[Xen-devel] [PATCH v2] x86/hvm: Print register state upon triple fault

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

A sample looks like:

(XEN) d1v0 Triple fault - invoking HVM shutdown action 1
(XEN) *** Dumping Dom1 vcpu#0 state: ***
(XEN) ----[ Xen-4.7-unstable  x86_64  debug=y  Not tainted ]----
(XEN) CPU:    2
(XEN) RIP:    0000:[<0000000000100005>]
(XEN) RFLAGS: 0000000000010002   CONTEXT: hvm guest (d1v0)
(XEN) rax: 0000000000000020   rbx: 0000000000000000   rcx: 0000000000000000
(XEN) rdx: 0000000000000000   rsi: 0000000000000000   rdi: 0000000000000000
(XEN) rbp: 0000000000000000   rsp: 0000000000000000   r8:  0000000000000000
(XEN) r9:  0000000000000000   r10: 0000000000000000   r11: 0000000000000000
(XEN) r12: 0000000000000000   r13: 0000000000000000   r14: 0000000000000000
(XEN) r15: 0000000000000000   cr0: 0000000000000011   cr4: 0000000000000000
(XEN) cr3: 0000000000000000   cr2: 0000000000000000
(XEN) ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: 0000   cs: 0000

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Jan Beulich <JBeulich@xxxxxxxx>

v2:
 * Dump all execution state rather than just %cs:%eip.  At most, it will
   happen once per domain.
---
 xen/arch/x86/hvm/hvm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index fb2d81b..5641feb 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -2891,6 +2891,7 @@ void hvm_triple_fault(void)
     gprintk(XENLOG_INFO,
             "Triple fault - invoking HVM shutdown action %d\n",
             reason);
+    vcpu_show_execution_state(v);
     domain_shutdown(d, reason);
 }
 
-- 
2.1.4


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