Author: neel
Date: Fri Jun 27 18:00:38 2014
New Revision: 267966
URL: http://svnweb.freebsd.org/changeset/base/267966
Log:
Add post-mortem debugging for "EPT Misconfiguration" VM-exit. This error
is hard to reproduce so try to collect all the breadcrumbs when it happens.
Reviewed by: grehan
Modified:
head/usr.sbin/bhyve/bhyverun.c
Modified: head/usr.sbin/bhyve/bhyverun.c
==============================================================================
--- head/usr.sbin/bhyve/bhyverun.c Fri Jun 27 17:50:33 2014
(r267965)
+++ head/usr.sbin/bhyve/bhyverun.c Fri Jun 27 18:00:38 2014
(r267966)
@@ -399,6 +399,16 @@ vmexit_spinup_ap(struct vmctx *ctx, stru
return (retval);
}
+#define DEBUG_EPT_MISCONFIG
+#ifdef DEBUG_EPT_MISCONFIG
+#define EXIT_REASON_EPT_MISCONFIG 49
+#define VMCS_GUEST_PHYSICAL_ADDRESS 0x00002400
+#define VMCS_IDENT(x) ((x) | 0x80000000)
+
+static uint64_t ept_misconfig_gpa, ept_misconfig_pte[4];
+static int ept_misconfig_ptenum;
+#endif
+
static int
vmexit_vmx(struct vmctx *ctx, struct vm_exit *vmexit, int *pvcpu)
{
@@ -413,7 +423,21 @@ vmexit_vmx(struct vmctx *ctx, struct vm_
vmexit->u.vmx.exit_qualification);
fprintf(stderr, "\tinst_type\t\t%d\n", vmexit->u.vmx.inst_type);
fprintf(stderr, "\tinst_error\t\t%d\n", vmexit->u.vmx.inst_error);
-
+#ifdef DEBUG_EPT_MISCONFIG
+ if (vmexit->u.vmx.exit_reason == EXIT_REASON_EPT_MISCONFIG) {
+ vm_get_register(ctx, *pvcpu,
+ VMCS_IDENT(VMCS_GUEST_PHYSICAL_ADDRESS),
+ &ept_misconfig_gpa);
+ vm_get_gpa_pmap(ctx, ept_misconfig_gpa, ept_misconfig_pte,
+ &ept_misconfig_ptenum);
+ fprintf(stderr, "\tEPT misconfiguration:\n");
+ fprintf(stderr, "\t\tGPA: %#lx\n", ept_misconfig_gpa);
+ fprintf(stderr, "\t\tPTE(%d): %#lx %#lx %#lx %#lx\n",
+ ept_misconfig_ptenum, ept_misconfig_pte[0],
+ ept_misconfig_pte[1], ept_misconfig_pte[2],
+ ept_misconfig_pte[3]);
+ }
+#endif /* DEBUG_EPT_MISCONFIG */
return (VMEXIT_ABORT);
}
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