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[Qemu-arm] [PATCH v2] target-arm: Avoid unnecessary TLB flush on TCR_EL2
From: |
Peter Maydell |
Subject: |
[Qemu-arm] [PATCH v2] target-arm: Avoid unnecessary TLB flush on TCR_EL2, TCR_EL3 writes |
Date: |
Tue, 10 May 2016 11:11:13 +0100 |
The TCR_EL2 and TCR_EL3 regdefs wer incorrectly using the
vmsa_tcr_el1_write function for writes. Since these registers don't
have the A1 bit that TCR_EL1 does, we don't need to do a tlb_flush()
when they are written. Remove the unnecessary .writefn and also the
harmless but unneeded .raw_writefn and .resetfn definitions.
Signed-off-by: Peter Maydell <address@hidden>
---
v1->v2 changes: extend to TCR_EL3 as suggested by Sergey.
target-arm/helper.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/target-arm/helper.c b/target-arm/helper.c
index 09638b2..cbb9d92 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,
@@ -3753,8 +3755,10 @@ static const ARMCPRegInfo el3_cp_reginfo[] = {
.fieldoffset = offsetof(CPUARMState, cp15.ttbr0_el[3]) },
{ .name = "TCR_EL3", .state = ARM_CP_STATE_AA64,
.opc0 = 3, .opc1 = 6, .crn = 2, .crm = 0, .opc2 = 2,
- .access = PL3_RW, .writefn = vmsa_tcr_el1_write,
- .resetfn = vmsa_ttbcr_reset, .raw_writefn = raw_write,
+ .access = PL3_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[3]) },
{ .name = "ELR_EL3", .state = ARM_CP_STATE_AA64,
.type = ARM_CP_ALIAS,
--
1.9.1
- [Qemu-arm] [PATCH v2] target-arm: Avoid unnecessary TLB flush on TCR_EL2, TCR_EL3 writes,
Peter Maydell <=