[PATCH 22/24] prepare x86_64 architecture initialization for paravirt

Glauber de Oliveira Costa
2007-11-09T18:43:03Z

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-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Signed-off-by: Steven Rostedt <rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org>
Acked-by: Jeremy Fitzhardinge <jeremy-8XJ3FbD+ij9l57MIdRCFDg@public.gmane.org>
---
arch/x86/kernel/e820_64.c | 9 +++++++--
arch/x86/kernel/setup_64.c | 28 +++++++++++++++++++++++++++-
include/asm-x86/setup.h | 11 ++++++++---
3 files changed, 42 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/e820_64.c b/arch/x86/kernel/e820_64.c
index 0128b0b..eed900b 100644
--- a/arch/x86/kernel/e820_64.c
+++ b/arch/x86/kernel/e820_64.c
@@ -639,8 +639,10 @@ 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.
*
@@ -651,7 +653,10 @@ 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 2451a63..1c9f237 100644
--- 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>
@@ -61,6 +62,12 @@
#include <asm/cacheflush.h>
#include <asm/mce.h>

+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
+#define ARCH_SETUP
+#endif
+
/*
* Machine setup..
*/
@@ -244,6 +251,16 @@ 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);
@@ -257,6 +274,12 @@ 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)
{
printk(KERN_INFO "Command line: %s\n", boot_command_line);
@@ -272,7 +295,10 @@ 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/include/asm-x86/setup.h b/include/asm-x86/setup.h
index 24d786e..071e054 100644
--- 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 */