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Drivers: hv: Base autoeoi enablement based on hypervisor hints 

Don't enable auto-eoi if the hypervisor recommends otherwise. This will
enable vAPIC functionality if available.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan 2017-03-14 18:01:39 -07:00 committed by Greg Kroah-Hartman
parent 4539673a6a
commit 6c248aad81
2 changed files with 9 additions and 1 deletions
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5
arch/x86/include/uapi/asm/hyperv.h
View File

@ -147,6 +147,11 @@
*/
#define HV_X64_RELAXED_TIMING_RECOMMENDED (1 << 5)
/*
* Virtual APIC support
*/
#define HV_X64_DEPRECATING_AEOI_RECOMMENDED (1 << 9)
/*
* Crash notification flag.
*/

5
drivers/hv/hv.c
View File

@ -254,7 +254,10 @@ int hv_synic_init(unsigned int cpu)
shared_sint.as_uint64 = 0;
shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR;
shared_sint.masked = false;
shared_sint.auto_eoi = true;
if (ms_hyperv.hints & HV_X64_DEPRECATING_AEOI_RECOMMENDED)
shared_sint.auto_eoi = false;
else
shared_sint.auto_eoi = true;
hv_set_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
shared_sint.as_uint64);