Commit 498ad393 authored by Zhao Yakui's avatar Zhao Yakui Committed by Borislav Petkov
Browse files

x86/acrn: Use HYPERVISOR_CALLBACK_VECTOR for ACRN guest upcall vector 



Use the HYPERVISOR_CALLBACK_VECTOR to notify an ACRN guest.

Co-developed-by: default avatarJason Chen CJ <jason.cj.chen@intel.com>
Signed-off-by: default avatarJason Chen CJ <jason.cj.chen@intel.com>
Signed-off-by: default avatarZhao Yakui <yakui.zhao@intel.com>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/1559108037-18813-4-git-send-email-yakui.zhao@intel.com
parent ec7972c9

arch/x86/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -838,6 +838,7 @@ config JAILHOUSE_GUEST 
config ACRN_GUEST

	bool "ACRN Guest support"

	depends on X86_64

	select X86_HV_CALLBACK_VECTOR

	help

	  This option allows to run Linux as guest in the ACRN hypervisor. ACRN is

	  a flexible, lightweight reference open-source hypervisor, built with

arch/x86/entry/entry_64.S

+5 −0
Original line number Diff line number Diff line
@@ -1142,6 +1142,11 @@ apicinterrupt3 HYPERV_STIMER0_VECTOR \ 
	hv_stimer0_callback_vector hv_stimer0_vector_handler

#endif /* CONFIG_HYPERV */



#if IS_ENABLED(CONFIG_ACRN_GUEST)

apicinterrupt3 HYPERVISOR_CALLBACK_VECTOR \

	acrn_hv_callback_vector acrn_hv_vector_handler

#endif



idtentry debug			do_debug		has_error_code=0	paranoid=1 shift_ist=IST_INDEX_DB ist_offset=DB_STACK_OFFSET

idtentry int3			do_int3			has_error_code=0	create_gap=1

idtentry stack_segment		do_stack_segment	has_error_code=1

arch/x86/include/asm/acrn.h

0 → 100644
+11 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _ASM_X86_ACRN_H

#define _ASM_X86_ACRN_H



extern void acrn_hv_callback_vector(void);

#ifdef CONFIG_TRACING

#define trace_acrn_hv_callback_vector acrn_hv_callback_vector

#endif



extern void acrn_hv_vector_handler(struct pt_regs *regs);

#endif /* _ASM_X86_ACRN_H */

arch/x86/kernel/cpu/acrn.c

+30 −0
Original line number Diff line number Diff line
@@ -9,7 +9,12 @@ 
 *

 */



#include <linux/interrupt.h>

#include <asm/acrn.h>

#include <asm/apic.h>

#include <asm/desc.h>

#include <asm/hypervisor.h>

#include <asm/irq_regs.h>



static uint32_t __init acrn_detect(void)

{
@@ -18,6 +23,8 @@ static uint32_t __init acrn_detect(void) 


static void __init acrn_init_platform(void)

{

	/* Setup the IDT for ACRN hypervisor callback */

	alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, acrn_hv_callback_vector);

}



static bool acrn_x2apic_available(void)
@@ -30,6 +37,29 @@ static bool acrn_x2apic_available(void) 
	return false;

}



static void (*acrn_intr_handler)(void);



__visible void __irq_entry acrn_hv_vector_handler(struct pt_regs *regs)

{

	struct pt_regs *old_regs = set_irq_regs(regs);



	/*

	 * The hypervisor requires that the APIC EOI should be acked.

	 * If the APIC EOI is not acked, the APIC ISR bit for the

	 * HYPERVISOR_CALLBACK_VECTOR will not be cleared and then it

	 * will block the interrupt whose vector is lower than

	 * HYPERVISOR_CALLBACK_VECTOR.

	 */

	entering_ack_irq();

	inc_irq_stat(irq_hv_callback_count);



	if (acrn_intr_handler)

		acrn_intr_handler();



	exiting_irq();

	set_irq_regs(old_regs);

}



const __initconst struct hypervisor_x86 x86_hyper_acrn = {

	.name                   = "ACRN",

	.detect                 = acrn_detect,

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