_SBDS | RETBLEED | GDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_TIGERLAKE_L,	X86_STEPPING_ANY,		GDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_TIGERLAKE,		X86_STEPPING_ANY,		GDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_LAKEFIELD,		X86_STEPPING_ANY,		MMIO | MMIO_SBDS | RETBLEED),
-	VULNBL_INTEL_STEPPINGS(INTEL_ROCKETLAKE,	X86_STEPPING_ANY,		MMIO | RETBLEED | GDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ALDERLAKE,		X86_STEPPING_ANY,		RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ALDERLAKE_L,	X86_STEPPING_ANY,		RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_RAPTORLAKE,	X86_STEPPING_ANY,		RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_RAPTORLAKE_P,	X86_STEPPING_ANY,		RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_RAPTORLAKE_S,	X86_STEPPING_ANY,		RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ATOM_GRACEMONT,	X86_STEPPING_ANY,		RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ATOM_TREMONT,	X86_STEPPING_ANY,		MMIO | MMIO_SBDS | RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ATOM_TREMONT_D,	X86_STEPPING_ANY,		MMIO | RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ATOM_TREMONT_L,	X86_STEPPING_ANY,		MMIO | MMIO_SBDS | RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ATOM_GOLDMONT,	X86_STEPPING_ANY,		RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ATOM_GOLDMONT_D,	X86_STEPPING_ANY,		RFDS),
-	VULNBL_INTEL_STEPPINGS(INTEL_ATOM_GOLDMONT_PLUS, X86_STEPPING_ANY,		RFDS),
+	VULNBL_INTEL(IVYBRIDGE,			SRBDS),
+	VULNBL_INTEL(HASWELL,			SRBDS),
+	VULNBL_INTEL(HASWELL_L,			SRBDS),
+	VULNBL_INTEL(HASWELL_G,			SRBDS),
+	VULNBL_INTEL(HASWELL_X,			MMIO),
+	VULNBL_INTEL(BROADWELL_D,		MMIO),
+	VULNBL_INTEL(BROADWELL_G,		SRBDS),
+	VULNBL_INTEL(BROADWELL_X,		MMIO),
+	VULNBL_INTEL(BROADWELL,			SRBDS),
+	VULNBL_INTEL(SKYLAKE_X,			MMIO | RETBLEED | GDS),
+	VULNBL_INTEL(SKYLAKE_L,			MMIO | RETBLEED | GDS | SRBDS),
+	VULNBL_INTEL(SKYLAKE,			MMIO | RETBLEED | GDS | SRBDS),
+	VULNBL_INTEL(KABYLAKE_L,		MMIO | RETBLEED | GDS | SRBDS),
+	VULNBL_INTEL(KABYLAKE,			MMIO | RETBLEED | GDS | SRBDS),
+	VULNBL_INTEL(CANNONLAKE_L,		RETBLEED),
+	VULNBL_INTEL(ICELAKE_L,			MMIO | MMIO_SBDS | RETBLEED | GDS),
+	VULNBL_INTEL(ICELAKE_D,			MMIO | GDS),
+	VULNBL_INTEL(ICELAKE_X,			MMIO | GDS),
+	VULNBL_INTEL(COMETLAKE,			MMIO | MMIO_SBDS | RETBLEED | GDS),
+	VULNBL_INTEL(TIGERLAKE_L,		GDS),
+	VULNBL_INTEL(TIGERLAKE,			GDS),
+	VULNBL_INTEL(LAKEFIELD,			MMIO | MMIO_SBDS | RETBLEED),
+	VULNBL_INTEL(ROCKETLAKE,		MMIO | RETBLEED | GDS),
+	VULNBL_INTEL(ALDERLAKE,			RFDS),
+	VULNBL_INTEL(ALDERLAKE_L,		RFDS),
+	VULNBL_INTEL(RAPTORLAKE,		RFDS),
+	VULNBL_INTEL(RAPTORLAKE_P,		RFDS),
+	VULNBL_INTEL(RAPTORLAKE_S,		RFDS),
+	VULNBL_INTEL(ATOM_GRACEMONT,		RFDS),
+	VULNBL_INTEL(ATOM_TREMONT,		MMIO | MMIO_SBDS | RFDS),
+	VULNBL_INTEL(ATOM_TREMONT_D,		MMIO | RFDS),
+	VULNBL_INTEL(ATOM_TREMONT_L,		MMIO | MMIO_SBDS | RFDS),
+	VULNBL_INTEL(ATOM_GOLDMONT,		RFDS),
+	VULNBL_INTEL(ATOM_GOLDMONT_D,		RFDS),
+	VULNBL_INTEL(ATOM_GOLDMONT_PLUS,	RFDS),
+
+	/* Match more than Vendor/Family/Model */
+	VULNBL_INTEL_STEPPINGS(COMETLAKE_L,	X86_STEPPINGS(0x0, 0x0),	MMIO | RETBLEED),
+	VULNBL_INTEL	      (COMETLAKE_L,					MMIO | MMIO_SBDS | RETBLEED | GDS),
 
 	VULNBL_AMD(0x15, RETBLEED),
 	VULNBL_AMD(0x16, RETBLEED),

-- 
2.34.1
Re: [PATCH PATCH v2 8/9] x86/bugs: Declutter vulnerable CPU list
Posted by Josh Poimboeuf 1 year, 7 months ago 
On Thu, Jun 27, 2024 at 01:44:48PM -0700, Pawan Gupta wrote:
> The affected processor table has a lot of repetition and redundant
> information that can be omitted. For example:
> 
>   VULNBL_INTEL_STEPPINGS(INTEL_IVYBRIDGE,		X86_STEPPING_ANY,		SRBDS),
> 
> can easily be simplified to:
> 
>   VULNBL_INTEL(IVYBRIDGE,	SRBDS),
> 
> Apply this to all the entries in the affected processor table.
> 
> No functional change. Disassembly of arch/x86/kernel/cpu/common.o does not
> show any difference before and after the change.

