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hv: support asyncio request

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Current IO emulation is synchronous. The user VM need to wait for the
completion of the the I/O request before return. But Virtio Spec
introduces introduces asynchronous IO with a new register in MMIO/PIO
space named NOTIFY, to be used for FE driver to notify BE driver, ACRN
hypervisor can emulate this register by sending a notification to vCPU
in Service VM side. This way, FE side can resume to work without waiting
for the full completion of BE side response.

Tracked-On: #8209
Signed-off-by: Conghui <conghui.chen@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Conghui
2022-08-17 09:58:23 +08:00
committed by acrnsi-robot
parent 9cf9606e56
commit 12bfa98a37
8 changed files with 31 additions and 5 deletions
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5
hypervisor/common/sbuf.c
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@@ -77,7 +77,7 @@ uint32_t sbuf_put(struct shared_buf *sbuf, uint8_t *data)
return ele_size;
}
int32_t sbuf_setup_common(__unused struct acrn_vm *vm, uint16_t cpu_id, uint32_t sbuf_id, uint64_t *hva)
int32_t sbuf_setup_common(struct acrn_vm *vm, uint16_t cpu_id, uint32_t sbuf_id, uint64_t *hva)
{
int32_t ret = 0;
@@ -88,6 +88,9 @@ int32_t sbuf_setup_common(__unused struct acrn_vm *vm, uint16_t cpu_id, uint32_t
case ACRN_SOCWATCH:
ret = sbuf_share_setup(cpu_id, sbuf_id, hva);
break;
case ACRN_ASYNCIO:
ret = init_asyncio(vm, hva);
break;
default:
pr_err("%s not support sbuf_id %d", __func__, sbuf_id);
ret = -1;