x86: prepare 64-bit architecture initialization for paravirt

This patch prepares the x86_64 architecture initialization for
paravirt. It requires a memory initialization step, which is done
by implementing 64-bit version for machine_specific_memory_setup,
and putting an ARCH_SETUP hook, for guest-dependent initialization.
This last step is done akin to i386

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/kernel/e820_64.c b/arch/x86/kernel/e820_64.c
index 8e73211..abc473b 100644 (file)
--- a/arch/x86/kernel/e820_64.c
+++ b/arch/x86/kernel/e820_64.c
@@ -638,8 +638,10 @@ static void early_panic(char *msg)
        panic(msg);
 }
 
-void __init setup_memory_region(void)
+/* We're not void only for x86 32-bit compat */
+char * __init machine_specific_memory_setup(void)
 {
+       char *who = "BIOS-e820";
        /*
         * Try to copy the BIOS-supplied E820-map.
         *
@@ -650,7 +652,10 @@ void __init setup_memory_region(void)
        if (copy_e820_map(boot_params.e820_map, boot_params.e820_entries) < 0)
                early_panic("Cannot find a valid memory map");
        printk(KERN_INFO "BIOS-provided physical RAM map:\n");
-       e820_print_map("BIOS-e820");
+       e820_print_map(who);
+
+       /* In case someone cares... */
+       return who;
 }
 
 static int __init parse_memopt(char *p)

diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c
index f2b131e..8dd110d 100644 (file)
--- a/arch/x86/kernel/setup_64.c
+++ b/arch/x86/kernel/setup_64.c
@@ -39,6 +39,7 @@
 #include <linux/dmi.h>
 #include <linux/dma-mapping.h>
 #include <linux/ctype.h>
+#include <linux/uaccess.h>
 
 #include <asm/mtrr.h>
 #include <asm/uaccess.h>
@@ -62,6 +63,12 @@
 #include <asm/mce.h>
 #include <asm/ds.h>
 
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
+#define ARCH_SETUP
+#endif
+
 /*
  * Machine setup..
  */
@@ -246,6 +253,16 @@ static void discover_ebda(void)
         * 4K EBDA area at 0x40E
         */
        ebda_addr = *(unsigned short *)__va(EBDA_ADDR_POINTER);
+       /*
+        * There can be some situations, like paravirtualized guests,
+        * in which there is no available ebda information. In such
+        * case, just skip it
+        */
+       if (!ebda_addr) {
+               ebda_size = 0;
+               return;
+       }
+
        ebda_addr <<= 4;
 
        ebda_size = *(unsigned short *)__va(ebda_addr);
@@ -259,6 +276,12 @@ static void discover_ebda(void)
                ebda_size = 64*1024;
 }
 
+/* Overridden in paravirt.c if CONFIG_PARAVIRT */
+void __attribute__((weak)) memory_setup(void)
+{
+       machine_specific_memory_setup();
+}
+
 void __init setup_arch(char **cmdline_p)
 {
        unsigned i;
@@ -276,7 +299,10 @@ void __init setup_arch(char **cmdline_p)
        rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
        rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
 #endif
-       setup_memory_region();
+
+       ARCH_SETUP
+
+       memory_setup();
        copy_edd();
 
        if (!boot_params.hdr.root_flags)

diff --git a/arch/x86/kernel/smpboot_64.c b/arch/x86/kernel/smpboot_64.c
index c3f2736..cb73c4d 100644 (file)
--- a/arch/x86/kernel/smpboot_64.c
+++ b/arch/x86/kernel/smpboot_64.c
@@ -369,7 +369,7 @@ void __cpuinit start_secondary(void)
 
        unlock_ipi_call_lock();
 
-       setup_secondary_APIC_clock();
+       setup_secondary_clock();
 
        cpu_idle();
 }
@@ -923,7 +923,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
         * Set up local APIC timer on boot CPU.
         */
 
-       setup_boot_APIC_clock();
+       setup_boot_clock();
 }
 
 /*

diff --git a/include/asm-x86/setup.h b/include/asm-x86/setup.h
index 24d786e..071e054 100644 (file)
--- a/include/asm-x86/setup.h
+++ b/include/asm-x86/setup.h
@@ -3,6 +3,13 @@
 
 #define COMMAND_LINE_SIZE 2048
 
+#ifndef __ASSEMBLY__
+char *machine_specific_memory_setup(void);
+#ifndef CONFIG_PARAVIRT
+#define paravirt_post_allocator_init() do {} while (0)
+#endif
+#endif /* __ASSEMBLY__ */
+
 #ifdef __KERNEL__
 
 #ifdef __i386__
@@ -51,9 +58,7 @@ void __init add_memory_region(unsigned long long start,
 
 extern unsigned long init_pg_tables_end;
 
-#ifndef CONFIG_PARAVIRT
-#define paravirt_post_allocator_init() do {} while (0)
-#endif
+
 
 #endif /* __i386__ */
 #endif /* _SETUP */