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linux/arch/x86/kvm
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Wanpeng Li ee4100da16 kvm: x86: fix load xsave feature warning 
[   68.196974] WARNING: CPU: 1 PID: 2140 at arch/x86/kvm/x86.c:3161 kvm_arch_vcpu_ioctl+0xe88/0x1340 [kvm]()
[   68.196975] Modules linked in: snd_hda_codec_hdmi i915 rfcomm bnep bluetooth i2c_algo_bit rfkill nfsd drm_kms_helper nfs_acl nfs drm lockd grace sunrpc fscache snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_pcm snd_seq_dummy snd_seq_oss x86_pkg_temp_thermal snd_seq_midi kvm_intel snd_seq_midi_event snd_rawmidi kvm snd_seq ghash_clmulni_intel fuse snd_timer aesni_intel parport_pc ablk_helper snd_seq_device cryptd ppdev snd lp parport lrw dcdbas gf128mul i2c_core glue_helper lpc_ich video shpchp mfd_core soundcore serio_raw acpi_cpufreq ext4 mbcache jbd2 sd_mod crc32c_intel ahci libahci libata e1000e ptp pps_core
[   68.197005] CPU: 1 PID: 2140 Comm: qemu-system-x86 Not tainted 4.2.0-rc1+ #2
[   68.197006] Hardware name: Dell Inc. OptiPlex 7020/0F5C5X, BIOS A03 01/08/2015
[   68.197007]  ffffffffa03b0657 ffff8800d984bca8 ffffffff815915a2 0000000000000000
[   68.197009]  0000000000000000 ffff8800d984bce8 ffffffff81057c0a 00007ff6d0001000
[   68.197010]  0000000000000002 ffff880211c1a000 0000000000000004 ffff8800ce0288c0
[   68.197012] Call Trace:
[   68.197017]  [<ffffffff815915a2>] dump_stack+0x45/0x57
[   68.197020]  [<ffffffff81057c0a>] warn_slowpath_common+0x8a/0xc0
[   68.197022]  [<ffffffff81057cfa>] warn_slowpath_null+0x1a/0x20
[   68.197029]  [<ffffffffa037bed8>] kvm_arch_vcpu_ioctl+0xe88/0x1340 [kvm]
[   68.197035]  [<ffffffffa037aede>] ? kvm_arch_vcpu_load+0x4e/0x1c0 [kvm]
[   68.197040]  [<ffffffffa03696a6>] kvm_vcpu_ioctl+0xc6/0x5c0 [kvm]
[   68.197043]  [<ffffffff811252d2>] ? perf_pmu_enable+0x22/0x30
[   68.197044]  [<ffffffff8112663e>] ? perf_event_context_sched_in+0x7e/0xb0
[   68.197048]  [<ffffffff811a6882>] do_vfs_ioctl+0x2c2/0x4a0
[   68.197050]  [<ffffffff8107bf33>] ? finish_task_switch+0x173/0x220
[   68.197053]  [<ffffffff8123307f>] ? selinux_file_ioctl+0x4f/0xd0
[   68.197055]  [<ffffffff8122cac3>] ? security_file_ioctl+0x43/0x60
[   68.197057]  [<ffffffff811a6ad9>] SyS_ioctl+0x79/0x90
[   68.197060]  [<ffffffff81597e57>] entry_SYSCALL_64_fastpath+0x12/0x6a
[   68.197061] ---[ end trace 558a5ebf9445fc80 ]---

After commit (0c4109bec0 'x86/fpu/xstate: Fix up bad get_xsave_addr()
assumptions'), there is no assumption an xsave bit is present in the
hardware (pcntxt_mask) that it is always present in a given xsave buffer.
An enabled state to be present on 'pcntxt_mask', but *not* in 'xstate_bv'
could happen when the last 'xsave' did not request that this feature be
saved (unlikely) or because the "init optimization" caused it to not be
saved. This patch kill the assumption.

Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
 		2015-07-10 13:26:45 +02:00
..
