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x86/acrn: Introduce acrn_{setup, remove}_intr_handler()

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The ACRN Hypervisor builds an I/O request when a trapped I/O access
happens in User VM. Then, ACRN Hypervisor issues an upcall by sending
a notification interrupt to the Service VM. HSM in the Service VM needs
to hook the notification interrupt to handle I/O requests.

Notification interrupts from ACRN Hypervisor are already supported and
a, currently uninitialized, callback called.

Export two APIs for HSM to setup/remove its callback.

Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Fengwei Yin <fengwei.yin@intel.com>
Cc: Zhi Wang <zhi.a.wang@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Yu Wang <yu1.wang@intel.com>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Originally-by: Yakui Zhao <yakui.zhao@intel.com>
Reviewed-by: Zhi Wang <zhi.a.wang@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Acked-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Link: https://lore.kernel.org/r/20210207031040.49576-3-shuo.a.liu@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Shuo Liu 2021-02-07 11:10:24 +08:00 committed by Greg Kroah-Hartman
parent c619a804cc
commit 7995700e65
2 changed files with 22 additions and 0 deletions
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8
arch/x86/include/asm/acrn.h Normal file
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@ -0,0 +1,8 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_ACRN_H
#define _ASM_X86_ACRN_H
void acrn_setup_intr_handler(void (*handler)(void));
void acrn_remove_intr_handler(void);
#endif /* _ASM_X86_ACRN_H */

14
arch/x86/kernel/cpu/acrn.c
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@ -10,6 +10,8 @@
*/
#include <linux/interrupt.h>
#include <asm/acrn.h>
#include <asm/apic.h>
#include <asm/cpufeatures.h>
#include <asm/desc.h>
@ -55,6 +57,18 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_acrn_hv_callback)
set_irq_regs(old_regs);
}
void acrn_setup_intr_handler(void (*handler)(void))
{
acrn_intr_handler = handler;
}
EXPORT_SYMBOL_GPL(acrn_setup_intr_handler);
void acrn_remove_intr_handler(void)
{
acrn_intr_handler = NULL;
}
EXPORT_SYMBOL_GPL(acrn_remove_intr_handler);
const __initconst struct hypervisor_x86 x86_hyper_acrn = {
.name = "ACRN",
.detect = acrn_detect,