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Changes to allow the GENERIC+bhye kernel built from this branch to

Browse Source 
run as a 1/2 CPU guest on an 8.1 bhyve host.

bhyve/inout.c
      inout.h
      fbsdrun.c
 - Rather than exiting on accesses to unhandled i/o ports, emulate
   hardware by returning -1 on reads and ignoring writes to unhandled
   ports. Support the previous mode by allowing a 'strict' parameter
   to be set from the command line.
   The 8.1 guest kernel was vastly cut down from GENERIC and had no
   ISA devices. Booting GENERIC exposes a massive amount of random
   touching of i/o ports (hello syscons/vga/atkbdc).

bhyve/consport.c
dev/bvm/bvm_console.c
 - implement a simplistic signature for the bvm console by returning
   'bv' for an inw on the port. Also, set the priority of the console
   to CN_REMOTE if the signature was returned. This works better in
   an environment where multiple consoles are in the kernel (hello syscons)

bhyve/rtc.c
 - return 0 for the access to RTC_EQUIPMENT (yes, you syscons)

amd64/vmm/x86.c
          x86.h
 - hide a bunch more CPUID leaf 1 bits from the guest to prevent
   cpufreq drivers from probing.
   The next step will be to move CPUID handling completely into
   user-space. This will allow the full spectrum of changes from
   presenting a lowest-common-denominator CPU type/feature set, to
   exposing (almost) everything that the host can support.

Reviewed by:	neel
Obtained from:	NetApp
This commit is contained in:
Peter Grehan 2011-05-19 21:53:25 +00:00
parent 17debe0d59
commit 1f3025e133
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/projects/bhyve/; revision=222105
8 changed files with 92 additions and 15 deletions
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21
sys/amd64/vmm/x86.c
View File

@ -75,12 +75,18 @@ x86_emulate_cpuid(uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx)
regs[1] |= (0 << CPUID_0000_0001_APICID_SHIFT);
/*
* Don't expose VMX capability.
* Don't expose VMX, SpeedStep or TME capability.
* Advertise x2APIC capability.
*/
regs[2] &= ~CPUID_0000_0001_FEAT0_VMX;
regs[2] &= ~(CPUID_0000_0001_FEAT0_VMX | CPUID2_EST |
CPUID2_TM2);
regs[2] |= CPUID2_X2APIC;
/*
* Hide thermal monitoring
*/
regs[3] &= ~(CPUID_ACPI | CPUID_TM);
/*
* Machine check handling is done in the host.
* Hide MTRR capability.
@ -89,6 +95,17 @@ x86_emulate_cpuid(uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx)
break;
case CPUID_0000_0006:
/*
* Handle the access, but report 0 for
* all options
*/
regs[0] = 0;
regs[1] = 0;
regs[2] = 0;
regs[3] = 0;
break;
case CPUID_0000_000B:
/*
* XXXSMP fixme

1
sys/amd64/vmm/x86.h
View File

@ -34,6 +34,7 @@
#define CPUID_0000_0002 (0x2)
#define CPUID_0000_0003 (0x3)
#define CPUID_0000_0004 (0x4)
#define CPUID_0000_0006 (0x6)
#define CPUID_0000_000A (0xA)
#define CPUID_0000_000B (0xB)
#define CPUID_8000_0000 (0x80000000)

18
sys/dev/bvm/bvm_console.c
View File

@ -70,6 +70,8 @@ static int alt_break_state;
#define BVM_CONS_PORT 0x220
static int bvm_cons_port = BVM_CONS_PORT;
#define BVM_CONS_SIG ('b' << 8 | 'v')
static void bvm_timeout(void *);
static cn_probe_t bvm_cnprobe;
@ -171,14 +173,16 @@ bvm_cnprobe(struct consdev *cp)
int disabled, port;
disabled = 0;
resource_int_value("bvmconsole", 0, "disabled", &disabled);
if (disabled)
cp->cn_pri = CN_DEAD;
else
cp->cn_pri = CN_NORMAL;
cp->cn_pri = CN_DEAD;
if (resource_int_value("bvmconsole", 0, "port", &port) == 0)
bvm_cons_port = port;
resource_int_value("bvmconsole", 0, "disabled", &disabled);
if (!disabled) {
if (resource_int_value("bvmconsole", 0, "port", &port) == 0)
bvm_cons_port = port;
if (inw(bvm_cons_port) == BVM_CONS_SIG)
cp->cn_pri = CN_REMOTE;
}
}
static void

6
usr.sbin/bhyve/consport.c
View File

@ -41,6 +41,7 @@ __FBSDID("$FreeBSD$");
#include "inout.h"
#define BVM_CONSOLE_PORT 0x220
#define BVM_CONS_SIG ('b' << 8 | 'v')
static struct termios tio_orig, tio_new;
@ -103,6 +104,11 @@ console_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
{
static int opened;
if (bytes == 2 && in) {
*eax = BVM_CONS_SIG;
return (0);
}
if (bytes != 4)
return (-1);

