aboutsummaryrefslogtreecommitdiff
path: root/arch/x86/kvm/vmx.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/kvm/vmx.c')
-rw-r--r--arch/x86/kvm/vmx.c131
1 files changed, 66 insertions, 65 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index e65a158dee6..a0d6bd9ad44 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -71,6 +71,9 @@ module_param(vmm_exclusive, bool, S_IRUGO);
static int __read_mostly yield_on_hlt = 1;
module_param(yield_on_hlt, bool, S_IRUGO);
+static int __read_mostly fasteoi = 1;
+module_param(fasteoi, bool, S_IRUGO);
+
/*
* If nested=1, nested virtualization is supported, i.e., guests may use
* VMX and be a hypervisor for its own guests. If nested=0, guests may not
@@ -1748,6 +1751,21 @@ static u64 guest_read_tsc(void)
}
/*
+ * Like guest_read_tsc, but always returns L1's notion of the timestamp
+ * counter, even if a nested guest (L2) is currently running.
+ */
+u64 vmx_read_l1_tsc(struct kvm_vcpu *vcpu)
+{
+ u64 host_tsc, tsc_offset;
+
+ rdtscll(host_tsc);
+ tsc_offset = is_guest_mode(vcpu) ?
+ to_vmx(vcpu)->nested.vmcs01_tsc_offset :
+ vmcs_read64(TSC_OFFSET);
+ return host_tsc + tsc_offset;
+}
+
+/*
* Empty call-back. Needs to be implemented when VMX enables the SET_TSC_KHZ
* ioctl. In this case the call-back should update internal vmx state to make
* the changes effective.
@@ -1762,15 +1780,23 @@ static void vmx_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz)
*/
static void vmx_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
{
- vmcs_write64(TSC_OFFSET, offset);
- if (is_guest_mode(vcpu))
+ if (is_guest_mode(vcpu)) {
/*
- * We're here if L1 chose not to trap the TSC MSR. Since
- * prepare_vmcs12() does not copy tsc_offset, we need to also
- * set the vmcs12 field here.
+ * We're here if L1 chose not to trap WRMSR to TSC. According
+ * to the spec, this should set L1's TSC; The offset that L1
+ * set for L2 remains unchanged, and still needs to be added
+ * to the newly set TSC to get L2's TSC.
*/
- get_vmcs12(vcpu)->tsc_offset = offset -
- to_vmx(vcpu)->nested.vmcs01_tsc_offset;
+ struct vmcs12 *vmcs12;
+ to_vmx(vcpu)->nested.vmcs01_tsc_offset = offset;
+ /* recalculate vmcs02.TSC_OFFSET: */
+ vmcs12 = get_vmcs12(vcpu);
+ vmcs_write64(TSC_OFFSET, offset +
+ (nested_cpu_has(vmcs12, CPU_BASED_USE_TSC_OFFSETING) ?
+ vmcs12->tsc_offset : 0));
+ } else {
+ vmcs_write64(TSC_OFFSET, offset);
+ }
}
static void vmx_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment)
@@ -2736,8 +2762,8 @@ static void enter_lmode(struct kvm_vcpu *vcpu)
guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES);
if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) {
- printk(KERN_DEBUG "%s: tss fixup for long mode. \n",
- __func__);
+ pr_debug_ratelimited("%s: tss fixup for long mode. \n",
+ __func__);
vmcs_write32(GUEST_TR_AR_BYTES,
(guest_tr_ar & ~AR_TYPE_MASK)
| AR_TYPE_BUSY_64_TSS);
@@ -4115,8 +4141,7 @@ static int handle_exception(struct kvm_vcpu *vcpu)
error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
if (is_page_fault(intr_info)) {
/* EPT won't cause page fault directly */
- if (enable_ept)
- BUG();
+ BUG_ON(enable_ept);
cr2 = vmcs_readl(EXIT_QUALIFICATION);
trace_kvm_page_fault(cr2, error_code);
@@ -4518,6 +4543,24 @@ static int handle_xsetbv(struct kvm_vcpu *vcpu)
static int handle_apic_access(struct kvm_vcpu *vcpu)
{
+ if (likely(fasteoi)) {
+ unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
+ int access_type, offset;
+
+ access_type = exit_qualification & APIC_ACCESS_TYPE;
+ offset = exit_qualification & APIC_ACCESS_OFFSET;
+ /*
+ * Sane guest uses MOV to write EOI, with written value
+ * not cared. So make a short-circuit here by avoiding
+ * heavy instruction emulation.
