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Add a 'show vmcs' DDB command to dump state about the current CPU's

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current VMCS.
This commit is contained in:
John Baldwin 2011-06-02 13:49:19 +00:00
parent 87c3644c64
commit b3996dd47c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/projects/bhyve/; revision=222605
3 changed files with 99 additions and 1 deletions
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96
sys/amd64/vmm/intel/vmcs.c
View File

@ -26,6 +26,8 @@
* $FreeBSD$
*/
#include "opt_ddb.h"
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
@ -45,6 +47,10 @@ __FBSDID("$FreeBSD$");
#include "ept.h"
#include "vmx.h"
#ifdef DDB
#include <ddb/ddb.h>
#endif
static uint64_t
vmcs_fix_regval(uint32_t encoding, uint64_t val)
{
@ -449,3 +455,93 @@ vmcs_read(uint32_t encoding)
return (val);
}
#ifdef DDB
extern int vmxon_enabled[];
DB_SHOW_COMMAND(vmcs, db_show_vmcs)
{
uint64_t cur_vmcs, val;
uint32_t exit;
if (!vmxon_enabled[curcpu]) {
db_printf("VMX not enabled\n");
return;
}
if (have_addr) {
db_printf("Only current VMCS supported\n");
return;
}
vmptrst(&cur_vmcs);
if (cur_vmcs == VMCS_INITIAL) {
db_printf("No current VM context\n");
return;
}
db_printf("VMCS: %jx\n", cur_vmcs);
db_printf("VPID: %lu\n", vmcs_read(VMCS_VPID));
db_printf("Activity: ");
val = vmcs_read(VMCS_GUEST_ACTIVITY);
switch (val) {
case 0:
db_printf("Active");
break;
case 1:
db_printf("HLT");
break;
case 2:
db_printf("Shutdown");
break;
case 3:
db_printf("Wait for SIPI");
break;
default:
db_printf("Unknown: %#lx", val);
}
db_printf("\n");
exit = vmcs_read(VMCS_EXIT_REASON);
if (exit & 0x80000000)
db_printf("Entry Failure Reason: %u\n", exit & 0xffff);
else
db_printf("Exit Reason: %u\n", exit & 0xffff);
db_printf("Qualification: %#lx\n", vmcs_exit_qualification());
db_printf("Guest Linear Address: %#lx\n",
vmcs_read(VMCS_GUEST_LINEAR_ADDRESS));
switch (exit & 0x8000ffff) {
case EXIT_REASON_EXCEPTION:
case EXIT_REASON_EXT_INTR:
val = vmcs_read(VMCS_EXIT_INTERRUPTION_INFO);
db_printf("Interrupt Type: ");
switch (val >> 8 & 0x7) {
case 0:
db_printf("external");
break;
case 2:
db_printf("NMI");
break;
case 3:
db_printf("HW exception");
break;
case 4:
db_printf("SW exception");
break;
default:
db_printf("?? %lu", val >> 8 & 0x7);
break;
}
db_printf(" Vector: %lu", val & 0xff);
if (val & 0x800)
db_printf(" Error Code: %lx",
vmcs_read(VMCS_EXIT_INTERRUPTION_ERROR));
db_printf("\n");
break;
case EXIT_REASON_EPT_FAULT:
case EXIT_REASON_EPT_MISCONFIG:
db_printf("Guest Physical Address: %#lx\n",
vmcs_read(VMCS_GUEST_PHYSICAL_ADDRESS));
break;
}
db_printf("VM-instruction error: %#lx\n", vmcs_instruction_error());
}
#endif

2
sys/amd64/vmm/intel/vmcs.h
View File

@ -68,6 +68,8 @@ uint64_t vmcs_read(uint32_t encoding);
#endif /* _KERNEL */
#define VMCS_INITIAL 0xffffffffffffffff
#define VMCS_IDENT(encoding) ((encoding) | 0x80000000)
/*
* VMCS field encodings from Appendix H, Intel Architecture Manual Vol3B.

2
sys/amd64/vmm/intel/vmx.c
View File

@ -110,7 +110,7 @@ MALLOC_DEFINE(M_VMX, "vmx", "vmx");
extern struct pcpu __pcpu[];
static int vmxon_enabled[MAXCPU];
int vmxon_enabled[MAXCPU];
static char vmxon_region[MAXCPU][PAGE_SIZE] __aligned(PAGE_SIZE);
static uint32_t pinbased_ctls, procbased_ctls, procbased_ctls2;