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linux/arch/x86/kvm
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Paolo Bonzini 0e2dba8c0e KVM: x86: fix deadlock for KVM_XEN_EVTCHN_RESET 
[ Upstream commit a79b53aaaa ]

While KVM_XEN_EVTCHN_RESET is usually called with no vCPUs running,
if that happened it could cause a deadlock.  This is due to
kvm_xen_eventfd_reset() doing a synchronize_srcu() inside
a kvm->lock critical section.

To avoid this, first collect all the evtchnfd objects in an
array and free all of them once the kvm->lock critical section
is over and th SRCU grace period has expired.

Reported-by: Michal Luczaj <mhal@rbox.co>
Cc: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2023-02-25 11:25:40 +01:00
..
mmu KVM: x86/mmu: Fix race condition in direct_page_fault 2022-11-23 18:50:08 -05:00
svm KVM: SVM: Skip WRMSR fastpath on VM-Exit if next RIP isn't valid 2023-02-25 11:25:40 +01:00
vmx KVM: VMX: Execute IBPB on emulated VM-exit when guest has IBRS 2023-02-25 11:25:40 +01:00
.gitignore KVM: x86: use a separate asm-offsets.c file 2022-11-09 12:10:17 -05:00
cpuid.c KVM: x86: Do not return host topology information from KVM_GET_SUPPORTED_CPUID 2023-01-18 11:58:10 +01:00
cpuid.h KVM: x86: Add dedicated helper to get CPUID entry with significant index 2022-07-14 11:38:32 -04:00
debugfs.c KVM: x86: Reduce refcount if single_open() fails in kvm_mmu_rmaps_stat_open() 2022-10-27 04:41:54 -04:00
emulate.c KVM: x86: smm: number of GPRs in the SMRAM image depends on the image format 2022-10-28 06:10:30 -04:00
fpu.h KVM: x86: Move FPU register accessors into fpu.h 2021-06-17 13:09:24 -04:00
hyperv.c KVM: nVMX: Support PERF_GLOBAL_CTRL with enlightened VMCS 2022-09-26 12:02:47 -04:00
hyperv.h KVM: x86: Report error when setting CPUID if Hyper-V allocation fails 2022-09-26 12:02:39 -04:00
i8254.c KVM: x86: PIT: Preserve state of speaker port data bit 2022-06-08 13:06:20 -04:00
i8254.h KVM: x86: PIT: Preserve state of speaker port data bit 2022-06-08 13:06:20 -04:00
i8259.c KVM: x86/i8259: Remove a dead store of irq in a conditional block 2022-04-02 05:41:19 -04:00
ioapic.c KVM: x86/ioapic: Remove unused "addr" and "length" of ioapic_read_indirect() 2022-02-10 13:47:13 -05:00
ioapic.h x86/kvm: remove unused ack_notifier callbacks 2021-11-18 07:05:57 -05:00
irq.c KVM: x86/xen: handle PV timers oneshot mode 2022-04-02 05:41:16 -04:00
irq.h x86/kvm: remove unused ack_notifier callbacks 2021-11-18 07:05:57 -05:00
irq_comm.c KVM: x86/xen: Make kvm_xen_set_evtchn() reusable from other places 2022-04-02 05:41:14 -04:00
Kconfig KVM: x86: Select CONFIG_HAVE_KVM_DIRTY_RING_ACQ_REL 2022-09-29 10:23:08 +01:00
kvm-asm-offsets.c KVM: SVM: move MSR_IA32_SPEC_CTRL save/restore to assembly 2022-11-09 12:25:53 -05:00
kvm_cache_regs.h KVM: X86: Remove kvm_register_clear_available() 2021-12-08 04:25:03 -05:00
kvm_emulate.h KVM: x86: Bug the VM if the emulator accesses a non-existent GPR 2022-06-10 10:01:33 -04:00
kvm_onhyperv.c KVM: x86: Uninline and export hv_track_root_tdp() 2022-02-10 13:47:19 -05:00
kvm_onhyperv.h KVM: x86: Uninline and export hv_track_root_tdp() 2022-02-10 13:47:19 -05:00
lapic.c KVM: x86: fix APICv/x2AVIC disabled when vm reboot by itself 2023-01-07 11:11:47 +01:00
lapic.h KVM: x86: Rename kvm_apic_has_events() to make it INIT/SIPI specific 2022-09-26 12:37:18 -04:00
Makefile KVM: SVM: replace regs argument of __svm_vcpu_run() with vcpu_svm 2022-11-09 12:16:34 -05:00
mmu.h KVM: SVM: Disable SEV-ES support if MMIO caching is disable 2022-08-10 15:08:25 -04:00
mtrr.c KVM: x86: Add helper to consolidate "raw" reserved GPA mask calculations 2021-02-04 09:27:30 -05:00
pmu.c KVM: x86/pmu: Limit the maximum number of supported Intel GP counters 2022-11-09 12:26:53 -05:00
pmu.h KVM: x86/pmu: Disable vPMU support on hybrid CPUs (host PMUs) 2023-02-22 12:59:55 +01:00
reverse_cpuid.h KVM: SEV: Mask CPUID[0x8000001F].eax according to supported features 2021-04-26 05:27:15 -04:00
trace.h KVM: x86: Print guest pgd in kvm_nested_vmenter() 2022-09-26 12:02:33 -04:00
tss.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
x86.c KVM: x86: Fail emulation during EMULTYPE_SKIP on any exception 2023-02-25 11:25:39 +01:00
x86.h KVM: x86: Rename and expose helper to detect if INIT/SIPI are allowed 2022-09-26 12:37:18 -04:00
xen.c KVM: x86: fix deadlock for KVM_XEN_EVTCHN_RESET 2023-02-25 11:25:40 +01:00
xen.h KVM: x86: do not set st->preempted when going back to user space 2022-06-08 04:21:06 -04:00