mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
498ad39368
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
70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* ACRN detection support
|
|
*
|
|
* Copyright (C) 2019 Intel Corporation. All rights reserved.
|
|
*
|
|
* Jason Chen CJ <jason.cj.chen@intel.com>
|
|
* Zhao Yakui <yakui.zhao@intel.com>
|
|
*
|
|
*/
|
|
|
|
#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)
|
|
{
|
|
return hypervisor_cpuid_base("ACRNACRNACRN\0\0", 0);
|
|
}
|
|
|
|
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)
|
|
{
|
|
/*
|
|
* x2apic is not supported for now. Future enablement will have to check
|
|
* X86_FEATURE_X2APIC to determine whether x2apic is supported in the
|
|
* guest.
|
|
*/
|
|
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,
|
|
.type = X86_HYPER_ACRN,
|
|
.init.init_platform = acrn_init_platform,
|
|
.init.x2apic_available = acrn_x2apic_available,
|
|
};
|