From: Peter Maydell <peter.maydell@linaro.org>
Date: Tue, 14 Aug 2018 16:17:19 +0000 (+0100)
Subject: target/arm: Allow execution from small regions
X-Git-Tag: qemu-xen-4.13.0-rc1~712^2~35
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=d4b6275df320cee764d56b194b1898547f545857;p=qemu-xen.git

target/arm: Allow execution from small regions

Now that we have full support for small regions, including execution,
we can remove the workarounds where we marked all small regions as
non-executable for the M-profile MPU and SAU.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Tested-by: Cédric Le Goater <clg@kaod.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20180710160013.26559-7-peter.maydell@linaro.org
---

diff --git a/target/arm/helper.c b/target/arm/helper.c
index 63a7006561..02c1c4d840 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -9795,17 +9795,6 @@ static bool get_phys_addr_pmsav7(CPUARMState *env, uint32_t address,
 
     fi->type = ARMFault_Permission;
     fi->level = 1;
-    /*
-     * Core QEMU code can't handle execution from small pages yet, so
-     * don't try it. This way we'll get an MPU exception, rather than
-     * eventually causing QEMU to exit in get_page_addr_code().
-     */
-    if (*page_size < TARGET_PAGE_SIZE && (*prot & PAGE_EXEC)) {
-        qemu_log_mask(LOG_UNIMP,
-                      "MPU: No support for execution from regions "
-                      "smaller than 1K\n");
-        *prot &= ~PAGE_EXEC;
-    }
     return !(*prot & (1 << access_type));
 }
 
@@ -10056,18 +10045,6 @@ static bool pmsav8_mpu_lookup(CPUARMState *env, uint32_t address,
 
     fi->type = ARMFault_Permission;
     fi->level = 1;
-    /*
-     * Core QEMU code can't handle execution from small pages yet, so
-     * don't try it. This means any attempted execution will generate
-     * an MPU exception, rather than eventually causing QEMU to exit in
-     * get_page_addr_code().
-     */
-    if (*is_subpage && (*prot & PAGE_EXEC)) {
-        qemu_log_mask(LOG_UNIMP,
-                      "MPU: No support for execution from regions "
-                      "smaller than 1K\n");
-        *prot &= ~PAGE_EXEC;
-    }
     return !(*prot & (1 << access_type));
 }