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KVM: nVMX: Return -EINVAL when signaling failure in pre-VM-Entry helpers

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Convert all top-level nested VM-Enter consistency check functions to
return 0/-EINVAL instead of failure codes, since now they can only
ever return one failure code.

This also does not give the false impression that failure information is
always consumed and/or relevant, e.g. vmx_set_nested_state() only
cares whether or not the checks were successful.

nested_check_host_control_regs() can also now be inlined into its caller,
nested_vmx_check_host_state, since the two have effectively become the
same function.

Based on a patch by Sean Christopherson.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2019-04-12 10:19:57 +02:00
parent 5478ba349f
commit 98d9e858fa
1 changed files with 7 additions and 21 deletions
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28
arch/x86/kvm/vmx/nested.c
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@ -2595,16 +2595,13 @@ static int nested_vmx_check_controls(struct kvm_vcpu *vcpu,
if (nested_check_vm_execution_controls(vcpu, vmcs12) ||
nested_check_vm_exit_controls(vcpu, vmcs12) ||
nested_check_vm_entry_controls(vcpu, vmcs12))
return VMXERR_ENTRY_INVALID_CONTROL_FIELD;
return -EINVAL;
return 0;
}
/*
* Checks related to Host Control Registers and MSRs
*/
static int nested_check_host_control_regs(struct kvm_vcpu *vcpu,
struct vmcs12 *vmcs12)
static int nested_vmx_check_host_state(struct kvm_vcpu *vcpu,
struct vmcs12 *vmcs12)
{
bool ia32e;
@ -2639,15 +2636,6 @@ static int nested_check_host_control_regs(struct kvm_vcpu *vcpu,
return 0;
}
static int nested_vmx_check_host_state(struct kvm_vcpu *vcpu,
struct vmcs12 *vmcs12)
{
if (nested_check_host_control_regs(vcpu, vmcs12))
return VMXERR_ENTRY_INVALID_HOST_STATE_FIELD;
return 0;
}
static int nested_vmx_check_vmcs_link_ptr(struct kvm_vcpu *vcpu,
struct vmcs12 *vmcs12)
{
@ -3159,13 +3147,11 @@ static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
launch ? VMXERR_VMLAUNCH_NONCLEAR_VMCS
: VMXERR_VMRESUME_NONLAUNCHED_VMCS);
ret = nested_vmx_check_controls(vcpu, vmcs12);
if (ret)
return nested_vmx_failValid(vcpu, ret);
if (nested_vmx_check_controls(vcpu, vmcs12))
return nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
ret = nested_vmx_check_host_state(vcpu, vmcs12);
if (ret)
return nested_vmx_failValid(vcpu, ret);
if (nested_vmx_check_host_state(vcpu, vmcs12))
return nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_HOST_STATE_FIELD);
/*
* We're finally done with prerequisite checking, and can start with