[Qemu-devel] [PATCH v2 14/14] target-arm: A64: fix TLB flush instructions

[Eric Blake]

From: Alex Bennée <address@hidden>

According to the ARM ARM we weren't correctly flushing the TLB entries
where bits 63:56 didn't match bit 55 of the virtual address. This
exposed a problem when we switched QEMU's internal TARGET_PAGE_BITS to
12 for aarch64.

Signed-off-by: Alex Bennée <address@hidden>
Reviewed-by: Peter Maydell <address@hidden>
Message-id: address@hidden
Signed-off-by: Peter Maydell <address@hidden>
---
 target-arm/helper.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/target-arm/helper.c b/target-arm/helper.c
index 35c11e7..f630d96 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -1801,12 +1801,17 @@ static CPAccessResult aa64_cacheop_access(CPUARMState 
*env,
     return CP_ACCESS_OK;
 }

+/* See: D4.7.2 TLB maintenance requirements and the TLB maintenance 
instructions
+ * Page D4-1736 (DDI0487A.b)
+ */
+
 static void tlbi_aa64_va_write(CPUARMState *env, const ARMCPRegInfo *ri,
                                uint64_t value)
 {
     /* Invalidate by VA (AArch64 version) */
     ARMCPU *cpu = arm_env_get_cpu(env);
-    uint64_t pageaddr = value << 12;
+    uint64_t pageaddr = sextract64(value << 12, 0, 56);
+
     tlb_flush_page(CPU(cpu), pageaddr);
 }

@@ -1815,7 +1820,8 @@ static void tlbi_aa64_vaa_write(CPUARMState *env, const 
ARMCPRegInfo *ri,
 {
     /* Invalidate by VA, all ASIDs (AArch64 version) */
     ARMCPU *cpu = arm_env_get_cpu(env);
-    uint64_t pageaddr = value << 12;
+    uint64_t pageaddr = sextract64(value << 12, 0, 56);
+
     tlb_flush_page(CPU(cpu), pageaddr);
 }

-- 
1.9.3