linux-kernel - Re: [PATCH] x86: x86_{phys,virt}

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Date:	Fri, 5 Sep 2008 09:56:23 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Jan Beulich" <jbeulich@...ell.com>, tglx@...utronix.de,
	hpa@...or.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: x86_{phys,virt}_bits field also for i386 (v2)

On Fri, Sep 5, 2008 at 8:00 AM, Ingo Molnar <mingo@...e.hu> wrote:
>
> * Jan Beulich <jbeulich@...ell.com> wrote:
>
>> Make the x86_{phys,virt}_bits common for 32- and 64-bits, and use the
>> former in ioremap's phys_addr_valid() check also on 32bit/PAE.
>>
>> Signed-off-by: Jan Beulich <jbeulich@...ell.com>
>>
>> ---
>>  arch/x86/kernel/cpu/common.c |   17 +++++++++++++++++
>>  arch/x86/mm/ioremap.c        |   15 ++++++---------
>>  include/asm-x86/processor.h  |    4 ++--
>>  3 files changed, 25 insertions(+), 11 deletions(-)
>
> hm, the cpu/common.c bits just got reworked massively in tip/master.
> I've tried a blind merge (see the patch below) but at least the first
> hunk looks wrong. Mind looking at how to merge this?
>
>        Ingo
>
> --------------->
> Subject: x86: x86_{phys,virt}_bits field also for i386 (v2)
> From: "Jan Beulich" <jbeulich@...ell.com>
> Date: Fri, 05 Sep 2008 13:07:24 +0100
>
> Make the x86_{phys,virt}_bits common for 32- and 64-bits, and use the
> former in ioremap's phys_addr_valid() check also on 32bit/PAE.
>
> Signed-off-by: Jan Beulich <jbeulich@...ell.com>
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
>
> ---
>  arch/x86/kernel/cpu/common.c |   17 +++++++++++++++++
>  arch/x86/mm/ioremap.c        |   15 ++++++---------
>  include/asm-x86/processor.h  |    4 ++--
>  3 files changed, 25 insertions(+), 11 deletions(-)
>
> Index: tip/arch/x86/kernel/cpu/common.c
> ===================================================================
> --- tip.orig/arch/x86/kernel/cpu/common.c
> +++ tip/arch/x86/kernel/cpu/common.c
> @@ -464,6 +464,18 @@ static void __cpuinit get_cpu_cap(struct
>                        c->x86_capability[1] = cpuid_edx(0x80000001);
>                        c->x86_capability[6] = cpuid_ecx(0x80000001);
>                }
> +                       if (xlvl >= 0x80000008) {
> +                               u32 eax = cpuid_eax(0x80000008);
> +
> +                               c->x86_phys_bits = eax & 0xff;
> +                               c->x86_virt_bits = (eax >> 8) & 0xff;
> +                               /* CPUID workaround for Intel 0F33/0F34 CPU */
> +                               if (c->x86_vendor == X86_VENDOR_INTEL
> +                                   && c->x86 == 0xF && c->x86_model == 0x3
> +                                   && (c->x86_mask == 0x3
> +                                       || c->x86_mask == 0x4))
> +                                       c->x86_phys_bits = 36;
> +                       }
>        }
>
>  #ifdef CONFIG_X86_64

there is the same code in the same func for 64 bit.

also could move the intel workaround code to early_init_intel and init_intel of
intel.c/intel_64.c

YH
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