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>

1 files changed, 20 insertions, 0 deletions

diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S
index 3fae2be8b016..b0c51b7d6293 100644
--- 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
 {
         /*
@@ -49,6 +62,7 @@ SECTIONS
                         TEXT_TEXT
                         SCHED_TEXT
                         LOCK_TEXT
+                        HYPERVISOR_TEXT
                         *(.fixup)
                         *(.gnu.warning)
                 . = ALIGN(16);
@@ -124,3 +138,9 @@ 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")