[Xen-devel] [PATCH v2 1/3] nested vmx: emulate IA32_VMX_MISC MSR

[Dongxiao Xu <dongxiao.xu@xxxxxxxxx>]

Use the host value to emulate IA32_VMX_MISC MSR for L1 VMM.
For CR3-target value, we don't support this feature currently and
set the number to zero.

Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vvmx.c        |    3 ++-
 xen/include/asm-x86/hvm/vmx/vmcs.h |    2 ++
 2 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
index 7b27d2d..16fb3fd 100644
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -1462,7 +1462,8 @@ int nvmx_msr_read_intercept(unsigned int msr, u64 
*msr_content)
         data = 0x267ff & ~X86_CR4_SMXE;
         break;
     case MSR_IA32_VMX_MISC:
-        gdprintk(XENLOG_WARNING, "VMX MSR %x not fully supported yet.\n", msr);
+        /* Do not support CR3-target feature now */
+        data = host_data & ~VMX_MISC_CR3_TARGET;
         break;
     default:
         r = 0;
diff --git a/xen/include/asm-x86/hvm/vmx/vmcs.h 
b/xen/include/asm-x86/hvm/vmx/vmcs.h
index ef2c9c9..3adffcc 100644
--- a/xen/include/asm-x86/hvm/vmx/vmcs.h
+++ b/xen/include/asm-x86/hvm/vmx/vmcs.h
@@ -209,6 +209,8 @@ extern bool_t cpu_has_vmx_ins_outs_instr_info;
 #define VMX_VPID_INVVPID_ALL_CONTEXT                        0x40000000000ULL
 #define VMX_VPID_INVVPID_SINGLE_CONTEXT_RETAINING_GLOBAL    0x80000000000ULL
 
+#define VMX_MISC_CR3_TARGET             0x1ff0000
+
 #define cpu_has_wbinvd_exiting \
     (vmx_secondary_exec_control & SECONDARY_EXEC_WBINVD_EXITING)
 #define cpu_has_vmx_virtualize_apic_accesses \
-- 
1.7.1


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