Wanpeng Li da6d63a006 KVM: X86: hyper-v: Task srcu lock when accessing kvm_memslots() ... WARNING: suspicious RCU usage 5.13.0-rc1 #4 Not tainted ----------------------------- ./include/linux/kvm_host.h:710 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by hyperv_clock/8318: #0: ffffb6b8cb05a7d8 (&hv->hv_lock){+.+.}-{3:3}, at: kvm_hv_invalidate_tsc_page+0x3e/0xa0 [kvm] stack backtrace: CPU: 3 PID: 8318 Comm: hyperv_clock Not tainted 5.13.0-rc1 #4 Call Trace: dump_stack+0x87/0xb7 lockdep_rcu_suspicious+0xce/0xf0 kvm_write_guest_page+0x1c1/0x1d0 [kvm] kvm_write_guest+0x50/0x90 [kvm] kvm_hv_invalidate_tsc_page+0x79/0xa0 [kvm] kvm_gen_update_masterclock+0x1d/0x110 [kvm] kvm_arch_vm_ioctl+0x2a7/0xc50 [kvm] kvm_vm_ioctl+0x123/0x11d0 [kvm] __x64_sys_ioctl+0x3ed/0x9d0 do_syscall_64+0x3d/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae kvm_memslots() will be called by kvm_write_guest(), so we should take the srcu lock. Fixes: e880c6ea5 (KVM: x86: hyper-v: Prevent using not-yet-updated TSC page by secondary CPUs) Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com> Signed-off-by: Wanpeng Li <wanpengli@tencent.com> Message-Id: <1621339235-11131-4-git-send-email-wanpengli@tencent.com> Reviewed-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>		2021-05-27 07:45:53 -04:00
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alpha
arc
arm	Kbuild updates for v5.13 (2nd)	2021-05-08 10:00:11 -07:00
arm64	KVM: arm64: Fix debug register indexing	2021-05-15 10:27:59 +01:00
csky
h8300
hexagon
ia64
m68k	Kbuild updates for v5.13 (2nd)	2021-05-08 10:00:11 -07:00
microblaze
mips	Kbuild updates for v5.13 (2nd)	2021-05-08 10:00:11 -07:00
nds32
nios2
openrisc
parisc	Kbuild updates for v5.13 (2nd)	2021-05-08 10:00:11 -07:00
powerpc	KVM: PPC: exit halt polling on need_resched()	2021-05-27 07:45:50 -04:00
riscv
s390
sh	Kbuild updates for v5.13 (2nd)	2021-05-08 10:00:11 -07:00
sparc	Kbuild updates for v5.13 (2nd)	2021-05-08 10:00:11 -07:00
um
x86	KVM: X86: hyper-v: Task srcu lock when accessing kvm_memslots()	2021-05-27 07:45:53 -04:00
xtensa	Kbuild updates for v5.13 (2nd)	2021-05-08 10:00:11 -07:00
.gitignore
Kconfig