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Reorder the hypervisor presence test to avoid claiming ATA disks

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on non hyperv systems.

Reviewed by:	neel, abgupta at microsoft dot com
Approved by:	re@ (hrs)
This commit is contained in:
Peter Grehan 2013-09-19 02:34:52 +00:00
parent 58cd5000f0
commit 4a67483f2e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=255686
1 changed files with 38 additions and 28 deletions
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66
sys/dev/hyperv/stordisengage/hv_ata_pci_disengage.c
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@ -92,8 +92,17 @@ static int hv_check_for_hyper_v(void);
static int
hv_ata_pci_probe(device_t dev)
{
int ata_disk_enable = 0;
if(bootverbose)
int ata_disk_enable;
ata_disk_enable = 0;
/*
* Don't probe if not running in a Hyper-V environment
*/
if (!hv_check_for_hyper_v())
return (ENXIO);
if (bootverbose)
device_printf(dev,
"hv_ata_pci_probe dev_class/subslcass = %d, %d\n",
pci_get_class(dev), pci_get_subclass(dev));
@ -116,18 +125,15 @@ hv_ata_pci_probe(device_t dev)
* ATA driver, the environment variable
* hw_ata.disk_enable must be explicitly set to 1.
*/
if (hv_check_for_hyper_v()) {
if (getenv_int("hw.ata.disk_enable", &ata_disk_enable)) {
if(bootverbose)
device_printf(dev,
"hw.ata.disk_enable flag is disabling Hyper-V"
" ATA driver support\n");
if (getenv_int("hw.ata.disk_enable", &ata_disk_enable)) {
if(bootverbose)
device_printf(dev,
"hw.ata.disk_enable flag is disabling Hyper-V"
" ATA driver support\n");
return (ENXIO);
}
}
if(bootverbose)
if (bootverbose)
device_printf(dev, "Hyper-V ATA storage driver enabled.\n");
return (BUS_PROBE_VENDOR);
@ -136,13 +142,15 @@ hv_ata_pci_probe(device_t dev)
static int
hv_ata_pci_attach(device_t dev)
{
return 0;
return (0);
}
static int
hv_ata_pci_detach(device_t dev)
{
return 0;
return (0);
}
/**
@ -153,42 +161,44 @@ static int
hv_check_for_hyper_v(void)
{
u_int regs[4];
int hyper_v_detected = 0;
int hyper_v_detected;
hyper_v_detected = 0;
do_cpuid(1, regs);
if (regs[2] & 0x80000000) {
/* if(a hypervisor is detected) */
/* make sure this really is Hyper-V */
/* we look at the CPUID info */
/*
* if(a hypervisor is detected)
* make sure this really is Hyper-V
*/
do_cpuid(HV_X64_MSR_GUEST_OS_ID, regs);
hyper_v_detected =
regs[0] >= HV_X64_CPUID_MIN &&
regs[0] <= HV_X64_CPUID_MAX &&
!memcmp("Microsoft Hv", &regs[1], 12);
}
return (hyper_v_detected);
}
static device_method_t hv_ata_pci_methods[] = {
/* device interface */
DEVMETHOD(device_probe, hv_ata_pci_probe),
DEVMETHOD(device_attach, hv_ata_pci_attach),
DEVMETHOD(device_detach, hv_ata_pci_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
/* device interface */
DEVMETHOD(device_probe, hv_ata_pci_probe),
DEVMETHOD(device_attach, hv_ata_pci_attach),
DEVMETHOD(device_detach, hv_ata_pci_detach),
DEVMETHOD(device_shutdown, bus_generic_shutdown),
DEVMETHOD_END
DEVMETHOD_END
};
devclass_t hv_ata_pci_devclass;
static driver_t hv_ata_pci_disengage_driver = {
"pciata-disable",
hv_ata_pci_methods,
sizeof(struct ata_pci_controller),
"pciata-disable",
hv_ata_pci_methods,
sizeof(struct ata_pci_controller),
};
DRIVER_MODULE(atapci_dis, pci, hv_ata_pci_disengage_driver,
hv_ata_pci_devclass, NULL, NULL);
MODULE_VERSION(atapci_dis, 1);
MODULE_DEPEND(atapci_dis, ata, 1, 1, 1);