diff mbox series

[v4,12/25] KVM: VMX: Check VM_ENTRY_IA32E_MODE in setup_vmcs_config()

Message ID 20220714091327.1085353-13-vkuznets@redhat.com (mailing list archive)
State New, archived
Headers show
Series KVM: VMX: Support updated eVMCSv1 revision + use vmcs_config for L1 VMX MSRs | expand

Commit Message

Vitaly Kuznetsov July 14, 2022, 9:13 a.m. UTC 
VM_ENTRY_IA32E_MODE control is toggled dynamically by vmx_set_efer()
and setup_vmcs_config() doesn't check its existence. On the contrary,
nested_vmx_setup_ctls_msrs() doesn set it on x86_64. Add the missing
check and filter the bit out in vmx_vmentry_ctrl().

No (real) functional change intended as all existing CPUs supporting
long mode and VMX are supposed to have it.

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
 arch/x86/kvm/vmx/vmx.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

Comments

Sean Christopherson July 21, 2022, 10 p.m. UTC | #1 
On Thu, Jul 14, 2022, Vitaly Kuznetsov wrote:
> VM_ENTRY_IA32E_MODE control is toggled dynamically by vmx_set_efer()
> and setup_vmcs_config() doesn't check its existence. On the contrary,
> nested_vmx_setup_ctls_msrs() doesn set it on x86_64. Add the missing
> check and filter the bit out in vmx_vmentry_ctrl().
> 
> No (real) functional change intended as all existing CPUs supporting
> long mode and VMX are supposed to have it.
> 
> Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
> Reviewed-by: Jim Mattson <jmattson@google.com>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
> ---

Reviewed-by: Sean Christopherson <seanjc@google.com>
diff mbox series

Patch

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index dd905ad72637..1aaec4d19e1b 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -2610,6 +2610,9 @@  static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf,
 		_pin_based_exec_control &= ~PIN_BASED_POSTED_INTR;
 
 	min = VM_ENTRY_LOAD_DEBUG_CONTROLS;
+#ifdef CONFIG_X86_64
+	min |= VM_ENTRY_IA32E_MODE;
+#endif
 	opt = VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL |
 	      VM_ENTRY_LOAD_IA32_PAT |
 	      VM_ENTRY_LOAD_IA32_EFER |
@@ -4242,9 +4245,14 @@  static u32 vmx_vmentry_ctrl(void)
 	if (vmx_pt_mode_is_system())
 		vmentry_ctrl &= ~(VM_ENTRY_PT_CONCEAL_PIP |
 				  VM_ENTRY_LOAD_IA32_RTIT_CTL);
-	/* Loading of EFER and PERF_GLOBAL_CTRL are toggled dynamically */
-	return vmentry_ctrl &
-		~(VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL | VM_ENTRY_LOAD_IA32_EFER);
+	/*
+	 * IA32e mode, and loading of EFER and PERF_GLOBAL_CTRL are toggled dynamically.
+	 */
+	vmentry_ctrl &= ~(VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL |
+			  VM_ENTRY_LOAD_IA32_EFER |
+			  VM_ENTRY_IA32E_MODE);
+
+	return vmentry_ctrl;
 }
 
 static u32 vmx_vmexit_ctrl(void)