[Xen-devel] [PATCH v4 03/11] nested vmx: expose bit 55 of IA32_VMX_BASIC_MSR to guest VMM

[Dongxiao Xu <dongxiao.xu@xxxxxxxxx>]

Besides, use literal name instead of hard numbers for this bit 55 in
IA32_VMX_BASIC_MSR.

Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vmcs.c        |    2 +-
 xen/arch/x86/hvm/vmx/vvmx.c        |    6 +++++-
 xen/include/asm-x86/hvm/vmx/vmcs.h |    6 ++++++
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
index 205e705..9adc7a4 100644
--- a/xen/arch/x86/hvm/vmx/vmcs.c
+++ b/xen/arch/x86/hvm/vmx/vmcs.c
@@ -237,7 +237,7 @@ static int vmx_init_vmcs_config(void)
          * We check VMX_BASIC_MSR[55] to correctly handle default controls.
          */
         uint32_t must_be_one, must_be_zero, msr = MSR_IA32_VMX_PROCBASED_CTLS;
-        if ( vmx_basic_msr_high & (1u << 23) )
+        if ( vmx_basic_msr_high & (VMX_BASIC_DEFAULT1_ZERO >> 32) )
             msr = MSR_IA32_VMX_TRUE_PROCBASED_CTLS;
         rdmsr(msr, must_be_one, must_be_zero);
         if ( must_be_one & (CPU_BASED_INVLPG_EXITING |
diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
index eb10bbf..ec5e8a7 100644
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -1311,9 +1311,10 @@ int nvmx_msr_read_intercept(unsigned int msr, u64 
*msr_content)
     switch (msr) {
     case MSR_IA32_VMX_BASIC:
         data = VVMCS_REVISION | ((u64)PAGE_SIZE) << 32 | 
-               ((u64)MTRR_TYPE_WRBACK) << 50;
+               ((u64)MTRR_TYPE_WRBACK) << 50 | VMX_BASIC_DEFAULT1_ZERO;
         break;
     case MSR_IA32_VMX_PINBASED_CTLS:
+    case MSR_IA32_VMX_TRUE_PINBASED_CTLS:
         /* 1-seetings */
         data = PIN_BASED_EXT_INTR_MASK |
                PIN_BASED_NMI_EXITING |
@@ -1322,6 +1323,7 @@ int nvmx_msr_read_intercept(unsigned int msr, u64 
*msr_content)
         data = ((data | tmp) << 32) | (tmp);
         break;
     case MSR_IA32_VMX_PROCBASED_CTLS:
+    case MSR_IA32_VMX_TRUE_PROCBASED_CTLS:
         /* 1-seetings */
         data = CPU_BASED_HLT_EXITING |
                CPU_BASED_VIRTUAL_INTR_PENDING |
@@ -1353,6 +1355,7 @@ int nvmx_msr_read_intercept(unsigned int msr, u64 
*msr_content)
         data = (data << 32) | tmp;
         break;
     case MSR_IA32_VMX_EXIT_CTLS:
+    case MSR_IA32_VMX_TRUE_EXIT_CTLS:
         /* 1-seetings */
         tmp = VMX_EXIT_CTLS_DEFAULT1;
         data = VM_EXIT_ACK_INTR_ON_EXIT |
@@ -1367,6 +1370,7 @@ int nvmx_msr_read_intercept(unsigned int msr, u64 
*msr_content)
         data = ((data | tmp) << 32) | tmp;
         break;
     case MSR_IA32_VMX_ENTRY_CTLS:
+    case MSR_IA32_VMX_TRUE_ENTRY_CTLS:
         /* 1-seetings */
         tmp = VMX_ENTRY_CTLS_DEFAULT1;
         data = VM_ENTRY_LOAD_GUEST_PAT |
diff --git a/xen/include/asm-x86/hvm/vmx/vmcs.h 
b/xen/include/asm-x86/hvm/vmx/vmcs.h
index 14ac773..ef2c9c9 100644
--- a/xen/include/asm-x86/hvm/vmx/vmcs.h
+++ b/xen/include/asm-x86/hvm/vmx/vmcs.h
@@ -247,6 +247,12 @@ extern bool_t cpu_has_vmx_ins_outs_instr_info;
 #define VMX_INTR_SHADOW_SMI             0x00000004
 #define VMX_INTR_SHADOW_NMI             0x00000008
 
+/* 
+ * bit 55 of IA32_VMX_BASIC MSR, indicating whether any VMX controls that
+ * default to 1 may be cleared to 0.
+ */
+#define VMX_BASIC_DEFAULT1_ZERO                (1ULL << 55)
+
 /* VMCS field encodings. */
 enum vmcs_field {
     VIRTUAL_PROCESSOR_ID            = 0x00000000,
-- 
1.7.1


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