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When we enable lockdep we get such a warning:
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WARNING: suspicious RCU usage
6.12.0-rc7+ #1891 Tainted: G W
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arch/loongarch/kvm/../../../virt/kvm/kvm_main.c:5945 suspicious rcu_dereference_check() usage!
other info that might help us debug this:
rcu_scheduler_active = 2, debug_locks = 1
1 lock held by qemu-system-loo/948:
#0: 90000001184a00a8 (&vcpu->mutex){+.+.}-{4:4}, at: kvm_vcpu_ioctl+0xf4/0xe20 [kvm]
stack backtrace:
CPU: 2 UID: 0 PID: 948 Comm: qemu-system-loo Tainted: G W 6.12.0-rc7+ #1891
Tainted: [W]=WARN
Hardware name: Loongson Loongson-3A5000-7A1000-1w-CRB/Loongson-LS3A5000-7A1000-1w-CRB, BIOS vUDK2018-LoongArch-V2.0.0-prebeta9 10/21/2022
Stack : 0000000000000089 9000000005a0db9c 90000000071519c8 900000012c578000
900000012c57b940 0000000000000000 900000012c57b948 9000000007e53788
900000000815bcc8 900000000815bcc0 900000012c57b7b0 0000000000000001
0000000000000001 4b031894b9d6b725 0000000005dec000 9000000100427b00
00000000000003d2 0000000000000001 000000000000002d 0000000000000003
0000000000000030 00000000000003b4 0000000005dec000 0000000000000000
900000000806d000 9000000007e53788 00000000000000b4 0000000000000004
0000000000000004 0000000000000000 0000000000000000 9000000107baf600
9000000008916000 9000000007e53788 9000000005924778 000000001fe001e5
00000000000000b0 0000000000000007 0000000000000000 0000000000071c1d
...
Call Trace:
[<9000000005924778>] show_stack+0x38/0x180
[<90000000071519c4>] dump_stack_lvl+0x94/0xe4
[<90000000059eb754>] lockdep_rcu_suspicious+0x194/0x240
[<ffff80000221f47c>] kvm_io_bus_read+0x19c/0x1e0 [kvm]
[<ffff800002225118>] kvm_emu_mmio_read+0xd8/0x440 [kvm]
[<ffff8000022254bc>] kvm_handle_read_fault+0x3c/0xe0 [kvm]
[<ffff80000222b3c8>] kvm_handle_exit+0x228/0x480 [kvm]
Fix it by protecting kvm_io_bus_{read,write}() with SRCU.
Cc: stable@vger.kernel.org
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Enable the KVM_IRQ_ROUTING/KVM_IRQCHIP/KVM_MSI configuration items,
add the KVM_CAP_IRQCHIP capability, and implement the query interface
of the in-kernel irqchip.
Signed-off-by: Xianglai Li <lixianglai@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Implement the communication interface between the user mode programs
and the kernel in PCHPIC interrupt control simulation, which is used
to obtain or send the simulation data of the interrupt controller in
the user mode process, and is also used in VM migration or VM saving
and restoration.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: Xianglai Li <lixianglai@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Add implementation of IPI interrupt controller's address space read and
write function simulation.
Implement interrupt injection interface under loongarch.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: Xianglai Li <lixianglai@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Add device model for PCHPIC interrupt controller, implemente basic
create & destroy interface, and register device model to kvm device
table.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: Xianglai Li <lixianglai@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Implement the communication interface between the user mode programs
and the kernel in EIOINTC interrupt controller simulation, which is
used to obtain or send the simulation data of the interrupt controller
in the user mode process, and is also used in VM migration or VM saving
and restoration.
Signed-off-by: Xianglai Li <lixianglai@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Add implementation of EIOINTC interrupt controller's address space read
and write function simulation.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: Xianglai Li <lixianglai@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Add device model for EIOINTC interrupt controller, implement basic
create & destroy interfaces, and register device model to kvm device
table.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: Xianglai Li <lixianglai@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Implement the communication interface between the user mode programs
and the kernel in IPI interrupt controller simulation, which is used
to obtain or send the simulation data of the interrupt controller in
the user mode process, and is also used in VM migration or VM saving
and restoration.
Signed-off-by: Min Zhou <zhoumin@loongson.cn>
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: Xianglai Li <lixianglai@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Add implementation of IPI interrupt controller's address space read and
write function simulation.
Signed-off-by: Min Zhou <zhoumin@loongson.cn>
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: Xianglai Li <lixianglai@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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Add device model for IPI interrupt controller, implement basic create &
destroy interfaces, and register device model to kvm device table.
Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
Signed-off-by: Xianglai Li <lixianglai@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
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