linux-kernel - [PATCH v2 1/3] x86/numa: Fix SRAT lookup of CFMWS ranges with numa_fill

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Message-ID: <20240319120026.2246389-2-rrichter@amd.com>
Date: Tue, 19 Mar 2024 13:00:23 +0100
From: Robert Richter <rrichter@....com>
To: "Rafael J. Wysocki" <rafael@...nel.org>, Dave Hansen
	<dave.hansen@...ux.intel.com>, Andy Lutomirski <luto@...nel.org>, "Peter
 Zijlstra" <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>, "Ingo
 Molnar" <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, <x86@...nel.org>,
	Dan Williams <dan.j.williams@...el.com>, Alison Schofield
	<alison.schofield@...el.com>
CC: <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-cxl@...r.kernel.org>, Robert Richter <rrichter@....com>, Derick Marks
	<derick.w.marks@...el.com>, "H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH v2 1/3] x86/numa: Fix SRAT lookup of CFMWS ranges with numa_fill_memblks()

For configurations that have the kconfig option NUMA_KEEP_MEMINFO
disabled, the SRAT lookup done with numa_fill_memblks() fails
returning NUMA_NO_MEMBLK (-1). An existing SRAT memory range cannot be
found for a CFMWS address range. This causes the addition of a
duplicate numa_memblk with a different node id and a subsequent page
fault and kernel crash during boot.

numa_fill_memblks() is implemented and used in the init section only.
The option NUMA_KEEP_MEMINFO is only for the case when NUMA data will
be used outside of init. So fix the SRAT lookup by moving
numa_fill_memblks() out of the NUMA_KEEP_MEMINFO block to make it
always available in the init section.

Note that the issue was initially introduced with [1]. But since
phys_to_target_node() was originally used that returned the valid node
0, an additional numa_memblk was not added. Though, the node id was
wrong too.

[1] fd49f99c1809 ("ACPI: NUMA: Add a node and memblk for each CFMWS not in SRAT")

Fixes: 8f1004679987 ("ACPI/NUMA: Apply SRAT proximity domain to entire CFMWS window")
Cc: Derick Marks <derick.w.marks@...el.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Alison Schofield <alison.schofield@...el.com>
Signed-off-by: Robert Richter <rrichter@....com>
---
 arch/x86/mm/numa.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 65e9a6e391c0..ce84ba86e69e 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -929,6 +929,8 @@ int memory_add_physaddr_to_nid(u64 start)
 }
 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);

+#endif
+
 static int __init cmp_memblk(const void *a, const void *b)
 {
 	const struct numa_memblk *ma = *(const struct numa_memblk **)a;
@@ -1001,5 +1003,3 @@ int __init numa_fill_memblks(u64 start, u64 end)
 	}
 	return 0;
 }
-
-#endif
-- 
2.39.2