arm64: kvm: Add support for 16K pages

Now that we can handle stage-2 page tables independent
of the host page table levels, wire up the 16K page
support.

Cc: Marc Zyngier <marc.zyngier@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>

diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h
index 1281d98392a02079801afca15ceb36f09996a882..c6cbb361bbcfcbbf2fb4328963cbb0b0cb03d0d8 100644 (file)
--- a/arch/arm64/include/asm/kvm_arm.h
+++ b/arch/arm64/include/asm/kvm_arm.h
@@ -114,6 +114,7 @@
 #define VTCR_EL2_PS_MASK       TCR_EL2_PS_MASK
 #define VTCR_EL2_TG0_MASK      TCR_TG0_MASK
 #define VTCR_EL2_TG0_4K                TCR_TG0_4K
+#define VTCR_EL2_TG0_16K       TCR_TG0_16K
 #define VTCR_EL2_TG0_64K       TCR_TG0_64K
 #define VTCR_EL2_SH0_MASK      TCR_SH0_MASK
 #define VTCR_EL2_SH0_INNER     TCR_SH0_INNER
@@ -139,7 +140,7 @@
  * (see hyp-init.S).
  *
  * Note that when using 4K pages, we concatenate two first level page tables
- * together.
+ * together. With 16K pages, we concatenate 16 first level page tables.
  *
  * The magic numbers used for VTTBR_X in this patch can be found in Tables
  * D4-23 and D4-25 in ARM DDI 0487A.b.
@@ -157,7 +158,15 @@
  */
 #define VTCR_EL2_TGRAN_FLAGS           (VTCR_EL2_TG0_64K | VTCR_EL2_SL0_LVL1)
 #define VTTBR_X_TGRAN_MAGIC            38
-#else
+#elif defined(CONFIG_ARM64_16K_PAGES)
+/*
+ * Stage2 translation configuration:
+ * 16kB pages (TG0 = 2)
+ * 2 level page tables (SL = 1)
+ */
+#define VTCR_EL2_TGRAN_FLAGS           (VTCR_EL2_TG0_16K | VTCR_EL2_SL0_LVL1)
+#define VTTBR_X_TGRAN_MAGIC            42
+#else  /* 4K */
 /*
  * Stage2 translation configuration:
  * 4kB pages (TG0 = 0)

diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
index de7450df7629961066d0731b237a0fe64c01708e..aa2e34e99582dfd1bd308d0a39829f3ae33a99c5 100644 (file)
--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig
@@ -22,7 +22,6 @@ config KVM_ARM_VGIC_V3
 config KVM
        bool "Kernel-based Virtual Machine (KVM) support"
        depends on OF
-       depends on !ARM64_16K_PAGES
        select MMU_NOTIFIER
        select PREEMPT_NOTIFIERS
        select ANON_INODES