Before this, the interrupt controller simulation has been completed
in the user mode program. In order to reduce the loss caused by frequent
switching of the virtual machine monitor from kernel mode to user mode
when the guest accesses the interrupt controller, we add the interrupt
controller simulation in kvm.
The following is a virtual machine simulation diagram of interrupted
connections:
+-----+ +---------+ +-------+
| IPI |--> | CPUINTC | <-- | Timer |
+-----+ +---------+ +-------+
^
|
+---------+
| EIOINTC |
+---------+
^ ^
| |
+---------+ +---------+
| PCH-PIC | | PCH-MSI |
+---------+ +---------+
^ ^ ^
| | |
+--------+ +---------+ +---------+
| UARTs | | Devices | | Devices |
+--------+ +---------+ +---------+
In this series of patches, we mainly realized the simulation of
IPI EXTIOI PCH-PIC interrupt controller.
The simulation of IPI EXTIOI PCH-PIC interrupt controller mainly
completes the creation simulation of the interrupt controller,
the register address space read and write simulation,
and the interface with user mode to obtain and set the interrupt
controller state for the preservation,
recovery and migration of virtual machines.
IPI simulation implementation reference:
https://github.com/loongson/LoongArch-Documentation/tree/main/docs/Loongson-3A5000-usermanual-EN/inter-processor-interrupts-and-communication
EXTIOI simulation implementation reference:
https://github.com/loongson/LoongArch-Documentation/tree/main/docs/Loongson-3A5000-usermanual-EN/io-interrupts/extended-io-interrupts
PCH-PIC simulation implementation reference:
https://github.com/loongson/LoongArch-Documentation/blob/main/docs/Loongson-7A1000-usermanual-EN/interrupt-controller.adoc
For PCH-MSI, we used irqfd mechanism to send the interrupt signal
generated by user state to kernel state and then to EXTIOI without
maintaining PCH-MSI state in kernel state.
You can easily get the code from the link below:
the kernel:
https://github.com/lixianglai/linux
the branch is: interrupt
the qemu:
https://github.com/lixianglai/qemu
the branch is: interrupt
Please note that the code above is regularly updated based on community
reviews.
change log:
V1->V2:
1.Remove redundant blank lines according to community comments
2.Remove simplified redundant code
3.Adds 16 bits of read/write interface to the extioi iocsr address space
4.Optimize user - and kernel-mode data access interfaces: Access
fixed length data each time to prevent memory overruns
5.Added virtual extioi, where interrupts can be routed to cpus other than cpu 4
Cc: Bibo Mao <maobibo@xxxxxxxxxxx>
Cc: Huacai Chen <chenhuacai@xxxxxxxxxx>
Cc: kvm@xxxxxxxxxxxxxxx
Cc: loongarch@xxxxxxxxxxxxxxx
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Tianrui Zhao <zhaotianrui@xxxxxxxxxxx>
Cc: WANG Xuerui <kernel@xxxxxxxxxx>
Cc: Xianglai li <lixianglai@xxxxxxxxxxx>
Xianglai Li (10):
LoongArch: KVM: Add iocsr and mmio bus simulation in kernel
LoongArch: KVM: Add IPI device support
LoongArch: KVM: Add IPI read and write function
LoongArch: KVM: Add IPI user mode read and write function
LoongArch: KVM: Add EXTIOI device support
LoongArch: KVM: Add EXTIOI read and write functions
LoongArch: KVM: Add PCHPIC device support
LoongArch: KVM: Add PCHPIC read and write functions
LoongArch: KVM: Add PCHPIC user mode read and write functions
LoongArch: KVM: Add irqfd support
arch/loongarch/include/asm/kvm_extioi.h | 122 +++
arch/loongarch/include/asm/kvm_host.h | 30 +
arch/loongarch/include/asm/kvm_ipi.h | 52 ++
arch/loongarch/include/asm/kvm_pch_pic.h | 61 ++
arch/loongarch/include/uapi/asm/kvm.h | 19 +
arch/loongarch/kvm/Kconfig | 3 +
arch/loongarch/kvm/Makefile | 4 +
arch/loongarch/kvm/exit.c | 86 +-
arch/loongarch/kvm/intc/extioi.c | 1056 ++++++++++++++++++++++
arch/loongarch/kvm/intc/ipi.c | 510 +++++++++++
arch/loongarch/kvm/intc/pch_pic.c | 521 +++++++++++
arch/loongarch/kvm/irqfd.c | 87 ++
arch/loongarch/kvm/main.c | 18 +-
arch/loongarch/kvm/vcpu.c | 3 +
arch/loongarch/kvm/vm.c | 53 +-
include/linux/kvm_host.h | 1 +
include/trace/events/kvm.h | 35 +
include/uapi/linux/kvm.h | 8 +
18 files changed, 2641 insertions(+), 28 deletions(-)
create mode 100644 arch/loongarch/include/asm/kvm_extioi.h
create mode 100644 arch/loongarch/include/asm/kvm_ipi.h
create mode 100644 arch/loongarch/include/asm/kvm_pch_pic.h
create mode 100644 arch/loongarch/kvm/intc/extioi.c
create mode 100644 arch/loongarch/kvm/intc/ipi.c
create mode 100644 arch/loongarch/kvm/intc/pch_pic.c
create mode 100644 arch/loongarch/kvm/irqfd.c
base-commit: 872cf28b8df9c5c3a1e71a88ee750df7c2513971
--
2.39.1
