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
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
--- /dev/null
+/* 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 */
*
*/
+#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)
{
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)
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,