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KVM: vmx: Enable VMFUNCs 

Enable VMFUNC in the secondary execution controls.  This simplifies the
changes necessary to expose it to nested hypervisors.  VMFUNCs still
cause #UD when invoked.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Bandan Das <bsd@redhat.com>
Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Bandan Das 2017-08-03 15:54:41 -04:00 committed by Paolo Bonzini
parent 53a70daf3c
commit 2a499e49c2
2 changed files with 24 additions and 1 deletions
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3
arch/x86/include/asm/vmx.h
View File

@ -72,6 +72,7 @@
#define SECONDARY_EXEC_PAUSE_LOOP_EXITING 0x00000400
#define SECONDARY_EXEC_RDRAND 0x00000800
#define SECONDARY_EXEC_ENABLE_INVPCID 0x00001000
#define SECONDARY_EXEC_ENABLE_VMFUNC 0x00002000
#define SECONDARY_EXEC_SHADOW_VMCS 0x00004000
#define SECONDARY_EXEC_RDSEED 0x00010000
#define SECONDARY_EXEC_ENABLE_PML 0x00020000
@ -187,6 +188,8 @@ enum vmcs_field {
APIC_ACCESS_ADDR_HIGH = 0x00002015,
POSTED_INTR_DESC_ADDR = 0x00002016,
POSTED_INTR_DESC_ADDR_HIGH = 0x00002017,
VM_FUNCTION_CONTROL = 0x00002018,
VM_FUNCTION_CONTROL_HIGH = 0x00002019,
EPT_POINTER = 0x0000201a,
EPT_POINTER_HIGH = 0x0000201b,
EOI_EXIT_BITMAP0 = 0x0000201c,

22
arch/x86/kvm/vmx.c
View File

@ -1300,6 +1300,12 @@ static inline bool cpu_has_vmx_tsc_scaling(void)
SECONDARY_EXEC_TSC_SCALING;
}
static inline bool cpu_has_vmx_vmfunc(void)
{
return vmcs_config.cpu_based_2nd_exec_ctrl &
SECONDARY_EXEC_ENABLE_VMFUNC;
}
static inline bool report_flexpriority(void)
{
return flexpriority_enabled;
@ -3628,7 +3634,8 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
SECONDARY_EXEC_SHADOW_VMCS |
SECONDARY_EXEC_XSAVES |
SECONDARY_EXEC_ENABLE_PML |
SECONDARY_EXEC_TSC_SCALING;
SECONDARY_EXEC_TSC_SCALING |
SECONDARY_EXEC_ENABLE_VMFUNC;
if (adjust_vmx_controls(min2, opt2,
MSR_IA32_VMX_PROCBASED_CTLS2,
&_cpu_based_2nd_exec_control) < 0)
@ -5345,6 +5352,9 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */
#endif
if (cpu_has_vmx_vmfunc())
vmcs_write64(VM_FUNCTION_CONTROL, 0);
vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0);
vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0);
vmcs_write64(VM_EXIT_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.host));
@ -7835,6 +7845,12 @@ static int handle_preemption_timer(struct kvm_vcpu *vcpu)
return 1;
}
static int handle_vmfunc(struct kvm_vcpu *vcpu)
{
kvm_queue_exception(vcpu, UD_VECTOR);
return 1;
}
/*
* The exit handlers return 1 if the exit was handled fully and guest execution
* may resume. Otherwise they set the kvm_run parameter to indicate what needs
@ -7885,6 +7901,7 @@ static int (*const kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
[EXIT_REASON_XSAVES] = handle_xsaves,
[EXIT_REASON_XRSTORS] = handle_xrstors,
[EXIT_REASON_PML_FULL] = handle_pml_full,
[EXIT_REASON_VMFUNC] = handle_vmfunc,
[EXIT_REASON_PREEMPTION_TIMER] = handle_preemption_timer,
};
@ -8221,6 +8238,9 @@ static bool nested_vmx_exit_reflected(struct kvm_vcpu *vcpu, u32 exit_reason)
case EXIT_REASON_PML_FULL:
/* We emulate PML support to L1. */
return false;
case EXIT_REASON_VMFUNC:
/* VM functions are emulated through L2->L0 vmexits. */
return false;
default:
return true;
}