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arm: Fix trapping to Hypervisor during MSR/MRS read/write

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This patch restricts trapping to hypervisor only if we are in the
correct exception level for the trap to happen.

Change-Id: I0a382b6a572ef835ea36d2702b8a81b633bd3df0
This commit is contained in:
Dylan Johnson 2016-08-02 10:38:03 +01:00
parent c2271e301d
commit 02fcca9b6f
3 changed files with 18 additions and 15 deletions
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4
src/arch/arm/isa/insts/data64.isa
View file

@ -1,6 +1,6 @@
// -*- mode:c++ -*-
// Copyright (c) 2011-2013 ARM Limited
// Copyright (c) 2011-2013, 2016 ARM Limited
// All rights reserved
//
// The license below extends only to copyright in the software and shall
@ -310,7 +310,7 @@ let {{
// Check for traps to hypervisor
if ((ArmSystem::haveVirtualization(xc->tcBase()) && el <= EL2) &&
msrMrs64TrapToHyp(flat_idx, %s, CptrEl264, Hcr64, &is_vfp_neon)) {
msrMrs64TrapToHyp(flat_idx, el, %s, CptrEl264, Hcr64, &is_vfp_neon)) {
return std::make_shared<HypervisorTrap>(
machInst, is_vfp_neon ? 0x1E00000 : imm,
is_vfp_neon ? EC_TRAPPED_SIMD_FP : EC_TRAPPED_MSR_MRS_64);

25
src/arch/arm/utility.cc
View file

@ -590,7 +590,9 @@ msrMrs64TrapToSup(const MiscRegIndex miscReg, ExceptionLevel el,
}
bool
msrMrs64TrapToHyp(const MiscRegIndex miscReg, bool isRead,
msrMrs64TrapToHyp(const MiscRegIndex miscReg,
ExceptionLevel el,
bool isRead,
CPTR cptr /* CPTR_EL2 */,
HCR hcr /* HCR_EL2 */,
bool * isVfpNeon)
@ -608,7 +610,7 @@ msrMrs64TrapToHyp(const MiscRegIndex miscReg, bool isRead,
break;
// CPACR
case MISCREG_CPACR_EL1:
trapToHyp = cptr.tcpac;
trapToHyp = cptr.tcpac && el == EL1;
break;
// Virtual memory control regs
case MISCREG_SCTLR_EL1:
@ -622,7 +624,8 @@ msrMrs64TrapToHyp(const MiscRegIndex miscReg, bool isRead,
case MISCREG_MAIR_EL1:
case MISCREG_AMAIR_EL1:
case MISCREG_CONTEXTIDR_EL1:
trapToHyp = (hcr.trvm && isRead) || (hcr.tvm && !isRead);
trapToHyp = ((hcr.trvm && isRead) || (hcr.tvm && !isRead))
&& el == EL1;
break;
// TLB maintenance instructions
case MISCREG_TLBI_VMALLE1:
@ -637,30 +640,30 @@ msrMrs64TrapToHyp(const MiscRegIndex miscReg, bool isRead,
case MISCREG_TLBI_VAAE1IS_Xt:
case MISCREG_TLBI_VALE1IS_Xt:
case MISCREG_TLBI_VAALE1IS_Xt:
trapToHyp = hcr.ttlb;
trapToHyp = hcr.ttlb && el == EL1;
break;
// Cache maintenance instructions to the point of unification
case MISCREG_IC_IVAU_Xt:
case MISCREG_ICIALLU:
case MISCREG_ICIALLUIS:
case MISCREG_DC_CVAU_Xt:
trapToHyp = hcr.tpu;
trapToHyp = hcr.tpu && el <= EL1;
break;
// Data/Unified cache maintenance instructions to the point of coherency
case MISCREG_DC_IVAC_Xt:
case MISCREG_DC_CIVAC_Xt:
case MISCREG_DC_CVAC_Xt:
trapToHyp = hcr.tpc;
trapToHyp = hcr.tpc && el <= EL1;
break;
// Data/Unified cache maintenance instructions by set/way
case MISCREG_DC_ISW_Xt:
case MISCREG_DC_CSW_Xt:
case MISCREG_DC_CISW_Xt:
trapToHyp = hcr.tsw;
trapToHyp = hcr.tsw && el == EL1;
break;
// ACTLR
case MISCREG_ACTLR_EL1:
trapToHyp = hcr.tacr;
trapToHyp = hcr.tacr && el == EL1;
break;
// @todo: Trap implementation-dependent functionality based on
@ -695,20 +698,20 @@ msrMrs64TrapToHyp(const MiscRegIndex miscReg, bool isRead,
case MISCREG_ID_AA64AFR0_EL1:
case MISCREG_ID_AA64AFR1_EL1:
assert(isRead);
trapToHyp = hcr.tid3;
trapToHyp = hcr.tid3 && el == EL1;
break;
// ID regs, group 2
case MISCREG_CTR_EL0:
case MISCREG_CCSIDR_EL1:
case MISCREG_CLIDR_EL1:
case MISCREG_CSSELR_EL1:
trapToHyp = hcr.tid2;
trapToHyp = hcr.tid2 && el <= EL1;
break;
// ID regs, group 1
case MISCREG_AIDR_EL1:
case MISCREG_REVIDR_EL1:
assert(isRead);
trapToHyp = hcr.tid1;
trapToHyp = hcr.tid1 && el == EL1;
break;
default:
break;

4
src/arch/arm/utility.hh
View file

@ -265,8 +265,8 @@ mcrrMrrc15TrapToHyp(const MiscRegIndex miscReg, CPSR cpsr, SCR scr, HSTR hstr,
bool msrMrs64TrapToSup(const MiscRegIndex miscReg, ExceptionLevel el,
CPACR cpacr);
bool msrMrs64TrapToHyp(const MiscRegIndex miscReg, bool isRead, CPTR cptr,
HCR hcr, bool * isVfpNeon);
bool msrMrs64TrapToHyp(const MiscRegIndex miscReg, ExceptionLevel el,
bool isRead, CPTR cptr, HCR hcr, bool * isVfpNeon);
bool msrMrs64TrapToMon(const MiscRegIndex miscReg, CPTR cptr,
ExceptionLevel el, bool * isVfpNeon);