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mirror_ubuntu-kernels/arch/riscv/kvm
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Anup Patel be82abe6a7 RISC-V: KVM: Fix SRCU deadlock caused by kvm_riscv_check_vcpu_requests() 
The kvm_riscv_check_vcpu_requests() is called with SRCU read lock held
and for KVM_REQ_SLEEP request it will block the VCPU without releasing
SRCU read lock. This causes KVM ioctls (such as KVM_IOEVENTFD) from
other VCPUs of the same Guest/VM to hang/deadlock if there is any
synchronize_srcu() or synchronize_srcu_expedited() in the path.

To fix the above in kvm_riscv_check_vcpu_requests(), we should do SRCU
read unlock before blocking the VCPU and do SRCU read lock after VCPU
wakeup.

Fixes: cce69aff68 ("RISC-V: KVM: Implement VCPU interrupts and requests handling")
Reported-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Tested-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
2022-07-11 09:36:32 +05:30
..
Kconfig riscv: do not select non-existing config ANON_INODES 2021-10-22 05:53:37 -04:00
main.c RISC-V: KVM: Add Sv57x4 mode support for G-stage 2022-05-20 09:09:04 +05:30
Makefile RISC-V: KVM: Add SBI HSM extension in KVM 2022-01-06 15:12:47 +05:30
mmu.c riscv: Fix missing PAGE_PFN_MASK 2022-07-11 09:33:35 +05:30
tlb.c RISC-V: KVM: Cleanup stale TLB entries when host CPU changes 2022-05-20 09:09:18 +05:30
vcpu_exit.c RISC-V: KVM: Use G-stage name for hypervisor page table 2022-05-20 09:09:01 +05:30
vcpu_fp.c RISC-V: KVM: include missing hwcap.h into vcpu_fp 2022-04-09 09:16:00 +05:30
vcpu_sbi_base.c RISC-V: KVM: Fix SBI implementation version 2022-02-02 18:58:06 +05:30
vcpu_sbi_hsm.c RISC-V: KVM: Implement SBI HSM suspend call 2022-03-11 19:02:39 +05:30
vcpu_sbi_replace.c RISC-V: KVM: Add remote HFENCE functions based on VCPU requests 2022-05-20 09:09:15 +05:30
vcpu_sbi_v01.c RISC-V: KVM: Add remote HFENCE functions based on VCPU requests 2022-05-20 09:09:15 +05:30
vcpu_sbi.c KVM: fix bad user ABI for KVM_EXIT_SYSTEM_EVENT 2022-04-29 12:38:22 -04:00
vcpu_switch.S RISC-V: KVM: Refine __kvm_riscv_switch_to() implementation 2022-03-11 19:02:22 +05:30
vcpu_timer.c RISC-V: KVM: remove unneeded semicolon 2021-11-01 17:35:13 +05:30
vcpu.c RISC-V: KVM: Fix SRCU deadlock caused by kvm_riscv_check_vcpu_requests() 2022-07-11 09:36:32 +05:30
vm.c RISC-V: KVM: Use G-stage name for hypervisor page table 2022-05-20 09:09:01 +05:30
vmid.c RISC-V: KVM: fix typos in comments 2022-06-09 09:18:15 +05:30