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Diffstat (limited to 'arch/x86/kernel/cpu/acrn.c')
| -rw-r--r-- | arch/x86/kernel/cpu/acrn.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/acrn.c b/arch/x86/kernel/cpu/acrn.c new file mode 100644 index 000000000..0b2c03943 --- /dev/null +++ b/arch/x86/kernel/cpu/acrn.c @@ -0,0 +1,64 @@ +// 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/apic.h> +#include <asm/cpufeatures.h> +#include <asm/desc.h> +#include <asm/hypervisor.h> +#include <asm/idtentry.h> +#include <asm/irq_regs.h> + +static u32 __init acrn_detect(void) +{ + return hypervisor_cpuid_base("ACRNACRNACRN", 0); +} + +static void __init acrn_init_platform(void) +{ + /* Setup the IDT for ACRN hypervisor callback */ + alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, asm_sysvec_acrn_hv_callback); +} + +static bool acrn_x2apic_available(void) +{ + return boot_cpu_has(X86_FEATURE_X2APIC); +} + +static void (*acrn_intr_handler)(void); + +DEFINE_IDTENTRY_SYSVEC(sysvec_acrn_hv_callback) +{ + 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. + */ + ack_APIC_irq(); + inc_irq_stat(irq_hv_callback_count); + + if (acrn_intr_handler) + acrn_intr_handler(); + + 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, +}; |