+ */
+ if ((access_type == TYPE_LINEAR_APIC_INST_WRITE) &&
+ (offset == APIC_EOI)) {
+ kvm_lapic_set_eoi(vcpu);
+ skip_emulated_instruction(vcpu);
+ return 1;
+ }
+ }
return emulate_instruction(vcpu, 0) == EMULATE_DONE;
}
@@ -5591,8 +5634,8 @@ static bool nested_vmx_exit_handled(struct kvm_vcpu *vcpu)
return 0;
if (unlikely(vmx->fail)) {
- printk(KERN_INFO "%s failed vm entry %x\n",
- __func__, vmcs_read32(VM_INSTRUCTION_ERROR));
+ pr_info_ratelimited("%s failed vm entry %x\n", __func__,
+ vmcs_read32(VM_INSTRUCTION_ERROR));
return 1;
}
@@ -5696,8 +5739,6 @@ static int vmx_handle_exit(struct kvm_vcpu *vcpu)
u32 exit_reason = vmx->exit_reason;
u32 vectoring_info = vmx->idt_vectoring_info;
- trace_kvm_exit(exit_reason, vcpu, KVM_ISA_VMX);
-
/* If guest state is invalid, start emulating */
if (vmx->emulation_required && emulate_invalid_guest_state)
return handle_invalid_guest_state(vcpu);
@@ -6101,6 +6142,7 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
vmx->loaded_vmcs->launched = 1;
vmx->exit_reason = vmcs_read32(VM_EXIT_REASON);
+ trace_kvm_exit(vmx->exit_reason, vcpu, KVM_ISA_VMX);
vmx_complete_atomic_exit(vmx);
vmx_recover_nmi_blocking(vmx);
@@ -6241,49 +6283,6 @@ static u64 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
return ret;
}
-#define _ER(x) { EXIT_REASON_##x, #x }
-
-static const struct trace_print_flags vmx_exit_reasons_str[] = {
- _ER(EXCEPTION_NMI),
- _ER(EXTERNAL_INTERRUPT),
- _ER(TRIPLE_FAULT),
- _ER(PENDING_INTERRUPT),
- _ER(NMI_WINDOW),
- _ER(TASK_SWITCH),
- _ER(CPUID),
- _ER(HLT),
- _ER(INVLPG),
- _ER(RDPMC),
- _ER(RDTSC),
- _ER(VMCALL),
- _ER(VMCLEAR),
- _ER(VMLAUNCH),
- _ER(VMPTRLD),
- _ER(VMPTRST),
- _ER(VMREAD),
- _ER(VMRESUME),
- _ER(VMWRITE),
- _ER(VMOFF),
- _ER(VMON),
- _ER(CR_ACCESS),
- _ER(DR_ACCESS),
- _ER(IO_INSTRUCTION),
- _ER(MSR_READ),
- _ER(MSR_WRITE),
- _ER(MWAIT_INSTRUCTION),
- _ER(MONITOR_INSTRUCTION),
- _ER(PAUSE_INSTRUCTION),
- _ER(MCE_DURING_VMENTRY),
- _ER(TPR_BELOW_THRESHOLD),
- _ER(APIC_ACCESS),
- _ER(EPT_VIOLATION),
- _ER(EPT_MISCONFIG),
- _ER(WBINVD),
- { -1, NULL }
-};
-
-#undef _ER
-
static int vmx_get_lpage_level(void)
{
if (enable_ept && !cpu_has_vmx_ept_1g_page())
@@ -6514,8 +6513,11 @@ static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
set_cr4_guest_host_mask(vmx);
- vmcs_write64(TSC_OFFSET,
- vmx->nested.vmcs01_tsc_offset + vmcs12->tsc_offset);
+ if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETING)
+ vmcs_write64(TSC_OFFSET,
+ vmx->nested.vmcs01_tsc_offset + vmcs12->tsc_offset);
+ else
+ vmcs_write64(TSC_OFFSET, vmx->nested.vmcs01_tsc_offset);
if (enable_vpid) {
/*
@@ -6610,9 +6612,8 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
if (vmcs12->vm_entry_msr_load_count > 0 ||
vmcs12->vm_exit_msr_load_count > 0 ||
vmcs12->vm_exit_msr_store_count > 0) {
- if (printk_ratelimit())
- printk(KERN_WARNING
- "%s: VMCS MSR_{LOAD,STORE} unsupported\n", __func__);
+ pr_warn_ratelimited("%s: VMCS MSR_{LOAD,STORE} unsupported\n",
+ __func__);
nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
return 1;
}
@@ -6922,7 +6923,7 @@ static void nested_vmx_vmexit(struct kvm_vcpu *vcpu)
load_vmcs12_host_state(vcpu, vmcs12);
- /* Update TSC_OFFSET if vmx_adjust_tsc_offset() was used while L2 ran */
+ /* Update TSC_OFFSET if TSC was changed while L2 ran */
vmcs_write64(TSC_OFFSET, vmx->nested.vmcs01_tsc_offset);
/* This is needed for same reason as it was needed in prepare_vmcs02 */
@@ -7039,7 +7040,6 @@ static struct kvm_x86_ops vmx_x86_ops = {
.get_mt_mask = vmx_get_mt_mask,
.get_exit_info = vmx_get_exit_info,
- .exit_reasons_str = vmx_exit_reasons_str,
.get_lpage_level = vmx_get_lpage_level,
@@ -7055,6 +7055,7 @@ static struct kvm_x86_ops vmx_x86_ops = {
.write_tsc_offset = vmx_write_tsc_offset,
.adjust_tsc_offset = vmx_adjust_tsc_offset,
.compute_tsc_offset = vmx_compute_tsc_offset,
+ .read_l1_tsc = vmx_read_l1_tsc,
.set_tdp_cr3 = vmx_set_cr3,
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-15 06:18:21 +0000