[Qemu-devel] [PATCH 4/4] target-arm: Avoid unnecessary TLB flush on TCR_EL2 writes

[Peter Maydell <peter.maydell@linaro.org>]

The TCR_EL2 regdef was incorrectly using the vmsa_tcr_el1_write
function for writes. Since TCR_EL2 doesn't have the A1 bit that
TCR_EL1 does, we don't need to do a tlb_flush() when it is written.
Remove the unnecessary .writefn and also the harmless but unneeded
.raw_writefn and .resetfn definitions.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target-arm/helper.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/target-arm/helper.c b/target-arm/helper.c
index 09638b2..4dbd844 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -3559,8 +3559,10 @@ static const ARMCPRegInfo el2_cp_reginfo[] = {
       .resetvalue = 0 },
     { .name = "TCR_EL2", .state = ARM_CP_STATE_BOTH,
       .opc0 = 3, .opc1 = 4, .crn = 2, .crm = 0, .opc2 = 2,
-      .access = PL2_RW, .writefn = vmsa_tcr_el1_write,
-      .resetfn = vmsa_ttbcr_reset, .raw_writefn = raw_write,
+      .access = PL2_RW,
+      /* no .writefn needed as this can't cause an ASID change;
+       * no .raw_writefn or .resetfn needed as we never use mask/base_mask
+       */
       .fieldoffset = offsetof(CPUARMState, cp15.tcr_el[2]) },
     { .name = "VTCR", .state = ARM_CP_STATE_AA32,
       .cp = 15, .opc1 = 4, .crn = 2, .crm = 1, .opc2 = 2,
-- 
1.9.1