[xen master] xen/x86: Provide helpers for common code to access acpi_numa

[patchbot@xxxxxxx]

commit 9bbfd7b14c4ad3774d88fe6430ab8726720633ec
Author:     Wei Chen <wei.chen@xxxxxxx>
AuthorDate: Mon Dec 12 12:10:18 2022 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Dec 12 12:10:18 2022 +0100

    xen/x86: Provide helpers for common code to access acpi_numa
    
    acpi_numa is a specific NUMA switch for ACPI NUMA implementation.
    Other NUMA implementation may not need this switch. But this switch is
    not only used by ACPI code, it is also used directly in some general
    NUMA logic code. So far this hasn't caused any problem because Xen only
    has x86 implementing ACPI NUMA, but now Arm is implementing device tree
    based NUMA. Accesssing acpi_numa directly in some functions will be a
    block of reusing NUMA common code. It is also difficult for us to replace
    it with a new generic switch, because it is hard to prove that the new
    switch states can guarantee the original code will work correctly.
    
    So in this patch, we provide two helpers for common code to update and
    get states of acpi_numa. And other new NUMA implementations just need
    to provide the same helpers for common code. In this case, the generic
    NUMA logic code can be reused by all NUMA implementations.
    
    Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/include/asm/numa.h |  5 +++--
 xen/arch/x86/numa.c             | 38 +++++++++++++++++++++++++-------------
 2 files changed, 28 insertions(+), 15 deletions(-)

diff --git a/xen/arch/x86/include/asm/numa.h b/xen/arch/x86/include/asm/numa.h
index c32ccffde3..237f2c6dbf 100644
--- a/xen/arch/x86/include/asm/numa.h
+++ b/xen/arch/x86/include/asm/numa.h
@@ -32,8 +32,9 @@ extern void numa_add_cpu(int cpu);
 extern void numa_init_array(void);
 extern bool numa_off;
 
-
-extern int srat_disabled(void);
+extern int arch_numa_setup(const char *opt);
+extern bool arch_numa_disabled(void);
+extern bool srat_disabled(void);
 extern void numa_set_node(int cpu, nodeid_t node);
 extern nodeid_t setup_node(unsigned int pxm);
 extern void srat_detect_node(int cpu);
diff --git a/xen/arch/x86/numa.c b/xen/arch/x86/numa.c
index 322157fab7..1c3198445d 100644
--- a/xen/arch/x86/numa.c
+++ b/xen/arch/x86/numa.c
@@ -50,9 +50,28 @@ nodemask_t __read_mostly node_online_map = { { [0] = 1UL } };
 bool numa_off;
 s8 acpi_numa = 0;
 
-int srat_disabled(void)
+int __init arch_numa_setup(const char *opt)
 {
-    return numa_off || acpi_numa < 0;
+#ifdef CONFIG_ACPI_NUMA
+    if ( !strncmp(opt, "noacpi", 6) )
+    {
+        numa_off = false;
+        acpi_numa = -1;
+        return 0;
+    }
+#endif
+
+    return -EINVAL;
+}
+
+bool arch_numa_disabled(void)
+{
+    return acpi_numa < 0;
+}
+
+bool srat_disabled(void)
+{
+    return numa_off || arch_numa_disabled();
 }
 
 /*
@@ -294,28 +313,21 @@ void numa_set_node(int cpu, nodeid_t node)
 /* [numa=off] */
 static int __init cf_check numa_setup(const char *opt)
 {
-    if ( !strncmp(opt,"off",3) )
+    if ( !strncmp(opt, "off", 3) )
         numa_off = true;
-    else if ( !strncmp(opt,"on",2) )
+    else if ( !strncmp(opt, "on", 2) )
         numa_off = false;
 #ifdef CONFIG_NUMA_EMU
     else if ( !strncmp(opt, "fake=", 5) )
     {
         numa_off = false;
-        numa_fake = simple_strtoul(opt+5,NULL,0);
+        numa_fake = simple_strtoul(opt + 5, NULL, 0);
         if ( numa_fake >= MAX_NUMNODES )
             numa_fake = MAX_NUMNODES;
     }
-#endif
-#ifdef CONFIG_ACPI_NUMA
-    else if ( !strncmp(opt,"noacpi",6) )
-    {
-        numa_off = false;
-        acpi_numa = -1;
-    }
 #endif
     else
-        return -EINVAL;
+        return arch_numa_setup(opt);
 
     return 0;
 } 
--
generated by git-patchbot for /home/xen/git/xen.git#master