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

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Date: Mon, 18 Mar 2024 22:09:00 +0100
From: Robert Richter <rrichter@....com>
To: "Rafael J. Wysocki" <rafael@...nel.org>, Alison Schofield
	<alison.schofield@...el.com>, Dan Williams <dan.j.williams@...el.com>, "Dave
 Hansen" <dave.hansen@...ux.intel.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>, Len Brown <lenb@...nel.org>
Subject: [PATCH 1/3] x86/numa: Fix SRAT lookup for CFMWS ranges with numa_fill_memblks()

With 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.

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.

Fix this by enabling NUMA_KEEP_MEMINFO for x86 with ACPI and NUMA
enabled.

[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>
---
 drivers/acpi/numa/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/acpi/numa/Kconfig b/drivers/acpi/numa/Kconfig
index 849c2bd820b9..2f4ac6ac6768 100644
--- a/drivers/acpi/numa/Kconfig
+++ b/drivers/acpi/numa/Kconfig
@@ -3,6 +3,7 @@ config ACPI_NUMA
 	bool "NUMA support"
 	depends on NUMA
 	depends on (X86 || ARM64 || LOONGARCH)
+	select NUMA_KEEP_MEMINFO if X86
 	default y if ARM64

 config ACPI_HMAT
-- 
2.39.2