Merge remote-tracking branch 'remotes/pmaydell/tags/pull-target-arm-20161024' into staging

target-arm queue:
 * support variable (runtime-determined) page sizes, for a
   nearly-20% speedup of TCG for ARMv7 and v8 CPUs with 4K pages
 * ptimer: add tests, support more flexible behaviour around
   what happens on the "zero" tick, use ptimer for a9gtimer
 * virt: ACPI: Add IORT Structure definition
 * i2c: Fix SMBus read transactions to avoid double events
 * timer: stm32f2xx_timer: add check for prescaler value
 * QOMify musicpal, pxa2xx_gpio, strongarm, pl110
 * target-arm: Implement new HLT trap for semihosting
 * i2c: Add asserts for second smbus i2c_start_transfer()

# gpg: Signature made Mon 24 Oct 2016 18:24:17 BST
# gpg:                using RSA key 0x3C2525ED14360CDE
# gpg: Good signature from "Peter Maydell <peter.maydell@linaro.org>"
# gpg:                 aka "Peter Maydell <pmaydell@gmail.com>"
# gpg:                 aka "Peter Maydell <pmaydell@chiark.greenend.org.uk>"
# Primary key fingerprint: E1A5 C593 CD41 9DE2 8E83  15CF 3C25 25ED 1436 0CDE

* remotes/pmaydell/tags/pull-target-arm-20161024: (32 commits)
  i2c: Add asserts for second smbus i2c_start_transfer()
  target-arm: Implement new HLT trap for semihosting
  hw/display: QOM'ify pl110.c
  hw/arm: QOM'ify strongarm.c
  hw/arm: QOM'ify pxa2xx_gpio.c
  hw/arm: QOM'ify musicpal.c
  timer: stm32f2xx_timer: add check for prescaler value
  i2c: Fix SMBus read transactions to avoid double events
  timer: a9gtimer: remove loop to auto-increment comparator
  ARM: Virt: ACPI: Build an IORT table with RC and ITS nodes
  ACPI: Add IORT Structure definition
  tests: Add tests for the ARM MPTimer
  arm_mptimer: Convert to use ptimer
  tests: ptimer: Replace 10000 with 1
  tests: ptimer: Change the copyright comment
  tests: ptimer: Add tests for "no counter round down" policy
  hw/ptimer: Add "no counter round down" policy
  tests: ptimer: Add tests for "no immediate reload" policy
  hw/ptimer: Add "no immediate reload" policy
  tests: ptimer: Add tests for "no immediate trigger" policy
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/target-arm/cpu.c b/target-arm/cpu.c
index 1b9540e085..c94a324540 100644
--- a/target-arm/cpu.c
+++ b/target-arm/cpu.c
@@ -576,6 +576,7 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp)
     ARMCPU *cpu = ARM_CPU(dev);
     ARMCPUClass *acc = ARM_CPU_GET_CLASS(dev);
     CPUARMState *env = &cpu->env;
+    int pagebits;
 
     /* Some features automatically imply others: */
     if (arm_feature(env, ARM_FEATURE_V8)) {
@@ -631,6 +632,29 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp)
         set_feature(env, ARM_FEATURE_THUMB_DSP);
     }
 
+    if (arm_feature(env, ARM_FEATURE_V7) &&
+        !arm_feature(env, ARM_FEATURE_M) &&
+        !arm_feature(env, ARM_FEATURE_MPU)) {
+        /* v7VMSA drops support for the old ARMv5 tiny pages, so we
+         * can use 4K pages.
+         */
+        pagebits = 12;
+    } else {
+        /* For CPUs which might have tiny 1K pages, or which have an
+         * MPU and might have small region sizes, stick with 1K pages.
+         */
+        pagebits = 10;
+    }
+    if (!set_preferred_target_page_bits(pagebits)) {
+        /* This can only ever happen for hotplugging a CPU, or if
+         * the board code incorrectly creates a CPU which it has
+         * promised via minimum_page_size that it will not.
+         */
+        error_setg(errp, "This CPU requires a smaller page size than the "
+                   "system is using");
+        return;
+    }
+
     if (cpu->reset_hivecs) {
             cpu->reset_sctlr |= (1 << 13);
     }