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    Subject[PATCH 22/24] prepare x86_64 architecture initialization for paravirt
    Date
    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>
    ---
    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 */
    --
    1.4.4.2
    -
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