Kconfig KVM: x86: mark legacy PCI device assignment as deprecated 2015-06-05 17:26:39 +02:00
Makefile KVM: x86/vPMU: Define kvm_pmu_ops to support vPMU function dispatch 2015-06-23 14:12:14 +02:00
assigned-dev.c VFS: assorted d_backing_inode() annotations 2015-04-15 15:06:59 -04:00
assigned-dev.h KVM: x86: move device assignment out of kvm_host.h 2014-11-24 16:53:50 +01:00
cpuid.c KVM: VMX: fix vmwrite to invalid VMCS 2015-07-10 13:25:25 +02:00
cpuid.h KVM: x86: save/load state on SMM switch 2015-06-04 16:17:46 +02:00
emulate.c KVM: x86: save/load state on SMM switch 2015-06-04 16:17:46 +02:00
i8254.c KVM: x86: make vapics_in_nmi_mode atomic 2015-07-03 18:55:17 +02:00
i8254.h KVM: move iodev.h from virt/kvm/ to include/kvm 2015-03-26 21:43:12 +00:00
i8259.c KVM/ARM changes for v4.1: 2015-04-07 18:09:20 +02:00
ioapic.c KVM: x86: drop unneeded null test 2015-05-07 11:29:47 +02:00
ioapic.h KVM/ARM changes for v4.1: 2015-04-07 18:09:20 +02:00
iommu.c KVM: count number of assigned devices 2015-07-10 13:25:26 +02:00
irq.c KVM: nVMX: fix "acknowledge interrupt on exit" when APICv is in use 2014-08-05 15:00:24 +02:00
irq.h KVM: move iodev.h from virt/kvm/ to include/kvm 2015-03-26 21:43:12 +00:00
irq_comm.c kvm: x86: Deliver MSI IRQ to only lowest prio cpu if msi_redir_hint is true 2015-05-07 11:29:45 +02:00
kvm_cache_regs.h KVM: x86: API changes for SMM support 2015-06-04 16:01:11 +02:00
lapic.c KVM: x86: keep track of LVT0 changes under APICv 2015-07-03 18:55:18 +02:00
lapic.h KVM: x86: keep track of LVT0 changes under APICv 2015-07-03 18:55:18 +02:00
mmu.c KVM: x86: reintroduce kvm_is_mmio_pfn 2015-07-10 13:25:24 +02:00
mmu.h KVM: MMU: fix MTRR update 2015-05-19 20:52:42 +02:00
mmu_audit.c Minor merge needed, due to function move. 2015-07-01 10:49:25 -07:00
mmutrace.h tracing: Rename ftrace_event.h to trace_events.h 2015-05-13 14:05:12 -04:00
mtrr.c KVM: MTRR: do not map huge page for non-consistent range 2015-06-19 17:16:29 +02:00
paging_tmpl.h KVM: x86: use vcpu-specific functions to read/write/translate GFNs 2015-06-05 17:26:36 +02:00
pmu.c KVM: x86/vPMU: Define kvm_pmu_ops to support vPMU function dispatch 2015-06-23 14:12:14 +02:00
pmu.h KVM: x86/vPMU: Define kvm_pmu_ops to support vPMU function dispatch 2015-06-23 14:12:14 +02:00
pmu_amd.c KVM: x86/vPMU: Implement AMD vPMU code for KVM 2015-06-23 14:12:15 +02:00
pmu_intel.c KVM: x86/vPMU: Define kvm_pmu_ops to support vPMU function dispatch 2015-06-23 14:12:14 +02:00
svm.c KVM: x86: apply guest MTRR virtualization on host reserved pages 2015-07-10 13:25:27 +02:00
trace.h KVM: x86: save/load state on SMM switch 2015-06-04 16:17:46 +02:00
tss.h KVM: x86: hardware task switching support 2008-04-27 12:00:39 +03:00
vmx.c KVM: x86: apply guest MTRR virtualization on host reserved pages 2015-07-10 13:25:27 +02:00
x86.c kvm: x86: fix load xsave feature warning 2015-07-10 13:26:45 +02:00
x86.h KVM: MTRR: do not map huge page for non-consistent range 2015-06-19 17:16:29 +02:00