KVM: nVMX: Advertise support for MSR_IA32_VMX_TRUE_*_CTLS
We already implemented them but failed to advertise them. Currently they
all return the identical values to the capability MSRs they are
augmenting. So there is no change in exposed features yet.
Drop related comments at this chance that are partially incorrect and
redundant anyway.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/arch/x86/include/uapi/asm/msr-index.h b/arch/x86/include/uapi/asm/msr-index.h
index fcf2b3a..eaefcc6 100644
--- a/arch/x86/include/uapi/asm/msr-index.h
+++ b/arch/x86/include/uapi/asm/msr-index.h
@@ -558,6 +558,7 @@
/* VMX_BASIC bits and bitmasks */
#define VMX_BASIC_VMCS_SIZE_SHIFT 32
+#define VMX_BASIC_TRUE_CTLS (1ULL << 55)
#define VMX_BASIC_64 0x0001000000000000LLU
#define VMX_BASIC_MEM_TYPE_SHIFT 50
#define VMX_BASIC_MEM_TYPE_MASK 0x003c000000000000LLU
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 4f84be0..31379fa 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2265,21 +2265,13 @@
/* pin-based controls */
rdmsr(MSR_IA32_VMX_PINBASED_CTLS,
nested_vmx_pinbased_ctls_low, nested_vmx_pinbased_ctls_high);
- /*
- * According to the Intel spec, if bit 55 of VMX_BASIC is off (as it is
- * in our case), bits 1, 2 and 4 (i.e., 0x16) must be 1 in this MSR.
- */
nested_vmx_pinbased_ctls_low |= PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR;
nested_vmx_pinbased_ctls_high &= PIN_BASED_EXT_INTR_MASK |
PIN_BASED_NMI_EXITING | PIN_BASED_VIRTUAL_NMIS;
nested_vmx_pinbased_ctls_high |= PIN_BASED_ALWAYSON_WITHOUT_TRUE_MSR |
PIN_BASED_VMX_PREEMPTION_TIMER;
- /*
- * Exit controls
- * If bit 55 of VMX_BASIC is off, bits 0-8 and 10, 11, 13, 14, 16 and
- * 17 must be 1.
- */
+ /* exit controls */
rdmsr(MSR_IA32_VMX_EXIT_CTLS,
nested_vmx_exit_ctls_low, nested_vmx_exit_ctls_high);
nested_vmx_exit_ctls_low = VM_EXIT_ALWAYSON_WITHOUT_TRUE_MSR;
@@ -2299,7 +2291,6 @@
/* entry controls */
rdmsr(MSR_IA32_VMX_ENTRY_CTLS,
nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high);
- /* If bit 55 of VMX_BASIC is off, bits 0-8 and 12 must be 1. */
nested_vmx_entry_ctls_low = VM_ENTRY_ALWAYSON_WITHOUT_TRUE_MSR;
nested_vmx_entry_ctls_high &=
#ifdef CONFIG_X86_64
@@ -2394,7 +2385,7 @@
* guest, and the VMCS structure we give it - not about the
* VMX support of the underlying hardware.
*/
- *pdata = VMCS12_REVISION |
+ *pdata = VMCS12_REVISION | VMX_BASIC_TRUE_CTLS |
((u64)VMCS12_SIZE << VMX_BASIC_VMCS_SIZE_SHIFT) |
(VMX_BASIC_MEM_TYPE_WB << VMX_BASIC_MEM_TYPE_SHIFT);
break;