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https://github.com/projectacrn/acrn-hypervisor.git
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12bfa98a37
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>
41 lines
853 B
C
41 lines
853 B
C
/*
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* SHARED BUFFER
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*
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* Copyright (C) 2017-2022 Intel Corporation.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Li Fei <fei1.li@intel.com>
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*
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*/
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#include <types.h>
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#include <rtl.h>
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#include <errno.h>
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#include <asm/cpu.h>
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#include <asm/per_cpu.h>
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int32_t sbuf_share_setup(uint16_t pcpu_id, uint32_t sbuf_id, uint64_t *hva)
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{
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if ((pcpu_id >= get_pcpu_nums()) || (sbuf_id >= ACRN_SBUF_PER_PCPU_ID_MAX)) {
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return -EINVAL;
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}
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per_cpu(sbuf, pcpu_id)[sbuf_id] = (struct shared_buf *) hva;
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pr_info("%s share sbuf for pCPU[%u] with sbuf_id[%u] setup successfully",
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__func__, pcpu_id, sbuf_id);
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return 0;
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}
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void sbuf_reset(void)
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{
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uint16_t pcpu_id, sbuf_id;
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for (pcpu_id = 0U; pcpu_id < get_pcpu_nums(); pcpu_id++) {
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for (sbuf_id = 0U; sbuf_id < ACRN_SBUF_PER_PCPU_ID_MAX; sbuf_id++) {
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per_cpu(sbuf, pcpu_id)[sbuf_id] = 0U;
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}
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}
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}
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