From 6c248aad81c8903981db9f12fd74189fa01b3789 Mon Sep 17 00:00:00 2001 From: "K. Y. Srinivasan" Date: Tue, 14 Mar 2017 18:01:39 -0700 Subject: [PATCH] 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 Signed-off-by: Greg Kroah-Hartman --- arch/x86/include/uapi/asm/hyperv.h | 5 +++++ drivers/hv/hv.c | 5 ++++- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/uapi/asm/hyperv.h b/arch/x86/include/uapi/asm/hyperv.h index 32ea7a3ad5b4..432df4b1baec 100644 --- a/arch/x86/include/uapi/asm/hyperv.h +++ b/arch/x86/include/uapi/asm/hyperv.h @@ -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. */ diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index 665a64f1611e..12e7baecb84e 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -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); -- 2.20.1