lkml.org 
[lkml]   [2019]   [Jun]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip:x86/platform] x86/acrn: Use HYPERVISOR_CALLBACK_VECTOR for ACRN guest upcall vector
Commit-ID:  498ad39368865dfdbf15d3516c43694947074b88
Gitweb: https://git.kernel.org/tip/498ad39368865dfdbf15d3516c43694947074b88
Author: Zhao Yakui <yakui.zhao@intel.com>
AuthorDate: Tue, 30 Apr 2019 11:45:25 +0800
Committer: Borislav Petkov <bp@suse.de>
CommitDate: Tue, 11 Jun 2019 21:31:31 +0200

x86/acrn: Use HYPERVISOR_CALLBACK_VECTOR for ACRN guest upcall vector

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
---
arch/x86/Kconfig | 1 +
arch/x86/entry/entry_64.S | 5 +++++
arch/x86/include/asm/acrn.h | 11 +++++++++++
arch/x86/kernel/cpu/acrn.c | 30 ++++++++++++++++++++++++++++++
4 files changed, 47 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 8a95c50e5c12..0ddcce78f85c 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -838,6 +838,7 @@ 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 the ACRN hypervisor. ACRN is
a flexible, lightweight reference open-source hypervisor, built with
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 11aa3b2afa4d..2fe62893bbdf 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -1142,6 +1142,11 @@ 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=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
diff --git a/arch/x86/include/asm/acrn.h b/arch/x86/include/asm/acrn.h
new file mode 100644
index 000000000000..4adb13f08af7
--- /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
+
+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 */
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,
\
 
 \ /
  Last update: 2019-06-11 22:45    [W:0.078 / U:3.468 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site