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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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4
hypervisor/include/public/acrn_common.h
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@@ -746,7 +746,9 @@ enum {
ACRN_HVLOG,
ACRN_SEP,
ACRN_SOCWATCH,
ACRN_SBUF_ID_MAX,
/* The sbuf with above ids are created each pcpu */
ACRN_SBUF_PER_PCPU_ID_MAX,
ACRN_ASYNCIO = 64,
};
/* Make sure sizeof(struct shared_buf) == SBUF_HEAD_SIZE */