linux-kernel - Re: [PATCH 12/12] EFI: Runtime services virtual mapping

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Message-ID: <20131021124739.GA4515@dhcp-16-126.nay.redhat.com>
Date:	Mon, 21 Oct 2013 20:47:39 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Matt Fleming <matt@...sole-pimps.org>, X86 ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...e.de>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Vivek Goyal <vgoyal@...hat.com>, linux-efi@...r.kernel.org,
	fwts-devel@...ts.ubuntu.com
Subject: Re: [PATCH 12/12] EFI: Runtime services virtual mapping

On 10/14/13 at 05:58pm, Borislav Petkov wrote:
> On Sun, Oct 13, 2013 at 11:25:21AM +0200, Borislav Petkov wrote:
> > In the meantime, I'll finish randconfigs testing of the patches and
> > upload the latest version to k-org, I'll let you know.
> 
> Ok, here it is:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp.git#efi
> 
> This version seems to work on most boxes except Matt's Asus half-life
> zombie.

What's the status of this series?

> 
> Let me know if there are issues,

I need below patch for mapping to fixed virt addr passed
from 1st kernel. Would you like to add it to your series
or I send out it later?

BTW, what tree should my patches based on? Matt's next tree?
Looks like your tree is not consistant with Matt's tree.

--

Add function efi_map_region_fixed for mapping to a specific
virt address. 

Signed-off-by: Dave Young <dyoung@...hat.com>
---
 arch/x86/platform/efi/efi.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)

--- bp.orig/arch/x86/platform/efi/efi.c
+++ bp/arch/x86/platform/efi/efi.c
@@ -1086,6 +1086,19 @@ static void efi_merge_regions(void)
 	}
 }
 
+void __init efi_map_region_fixed(efi_memory_desc_t *md, u64 virt_addr)
+{
+	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, virt_addr, md->num_pages, pf))
+		pr_warning("Error mapping PA 0x%llx -> VA 0x%llx!\n",
+			   md->phys_addr, virt_addr);
+}
+
 /*
  * Map efi memory ranges for runtime serivce
  * Return the new memmap with updated virtual addrresses.
--
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