mirror of
https://github.com/projectacrn/acrn-hypervisor.git
synced 2025-05-03 05:56:57 +00:00
5c9456462b
This patch adds an option CONFIG_KEEP_IRQ_DISABLED to hv (default n) and config-tool so that when this option is 'y', all interrupts in hv root mode will be permanently disabled. With this option to be 'y', all interrupts received in root mode will be handled in external interrupt vmexit after next VM entry. The postpone latency is negligible. This new configuration is a requirement from x86 TEE's secure/non-secure interrupt flow support. Many race conditions can be avoided when keeping IRQ off. v5: Rename CONFIG_ACRN_KEEP_IRQ_DISABLED to CONFIG_KEEP_IRQ_DISABLED v4: Change CPU_IRQ_ENABLE/DISABLE to CPU_IRQ_ENABLE_ON_CONFIG/DISABLE_ON_CONFIG and guard them using CONFIG_ACRN_KEEP_IRQ_DISABLED v3: CONFIG_ACRN_DISABLE_INTERRUPT -> CONFIG_ACRN_KEEP_IRQ_DISABLED Add more comment in commit message Tracked-On: #6571 Signed-off-by: Yifan Liu <yifan1.liu@intel.com> Reviewed-by: Wang, Yu1 <yu1.wang@intel.com> Acked-by: Anthony Xu <anthony.xu@intel.com>
66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
/*
|
|
* Copyright (C) 2018 Intel Corporation. All rights reserved.
|
|
*
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*/
|
|
|
|
#include <types.h>
|
|
#include <asm/lib/bits.h>
|
|
#include <asm/cpu.h>
|
|
#include <asm/per_cpu.h>
|
|
#include <softirq.h>
|
|
|
|
static softirq_handler softirq_handlers[NR_SOFTIRQS];
|
|
|
|
void init_softirq(void)
|
|
{
|
|
}
|
|
|
|
/*
|
|
* @pre: nr will not equal or large than NR_SOFTIRQS
|
|
*/
|
|
void register_softirq(uint16_t nr, softirq_handler handler)
|
|
{
|
|
softirq_handlers[nr] = handler;
|
|
}
|
|
|
|
/*
|
|
* @pre: nr will not equal or large than NR_SOFTIRQS
|
|
*/
|
|
void fire_softirq(uint16_t nr)
|
|
{
|
|
bitmap_set_lock(nr, &per_cpu(softirq_pending, get_pcpu_id()));
|
|
}
|
|
|
|
static void do_softirq_internal(uint16_t cpu_id)
|
|
{
|
|
volatile uint64_t *softirq_pending_bitmap =
|
|
&per_cpu(softirq_pending, cpu_id);
|
|
uint16_t nr = ffs64(*softirq_pending_bitmap);
|
|
|
|
while (nr < NR_SOFTIRQS) {
|
|
bitmap_clear_lock(nr, softirq_pending_bitmap);
|
|
(*softirq_handlers[nr])(cpu_id);
|
|
nr = ffs64(*softirq_pending_bitmap);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* @pre: this function will only be called with irq disabled
|
|
*/
|
|
void do_softirq(void)
|
|
{
|
|
uint16_t cpu_id = get_pcpu_id();
|
|
|
|
if (per_cpu(softirq_servicing, cpu_id) == 0U) {
|
|
per_cpu(softirq_servicing, cpu_id) = 1U;
|
|
|
|
CPU_IRQ_ENABLE_ON_CONFIG();
|
|
do_softirq_internal(cpu_id);
|
|
CPU_IRQ_DISABLE_ON_CONFIG();
|
|
|
|
do_softirq_internal(cpu_id);
|
|
per_cpu(softirq_servicing, cpu_id) = 0U;
|
|
}
|
|
}
|