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HV: Use NMI-window exiting to address req missing issue

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There is a window where we may miss the current request in the
notification period when the work flow is as the following:

      CPUx +                   + CPUr
           |                   |
           |                   +--+
           |                   |  | Handle pending req
           |                   <--+
           +--+                |
           |  | Set req flag   |
           <--+                |
           +------------------>---+
           |     Send NMI      |  | Handle NMI
           |                   <--+
           |                   |
           |                   |
           |                   +--> vCPU enter
           |                   |
           +                   +

So, this patch enables the NMI-window exiting to trigger the next vmexit
once there is no "virtual-NMI blocking" after vCPU enter into VMX non-root
mode. Then we can process the pending request on time.

Tracked-On: #3886
Acked-by: Eddie Dong <eddie.dong@intel.com>
Signed-off-by: Kaige Fu <kaige.fu@intel.com>
This commit is contained in:
Kaige Fu
2019-12-06 09:34:07 +00:00
committed by wenlingz
parent d26d8bec01
commit 29b7aff59f
5 changed files with 49 additions and 4 deletions
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1
hypervisor/include/arch/x86/irq.h
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@@ -209,6 +209,7 @@ void vcpu_make_request(struct acrn_vcpu *vcpu, uint16_t eventid);
* @pre vcpu != NULL
*/
int32_t exception_vmexit_handler(struct acrn_vcpu *vcpu);
int32_t nmi_window_vmexit_handler(struct acrn_vcpu *vcpu);
int32_t interrupt_window_vmexit_handler(struct acrn_vcpu *vcpu);
int32_t external_interrupt_vmexit_handler(struct acrn_vcpu *vcpu);
int32_t acrn_handle_pending_request(struct acrn_vcpu *vcpu);