From: Shuo Liu <[email protected]> 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 <[email protected]> Signed-off-by: Shuo Liu <[email protected]> Reviewed-by: Zhi Wang <[email protected]> Reviewed-by: Reinette Chatre <[email protected]> Acked-by: Borislav Petkov <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Sean Christopherson <[email protected]> Cc: Dan Williams <[email protected]> Cc: Fengwei Yin <[email protected]> Cc: Zhi Wang <[email protected]> Cc: Zhenyu Wang <[email protected]> Cc: Yu Wang <[email protected]> Cc: Reinette Chatre <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> --- 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
