[PATCH v6 7/7] KVM: nVMX: Return -EINVAL when signaling failure in VM-Entry helpers

Sean Christopherson
2019-04-11T19:18:14Z

Most, but not all, helpers that are related to emulating consistency
checks for nested VM-Entry return -EINVAL when a check fails. Convert
the holdouts to have consistency throughout and to make it clear that
the functions are signaling pass/fail as opposed to "resume guest" vs.
"exit to userspace".

Opportunistically fix bad indentation in nested_vmx_check_guest_state().

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
arch/x86/kvm/vmx/nested.c | 24 ++++++++++++------------
1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 98afbe7c15a1..b8b74a73e00b 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -917,7 +917,7 @@ static int nested_vmx_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3, bool ne
if (cr3 != kvm_read_cr3(vcpu) || (!nested_ept && pdptrs_changed(vcpu))) {
if (!nested_cr3_valid(vcpu, cr3)) {
*entry_failure_code = ENTRY_FAIL_DEFAULT;
- return 1;
+ return -EINVAL;
}

/*
@@ -928,7 +928,7 @@ static int nested_vmx_load_cr3(struct kvm_vcpu *vcpu, unsigned long cr3, bool ne
!nested_ept) {
if (!load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3)) {
*entry_failure_code = ENTRY_FAIL_PDPTE;
- return 1;
+ return -EINVAL;
}
}
}
@@ -2360,13 +2360,13 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
*/
if (vmx->emulation_required) {
*entry_failure_code = ENTRY_FAIL_DEFAULT;
- return 1;
+ return -EINVAL;
}

/* Shadow page tables on either EPT or shadow page tables. */
if (nested_vmx_load_cr3(vcpu, vmcs12->guest_cr3, nested_cpu_has_ept(vmcs12),
entry_failure_code))
- return 1;
+ return -EINVAL;

if (!enable_ept)
vcpu->arch.walk_mmu->inject_page_fault = vmx_inject_page_fault_nested;
@@ -2678,15 +2678,15 @@ static int nested_vmx_check_guest_state(struct kvm_vcpu *vcpu,

if (!nested_guest_cr0_valid(vcpu, vmcs12->guest_cr0) ||
!nested_guest_cr4_valid(vcpu, vmcs12->guest_cr4))
- return 1;
+ return -EINVAL;

if ((vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PAT) &&
!kvm_mtrr_valid(vcpu, MSR_IA32_CR_PAT, vmcs12->guest_ia32_pat))
- return 1;
+ return -EINVAL;

if (nested_vmx_check_vmcs_link_ptr(vcpu, vmcs12)) {
*exit_qual = ENTRY_FAIL_VMCS_LINK_PTR;
- return 1;
+ return -EINVAL;
}

/*
@@ -2705,16 +2705,16 @@ static int nested_vmx_check_guest_state(struct kvm_vcpu *vcpu,
ia32e != !!(vmcs12->guest_ia32_efer & EFER_LMA) ||
((vmcs12->guest_cr0 & X86_CR0_PG) &&
ia32e != !!(vmcs12->guest_ia32_efer & EFER_LME)))
- return 1;
+ return -EINVAL;
}

if ((vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS) &&
- (is_noncanonical_address(vmcs12->guest_bndcfgs & PAGE_MASK, vcpu) ||
- (vmcs12->guest_bndcfgs & MSR_IA32_BNDCFGS_RSVD)))
- return 1;
+ (is_noncanonical_address(vmcs12->guest_bndcfgs & PAGE_MASK, vcpu) ||
+ (vmcs12->guest_bndcfgs & MSR_IA32_BNDCFGS_RSVD)))
+ return -EINVAL;

if (nested_check_guest_non_reg_state(vmcs12))
- return 1;
+ return -EINVAL;

return 0;
}
--
2.21.0