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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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39
hypervisor/include/arch/x86/irq.h
View File

@@ -25,7 +25,24 @@
#define NR_IRQS 256U
#define IRQ_INVALID 0xffffffffU
#define NR_STATIC_MAPPINGS (4U)
/* # of NR_STATIC_MAPPINGS_1 entries for timer, vcpu notify, and PMI */
#define NR_STATIC_MAPPINGS_1 3U
/*
* The static IRQ/Vector mapping table in irq.c consists of the following entries:
* # of NR_STATIC_MAPPINGS_1 entries for timer, vcpu notify, and PMI
*
* # of CONFIG_MAX_VM_NUM entries for posted interrupt notification, platform
* specific but known at build time:
* 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. The max numbers of vCPUs may be running on top of a pCPU is CONFIG_MAX_VM_NUM,
* since ACRN does not support 2 vCPUs of same VM running on top of same pCPU.
* 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.
*/
#define NR_STATIC_MAPPINGS (NR_STATIC_MAPPINGS_1 + CONFIG_MAX_VM_NUM)
#define HYPERVISOR_CALLBACK_VHM_VECTOR 0xF3U
@@ -39,13 +56,23 @@
#define TIMER_VECTOR (VECTOR_FIXED_START)
#define NOTIFY_VCPU_VECTOR (VECTOR_FIXED_START + 1U)
#define POSTED_INTR_VECTOR (VECTOR_FIXED_START + 2U)
#define PMI_VECTOR (VECTOR_FIXED_START + 3U)
#define PMI_VECTOR (VECTOR_FIXED_START + 2U)
/*
* Starting vector for posted interrupts
* # of CONFIG_MAX_VM_NUM (POSTED_INTR_VECTOR ~ (POSTED_INTR_VECTOR + CONFIG_MAX_VM_NUM - 1U))
* consecutive vectors reserved for posted interrupts
*/
#define POSTED_INTR_VECTOR (VECTOR_FIXED_START + NR_STATIC_MAPPINGS_1)
#define TIMER_IRQ (NR_IRQS - 1U)
#define NOTIFY_VCPU_IRQ (NR_IRQS - 2U)
#define POSTED_INTR_IRQ (NR_IRQS - 3U)
#define PMI_IRQ (NR_IRQS - 4U)
#define PMI_IRQ (NR_IRQS - 3U)
/*
* Starting IRQ for posted interrupts
* # of CONFIG_MAX_VM_NUM (POSTED_INTR_IRQ ~ (POSTED_INTR_IRQ + CONFIG_MAX_VM_NUM - 1U))
* consecutive IRQs reserved for posted interrupts
*/
#define POSTED_INTR_IRQ (NR_IRQS - NR_STATIC_MAPPINGS_1 - CONFIG_MAX_VM_NUM)
/* the maximum number of msi entry is 2048 according to PCI
* local bus specification
@@ -95,7 +122,7 @@ void init_default_irqs(uint16_t cpu_id);
void dispatch_exception(struct intr_excp_ctx *ctx);
void setup_notification(void);
void setup_posted_intr_notification(void);
void setup_pi_notification(void);
typedef void (*spurious_handler_t)(uint32_t vector);
extern spurious_handler_t spurious_handler;