x86, msr: Add support for non-contiguous cpumasks
The current rd/wrmsr_on_cpus helpers assume that the supplied cpumasks are contiguous. However, there are machines out there like some K8 multinode Opterons which have a non-contiguous core enumeration on each node (e.g. cores 0,2 on node 0 instead of 0,1), see http://www.gossamer-threads.com/lists/linux/kernel/1160268. This patch fixes out-of-bounds writes (see URL above) by adding per-CPU msr structs which are used on the respective cores. Additionally, two helpers, msrs_{alloc,free}, are provided for use by the callers of the MSR accessors. Cc: H. Peter Anvin <hpa@zytor.com> Cc: Mauro Carvalho Chehab <mchehab@redhat.com> Cc: Aristeu Rozanski <aris@redhat.com> Cc: Randy Dunlap <randy.dunlap@oracle.com> Cc: Doug Thompson <dougthompson@xmission.com> Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> LKML-Reference: <20091211171440.GD31998@aftab> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
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5c6baba84e
commit
505422517d
3 changed files with 42 additions and 33 deletions
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@ -244,6 +244,9 @@ do { \
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#define write_rdtscp_aux(val) wrmsr(0xc0000103, (val), 0)
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struct msr *msrs_alloc(void);
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void msrs_free(struct msr *msrs);
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#ifdef CONFIG_SMP
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int rdmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 *l, u32 *h);
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int wrmsr_on_cpu(unsigned int cpu, u32 msr_no, u32 l, u32 h);
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@ -7,7 +7,6 @@ struct msr_info {
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u32 msr_no;
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struct msr reg;
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struct msr *msrs;
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int off;
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int err;
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};
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@ -18,7 +17,7 @@ static void __rdmsr_on_cpu(void *info)
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int this_cpu = raw_smp_processor_id();
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if (rv->msrs)
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reg = &rv->msrs[this_cpu - rv->off];
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reg = per_cpu_ptr(rv->msrs, this_cpu);
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else
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reg = &rv->reg;
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@ -32,7 +31,7 @@ static void __wrmsr_on_cpu(void *info)
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int this_cpu = raw_smp_processor_id();
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if (rv->msrs)
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reg = &rv->msrs[this_cpu - rv->off];
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reg = per_cpu_ptr(rv->msrs, this_cpu);
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else
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reg = &rv->reg;
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@ -80,7 +79,6 @@ static void __rwmsr_on_cpus(const struct cpumask *mask, u32 msr_no,
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memset(&rv, 0, sizeof(rv));
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rv.off = cpumask_first(mask);
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rv.msrs = msrs;
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rv.msr_no = msr_no;
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@ -120,6 +118,26 @@ void wrmsr_on_cpus(const struct cpumask *mask, u32 msr_no, struct msr *msrs)
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}
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EXPORT_SYMBOL(wrmsr_on_cpus);
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struct msr *msrs_alloc(void)
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{
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struct msr *msrs = NULL;
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msrs = alloc_percpu(struct msr);
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if (!msrs) {
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pr_warning("%s: error allocating msrs\n", __func__);
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return NULL;
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}
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return msrs;
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}
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EXPORT_SYMBOL(msrs_alloc);
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void msrs_free(struct msr *msrs)
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{
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free_percpu(msrs);
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}
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EXPORT_SYMBOL(msrs_free);
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/* These "safe" variants are slower and should be used when the target MSR
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may not actually exist. */
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static void __rdmsr_safe_on_cpu(void *info)
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@ -13,6 +13,8 @@ module_param(report_gart_errors, int, 0644);
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static int ecc_enable_override;
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module_param(ecc_enable_override, int, 0644);
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static struct msr *msrs;
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/* Lookup table for all possible MC control instances */
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struct amd64_pvt;
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static struct mem_ctl_info *mci_lookup[EDAC_MAX_NUMNODES];
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@ -2495,8 +2497,7 @@ static void get_cpus_on_this_dct_cpumask(struct cpumask *mask, int nid)
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static bool amd64_nb_mce_bank_enabled_on_node(int nid)
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{
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cpumask_var_t mask;
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struct msr *msrs;
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int cpu, nbe, idx = 0;
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int cpu, nbe;
