[Xen-devel] [PATCH 2/3] vvmx: return VMfail to L1 if L1 vmxon is executed in VMX operation

[Haozhong Zhang <haozhong.zhang@xxxxxxxxx>]

According to Intel SDM, section "VMXON - Enter VMX Operation", a
VMfail should be returned to L1 hypervisor if L1 vmxon is executed in
VMX operation, rather than just print a warning message.

Signed-off-by: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vvmx.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/xen/arch/x86/hvm/vmx/vvmx.c b/xen/arch/x86/hvm/vmx/vvmx.c
index f5637eb..b60d7f0 100644
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -1397,9 +1397,12 @@ int nvmx_handle_vmxon(struct cpu_user_regs *regs)
         return rc;
 
     if ( nvmx_vcpu_in_vmx(v) )
-        gdprintk(XENLOG_WARNING, 
-                 "vmxon again: orig %"PRIpaddr" new %lx\n",
-                 nvmx->vmxon_region_pa, gpa);
+    {
+        vmreturn(regs,
+                 nvcpu->nv_vvmcxaddr != VMCX_EADDR ?
+                 VMFAIL_VALID : VMFAIL_INVALID);
+        return X86EMUL_OKAY;
+    }
 
     nvmx->vmxon_region_pa = gpa;
 
-- 
2.10.1


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