From: Shuo Liu <shuo.a....@intel.com>
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.
Originally-by: Yakui Zhao <yakui.z...@intel.com>
Signed-off-by: Shuo Liu <shuo.a....@intel.com>
Reviewed-by: Zhi Wang <zhi.a.w...@intel.com>
Reviewed-by: Reinette Chatre <reinette.cha...@intel.com>
Acked-by: Borislav Petkov <b...@suse.de>
Cc: Dave Hansen <dave.han...@intel.com>
Cc: Sean Christopherson <sean.j.christopher...@intel.com>
Cc: Dan Williams <dan.j.willi...@intel.com>
Cc: Fengwei Yin <fengwei....@intel.com>
Cc: Zhi Wang <zhi.a.w...@intel.com>
Cc: Zhenyu Wang <zhen...@linux.intel.com>
Cc: Yu Wang <yu1.w...@intel.com>
Cc: Reinette Chatre <reinette.cha...@intel.com>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/x86/include/asm/acrn.h | 8 ++++++++
arch/x86/kernel/cpu/acrn.c | 14 ++++++++++++++
2 files changed, 22 insertions(+)
create mode 100644 arch/x86/include/asm/acrn.h
diff --git a/arch/x86/include/asm/acrn.h b/arch/x86/include/asm/acrn.h
new file mode 100644
index 000000000000..ff259b69cde7
--- /dev/null
+++ b/arch/x86/include/asm/acrn.h
@@ -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 */
diff --git a/arch/x86/kernel/cpu/acrn.c b/arch/x86/kernel/cpu/acrn.c
index 0b2c03943ac6..e0c181781905 100644
--- a/arch/x86/kernel/cpu/acrn.c
+++ b/arch/x86/kernel/cpu/acrn.c
@@ -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,
--
2.28.0
