arm64: KVM: HYP mode idmap support

Add the necessary infrastructure for identity-mapped HYP page
tables. Idmap-ed code must be in the ".hyp.idmap.text" linker
section.

The rest of the HYP ends up in ".hyp.text".

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
(cherry picked from commit 2240bbb697354f5617d95e3ee104ca61bb812507)
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>

diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index ce2d97255ba950837c9946f032454070ee3344e3..55d0e035205f0156e6b272ac6fe9fd83c6ea4fa8 100644 (file)
--- a/arch/arm64/kernel/vmlinux.lds.S
+++ b/arch/arm64/kernel/vmlinux.lds.S
@@ -17,6 +17,19 @@ ENTRY(stext)
 
 jiffies = jiffies_64;
 
+#define HYPERVISOR_TEXT                                        \
+       /*                                              \
+        * Force the alignment to be compatible with    \
+        * the vectors requirements                     \
+        */                                             \
+       . = ALIGN(2048);                                \
+       VMLINUX_SYMBOL(__hyp_idmap_text_start) = .;     \
+       *(.hyp.idmap.text)                              \
+       VMLINUX_SYMBOL(__hyp_idmap_text_end) = .;       \
+       VMLINUX_SYMBOL(__hyp_text_start) = .;           \
+       *(.hyp.text)                                    \
+       VMLINUX_SYMBOL(__hyp_text_end) = .;
+
 SECTIONS
 {
        /*
@@ -48,6 +61,7 @@ SECTIONS
                        TEXT_TEXT
                        SCHED_TEXT
                        LOCK_TEXT
+                       HYPERVISOR_TEXT
                        *(.fixup)
                        *(.gnu.warning)
                . = ALIGN(16);
@@ -102,3 +116,9 @@ SECTIONS
        STABS_DEBUG
        .comment 0 : { *(.comment) }
 }
+
+/*
+ * The HYP init code can't be more than a page long.
+ */
+ASSERT(((__hyp_idmap_text_start + PAGE_SIZE) > __hyp_idmap_text_end),
+       "HYP init code too big")