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bool ret = false;
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if (!zalloc_cpumask_var(&mask, GFP_KERNEL)) {
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@ -2507,32 +2508,22 @@ static bool amd64_nb_mce_bank_enabled_on_node(int nid)
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get_cpus_on_this_dct_cpumask(mask, nid);
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msrs = kzalloc(sizeof(struct msr) * cpumask_weight(mask), GFP_KERNEL);
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if (!msrs) {
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amd64_printk(KERN_WARNING, "%s: error allocating msrs\n",
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__func__);
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free_cpumask_var(mask);
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return false;
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}
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rdmsr_on_cpus(mask, MSR_IA32_MCG_CTL, msrs);
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for_each_cpu(cpu, mask) {
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nbe = msrs[idx].l & K8_MSR_MCGCTL_NBE;
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struct msr *reg = per_cpu_ptr(msrs, cpu);
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nbe = reg->l & K8_MSR_MCGCTL_NBE;
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debugf0("core: %u, MCG_CTL: 0x%llx, NB MSR is %s\n",
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cpu, msrs[idx].q,
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cpu, reg->q,
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(nbe ? "enabled" : "disabled"));
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if (!nbe)
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goto out;
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idx++;
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}
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ret = true;
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out:
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kfree(msrs);
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free_cpumask_var(mask);
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return ret;
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}
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@ -2540,8 +2531,7 @@ static bool amd64_nb_mce_bank_enabled_on_node(int nid)
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static int amd64_toggle_ecc_err_reporting(struct amd64_pvt *pvt, bool on)
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{
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cpumask_var_t cmask;
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struct msr *msrs = NULL;
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int cpu, idx = 0;
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int cpu;
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if (!zalloc_cpumask_var(&cmask, GFP_KERNEL)) {
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amd64_printk(KERN_WARNING, "%s: error allocating mask\n",
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@ -2551,34 +2541,27 @@ static int amd64_toggle_ecc_err_reporting(struct amd64_pvt *pvt, bool on)
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get_cpus_on_this_dct_cpumask(cmask, pvt->mc_node_id);
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msrs = kzalloc(sizeof(struct msr) * cpumask_weight(cmask), GFP_KERNEL);
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if (!msrs) {
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amd64_printk(KERN_WARNING, "%s: error allocating msrs\n",
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__func__);
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return -ENOMEM;
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}
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rdmsr_on_cpus(cmask, MSR_IA32_MCG_CTL, msrs);
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for_each_cpu(cpu, cmask) {
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struct msr *reg = per_cpu_ptr(msrs, cpu);
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if (on) {
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if (msrs[idx].l & K8_MSR_MCGCTL_NBE)
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if (reg->l & K8_MSR_MCGCTL_NBE)
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pvt->flags.ecc_report = 1;
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msrs[idx].l |= K8_MSR_MCGCTL_NBE;
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reg->l |= K8_MSR_MCGCTL_NBE;
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} else {
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/*
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* Turn off ECC reporting only when it was off before
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*/
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if (!pvt->flags.ecc_report)
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msrs[idx].l &= ~K8_MSR_MCGCTL_NBE;
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reg->l &= ~K8_MSR_MCGCTL_NBE;
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}
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idx++;
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}
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wrmsr_on_cpus(cmask, MSR_IA32_MCG_CTL, msrs);
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kfree(msrs);
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free_cpumask_var(cmask);
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return 0;
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@ -3036,6 +3019,8 @@ static int __init amd64_edac_init(void)
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if (cache_k8_northbridges() < 0)
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return err;
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msrs = msrs_alloc();
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err = pci_register_driver(&amd64_pci_driver);
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if (err)
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return err;
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@ -3071,6 +3056,9 @@ static void __exit amd64_edac_exit(void)
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edac_pci_release_generic_ctl(amd64_ctl_pci);
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pci_unregister_driver(&amd64_pci_driver);
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msrs_free(msrs);
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msrs = NULL;
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}
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module_init(amd64_edac_init);
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