From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Sean Christopherson <sean.j.christopherson@intel.com>,
Jim Mattson <jmattson@google.com>,
Krish Sadhukhan <krish.sadhukhan@oracle.com>
Subject: [PATCH] KVM: nVMX: cleanup and fix host 64-bit mode checks
Date: Wed, 25 Sep 2019 18:34:46 +0200 [thread overview]
Message-ID: <1569429286-35157-1-git-send-email-pbonzini@redhat.com> (raw)
KVM was incorrectly checking vmcs12->host_ia32_efer even if the "load
IA32_EFER" exit control was reset. Also, some checks were not using
the new CC macro for tracing.
Cleanup everything so that the vCPU's 64-bit mode is determined
directly from EFER_LMA and the VMCS checks are based on that, which
matches section 26.2.4 of the SDM.
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Jim Mattson <jmattson@google.com>
Cc: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Fixes: 5845038c111db27902bc220a4f70070fe945871c
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/vmx/nested.c | 53 ++++++++++++++++++++---------------------------
1 file changed, 22 insertions(+), 31 deletions(-)
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 70d59d9304f2..e108847f6cf8 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -2664,8 +2664,26 @@ static int nested_vmx_check_host_state(struct kvm_vcpu *vcpu,
CC(!kvm_pat_valid(vmcs12->host_ia32_pat)))
return -EINVAL;
- ia32e = (vmcs12->vm_exit_controls &
- VM_EXIT_HOST_ADDR_SPACE_SIZE) != 0;
+#ifdef CONFIG_X86_64
+ ia32e = !!(vcpu->arch.efer & EFER_LMA);
+#else
+ if (CC(vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE))
+ return -EINVAL;
+
+ ia32e = false;
+#endif
+
+ if (ia32e) {
+ if (CC(!(vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE)) ||
+ CC(!(vmcs12->host_cr4 & X86_CR4_PAE)))
+ return -EINVAL;
+ } else {
+ if (CC(vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE) ||
+ CC(vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE) ||
+ CC(vmcs12->host_cr4 & X86_CR4_PCIDE) ||
+ CC(((vmcs12->host_rip) >> 32) & 0xffffffff))
+ return -EINVAL;
+ }
if (CC(vmcs12->host_cs_selector & (SEGMENT_RPL_MASK | SEGMENT_TI_MASK)) ||
CC(vmcs12->host_ss_selector & (SEGMENT_RPL_MASK | SEGMENT_TI_MASK)) ||
@@ -2684,35 +2702,8 @@ static int nested_vmx_check_host_state(struct kvm_vcpu *vcpu,
CC(is_noncanonical_address(vmcs12->host_gs_base, vcpu)) ||
CC(is_noncanonical_address(vmcs12->host_gdtr_base, vcpu)) ||
CC(is_noncanonical_address(vmcs12->host_idtr_base, vcpu)) ||
- CC(is_noncanonical_address(vmcs12->host_tr_base, vcpu)))
- return -EINVAL;
-
- if (!(vmcs12->host_ia32_efer & EFER_LMA) &&
- ((vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE) ||
- (vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE))) {
- return -EINVAL;
- }
-
- if ((vmcs12->host_ia32_efer & EFER_LMA) &&
- !(vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE)) {
- return -EINVAL;
- }
-
- if (!(vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE) &&
- ((vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE) ||
- (vmcs12->host_cr4 & X86_CR4_PCIDE) ||
- (((vmcs12->host_rip) >> 32) & 0xffffffff))) {
- return -EINVAL;
- }
-
- if ((vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE) &&
- ((!(vmcs12->host_cr4 & X86_CR4_PAE)) ||
- (is_noncanonical_address(vmcs12->host_rip, vcpu)))) {
- return -EINVAL;
- }
-#else
- if (vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE ||
- vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE)
+ CC(is_noncanonical_address(vmcs12->host_tr_base, vcpu)) ||
+ CC(is_noncanonical_address(vmcs12->host_rip, vcpu)))
return -EINVAL;
#endif
--
1.8.3.1
next reply other threads:[~2019-09-25 16:34 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-25 16:34 Paolo Bonzini [this message]
2019-09-25 16:47 ` Jim Mattson
2019-09-25 23:55 ` Krish Sadhukhan
2019-09-26 8:42 ` Paolo Bonzini
2019-09-26 11:31 ` Liran Alon
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