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linux-sg2042
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hv: fail the probing immediately when we are not in hyperv platform 

We wait for about 5 seconds for the success of the hyperv registration even if
we were not in hyperv platform. This is suboptimal, so the patch check the cpuid
in the beginning of hv_acpi_init() instead of in vmbus_bus_init() to fail the
probing immediately.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Acked-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jason Wang 2012-08-17 18:52:43 +08:00 committed by Greg Kroah-Hartman
parent 4a52c4af48
commit 0592969e73
2 changed files with 25 additions and 25 deletions
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25
drivers/hv/hv.c
View File

@ -38,28 +38,6 @@ struct hv_context hv_context = {
.signal_event_buffer = NULL, .signal_event_buffer = NULL,
}; };
/*
* query_hypervisor_presence
* - Query the cpuid for presence of windows hypervisor
*/
static int query_hypervisor_presence(void)
{
unsigned int eax;
unsigned int ebx;
unsigned int ecx;
unsigned int edx;
unsigned int op;
eax = 0;
ebx = 0;
ecx = 0;
edx = 0;
op = HVCPUID_VERSION_FEATURES;
cpuid(op, &eax, &ebx, &ecx, &edx);
return ecx & HV_PRESENT_BIT;
}
/* /*
* query_hypervisor_info - Get version info of the windows hypervisor * query_hypervisor_info - Get version info of the windows hypervisor
*/ */
@ -160,9 +138,6 @@ int hv_init(void)
memset(hv_context.synic_message_page, 0, memset(hv_context.synic_message_page, 0,
sizeof(void *) * NR_CPUS); sizeof(void *) * NR_CPUS);
if (!query_hypervisor_presence())
goto cleanup;
max_leaf = query_hypervisor_info(); max_leaf = query_hypervisor_info();
/* /*

25
drivers/hv/vmbus_drv.c
View File

@ -719,10 +719,35 @@ static struct acpi_driver vmbus_acpi_driver = {
}, },
}; };
/*
* query_hypervisor_presence
* - Query the cpuid for presence of windows hypervisor
*/
static int query_hypervisor_presence(void)
{
unsigned int eax;
unsigned int ebx;
unsigned int ecx;
unsigned int edx;
unsigned int op;
eax = 0;
ebx = 0;
ecx = 0;
edx = 0;
op = HVCPUID_VERSION_FEATURES;
cpuid(op, &eax, &ebx, &ecx, &edx);
return ecx & HV_PRESENT_BIT;
}
static int __init hv_acpi_init(void) static int __init hv_acpi_init(void)
{ {
int ret, t; int ret, t;
if (!query_hypervisor_presence())
return -ENODEV;
init_completion(&probe_event); init_completion(&probe_event);
/* /*