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hv: define posted interrupt IRQs/vectors

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This is a preparation patch for adding support for VT-d PI
related vCPU scheduling.

ACRN does not support vCPU migration, one vCPU always runs on
the same pCPU, so PI's ndst is never changed after startup.

VCPUs of a VM won’t share same pCPU. So the maximum possible number
of VCPUs that can run on a pCPU is CONFIG_MAX_VM_NUM.

Allocate unique Activation Notification Vectors (ANV) for each vCPU
that belongs to the same pCPU, the ANVs need only be unique within each
pCPU, not across all vCPUs. This reduces # of pre-allocated ANVs for
posted interrupts to CONFIG_MAX_VM_NUM, and enables ACRN to avoid
switching between active and wake-up vector values in the posted
interrupt descriptor on vCPU scheduling state changes.

A total of CONFIG_MAX_VM_NUM consecutive IRQs/vectors are reserved
for posted interrupts use.

The code first initializes vcpu->arch.pid.control.bits.nv dynamically
(will be added in subsequent patch), the other code shall use
vcpu->arch.pid.control.bits.nv instead of the hard-coded notification vectors.

Rename some functions:
  apicv_post_intr --> apicv_trigger_pi_anv
  posted_intr_notification --> handle_pi_notification
  setup_posted_intr_notification --> setup_pi_notification

Tracked-On: #4506
Signed-off-by: dongshen <dongsheng.x.zhang@intel.com>
Reviewed-by: Eddie Dong <eddie.dong@Intel.com>
This commit is contained in:
dongshen
2020-03-19 09:12:22 -07:00
committed by wenlingz
parent c2d350c5cc
commit 14fa9c563c
7 changed files with 68 additions and 26 deletions
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19
hypervisor/arch/x86/notify.c
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@@ -98,21 +98,20 @@ void setup_notification(void)
notification_irq, irq_to_vector(notification_irq));
}
static void posted_intr_notification(__unused uint32_t irq, __unused void *data)
static void handle_pi_notification(__unused uint32_t irq, __unused void *data)
{
/* Dummy IRQ handler for case that Posted-Interrupt Notification
* is sent to vCPU in root mode(isn't running),interrupt will be
* picked up in next vmentry,do nothine here.
*/
}
/*pre-conditon: be called only by BSP initialization proccess*/
void setup_posted_intr_notification(void)
void setup_pi_notification(void)
{
if (request_irq(POSTED_INTR_IRQ,
posted_intr_notification,
NULL, IRQF_NONE) < 0) {
pr_err("Failed to setup posted-intr notification");
uint32_t i;
for (i = 0U; i < CONFIG_MAX_VM_NUM; i++) {
if (request_irq(POSTED_INTR_IRQ + i, handle_pi_notification, NULL, IRQF_NONE) < 0) {
pr_err("Failed to setup pi notification");
break;
}
}
}