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[V2,1/7] arm/arm64: KVM: Formalise end of direct linear map

Message ID 20171218214736.13761-2-steve.capper@arm.com (mailing list archive)
State New, archived
Headers show

Commit Message

Steve Capper Dec. 18, 2017, 9:47 p.m. UTC 
We assume that the direct linear map ends at ~0 in the KVM HYP map
intersection checking code. This assumption will become invalid later on
for arm64 when the address space of the kernel is re-arranged.

This patch introduces a new constant PAGE_OFFSET_END for both arm and
arm64 and defines it to be ~0UL

Signed-off-by: Steve Capper <steve.capper@arm.com>
---
 arch/arm/include/asm/memory.h   | 1 +
 arch/arm64/include/asm/memory.h | 1 +
 virt/kvm/arm/mmu.c              | 4 ++--
 3 files changed, 4 insertions(+), 2 deletions(-)
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Patch

diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index 1f54e4e98c1e..e223a945c361 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -30,6 +30,7 @@ 
 
 /* PAGE_OFFSET - the virtual address of the start of the kernel image */
 #define PAGE_OFFSET		UL(CONFIG_PAGE_OFFSET)
+#define PAGE_OFFSET_END		(~0UL)
 
 #ifdef CONFIG_MMU
 
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index d4bae7d6e0d8..2dedc775d151 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -67,6 +67,7 @@ 
 	(UL(1) << VA_BITS) + 1)
 #define PAGE_OFFSET		(UL(0xffffffffffffffff) - \
 	(UL(1) << (VA_BITS - 1)) + 1)
+#define PAGE_OFFSET_END		(~0UL)
 #define KIMAGE_VADDR		(MODULES_END)
 #define MODULES_END		(MODULES_VADDR + MODULES_VSIZE)
 #define MODULES_VADDR		(VA_START + KASAN_SHADOW_SIZE)
diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
index 6633f5f07200..d1f79383fca5 100644
--- a/virt/kvm/arm/mmu.c
+++ b/virt/kvm/arm/mmu.c
@@ -1794,10 +1794,10 @@  int kvm_mmu_init(void)
 	kvm_debug("IDMAP page: %lx\n", hyp_idmap_start);
 	kvm_debug("HYP VA range: %lx:%lx\n",
 		  kern_hyp_va(PAGE_OFFSET),
-		  kern_hyp_va((unsigned long)high_memory - 1));
+		  kern_hyp_va(PAGE_OFFSET_END));
 
 	if (hyp_idmap_start >= kern_hyp_va(PAGE_OFFSET) &&
-	    hyp_idmap_start <  kern_hyp_va((unsigned long)high_memory - 1) &&
+	    hyp_idmap_start <  kern_hyp_va(PAGE_OFFSET_END) &&
 	    hyp_idmap_start != (unsigned long)__hyp_idmap_text_start) {
 		/*
 		 * The idmap page is intersecting with the VA space,