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hv:refine vm & vcpu lock

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-- move vm_state_lock to other place in vm structure
   to avoid the memory waste because of the page-aligned.
-- remove the memset from create_vm
-- explicitly set max_emul_mmio_regions and vcpuid_entry_nr to 0
   inside create_vm to avoid use without initialization.
-- rename max_emul_mmio_regions to nr_emul_mmio_regions
v1->v2:
   add deinit_emul_io in shutdown_vm

Tracked-On: #4958
Signed-off-by: Mingqiang Chi <mingqiang.chi@intel.com>
Reviewed-by: Grandhi, Sainath <sainath.grandhi@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Mingqiang Chi 2020-07-31 10:16:27 +08:00 committed by wenlingz
parent 19f8cc9af3
commit a67a85c70d
4 changed files with 20 additions and 12 deletions
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6
hypervisor/arch/x86/guest/vm.c
View File

@ -407,8 +407,6 @@ int32_t create_vm(uint16_t vm_id, uint64_t pcpu_bitmap, struct acrn_vm_config *v
/* Allocate memory for virtual machine */
vm = &vm_array[vm_id];
/* the vm_state lock field need to remain unchanged in vm data structure */
(void)memset((void *)&vm->arch_vm, 0U, (sizeof(struct acrn_vm) - sizeof(spinlock_t)));
vm->vm_id = vm_id;
vm->hw.created_vcpus = 0U;
@ -457,6 +455,8 @@ int32_t create_vm(uint16_t vm_id, uint64_t pcpu_bitmap, struct acrn_vm_config *v
vm->arch_vm.vlapic_mode = VM_VLAPIC_XAPIC;
vm->intr_inject_delay_delta = 0UL;
vm->nr_emul_mmio_regions = 0U;
vm->vcpuid_entry_nr = 0U;
/* Set up IO bit-mask such that VM exit occurs on
* selected IO ranges
@ -611,6 +611,8 @@ int32_t shutdown_vm(struct acrn_vm *vm)
deinit_vpci(vm);
deinit_emul_io(vm);
/* Free EPT allocated resources assigned to VM */
destroy_ept(vm);

12
hypervisor/dm/io_req.c
View File

@ -475,7 +475,7 @@ hv_emulate_mmio(struct acrn_vcpu *vcpu, struct io_request *io_req)
size = mmio_req->size;
spinlock_obtain(&vcpu->vm->emul_mmio_lock);
for (idx = 0U; idx <= vcpu->vm->max_emul_mmio_regions; idx++) {
for (idx = 0U; idx <= vcpu->vm->nr_emul_mmio_regions; idx++) {
mmio_handler = &(vcpu->vm->emul_mmio[idx]);
if (mmio_handler->read_write != NULL) {
base = mmio_handler->range_start;
@ -657,8 +657,8 @@ static inline struct mem_io_node *find_free_mmio_node(struct acrn_vm *vm)
if (mmio_node != NULL) {
idx = (uint16_t)(uint64_t)(mmio_node - &(vm->emul_mmio[0U]));
if (vm->max_emul_mmio_regions < idx) {
vm->max_emul_mmio_regions = idx;
if (vm->nr_emul_mmio_regions < idx) {
vm->nr_emul_mmio_regions = idx;
}
}
@ -724,3 +724,9 @@ void unregister_mmio_emulation_handler(struct acrn_vm *vm,
}
spinlock_release(&vm->emul_mmio_lock);
}
void deinit_emul_io(struct acrn_vm *vm)
{
(void)memset(vm->emul_mmio, 0U, sizeof(vm->emul_mmio));
(void)memset(vm->emul_pio, 0U, sizeof(vm->emul_pio));
}

12
hypervisor/include/arch/x86/guest/vm.h
View File

@ -81,7 +81,7 @@ struct vm_pm_info {
/* Enumerated type for VM states */
enum vm_state {
VM_POWERED_OFF = 0,
VM_POWERED_OFF = 0, /* MUST set 0 because vm_state's initialization depends on clear BSS section */
VM_CREATED, /* VM created / awaiting start (boot) */
VM_RUNNING, /* VM running */
VM_READY_TO_POWEROFF, /* RTVM only, it is trying to poweroff by itself */
@ -119,10 +119,6 @@ struct vm_arch {
} __aligned(PAGE_SIZE);
struct acrn_vm {
/* vm_state_lock MUST be the first field in VM structure it will not clear zero when creating VM
* this lock initialization depends on the clear BSS section
*/
spinlock_t vm_state_lock;/* Spin-lock used to protect vm/vcpu state transition for a VM */
struct vm_arch arch_vm; /* Reference to this VM's arch information */
struct vm_hw_info hw; /* Reference to this VM's HW information */
struct vm_sw_info sw; /* Reference to SW associated with this VM */
@ -134,10 +130,14 @@ struct acrn_vm {
struct acrn_vuart vuart[MAX_VUART_NUM_PER_VM]; /* Virtual UART */
enum vpic_wire_mode wire_mode;
struct iommu_domain *iommu; /* iommu domain of this VM */
/* vm_state_lock used to protect vm/vcpu state transition,
* the initialization depends on the clear BSS section
*/
spinlock_t vm_state_lock;
spinlock_t vlapic_mode_lock; /* Spin-lock used to protect vlapic_mode modifications for a VM */
spinlock_t ept_lock; /* Spin-lock used to protect ept add/modify/remove for a VM */
spinlock_t emul_mmio_lock; /* Used to protect emulation mmio_node concurrent access for a VM */
uint16_t max_emul_mmio_regions; /* max index of the emulated mmio_region */
uint16_t nr_emul_mmio_regions; /* the emulated mmio_region number */
struct mem_io_node emul_mmio[CONFIG_MAX_EMULATED_MMIO_REGIONS];
struct vm_io_handler_desc emul_pio[EMUL_PIO_IDX_MAX];

2
hypervisor/include/dm/io_req.h
View File

@ -286,7 +286,7 @@ void register_mmio_emulation_handler(struct acrn_vm *vm,
*/
void unregister_mmio_emulation_handler(struct acrn_vm *vm,
uint64_t start, uint64_t end);
void deinit_emul_io(struct acrn_vm *vm);
/**
* @}
*/