linux-kernel - [PATCH 5/7 update] arm64/efi: do not enter virtual mode in case booting with efi=noruntime or noefi

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Date:	Mon, 18 Aug 2014 09:30:07 +0800
From:	Dave Young <dyoung@...hat.com>
To:	Will Deacon <will.deacon@....com>
Cc:	Matt Fleming <matt.fleming@...el.com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	"msalter@...hat.com" <msalter@...hat.com>,
	Randy Dunlap <rdunlap@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	Daniel Kiper <daniel.kiper@...cle.com>,
	Russ Anderson <rja@....com>
Subject: [PATCH 5/7 update] arm64/efi: do not enter virtual mode in case
 booting with efi=noruntime or noefi


In case efi runtime disabled via noefi kernel cmdline arm64_enter_virtual_mode
should error out.

At the same time move early_memunmap(memmap.map, mapsize) to the beginning of
the function or it will leak early mem.

Signed-off-by: Dave Young <dyoung@...hat.com>
---
 arch/arm64/kernel/efi.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
index 6ed0362..8f5db4a 100644
--- a/arch/arm64/kernel/efi.c
+++ b/arch/arm64/kernel/efi.c
@@ -392,11 +392,16 @@ static int __init arm64_enter_virtual_mode(void)
 		return -1;
 	}
 
-	pr_info("Remapping and enabling EFI services.\n");
-
-	/* replace early memmap mapping with permanent mapping */
 	mapsize = memmap.map_end - memmap.map;
 	early_memunmap(memmap.map, mapsize);
+
+	if (efi_runtime_disabled()) {
+		pr_info("EFI runtime services will be disabled.\n");
+		return -1;
+	}
+
+	pr_info("Remapping and enabling EFI services.\n");
+	/* replace early memmap mapping with permanent mapping */
 	memmap.map = (__force void *)ioremap_cache((phys_addr_t)memmap.phys_map,
 						   mapsize);
 	memmap.map_end = memmap.map + mapsize;
-- 
1.8.3.1

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