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mshyperv: fix recognition of Hyper-V guest crash MSR's

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Hypervisor Top Level Functional Specification v3.1/4.0 notes that cpuid
(0x40000003) EDX's 10th bit should be used to check that Hyper-V guest
crash MSR's functionality available.

This patch should fix this recognition. Currently the code checks EAX
register instead of EDX.

Signed-off-by: Andrey Smetanin <asmetanin@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Denis V. Lunev 2015-08-01 16:08:20 -07:00 committed by Greg Kroah-Hartman
parent 4a54243fc0
commit cc2dd4027a
3 changed files with 4 additions and 2 deletions
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1
arch/x86/include/asm/mshyperv.h
View File

@ -7,6 +7,7 @@
struct ms_hyperv_info {
u32 features;
u32 misc_features;
u32 hints;
};

1
arch/x86/kernel/cpu/mshyperv.c
View File

@ -158,6 +158,7 @@ static void __init ms_hyperv_init_platform(void)
* Extract the features and hints
*/
ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES);
ms_hyperv.misc_features = cpuid_edx(HYPERV_CPUID_FEATURES);
ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO);
printk(KERN_INFO "HyperV: features 0x%x, hints 0x%x\n",

4
drivers/hv/vmbus_drv.c
View File

@ -871,7 +871,7 @@ static int vmbus_bus_init(int irq)
/*
* Only register if the crash MSRs are available
*/
if (ms_hyperv.features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
register_die_notifier(&hyperv_die_block);
atomic_notifier_chain_register(&panic_notifier_list,
&hyperv_panic_block);
@ -1169,7 +1169,7 @@ static void __exit vmbus_exit(void)
hv_remove_vmbus_irq();
tasklet_kill(&msg_dpc);
vmbus_free_channels();
if (ms_hyperv.features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
if (ms_hyperv.misc_features & HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE) {
unregister_die_notifier(&hyperv_die_block);
atomic_notifier_chain_unregister(&panic_notifier_list,
&hyperv_panic_block);