From 9ac7e3e815060efdc86b6d12448200e3c3597e01 Mon Sep 17 00:00:00 2001 From: Jan Dakinevich Date: Sun, 4 Sep 2016 21:23:15 +0300 Subject: [PATCH] KVM: nVMX: expose INS/OUTS information support Expose the feature to L1 hypervisor if host CPU supports it, since certain hypervisors requires it for own purposes. According to Intel SDM A.1, if CPU supports the feature, VMX_INSTRUCTION_INFO field of VMCS will contain detailed information about INS/OUTS instructions handling. This field is already copied to VMCS12 for L1 hypervisor (see prepare_vmcs12 routine) independently feature presence. Signed-off-by: Jan Dakinevich Signed-off-by: Paolo Bonzini --- arch/x86/kvm/vmx.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 2d584d9..f9939d0 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -939,6 +939,7 @@ static DEFINE_SPINLOCK(vmx_vpid_lock); static struct vmcs_config { int size; int order; + u32 basic_cap; u32 revision_id; u32 pin_based_exec_ctrl; u32 cpu_based_exec_ctrl; @@ -1215,6 +1216,11 @@ static inline bool cpu_has_vmx_ple(void) SECONDARY_EXEC_PAUSE_LOOP_EXITING; } +static inline bool cpu_has_vmx_basic_inout(void) +{ + return (((u64)vmcs_config.basic_cap << 32) & VMX_BASIC_INOUT); +} + static inline bool cpu_need_virtualize_apic_accesses(struct kvm_vcpu *vcpu) { return flexpriority_enabled && lapic_in_kernel(vcpu); @@ -2877,6 +2883,8 @@ static int vmx_get_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata) *pdata = VMCS12_REVISION | VMX_BASIC_TRUE_CTLS | ((u64)VMCS12_SIZE << VMX_BASIC_VMCS_SIZE_SHIFT) | (VMX_BASIC_MEM_TYPE_WB << VMX_BASIC_MEM_TYPE_SHIFT); + if (cpu_has_vmx_basic_inout()) + *pdata |= VMX_BASIC_INOUT; break; case MSR_IA32_VMX_TRUE_PINBASED_CTLS: case MSR_IA32_VMX_PINBASED_CTLS: @@ -3458,6 +3466,7 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf) vmcs_conf->size = vmx_msr_high & 0x1fff; vmcs_conf->order = get_order(vmcs_conf->size); + vmcs_conf->basic_cap = vmx_msr_high & ~0x1fff; vmcs_conf->revision_id = vmx_msr_low; vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control; -- 2.7.4