From f02424785ab83bab8283ad33044284f749c08db8 Mon Sep 17 00:00:00 2001 From: Rusty Russell Date: Wed, 1 Aug 2007 10:48:02 +1000 Subject: [PATCH] KVM: Add and use pr_unimpl for standard formatting of unimplemented features All guest-invokable printks should be ratelimited to prevent malicious guests from flooding logs. This is a start. Signed-off-by: Rusty Russell Signed-off-by: Avi Kivity --- drivers/kvm/kvm.h | 8 ++++++++ drivers/kvm/kvm_main.c | 18 ++++++++---------- drivers/kvm/svm.c | 4 ++-- drivers/kvm/vmx.c | 2 +- 4 files changed, 19 insertions(+), 13 deletions(-) diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h index cfda3abff89a..6d258261891e 100644 --- a/drivers/kvm/kvm.h +++ b/drivers/kvm/kvm.h @@ -474,6 +474,14 @@ struct kvm_arch_ops { extern struct kvm_arch_ops *kvm_arch_ops; +/* The guest did something we don't support. */ +#define pr_unimpl(vcpu, fmt, ...) \ + do { \ + if (printk_ratelimit()) \ + printk(KERN_ERR "kvm: %i: cpu%i " fmt, \ + current->tgid, (vcpu)->vcpu_id , ## __VA_ARGS__); \ + } while(0) + #define kvm_printf(kvm, fmt ...) printk(KERN_DEBUG fmt) #define vcpu_printf(vcpu, fmt...) kvm_printf(vcpu->kvm, fmt) diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index 9de3b1aba20f..1b86ab0d42f6 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -962,8 +962,7 @@ static int emulator_write_std(unsigned long addr, unsigned int bytes, struct kvm_vcpu *vcpu) { - printk(KERN_ERR "emulator_write_std: addr %lx n %d\n", - addr, bytes); + pr_unimpl(vcpu, "emulator_write_std: addr %lx n %d\n", addr, bytes); return X86EMUL_UNHANDLEABLE; } @@ -1138,8 +1137,7 @@ int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest) *dest = kvm_arch_ops->get_dr(vcpu, dr); return X86EMUL_CONTINUE; default: - printk(KERN_DEBUG "%s: unexpected dr %u\n", - __FUNCTION__, dr); + pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr); return X86EMUL_UNHANDLEABLE; } } @@ -1488,7 +1486,7 @@ int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata) break; #endif default: - printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr); + pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr); return 1; } *pdata = data; @@ -1543,11 +1541,11 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data) break; #endif case MSR_IA32_MC0_STATUS: - printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n", + pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n", __FUNCTION__, data); break; case MSR_IA32_MCG_STATUS: - printk(KERN_WARNING "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n", + pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n", __FUNCTION__, data); break; case MSR_IA32_UCODE_REV: @@ -1567,7 +1565,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data) return vcpu_register_para(vcpu, data); default: - printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr); + pr_unimpl(vcpu, "unhandled wrmsr: 0x%x\n", msr); return 1; } return 0; @@ -1798,7 +1796,7 @@ int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in, /* * String I/O in reverse. Yuck. Kill the guest, fix later. */ - printk(KERN_ERR "kvm: guest string pio down\n"); + pr_unimpl(vcpu, "guest string pio down\n"); inject_gp(vcpu); return 1; } @@ -1829,7 +1827,7 @@ int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in, ret = 1; } } else if (pio_dev) - printk(KERN_ERR "no string pio read support yet, " + pr_unimpl(vcpu, "no string pio read support yet, " "port %x size %d count %ld\n", port, size, count); diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c index 7beaff1789b1..3ec30d7c9b93 100644 --- a/drivers/kvm/svm.c +++ b/drivers/kvm/svm.c @@ -1167,7 +1167,7 @@ static int invalid_op_interception(struct vcpu_svm *svm, static int task_switch_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) { - printk(KERN_DEBUG "%s: task swiche is unsupported\n", __FUNCTION__); + pr_unimpl(&svm->vcpu, "%s: task switch is unsupported\n", __FUNCTION__); kvm_run->exit_reason = KVM_EXIT_UNKNOWN; return 0; } @@ -1183,7 +1183,7 @@ static int emulate_on_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) { if (emulate_instruction(&svm->vcpu, NULL, 0, 0) != EMULATE_DONE) - printk(KERN_ERR "%s: failed\n", __FUNCTION__); + pr_unimpl(&svm->vcpu, "%s: failed\n", __FUNCTION__); return 1; } diff --git a/drivers/kvm/vmx.c b/drivers/kvm/vmx.c index 3bf36508c84b..ae54d9a24ce8 100644 --- a/drivers/kvm/vmx.c +++ b/drivers/kvm/vmx.c @@ -1920,7 +1920,7 @@ static int handle_cr(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) break; } kvm_run->exit_reason = 0; - printk(KERN_ERR "kvm: unhandled control register: op %d cr %d\n", + pr_unimpl(vcpu, "unhandled control register: op %d cr %d\n", (int)(exit_qualification >> 4) & 3, cr); return 0; } -- 2.20.1