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Code Issues Releases Activity

Add post-mortem debugging for "EPT Misconfiguration" VM-exit. This error

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is hard to reproduce so try to collect all the breadcrumbs when it happens.

Reviewed by:	grehan
This commit is contained in:
Neel Natu 2014-06-27 18:00:38 +00:00
parent 59644098f8
commit 64fe72354c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=267966
1 changed files with 25 additions and 1 deletions
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26
usr.sbin/bhyve/bhyverun.c
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@ -399,6 +399,16 @@ vmexit_spinup_ap(struct vmctx *ctx, struct vm_exit *vme, int *pvcpu)
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_exit *vmexit, int *pvcpu)
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);
}