linux-kernel - Re: [patch 1/6] Add function efi_remap_region for remapping to saved virt address

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Message-ID: <20131028012516.GE4397@dhcp-16-126.nay.redhat.com>
Date:	Mon, 28 Oct 2013 09:25:16 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	linux-kernel@...r.kernel.org, linux-efi@...r.kernel.org,
	x86@...nel.org, mjg59@...f.ucam.org, hpa@...or.com,
	James.Bottomley@...senPartnership.com, vgoyal@...hat.com,
	ebiederm@...ssion.com, horms@...ge.net.au,
	kexec@...ts.fedoraproject.org, kexec@...ts.infradead.org
Subject: Re: [patch 1/6] Add function efi_remap_region for remapping to saved
 virt address

Hi, Thanks for review

On 10/27/13 at 12:50pm, Borislav Petkov wrote:
> On Sun, Oct 27, 2013 at 11:47:14AM +0800, dyoung@...hat.com wrote:
> > Kexec kernel will use saved runtime virtual mapping, so add a
> > new function efi_remap_region to remapping it directly without
> > calculate the virt addr from efi_va.
> > 
> > The md is passed in from 1st kernel, the virtual addr is
> > saved in md->virt_addr.
> > 
> > Signed-off-by: Dave Young <dyoung@...hat.com>
> > ---
> >  arch/x86/include/asm/efi.h     |    1 +
> >  arch/x86/platform/efi/efi_32.c |    4 ++++
> >  arch/x86/platform/efi/efi_64.c |   13 +++++++++++++
> >  3 files changed, 18 insertions(+)
> > 
> > --- linux-2.6.orig/arch/x86/include/asm/efi.h
> > +++ linux-2.6/arch/x86/include/asm/efi.h
> > @@ -112,6 +112,7 @@ extern void efi_call_phys_epilog(void);
> >  extern void efi_unmap_memmap(void);
> >  extern void efi_memory_uc(u64 addr, unsigned long size);
> >  extern void __init efi_map_region(efi_memory_desc_t *md);
> > +extern void __init efi_remap_region(efi_memory_desc_t *md);
> >  extern void efi_sync_low_kernel_mappings(void);
> >  extern void __init old_map_region(efi_memory_desc_t *md);
> >  
> > --- linux-2.6.orig/arch/x86/platform/efi/efi_64.c
> > +++ linux-2.6/arch/x86/platform/efi/efi_64.c
> > @@ -177,6 +177,19 @@ void __init efi_map_region(efi_memory_de
> >  	md->virt_addr = efi_va;
> >  }
> >  
> > +void __init efi_remap_region(efi_memory_desc_t *md)
> 
> remap? Why?
> 
> You did have efi_map_region_fixed() which made more sense.

remap here means mapping to same virt addr in 2nd kernel, I feel
it's a little better, but I have no strong opinion.

Will change to _fixed

> 
> > +{
> > +	pgd_t *pgd = (pgd_t *)__va(real_mode_header->trampoline_pgd);
> > +	unsigned long pf = 0;
> > +
> > +	if (!(md->attribute & EFI_MEMORY_WB))
> > +		pf |= _PAGE_PCD;
> > +
> > +	if(kernel_map_pages_in_pgd(pgd, md->phys_addr, md->virt_addr, md->num_pages, pf))
> 
> ERROR: space required before the open parenthesis '('
> #59: FILE: arch/x86/platform/efi/efi_64.c:188:
> +       if(kernel_map_pages_in_pgd(pgd, md->phys_addr, md->virt_addr, md->num_pages, pf))

Will fix

> 
> 
> Please run them all through checkpatch.pl - better yet, integrate
> checkpatch into your workflow like using git hooks, for example.

Hmm, will do. Have been long time being away from sending patches.

> 
> > +		pr_warning("Error mapping PA 0x%llx -> VA 0x%llx!\n",
> 
> WARNING: Prefer pr_warn(... to pr_warning(...
> #60: FILE: arch/x86/platform/efi/efi_64.c:189:
> +               pr_warning("Error mapping PA 0x%llx -> VA 0x%llx!\n",

Will fix

> 
> > +			   md->phys_addr, md->virt_addr);
> > +}
> > +
> >  void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
> >  				 u32 type, u64 attribute)
> >  {
> > --- linux-2.6.orig/arch/x86/platform/efi/efi_32.c
> > +++ linux-2.6/arch/x86/platform/efi/efi_32.c
> > @@ -46,6 +46,10 @@ void __init efi_map_region(efi_memory_de
> >  	old_map_region(md);
> >  }
> >  
> > +void __init efi_remap_region(efi_memory_desc_t *md)
> > +{
> > +}
> 
> Let's keep braces on the same line as the function to save space:

Ok, will update

> 
> void __init efi_remap_region(efi_memory_desc_t *md) {}
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> Sent from a fat crate under my desk. Formatting is fine.
> --
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