Wanpeng Li 17e433b543 KVM: Fix leak vCPU's VMCS value into other pCPU ... After commit d73eb57b80 (KVM: Boost vCPUs that are delivering interrupts), a five years old bug is exposed. Running ebizzy benchmark in three 80 vCPUs VMs on one 80 pCPUs Skylake server, a lot of rcu_sched stall warning splatting in the VMs after stress testing: INFO: rcu_sched detected stalls on CPUs/tasks: { 4 41 57 62 77} (detected by 15, t=60004 jiffies, g=899, c=898, q=15073) Call Trace: flush_tlb_mm_range+0x68/0x140 tlb_flush_mmu.part.75+0x37/0xe0 tlb_finish_mmu+0x55/0x60 zap_page_range+0x142/0x190 SyS_madvise+0x3cd/0x9c0 system_call_fastpath+0x1c/0x21 swait_active() sustains to be true before finish_swait() is called in kvm_vcpu_block(), voluntarily preempted vCPUs are taken into account by kvm_vcpu_on_spin() loop greatly increases the probability condition kvm_arch_vcpu_runnable(vcpu) is checked and can be true, when APICv is enabled the yield-candidate vCPU's VMCS RVI field leaks(by vmx_sync_pir_to_irr()) into spinning-on-a-taken-lock vCPU's current VMCS. This patch fixes it by checking conservatively a subset of events. Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Cc: Marc Zyngier <Marc.Zyngier@arm.com> Cc: stable@vger.kernel.org Fixes: 98f4a1467 (KVM: add kvm_arch_vcpu_runnable() test to kvm_vcpu_on_spin() loop) Signed-off-by: Wanpeng Li <wanpengli@tencent.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>		2019-08-05 12:55:47 +02:00
..
acpi	It's been a relatively busy cycle for docs:	2019-07-09 12:34:26 -07:00
asm-generic	asm-generic: remove ptrace.h	2019-07-12 15:41:33 -07:00
clocksource
crypto	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2019-07-08 20:57:08 -07:00
drm
dt-bindings	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2019-07-11 10:55:49 -07:00
keys	request_key improvements	2019-07-08 19:19:37 -07:00
kvm	KVM: arm/arm64: Support chained PMU counters	2019-07-05 13:56:22 +01:00
linux	KVM: Fix leak vCPU's VMCS value into other pCPU	2019-08-05 12:55:47 +02:00
math-emu
media	media updates for v5.3-rc1	2019-07-09 09:47:22 -07:00
memory
misc
net	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2019-07-11 10:55:49 -07:00
pcmcia	It's been a relatively busy cycle for docs:	2019-07-09 12:34:26 -07:00
ras
rdma
scsi	SCSI misc on 20190709	2019-07-11 15:14:01 -07:00
soc
sound	ASoC: Updates for v5.3	2019-07-08 14:45:34 +02:00
target
trace	f2fs-for-5.3-rc1	2019-07-12 17:28:24 -07:00
uapi	Documentation: move Documentation/virtual to Documentation/virt	2019-07-24 10:52:11 +02:00
vdso
video	fbdev changes for v5.3:	2019-07-09 09:55:45 -07:00
xen
Kbuild	kbuild: compile-test kernel headers to ensure they are self-contained	2019-07-09 21:44:37 +09:00