| Message ID | 20240419140203.1996635-2-rrichter@amd.com |
|---|---|
| State | New |
| Headers | show |
| Series | SRAT/CEDT fixes and updates | expand |
On Fri, Apr 19, 2024 at 04:01:59PM +0200, Robert Richter wrote: > 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] commit 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@intel.com> > Cc: Dan Williams <dan.j.williams@intel.com> > Cc: Alison Schofield <alison.schofield@intel.com> > Signed-off-by: Robert Richter <rrichter@amd.com> > --- with the assumption that this is passing 0-day builds... Reviewed-by: Alison Schofield <alison.schofield@intel.com> > arch/x86/include/asm/sparsemem.h | 2 +- > arch/x86/mm/numa.c | 4 ++-- > 2 files changed, 3 insertions(+), 3 deletions(-) > > diff --git a/arch/x86/include/asm/sparsemem.h b/arch/x86/include/asm/sparsemem.h > index 1be13b2dfe8b..1aaa447ef24b 100644 > --- a/arch/x86/include/asm/sparsemem.h > +++ b/arch/x86/include/asm/sparsemem.h > @@ -37,9 +37,9 @@ extern int phys_to_target_node(phys_addr_t start); > #define phys_to_target_node phys_to_target_node > extern int memory_add_physaddr_to_nid(u64 start); > #define memory_add_physaddr_to_nid memory_add_physaddr_to_nid > +#endif > extern int numa_fill_memblks(u64 start, u64 end); > #define numa_fill_memblks numa_fill_memblks > -#endif > #endif /* __ASSEMBLY__ */ > > #endif /* _ASM_X86_SPARSEMEM_H */ > 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 >
Robert Richter wrote: > 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. Wrong node seems worth notifying and we can figure out on the backend where the backport makes sense. > > [1] commit 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@intel.com> > Cc: Dan Williams <dan.j.williams@intel.com> > Cc: Alison Schofield <alison.schofield@intel.com> > Signed-off-by: Robert Richter <rrichter@amd.com> > --- > arch/x86/include/asm/sparsemem.h | 2 +- > arch/x86/mm/numa.c | 4 ++-- > 2 files changed, 3 insertions(+), 3 deletions(-) > > diff --git a/arch/x86/include/asm/sparsemem.h b/arch/x86/include/asm/sparsemem.h > index 1be13b2dfe8b..1aaa447ef24b 100644 > --- a/arch/x86/include/asm/sparsemem.h > +++ b/arch/x86/include/asm/sparsemem.h > @@ -37,9 +37,9 @@ extern int phys_to_target_node(phys_addr_t start); > #define phys_to_target_node phys_to_target_node > extern int memory_add_physaddr_to_nid(u64 start); > #define memory_add_physaddr_to_nid memory_add_physaddr_to_nid > +#endif > extern int numa_fill_memblks(u64 start, u64 end); > #define numa_fill_memblks numa_fill_memblks It just feels like numa_fill_memblks() has absolutely no business being defined in arch/x86/include/asm/sparsemem.h. The only use for numa_fill_memblks() is to arrange for NUMA nodes to be applied to memory ranges hot-onlined by the CXL driver. It belongs right next to numa_add_memblk(), and I suspect arch/x86/include/asm/sparsemem.h was only chosen to avoid figuring out what to do about the fact that linux/numa.h does not include asm/numa.h and that all implementations either provide numa_add_memblk() or select the generic implementation. So I would prefer that this do the proper fix and get numa_fill_memblks() completely out of the sparsemem.h path. Something like the following which boots for me: diff --git a/arch/x86/include/asm/numa.h b/arch/x86/include/asm/numa.h index ef2844d69173..12a93a3466c4 100644 --- a/arch/x86/include/asm/numa.h +++ b/arch/x86/include/asm/numa.h @@ -26,6 +26,7 @@ extern s16 __apicid_to_node[MAX_LOCAL_APIC]; extern nodemask_t numa_nodes_parsed __initdata; extern int __init numa_add_memblk(int nodeid, u64 start, u64 end); +extern int __init numa_fill_memblks(u64 start, u64 end); extern void __init numa_set_distance(int from, int to, int distance); static inline void set_apicid_to_node(int apicid, s16 node) diff --git a/arch/x86/include/asm/sparsemem.h b/arch/x86/include/asm/sparsemem.h index 1be13b2dfe8b..64df897c0ee3 100644 --- a/arch/x86/include/asm/sparsemem.h +++ b/arch/x86/include/asm/sparsemem.h @@ -37,8 +37,6 @@ extern int phys_to_target_node(phys_addr_t start); #define phys_to_target_node phys_to_target_node extern int memory_add_physaddr_to_nid(u64 start); #define memory_add_physaddr_to_nid memory_add_physaddr_to_nid -extern int numa_fill_memblks(u64 start, u64 end); -#define numa_fill_memblks numa_fill_memblks #endif #endif /* __ASSEMBLY__ */ diff --git a/drivers/acpi/numa/srat.c b/drivers/acpi/numa/srat.c index e45e64993c50..3b09fd39eeb4 100644 --- a/drivers/acpi/numa/srat.c +++ b/drivers/acpi/numa/srat.c @@ -208,6 +208,11 @@ int __init srat_disabled(void) return acpi_numa < 0; } +__weak int __init numa_fill_memblks(u64 start, u64 end) +{ + return NUMA_NO_MEMBLK; +} + #if defined(CONFIG_X86) || defined(CONFIG_ARM64) || defined(CONFIG_LOONGARCH) /* * Callback for SLIT parsing. pxm_to_node() returns NUMA_NO_NODE for diff --git a/include/linux/numa.h b/include/linux/numa.h index 915033a75731..8485d98e554d 100644 --- a/include/linux/numa.h +++ b/include/linux/numa.h @@ -36,13 +36,6 @@ int memory_add_physaddr_to_nid(u64 start); int phys_to_target_node(u64 start); #endif -#ifndef numa_fill_memblks -static inline int __init numa_fill_memblks(u64 start, u64 end) -{ - return NUMA_NO_MEMBLK; -} -#endif - #else /* !CONFIG_NUMA */ static inline int numa_nearest_node(int node, unsigned int state) {
diff --git a/arch/x86/include/asm/sparsemem.h b/arch/x86/include/asm/sparsemem.h index 1be13b2dfe8b..1aaa447ef24b 100644 --- a/arch/x86/include/asm/sparsemem.h +++ b/arch/x86/include/asm/sparsemem.h @@ -37,9 +37,9 @@ extern int phys_to_target_node(phys_addr_t start); #define phys_to_target_node phys_to_target_node extern int memory_add_physaddr_to_nid(u64 start); #define memory_add_physaddr_to_nid memory_add_physaddr_to_nid +#endif extern int numa_fill_memblks(u64 start, u64 end); #define numa_fill_memblks numa_fill_memblks -#endif #endif /* __ASSEMBLY__ */ #endif /* _ASM_X86_SPARSEMEM_H */ 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
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] commit 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@intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Alison Schofield <alison.schofield@intel.com> Signed-off-by: Robert Richter <rrichter@amd.com> --- arch/x86/include/asm/sparsemem.h | 2 +- arch/x86/mm/numa.c | 4 ++-- 2 files changed, 3 insertions(+), 3 deletions(-)