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x86/acrn: Use HYPERVISOR_CALLBACK_VECTOR for ACRN guest upcall vector

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Use the HYPERVISOR_CALLBACK_VECTOR to notify an ACRN guest.

Co-developed-by: Jason Chen CJ <jason.cj.chen@intel.com>
Signed-off-by: Jason Chen CJ <jason.cj.chen@intel.com>
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Thomas 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
This commit is contained in:
Zhao Yakui 2019-04-30 11:45:25 +08:00 committed by Borislav Petkov
parent ec7972c99f
commit 498ad39368
4 changed files with 47 additions and 0 deletions
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1
arch/x86/Kconfig
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@ -838,6 +838,7 @@ config JAILHOUSE_GUEST
config ACRN_GUEST config ACRN_GUEST
bool "ACRN Guest support" bool "ACRN Guest support"
depends on X86_64 depends on X86_64
select X86_HV_CALLBACK_VECTOR
help help
This option allows to run Linux as guest in the ACRN hypervisor. ACRN is This option allows to run Linux as guest in the ACRN hypervisor. ACRN is
a flexible, lightweight reference open-source hypervisor, built with a flexible, lightweight reference open-source hypervisor, built with

5
arch/x86/entry/entry_64.S
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@ -1142,6 +1142,11 @@ apicinterrupt3 HYPERV_STIMER0_VECTOR \
hv_stimer0_callback_vector hv_stimer0_vector_handler hv_stimer0_callback_vector hv_stimer0_vector_handler
#endif /* CONFIG_HYPERV */ #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 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 int3 do_int3 has_error_code=0 create_gap=1
idtentry stack_segment do_stack_segment has_error_code=1 idtentry stack_segment do_stack_segment has_error_code=1

11
arch/x86/include/asm/acrn.h Normal file
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@ -0,0 +1,11 @@
/* 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 */

30
arch/x86/kernel/cpu/acrn.c
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@ -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/hypervisor.h>
#include <asm/irq_regs.h>
static uint32_t __init acrn_detect(void) 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) 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) static bool acrn_x2apic_available(void)
@ -30,6 +37,29 @@ static bool acrn_x2apic_available(void)
return false; 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 = { const __initconst struct hypervisor_x86 x86_hyper_acrn = {
.name = "ACRN", .name = "ACRN",
.detect = acrn_detect, .detect = acrn_detect,