This patch only changes data, not code.  So there's not much point in
diffing the disassembly ;-)

A diff of the .init.rodata sections actually shows one (non-functional)
difference in cpu_vuln_blacklist[].

The COMETLAKE_L entries were moved to a new section below the rest of
the entries:

	/* Match more than Vendor/Family/Model */
	VULNBL_INTEL_STEPPINGS(COMETLAKE_L,	X86_STEPPINGS(0x0, 0x0),	MMIO | RETBLEED),
	VULNBL_INTEL	      (COMETLAKE_L,					MMIO | MMIO_SBDS | RETBLEED | GDS),

While that's functionally correct, it breaks the visual sorting, which
is confusing and even a bit dangerous.  One would reasonably expect the
COMETLAKE_L entries to come immediately after COMETLAKE, so it would be
quite possible for somebody to come along later and add a new
COMETLAKE_L there which conflicts with the later entries.

I'd much rather leave the STEPPINGS entry in the original list where it
belongs.  Something like:

	...
	VULNBL_INTEL(ICELAKE_L,			MMIO | MMIO_SBDS | RETBLEED | GDS),
	VULNBL_INTEL(ICELAKE_D,			MMIO | GDS),
	VULNBL_INTEL(ICELAKE_X,			MMIO | GDS),
	VULNBL_INTEL(COMETLAKE,			MMIO | MMIO_SBDS | RETBLEED | GDS),
	VULNBL_INTEL_STEPPINGS(COMETLAKE_L,
			       X86_STEPPINGS(0x0, 0x0),
			       MMIO | RETBLEED),
	VULNBL_INTEL(COMETLAKE_L,		MMIO | MMIO_SBDS | RETBLEED | GDS),
	VULNBL_INTEL(TIGERLAKE_L,		GDS),
	VULNBL_INTEL(TIGERLAKE,			GDS),
	...

Yes, that's a little ugly, but at least the sorting is correct so it's
less confusing and more robust overall.

-- 
Josh
Re: [PATCH PATCH v2 8/9] x86/bugs: Declutter vulnerable CPU list
Posted by Pawan Gupta 1 year, 7 months ago 
On Tue, Jul 02, 2024 at 06:00:18PM -0700, Josh Poimboeuf wrote:
> On Thu, Jun 27, 2024 at 01:44:48PM -0700, Pawan Gupta wrote:
> > The affected processor table has a lot of repetition and redundant
> > information that can be omitted. For example:
> > 
> >   VULNBL_INTEL_STEPPINGS(INTEL_IVYBRIDGE,		X86_STEPPING_ANY,		SRBDS),
> > 
> > can easily be simplified to:
> > 
> >   VULNBL_INTEL(IVYBRIDGE,	SRBDS),
> > 
> > Apply this to all the entries in the affected processor table.
> > 
> > No functional change. Disassembly of arch/x86/kernel/cpu/common.o does not
> > show any difference before and after the change.
> 
> This patch only changes data, not code.  So there's not much point in
> diffing the disassembly ;-)

You are right.

> A diff of the .init.rodata sections actually shows one (non-functional)
> difference in cpu_vuln_blacklist[].
> 
> The COMETLAKE_L entries were moved to a new section below the rest of
> the entries:
> 
> 	/* Match more than Vendor/Family/Model */
> 	VULNBL_INTEL_STEPPINGS(COMETLAKE_L,	X86_STEPPINGS(0x0, 0x0),	MMIO | RETBLEED),
> 	VULNBL_INTEL	      (COMETLAKE_L,					MMIO | MMIO_SBDS | RETBLEED | GDS),
> 
> While that's functionally correct, it breaks the visual sorting, which
> is confusing and even a bit dangerous.  One would reasonably expect the
> COMETLAKE_L entries to come immediately after COMETLAKE, so it would be
> quite possible for somebody to come along later and add a new
> COMETLAKE_L there which conflicts with the later entries.
> 
> I'd much rather leave the STEPPINGS entry in the original list where it
> belongs.  Something like:
> 
> 	...
> 	VULNBL_INTEL(ICELAKE_L,			MMIO | MMIO_SBDS | RETBLEED | GDS),
> 	VULNBL_INTEL(ICELAKE_D,			MMIO | GDS),
> 	VULNBL_INTEL(ICELAKE_X,			MMIO | GDS),
> 	VULNBL_INTEL(COMETLAKE,			MMIO | MMIO_SBDS | RETBLEED | GDS),
> 	VULNBL_INTEL_STEPPINGS(COMETLAKE_L,
> 			       X86_STEPPINGS(0x0, 0x0),
> 			       MMIO | RETBLEED),
> 	VULNBL_INTEL(COMETLAKE_L,		MMIO | MMIO_SBDS | RETBLEED | GDS),
> 	VULNBL_INTEL(TIGERLAKE_L,		GDS),
> 	VULNBL_INTEL(TIGERLAKE,			GDS),
> 	...
> 
> Yes, that's a little ugly, but at least the sorting is correct so it's
> less confusing and more robust overall.

That makes sense, I will make that change.

Patchew 2.1-devel-b67e4c2

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