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Subject[RFC PATCH v4 3/4] x86/acrn: Use HYPERVISOR_CALLBACK_VECTOR for ACRN guest upcall vector
Date
Linux kernel uses the HYPERVISOR_CALLBACK_VECTOR for hypervisor upcall
vector. And it is already used for Xen and HyperV.
After ACRN hypervisor is detected, it will also use this defined vector
to notify kernel.

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>
---
V1->V2: Remove the unused API definition of acrn_setup_intr_handler and
acrn_remove_intr_handler.
Adjust the order of header file
Add the declaration of acrn_hv_vector_handler and tracing
definition of acrn_hv_callback_vector.

v2->v3: Select the X86_HV_CALLBACK_VECTOR for ACRN guest
v3->v4: Refine the file name of acrnhyper.h to acrn.h
---
arch/x86/Kconfig | 1 +
arch/x86/entry/entry_64.S | 5 +++++
arch/x86/include/asm/acrn.h | 11 +++++++++++
arch/x86/kernel/cpu/acrn.c | 22 ++++++++++++++++++++++
4 files changed, 39 insertions(+)
create mode 100644 arch/x86/include/asm/acrn.h

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index b33bfe5..4bad72c 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -848,6 +848,7 @@ config JAILHOUSE_GUEST
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 ACRN hypervisor. Enabling
this will allow the kernel to boot in virtualized environment under
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 1f0efdb..d1b8ad3 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1129,6 +1129,11 @@ apicinterrupt3 HYPERV_STIMER0_VECTOR \
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=DEBUG_STACK
idtentry int3 do_int3 has_error_code=0
idtentry stack_segment do_stack_segment has_error_code=1
diff --git a/arch/x86/include/asm/acrn.h b/arch/x86/include/asm/acrn.h
new file mode 100644
index 0000000..43ab032
--- /dev/null
+++ b/arch/x86/include/asm/acrn.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_ACRN_H
+#define _ASM_X86_ACRN_H
+
+void acrn_hv_callback_vector(void);
+#ifdef CONFIG_TRACING
+#define trace_acrn_hv_callback_vector acrn_hv_callback_vector
+#endif
+
+void acrn_hv_vector_handler(struct pt_regs *regs);
+#endif /* _ASM_X86_ACRN_H */
diff --git a/arch/x86/kernel/cpu/acrn.c b/arch/x86/kernel/cpu/acrn.c
index f556640..d8072bf 100644
--- a/arch/x86/kernel/cpu/acrn.c
+++ b/arch/x86/kernel/cpu/acrn.c
@@ -9,7 +9,11 @@
*
*/

+#include <linux/interrupt.h>
+#include <asm/acrn.h>
+#include <asm/desc.h>
#include <asm/hypervisor.h>
+#include <asm/irq_regs.h>

static uint32_t __init acrn_detect(void)
{
@@ -18,6 +22,8 @@ static uint32_t __init acrn_detect(void)

static void __init acrn_init_platform(void)
{
+ alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR,
+ acrn_hv_callback_vector);
}

static bool acrn_x2apic_available(void)
@@ -30,6 +36,22 @@ 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);
+
+ 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,
--
2.7.4
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