12
usr.sbin/bhyve/fbsdrun.c
View File

@ -85,6 +85,8 @@ static int guest_vmexit_on_hlt, guest_vmexit_on_pause;
static int foundcpus;
static int strictio;
static char *lomem_addr;
static char *himem_addr;
@ -122,7 +124,7 @@ usage(int code)
{
fprintf(stderr,
"Usage: %s [-hBHP][-g <gdb port>][-z <hz>][-s <pci>][-p pincpu]"
"Usage: %s [-ehBHP][-g <gdb port>][-z <hz>][-s <pci>][-p pincpu]"
"[-n <pci>][-m lowmem][-M highmem] <vm>\n"
" -g: gdb port (default is %d and 0 means don't open)\n"
" -c: # cpus (default 1)\n"
@ -130,6 +132,7 @@ usage(int code)
" -B: inject breakpoint exception on vm entry\n"
" -H: vmexit from the guest on hlt\n"
" -P: vmexit from the guest on pause\n"
" -e: exit on unhandled i/o access\n"
" -h: help\n"
" -z: guest hz (default is %d)\n"
" -s: <slot,driver,configinfo> PCI slot config\n"
@ -300,7 +303,7 @@ vmexit_inout(struct vmctx *ctx, struct vm_exit *vme, int *pvcpu)
if (out && port == GUEST_NIO_PORT)
return (vmexit_handle_notify(ctx, vme, pvcpu, eax));
error = emulate_inout(ctx, vcpu, in, port, bytes, &eax);
error = emulate_inout(ctx, vcpu, in, port, bytes, &eax, strictio);
if (error == 0 && in)
error = vm_set_register(ctx, vcpu, VM_REG_GUEST_RAX, eax);
@ -510,7 +513,7 @@ main(int argc, char *argv[])
gdb_port = DEFAULT_GDB_PORT;
guest_ncpus = 1;
while ((c = getopt(argc, argv, "hBHPxp:g:c:z:s:n:m:M:")) != -1) {
while ((c = getopt(argc, argv, "ehBHPxp:g:c:z:s:n:m:M:")) != -1) {
switch (c) {
case 'B':
inject_bkpt = 1;
@ -551,6 +554,9 @@ main(int argc, char *argv[])
case 'P':
guest_vmexit_on_pause = 1;
break;
case 'e':
strictio = 1;
break;
case 'h':
usage(0);
default:

41
usr.sbin/bhyve/inout.c
View File

@ -48,9 +48,30 @@ static struct {
void *arg;
} inout_handlers[MAX_IOPORTS];
static int
default_inout(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
uint32_t *eax, void *arg)
{
if (in) {
switch (bytes) {
case 4:
*eax = 0xffffffff;
break;
case 2:
*eax = 0xffff;
break;
case 1:
*eax = 0xff;
break;
}
}
return (0);
}
int
emulate_inout(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
uint32_t *eax)
uint32_t *eax, int strict)
{
int flags;
inout_func_t handler;
@ -58,7 +79,9 @@ emulate_inout(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
assert(port < MAX_IOPORTS);
if ((handler = inout_handlers[port].handler) == NULL)
handler = inout_handlers[port].handler;
if (strict && handler == default_inout)
return (-1);
flags = inout_handlers[port].flags;
@ -74,7 +97,21 @@ void
init_inout(void)
{
struct inout_port **iopp, *iop;
int i;
/*
* Set up the default handler for all ports
*/
for (i = 0; i < MAX_IOPORTS; i++) {
inout_handlers[i].name = "default";
inout_handlers[i].flags = IOPORT_F_IN | IOPORT_F_OUT;
inout_handlers[i].handler = default_inout;
inout_handlers[i].arg = NULL;
}
/*
* Overwrite with specified handlers
*/
SET_FOREACH(iopp, inout_port_set) {
iop = *iopp;
assert(iop->port < MAX_IOPORTS);

2
usr.sbin/bhyve/inout.h
View File

@ -59,7 +59,7 @@ struct inout_port {
void init_inout(void);
int emulate_inout(struct vmctx *, int vcpu, int in, int port, int bytes,
uint32_t *eax);
uint32_t *eax, int strict);
int register_inout(struct inout_port *iop);
#endif /* _INOUT_H_ */

6
usr.sbin/bhyve/rtc.c
View File

@ -68,6 +68,8 @@ __FBSDID("$FreeBSD$");
#define RTC_RSTCODE 0x0f
#define RTC_EQUIPMENT 0x14
static int addr;
/* XXX initialize these to default values as they would be from BIOS */
@ -136,6 +138,7 @@ rtc_addr_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
case RTC_STATUSD:
case RTC_DIAG:
case RTC_RSTCODE:
case RTC_EQUIPMENT:
break;
default:
return (-1);
@ -228,6 +231,9 @@ rtc_data_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
case RTC_RSTCODE:
*eax = rstcode;
return (0);
case RTC_EQUIPMENT:
*eax = 0;
return (0);
default:
return (-1);
}