AuxXxilium/linux_dsm_epyc7002
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9a6e7c3981
linux_dsm_epyc7002/arch/x86/kvm
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Wanpeng Li 9a6e7c3981 KVM: async_pf: Fix #DF due to inject "Page not Present" and "Page Ready" exceptions simultaneously 
qemu-system-x86-8600  [004] d..1  7205.687530: kvm_entry: vcpu 2
qemu-system-x86-8600  [004] ....  7205.687532: kvm_exit: reason EXCEPTION_NMI rip 0xffffffffa921297d info ffffeb2c0e44e018 80000b0e
qemu-system-x86-8600  [004] ....  7205.687532: kvm_page_fault: address ffffeb2c0e44e018 error_code 0
qemu-system-x86-8600  [004] ....  7205.687620: kvm_try_async_get_page: gva = 0xffffeb2c0e44e018, gfn = 0x427e4e
qemu-system-x86-8600  [004] .N..  7205.687628: kvm_async_pf_not_present: token 0x8b002 gva 0xffffeb2c0e44e018
    kworker/4:2-7814  [004] ....  7205.687655: kvm_async_pf_completed: gva 0xffffeb2c0e44e018 address 0x7fcc30c4e000
qemu-system-x86-8600  [004] ....  7205.687703: kvm_async_pf_ready: token 0x8b002 gva 0xffffeb2c0e44e018
qemu-system-x86-8600  [004] d..1  7205.687711: kvm_entry: vcpu 2

After running some memory intensive workload in guest, I catch the kworker
which completes the GUP too quickly, and queues an "Page Ready" #PF exception
after the "Page not Present" exception before the next vmentry as the above
trace which will result in #DF injected to guest.

This patch fixes it by clearing the queue for "Page not Present" if "Page Ready"
occurs before the next vmentry since the GUP has already got the required page
and shadow page table has already been fixed by "Page Ready" handler.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Fixes: 7c90705bf2 ("KVM: Inject asynchronous page fault into a PV guest if page is swapped out.")
[Changed indentation and added clearing of injected. - Radim]
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
2017-09-14 18:43:43 +02:00
..
cpuid.c Merge branch 'kvm-ppc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2017-09-08 14:40:43 +02:00
cpuid.h KVM: x86: fix clang build 2017-09-13 16:40:24 +02:00
debugfs.c kvm: x86: export TSC information to user-space 2016-09-16 16:57:48 +02:00
emulate.c KVM: MMU: Expose the LA57 feature to VM. 2017-08-24 18:09:17 +02:00
hyperv.c KVM: X86: implement the logic for spinlock optimization 2017-08-08 10:57:43 +02:00
hyperv.h kvm: x86: hyperv: make VP_INDEX managed by userspace 2017-07-14 16:28:18 +02:00
i8254.c KVM: x86: take slots_lock in kvm_free_pit 2017-07-12 22:38:26 +02:00
i8254.h KVM: x86: Handle the kthread worker using the new API 2016-12-08 15:31:11 +01:00
i8259.c KVM: x86: simplify pic_ioport_read() 2017-04-12 20:17:15 +02:00
ioapic.c KVM: x86: rename kvm_vcpu_request_scan_ioapic() 2017-04-12 20:17:14 +02:00
ioapic.h KVM: x86: convert kvm_(set|get)_ioapic() into void 2017-04-12 20:17:14 +02:00
irq_comm.c KVM: x86: don't hold kvm->lock in KVM_SET_GSI_ROUTING 2017-05-02 14:45:45 +02:00
irq.c KVM: x86: get rid of pic_irqchip() 2017-04-12 20:17:13 +02:00
irq.h KVM: x86: don't hold kvm->lock in KVM_SET_GSI_ROUTING 2017-05-02 14:45:45 +02:00
Kconfig x86/lguest: Remove lguest support 2017-08-24 09:57:28 +02:00
kvm_cache_regs.h Merge branch 'kvm-ppc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2017-09-08 14:40:43 +02:00
lapic.c KVM: hyperv: support HV_X64_MSR_TSC_FREQUENCY and HV_X64_MSR_APIC_FREQUENCY 2017-08-07 15:26:06 +02:00
lapic.h KVM: hyperv: support HV_X64_MSR_TSC_FREQUENCY and HV_X64_MSR_APIC_FREQUENCY 2017-08-07 15:26:06 +02:00
Makefile KVM: x86: drop legacy device assignment 2017-04-07 16:49:00 +02:00
mmu_audit.c KVM: MMU: Add 5 level EPT & Shadow page table support. 2017-08-24 18:09:17 +02:00
mmu.c First batch of KVM changes for 4.14 2017-09-08 15:18:36 -07:00
mmu.h Merge branch 'kvm-ppc-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2017-09-08 14:40:43 +02:00
mmutrace.h kvm: x86: mmu: allow A/D bits to be disabled in an mmu 2017-07-03 11:19:54 +02:00
mtrr.c KVM: x86: generalize guest_cpuid_has_ helpers 2017-08-07 16:11:50 +02:00
page_track.c mm: introduce kv[mz]alloc helpers 2017-05-08 17:15:12 -07:00
paging_tmpl.h KVM: x86: fix use of L1 MMIO areas in nested guests 2017-08-18 14:37:49 +02:00
pmu_amd.c perf/x86/amd: Make HW_CACHE_REFERENCES and HW_CACHE_MISSES measure L2 2016-09-16 16:19:49 +02:00
pmu_intel.c KVM: x86/vPMU: fix undefined shift in intel_pmu_refresh() 2017-05-19 19:59:27 +02:00
pmu.c KVM: x86: never specify a sample period for virtualized in_tx_cp counters 2017-03-01 14:19:46 +01:00
pmu.h KVM: x86/vPMU: Define kvm_pmu_ops to support vPMU function dispatch 2015-06-23 14:12:14 +02:00
svm.c KVM: SVM: Add irqchip_split() checks before enabling AVIC 2017-09-14 17:05:13 +02:00
trace.h KVM: x86: Add return value to kvm_cpuid(). 2017-08-24 18:09:15 +02:00
tss.h KVM: x86: hardware task switching support 2008-04-27 12:00:39 +03:00
vmx.c KVM: Add struct kvm_vcpu pointer parameter to get_enable_apicv() 2017-09-13 18:29:06 +02:00
x86.c KVM: async_pf: Fix #DF due to inject "Page not Present" and "Page Ready" exceptions simultaneously 2017-09-14 18:43:43 +02:00
x86.h KVM: X86: Fix loss of exception which has not yet been injected 2017-08-24 18:09:19 +02:00