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| author | Zhao Yakui <yakui.zhao@intel.com> | 2019-04-30 05:45:25 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2019-06-11 21:31:31 +0200 |
| commit | 498ad39368865dfdbf15d3516c43694947074b88 (patch) | |
| tree | 036596e6c6370a2742b13fc572f60effb9eac618 /arch | |
| parent | x86: Add support for Linux guests on an ACRN hypervisor (diff) | |
| download | linux-498ad39368865dfdbf15d3516c43694947074b88.tar.xz linux-498ad39368865dfdbf15d3516c43694947074b88.zip | |
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
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/Kconfig | 1 | ||||
| -rw-r--r-- | arch/x86/entry/entry_64.S | 5 | ||||
| -rw-r--r-- | arch/x86/include/asm/acrn.h | 11 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/acrn.c | 30 |
4 files changed, 47 insertions, 0 deletions
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, |