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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
..
alpha TTY/Serial driver patches for 4.2-rc1 2015-06-26 15:53:22 -07:00
arc Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-07-04 19:36:06 -07:00
arm - hwspinlock core DT support from Suman Anna 2015-07-03 14:52:25 -07:00
arm64 Various arm64 fixes: 2015-07-03 12:28:30 -07:00
avr32 Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-07-01 15:19:35 -07:00
blackfin Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-07-04 19:36:06 -07:00
c6x Merge branch 'for-4.2/sg' of git://git.kernel.dk/linux-block 2015-06-25 15:22:36 -07:00
cris Replace module_init with equivalent device_initcall in non modules. 2015-07-02 10:30:48 -07:00
frv Fix up implicit <module.h> users that will break later. 2015-07-02 10:25:22 -07:00
h8300 h8300: Always build dtb 2015-06-23 13:36:00 +09:00
hexagon Merge branch 'for-4.2/sg' of git://git.kernel.dk/linux-block 2015-06-25 15:22:36 -07:00
ia64 remove some boot noise from a now-invalid check that pages are reserved 2015-07-02 14:46:15 -07:00
m32r Merge branch 'for-4.2/sg' of git://git.kernel.dk/linux-block 2015-06-25 15:22:36 -07:00
m68k Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-07-01 15:19:35 -07:00
metag Merge branch 'akpm' (patches from Andrew) 2015-06-26 09:52:05 -07:00
microblaze Merge branch 'for-4.2/sg' of git://git.kernel.dk/linux-block 2015-06-25 15:22:36 -07:00
mips Devicetree changes for v4.2 2015-07-01 19:40:18 -07:00
mn10300 Replace module_init with equivalent device_initcall in non modules. 2015-07-02 10:30:48 -07:00
nios2 nios2 update for v4.2 2015-07-03 12:22:49 -07:00
openrisc Merge branch 'for-4.2/sg' of git://git.kernel.dk/linux-block 2015-06-25 15:22:36 -07:00
parisc Replace module_init with equivalent device_initcall in non modules. 2015-07-02 10:30:48 -07:00
powerpc Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-07-04 19:36:06 -07:00
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-07-04 19:36:06 -07:00
score Merge branch 'for-4.2/sg' of git://git.kernel.dk/linux-block 2015-06-25 15:22:36 -07:00
sh Replace module_init with equivalent device_initcall in non modules. 2015-07-02 10:30:48 -07:00
sparc Merge branch 'akpm' (patches from Andrew) 2015-06-26 09:52:05 -07:00
tile Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-07-04 19:36:06 -07:00
um Minor merge needed, due to function move. 2015-07-01 10:49:25 -07:00
unicore32 arch/unicore32/kernel/fpu-ucf64.c: remove unnecessary KERN_ERR 2015-06-30 19:44:59 -07:00
x86 kvm: x86: fix load xsave feature warning 2015-07-10 13:26:45 +02:00
xtensa Replace module_init with equivalent device_initcall in non modules. 2015-07-02 10:30:48 -07:00
.gitignore
Kconfig clone: support passing tls argument via C rather than pt_regs magic 2015-06-25 17:00:38 -07:00