diff options
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/cpu/acrn.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/acrn.c b/arch/x86/kernel/cpu/acrn.c index 6d365e97cce6..676022e71791 100644 --- a/arch/x86/kernel/cpu/acrn.c +++ b/arch/x86/kernel/cpu/acrn.c @@ -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, |