Oops, ignore this message, I responded to the wrong email. -- Don Dugger "Censeo Toto nos in Kansa esse decisse." - D. Gale Ph: 303/443-3786 -----Original Message----- From: Dugger, Donald D Sent: Monday, October 29, 2012 4:38 PM To: Auld, Will; mtosatti@xxxxxxxxxx; avi@xxxxxxxxxx; Zhang, Xiantao; kvm@xxxxxxxxxxxxxxx; Liu, Jinsong Subject: RE: [PATCH] Add code to track call origin for msr assignment. Will- To quote from the OpenStack documentation (`http://docs.openstack.org/essex/openstack-compute/admin/content/introduction-to-xen.html') "It is possible to manage Xen using libvirt. This would be necessary for any Xen-based system that isn't using the XCP toolstack, such as SUSE Linux or Oracle Linux. Unfortunately, this is not well tested or supported as of the Essex release. To experiment using Xen through libvirt add the following configuration options /etc/nova/nova.conf: connection_type=libvirt libvirt_type=xen" I'm guessing the people who do most of the testing/deployment on Xen are xenapi centric and that's just what they use. -- Don Dugger "Censeo Toto nos in Kansa esse decisse." - D. Gale Ph: 303/443-3786 -----Original Message----- From: Will Auld [mailto:will.auld.intel@xxxxxxxxx] Sent: Monday, October 29, 2012 3:18 PM To: mtosatti@xxxxxxxxxx; avi@xxxxxxxxxx; Zhang, Xiantao; kvm@xxxxxxxxxxxxxxx; Liu, Jinsong; Dugger, Donald D Cc: Auld, Will Subject: [PATCH] Add code to track call origin for msr assignment. In order to track who initiated the call (host or guest) to modify an msr value I have changed function call parameters along the call path. The specific change is to add a struct pointer parameter that points to (index, data, caller) information rather than having this information passed as individual parameters. The initial use for this capability is for updating the IA32_TSC_ADJUST msr while setting the tsc value. It is anticipated that this capability is useful for other tasks. Signed-off-by: Will Auld <will.auld@xxxxxxxxx> --- arch/x86/include/asm/kvm_host.h | 18 +++++++++++++++--- arch/x86/kvm/svm.c | 21 +++++++++++++++------ arch/x86/kvm/vmx.c | 24 +++++++++++++++++------- arch/x86/kvm/x86.c | 23 +++++++++++++++++------ arch/x86/kvm/x86.h | 2 +- 5 files changed, 65 insertions(+), 23 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 09155d6..ad0d3fd 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -598,6 +598,18 @@ struct kvm_vcpu_stat { struct x86_instruction_info; +/* + * Defined values for msr_data.initiated_by + */ +#define KVM_GUEST_INITIATED 0x1 +#define KVM_HOST_INITIATED 0x2 + +struct msr_data { + u32 initiated_by; + u32 index; + u64 data; +}; + struct kvm_x86_ops { int (*cpu_has_kvm_support)(void); /* __init */ int (*disabled_by_bios)(void); /* __init */ @@ -621,7 +633,7 @@ struct kvm_x86_ops { void (*set_guest_debug)(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg); int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata); - int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data); + int (*set_msr)(struct kvm_vcpu *vcpu, struct msr_data *msr); u64 (*get_segment_base)(struct kvm_vcpu *vcpu, int seg); void (*get_segment)(struct kvm_vcpu *vcpu, struct kvm_segment *var, int seg); @@ -772,7 +784,7 @@ static inline int emulate_instruction(struct kvm_vcpu *vcpu, void kvm_enable_efer_bits(u64); int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *data); -int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data); +int kvm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr); struct x86_emulate_ctxt; @@ -799,7 +811,7 @@ void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l); int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr); int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata); -int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data); +int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr); unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu); void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags); diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index baead95..584055b 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -1211,6 +1211,7 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id) struct page *msrpm_pages; struct page *hsave_page; struct page *nested_msrpm_pages; + struct msr_data msr; int err; svm = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL); @@ -1255,7 +1256,10 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id) svm->vmcb_pa = page_to_pfn(page) << PAGE_SHIFT; svm->asid_generation = 0; init_vmcb(svm); - kvm_write_tsc(&svm->vcpu, 0); + msr.data = 0x0; + msr.index = MSR_IA32_TSC; + msr.initiated_by = KVM_HOST_INITIATED; + kvm_write_tsc(&svm->vcpu, &msr); err = fx_init(&svm->vcpu); if (err) @@ -3147,13 +3151,15 @@ static int svm_set_vm_cr(struct kvm_vcpu *vcpu, u64 data) return 0; } -static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data) +static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr) { struct vcpu_svm *svm = to_svm(vcpu); + u32 ecx = msr->index; + u64 data = msr->data; switch (ecx) { case MSR_IA32_TSC: - kvm_write_tsc(vcpu, data); + kvm_write_tsc(vcpu, msr); break; case MSR_STAR: svm->vmcb->save.star = data; @@ -3208,20 +3214,23 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data) vcpu_unimpl(vcpu, "unimplemented wrmsr: 0x%x data 0x%llx\n", ecx, data); break; default: - return kvm_set_msr_common(vcpu, ecx, data); + return kvm_set_msr_common(vcpu, msr); } return 0; } static int wrmsr_interception(struct vcpu_svm *svm) { + struct msr_data msr; u32 ecx = svm->vcpu.arch.regs[VCPU_REGS_RCX]; u64 data = (svm->vcpu.arch.regs[VCPU_REGS_RAX] & -1u) | ((u64)(svm->vcpu.arch.regs[VCPU_REGS_RDX] & -1u) << 32); - + msr.data = data; + msr.index = ecx; + msr.initiated_by = KVM_GUEST_INITIATED; svm->next_rip = kvm_rip_read(&svm->vcpu) + 2; - if (svm_set_msr(&svm->vcpu, ecx, data)) { + if (svm_set_msr(&svm->vcpu, &msr)) { trace_kvm_msr_write_ex(ecx, data); kvm_inject_gp(&svm->vcpu, 0); } else { diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index c00f03d..f4bb3a4 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -2197,15 +2197,17 @@ static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata) * Returns 0 on success, non-0 otherwise. * Assumes vcpu_load() was already called. */ -static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) +static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) { struct vcpu_vmx *vmx = to_vmx(vcpu); struct shared_msr_entry *msr; int ret = 0; + u32 msr_index = msr_info->index; + u64 data = msr_info->data; switch (msr_index) { case MSR_EFER: - ret = kvm_set_msr_common(vcpu, msr_index, data); + ret = kvm_set_msr_common(vcpu, msr_info); break; #ifdef CONFIG_X86_64 case MSR_FS_BASE: @@ -2231,7 +2233,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) vmcs_writel(GUEST_SYSENTER_ESP, data); break; case MSR_IA32_TSC: - kvm_write_tsc(vcpu, data); + kvm_write_tsc(vcpu, msr_info); break; case MSR_IA32_CR_PAT: if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) { @@ -2239,7 +2241,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) vcpu->arch.pat = data; break; } - ret = kvm_set_msr_common(vcpu, msr_index, data); + ret = kvm_set_msr_common(vcpu, msr_info); break; case MSR_TSC_AUX: if (!vmx->rdtscp_enabled) @@ -2262,7 +2264,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) } break; } - ret = kvm_set_msr_common(vcpu, msr_index, data); + ret = kvm_set_msr_common(vcpu, msr_info); } return ret; @@ -3835,6 +3837,7 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx) unsigned long a; #endif int