[Xen-changelog] [xen master] x86/VT-x: Dump VMCS on VMLAUNCH/VMRESUME failure

[patchbot@xxxxxxx]

commit d0fd9ae54491328b10dee4003656c14b3bf3d3e9
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Thu Jun 30 21:00:01 2016 +0100
Commit:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Mon Jul 4 10:51:48 2016 +0100

    x86/VT-x: Dump VMCS on VMLAUNCH/VMRESUME failure
    
    If a VMLAUNCH/VMRESUME fails due to invalid control or host state, dump the
    VMCS before crashing the domain.
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/arch/x86/hvm/vmx/vmcs.c        | 5 +++++
 xen/include/asm-x86/hvm/vmx/vmcs.h | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
index 46b63b6..1bd875a 100644
--- a/xen/arch/x86/hvm/vmx/vmcs.c
+++ b/xen/arch/x86/hvm/vmx/vmcs.c
@@ -1637,6 +1637,11 @@ void vmx_vmentry_failure(void)
     __vmread(VM_INSTRUCTION_ERROR, &error);
     gprintk(XENLOG_ERR, "VM%s error: %#lx\n",
             curr->arch.hvm_vmx.launched ? "RESUME" : "LAUNCH", error);
+
+    if ( error == VMX_INSN_INVALID_CONTROL_STATE ||
+         error == VMX_INSN_INVALID_HOST_STATE )
+        vmcs_dump_vcpu(curr);
+
     domain_crash_synchronous();
 }
 
diff --git a/xen/include/asm-x86/hvm/vmx/vmcs.h 
b/xen/include/asm-x86/hvm/vmx/vmcs.h
index 9f1729d..1e33d9c 100644
--- a/xen/include/asm-x86/hvm/vmx/vmcs.h
+++ b/xen/include/asm-x86/hvm/vmx/vmcs.h
@@ -567,6 +567,10 @@ enum vmcs_field {
 #define VMX_GUEST_MSR 0
 #define VMX_HOST_MSR  1
 
+/* VM Instruction error numbers. */
+#define VMX_INSN_INVALID_CONTROL_STATE       7
+#define VMX_INSN_INVALID_HOST_STATE          8
+
 void vmx_disable_intercept_for_msr(struct vcpu *v, u32 msr, int type);
 void vmx_enable_intercept_for_msr(struct vcpu *v, u32 msr, int type);
 int vmx_read_guest_msr(u32 msr, u64 *val);
--
generated by git-patchbot for /home/xen/git/xen.git#master

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