Huacai Chen 7f71507851 LoongArch: KVM: Protect kvm_io_bus_{read,write}() with SRCU ... When we enable lockdep we get such a warning: ============================= WARNING: suspicious RCU usage 6.12.0-rc7+ #1891 Tainted: G W ----------------------------- 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>		2024-12-03 19:49:28 +08:00
..
intc	LoongArch: KVM: Protect kvm_io_bus_{read,write}() with SRCU	2024-12-03 19:49:28 +08:00
exit.c	LoongArch: KVM: Protect kvm_io_bus_{read,write}() with SRCU	2024-12-03 19:49:28 +08:00
interrupt.c	LoongArch: KVM: Implement vcpu interrupt operations	2023-10-02 10:01:28 +08:00
irqfd.c	LoongArch: KVM: Add irqfd support	2024-11-13 16:18:27 +08:00
Kconfig	LoongArch: KVM: Add irqfd support	2024-11-13 16:18:27 +08:00
main.c	LoongArch: KVM: Add PCHPIC device support	2024-11-13 16:18:27 +08:00
Makefile	LoongArch: KVM: Add irqfd support	2024-11-13 16:18:27 +08:00
mmu.c	KVM: LoongArch: Use kvm_faultin_pfn() to map pfns into the guest	2024-10-25 13:00:49 -04:00
switch.S	LoongArch: Add ifdefs to fix LSX and LASX related warnings	2024-08-26 23:11:32 +08:00
timer.c	LoongArch: KVM: Mark hrtimer to expire in hard interrupt context	2024-10-23 22:15:44 +08:00
tlb.c	LoongArch: KVM: Delay secondary mmu tlb flush until guest entry	2024-07-09 16:25:50 +08:00
trace.h	LoongArch: KVM: Add mmio trace events support	2024-05-06 22:00:47 +08:00
vcpu.c	LoongArch: KVM: Protect kvm_check_requests() with SRCU	2024-12-02 16:42:10 +08:00
vm.c	LoongArch: KVM: Add irqfd support	2024-11-13 16:18:27 +08:00