i; + struct msr_data msr; /* I/O */ vmcs_write64(IO_BITMAP_A, __pa(vmx_io_bitmap_a)); @@ -3918,7 +3921,10 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx) vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL); set_cr4_guest_host_mask(vmx); - kvm_write_tsc(&vmx->vcpu, 0); + msr.data = 0x0; + msr.index = MSR_IA32_TSC; + msr.initiated_by = KVM_HOST_INITIATED; + kvm_write_tsc(&vmx->vcpu, &msr); return 0; } @@ -4649,11 +4655,15 @@ static int handle_rdmsr(struct kvm_vcpu *vcpu) static int handle_wrmsr(struct kvm_vcpu *vcpu) { + struct msr_data msr; u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX]; u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u) | ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32); - if (vmx_set_msr(vcpu, ecx, data) != 0) { + msr.data = data; + msr.index = ecx; + msr.initiated_by = KVM_GUEST_INITIATED; + if (vmx_set_msr(vcpu, &msr) != 0) { trace_kvm_msr_write_ex(ecx, data); kvm_inject_gp(vcpu, 0); return 1; diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 42bce48..13f7afa 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -883,9 +883,9 @@ EXPORT_SYMBOL_GPL(kvm_enable_efer_bits); * Returns 0 on success, non-0 otherwise. * Assumes vcpu_load() was already called. */ -int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) +int kvm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr) { - return kvm_x86_ops->set_msr(vcpu, msr_index, data); + return kvm_x86_ops->set_msr(vcpu, msr); } /* @@ -893,7 +893,11 @@ int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) */ static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data) { - return kvm_set_msr(vcpu, index, *data); + struct msr_data msr; + msr.data = *data; + msr.index = index; + msr.initiated_by = KVM_HOST_INITIATED; + return kvm_set_msr(vcpu, &msr); } static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock) @@ -1043,12 +1047,13 @@ static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns) return tsc; } -void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data) +void kvm_write_tsc(struct kvm_vcpu *vcpu, struct msr_data *msr) { struct kvm *kvm = vcpu->kvm; u64 offset, ns, elapsed; unsigned long flags; s64 usdiff; + u64 data = msr->data; raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags); offset = kvm_x86_ops->compute_tsc_offset(vcpu, data); @@ -1561,9 +1566,11 @@ static void record_steal_time(struct kvm_vcpu *vcpu) &vcpu->arch.st.steal, sizeof(struct kvm_steal_time)); } -int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data) +int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info) { bool pr = false; + u32 msr = msr_info->index; + u64 data = msr_info->data; switch (msr) { case MSR_EFER: @@ -4286,7 +4293,11 @@ static int emulator_get_msr(struct x86_emulate_ctxt *ctxt, static int emulator_set_msr(struct x86_emulate_ctxt *ctxt, u32 msr_index, u64 data) { - return kvm_set_msr(emul_to_vcpu(ctxt), msr_index, data); + struct msr_data msr; + msr.data = data; + msr.index = msr_index; + msr.initiated_by = KVM_HOST_INITIATED; + return kvm_set_msr(emul_to_vcpu(ctxt), &msr); } static int emulator_read_pmc(struct x86_emulate_ctxt *ctxt, diff --git a/arch/x86/kvm/x86.h b/arch/x86/kvm/x86.h index 3d1134d..1dcb8e3 100644 --- a/arch/x86/kvm/x86.h +++ b/arch/x86/kvm/x86.h @@ -112,7 +112,7 @@ void kvm_before_handle_nmi(struct kvm_vcpu *vcpu); void kvm_after_handle_nmi(struct kvm_vcpu *vcpu); int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip); -void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data); +void kvm_write_tsc(struct kvm_vcpu *vcpu, struct msr_data *msr); int kvm_read_guest_virt(struct x86_emulate_ctxt *ctxt, gva_t addr, void *val, unsigned int bytes, -- 1.8.0.rc0 ��.n��������+%������w��{.n�����o�^n�r������&��z�ޗ�zf���h���~����������_��+v���)ߣ�
