From 7f4fbfb5dc08fe3fb6829bde8e4072d6cb214931 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Fri, 23 Sep 2022 13:34:10 +0100 Subject: [PATCH] target/arm: Mark registers which call pmu_op_start() as ARM_CP_IO In commit 01765386a888 we made some system register write functions call pmu_op_start()/pmu_op_finish(). This means that they now touch timers, so for icount to work these registers must have the ARM_CP_IO flag set. This fixes a bug where when icount is enabled a guest that touches MDCR_EL3, MDCR_EL2, PMCNTENSET_EL0 or PMCNTENCLR_EL0 would cause QEMU to print an error message and exit, for example: [ 2.495971] TCP: Hash tables configured (established 1024 bind 1024) [ 2.496213] UDP hash table entries: 256 (order: 1, 8192 bytes) [ 2.496386] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes) [ 2.496917] NET: Registered protocol family 1 qemu-system-aarch64: Bad icount read Reported-by: Thomas Huth Signed-off-by: Peter Maydell Reviewed-by: Richard Henderson Message-id: 20220923123412.1214041-2-peter.maydell@linaro.org --- target/arm/helper.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/target/arm/helper.c b/target/arm/helper.c index b5dac651e7..fadeed0b6b 100644 --- a/target/arm/helper.c +++ b/target/arm/helper.c @@ -1927,12 +1927,12 @@ static const ARMCPRegInfo v7_cp_reginfo[] = { * or PL0_RO as appropriate and then check PMUSERENR in the helper fn. */ { .name = "PMCNTENSET", .cp = 15, .crn = 9, .crm = 12, .opc1 = 0, .opc2 = 1, - .access = PL0_RW, .type = ARM_CP_ALIAS, + .access = PL0_RW, .type = ARM_CP_ALIAS | ARM_CP_IO, .fieldoffset = offsetoflow32(CPUARMState, cp15.c9_pmcnten), .writefn = pmcntenset_write, .accessfn = pmreg_access, .raw_writefn = raw_write }, - { .name = "PMCNTENSET_EL0", .state = ARM_CP_STATE_AA64, + { .name = "PMCNTENSET_EL0", .state = ARM_CP_STATE_AA64, .type = ARM_CP_IO, .opc0 = 3, .opc1 = 3, .crn = 9, .crm = 12, .opc2 = 1, .access = PL0_RW, .accessfn = pmreg_access, .fieldoffset = offsetof(CPUARMState, cp15.c9_pmcnten), .resetvalue = 0, @@ -1942,11 +1942,11 @@ static const ARMCPRegInfo v7_cp_reginfo[] = { .fieldoffset = offsetoflow32(CPUARMState, cp15.c9_pmcnten), .accessfn = pmreg_access, .writefn = pmcntenclr_write, - .type = ARM_CP_ALIAS }, + .type = ARM_CP_ALIAS | ARM_CP_IO }, { .name = "PMCNTENCLR_EL0", .state = ARM_CP_STATE_AA64, .opc0 = 3, .opc1 = 3, .crn = 9, .crm = 12, .opc2 = 2, .access = PL0_RW, .accessfn = pmreg_access, - .type = ARM_CP_ALIAS, + .type = ARM_CP_ALIAS | ARM_CP_IO, .fieldoffset = offsetof(CPUARMState, cp15.c9_pmcnten), .writefn = pmcntenclr_write }, { .name = "PMOVSR", .cp = 15, .crn = 9, .crm = 12, .opc1 = 0, .opc2 = 3, @@ -5125,7 +5125,7 @@ static const ARMCPRegInfo v8_cp_reginfo[] = { .opc0 = 3, .opc1 = 6, .crn = 1, .crm = 3, .opc2 = 1, .resetvalue = 0, .access = PL3_RW, .fieldoffset = offsetof(CPUARMState, cp15.mdcr_el3) }, - { .name = "SDCR", .type = ARM_CP_ALIAS, + { .name = "SDCR", .type = ARM_CP_ALIAS | ARM_CP_IO, .cp = 15, .opc1 = 0, .crn = 1, .crm = 3, .opc2 = 1, .access = PL1_RW, .accessfn = access_trap_aa32s_el1, .writefn = sdcr_write, @@ -7832,7 +7832,7 @@ void register_cp_regs_for_features(ARMCPU *cpu) * value is MDCR_EL2.HPMN which should reset to the value of PMCR_EL0.N. */ ARMCPRegInfo mdcr_el2 = { - .name = "MDCR_EL2", .state = ARM_CP_STATE_BOTH, + .name = "MDCR_EL2", .state = ARM_CP_STATE_BOTH, .type = ARM_CP_IO, .opc0 = 3, .opc1 = 4, .crn = 1, .crm = 1, .opc2 = 1, .writefn = mdcr_el2_write, .access = PL2_RW, .resetvalue = pmu_num_counters(env),