Commit Graph

648638 Commits

Author SHA1 Message Date
Borislav Petkov 5dedade6df x86/CPU: Add native CPUID variants returning a single datum
... similarly to the cpuid_<reg>() variants.

Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/20170109114147.5082-2-bp@alien8.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2017-01-09 23:11:13 +01:00
Jes Sorensen 32cd7cbbac md/raid5: Use correct IS_ERR() variation on pointer check
This fixes a build error on certain architectures, such as ppc64.

Fixes: 6995f0b247e("md: takeover should clear unrelated bits")
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Shaohua Li <shli@fb.com>
2017-01-09 13:58:10 -08:00
Christoph Hellwig 84a4620cfe xfs: don't print warnings when xfs_log_force fails
There are only two reasons for xfs_log_force / xfs_log_force_lsn to fail:
one is an I/O error, for which xlog_bdstrat already logs a warning, and
the second is an already shutdown log due to a previous I/O errors.  In
the latter case we'll already have a previous indication for the actual
error, but the large stream of misleading warnings from xfs_log_force
will probably scroll it out of the message buffer.

Simply removing the warnings thus makes the XFS log reporting significantly
better.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2017-01-09 13:45:01 -08:00
Christoph Hellwig 12ef830198 xfs: don't rely on ->total in xfs_alloc_space_available
->total is a bit of an odd parameter passed down to the low-level
allocator all the way from the high-level callers.  It's supposed to
contain the maximum number of blocks to be allocated for the whole
transaction [1].

But in xfs_iomap_write_allocate we only convert existing delayed
allocations and thus only have a minimal block reservation for the
current transaction, so xfs_alloc_space_available can't use it for
the allocation decisions.  Use the maximum of args->total and the
calculated block requirement to make a decision.  We probably should
get rid of args->total eventually and instead apply ->minleft more
broadly, but that will require some extensive changes all over.

[1] which creates lots of confusion as most callers don't decrement it
once doing a first allocation.  But that's for a separate series.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2017-01-09 13:45:01 -08:00
Christoph Hellwig 54fee133ad xfs: adjust allocation length in xfs_alloc_space_available
We must decide in xfs_alloc_fix_freelist if we can perform an
allocation from a given AG is possible or not based on the available
space, and should not fail the allocation past that point on a
healthy file system.

But currently we have two additional places that second-guess
xfs_alloc_fix_freelist: xfs_alloc_ag_vextent tries to adjust the
maxlen parameter to remove the reservation before doing the
allocation (but ignores the various minium freespace requirements),
and xfs_alloc_fix_minleft tries to fix up the allocated length
after we've found an extent, but ignores the reservations and also
doesn't take the AGFL into account (and thus fails allocations
for not matching minlen in some cases).

Remove all these later fixups and just correct the maxlen argument
inside xfs_alloc_fix_freelist once we have the AGF buffer locked.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2017-01-09 13:37:44 -08:00
Christoph Hellwig 255c516278 xfs: fix bogus minleft manipulations
We can't just set minleft to 0 when we're low on space - that's exactly
what we need minleft for: to protect space in the AG for btree block
allocations when we are low on free space.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2017-01-09 13:36:36 -08:00
Christoph Hellwig 5149fd327f xfs: bump up reserved blocks in xfs_alloc_set_aside
Setting aside 4 blocks globally for bmbt splits isn't all that useful,
as different threads can allocate space in parallel.  Bump it to 4
blocks per AG to allow each thread that is currently doing an
allocation to dip into it separately.  Without that we may no have
enough reserved blocks if there are enough parallel transactions
in an almost out space file system that all run into bmap btree
splits.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2017-01-09 13:35:00 -08:00
Eric Dumazet 6bb629db5e tcp: do not export tcp_peer_is_proven()
After commit 1fb6f159fd ("tcp: add tcp_conn_request"),
tcp_peer_is_proven() no longer needs to be exported.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-01-09 16:34:39 -05:00
Jean Delvare 2ebae8bd60 net: phy: Add Meson GXL PHY hardware dependency
As I understand it the Meson GXL PHY driver is only useful on one
architecture so only make it visible on that architecture.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Fixes: 7334b3e47a ("net: phy: Add Meson GXL Internal PHY driver")
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-01-09 16:34:39 -05:00
Vlad Tsyrklevich ce7e40c432 net/appletalk: Fix kernel memory disclosure
ipddp_route structs contain alignment padding so kernel heap memory
is leaked when they are copied to user space in
ipddp_ioctl(SIOCFINDIPDDPRT). Change kmalloc() to kzalloc() to clear
that memory.

Signed-off-by: Vlad Tsyrklevich <vlad@tsyrklevich.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-01-09 16:34:39 -05:00
Pavel Tikhomirov b007f09072 ipv4: make tcp_notsent_lowat sysctl knob behave as true unsigned int
> cat /proc/sys/net/ipv4/tcp_notsent_lowat
-1
> echo 4294967295 > /proc/sys/net/ipv4/tcp_notsent_lowat
-bash: echo: write error: Invalid argument
> echo -2147483648 > /proc/sys/net/ipv4/tcp_notsent_lowat
> cat /proc/sys/net/ipv4/tcp_notsent_lowat
-2147483648

but in documentation we have "tcp_notsent_lowat - UNSIGNED INTEGER"

v2: simplify to just proc_douintvec
Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-01-09 16:34:38 -05:00
Alexander Alemayhu 67c408cfa8 ipv6: fix typos
o s/approriate/appropriate
o s/discouvery/discovery

Signed-off-by: Alexander Alemayhu <alexander@alemayhu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-01-09 16:34:15 -05:00
Linus Torvalds bd5d7428f5 amdgpu, radeon, msm, meson, tilcdc, drm fixes.
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Merge tag 'drm-fixes-for-v4.10-rc4' of git://people.freedesktop.org/~airlied/linux

Pull drm fixes from Dave Airlie:
 "amdgpu, radeon, msm, meson, tilcdc, drm fixes.

  Just back online for a couple of days, gathered up the remaining fixes
  pull requests.

  This contains fixes for a few ARM platforms (msm, tilcdc, meson), and
  one core atomic fix. The AMD pull has some new hardware support
  (Polaris12) in it, but this is pretty limited to just hw enablement
  and shouldn't cause any problems"

* tag 'drm-fixes-for-v4.10-rc4' of git://people.freedesktop.org/~airlied/linux:
  drm/amdgpu: drop verde dpm quirks
  drm/radeon: drop verde dpm quirks
  drm/radeon: update smc firmware selection for SI
  drm/amdgpu: update si kicker smc firmware
  drm/amd/powerplay: extend smu's response timeout time.
  drm/amdgpu: remove static integer for uvd pp state
  drm/amd/amdgpu: add Polaris12 PCI ID
  drm/amdgpu/powerplay: add Polaris12 support
  drm/amd/amdgpu: add Polaris12 support (v3)
  MAINTAINERS: Update mailing list for radeon and amdgpu
  drm/meson: Fix CVBS VDAC disable
  drm/meson: Fix CVBS initialization when HDMI is configured by bootloader
  drm: Clean up planes in atomic commit helper failure path
  drm: tilcdc: simplify the recovery from sync lost error on rev1
  drm/meson: Fix plane atomic check when no crtc for the plane
  drm/msm: Verify that MSM_SUBMIT_BO_FLAGS are set
  drm/msm: Put back the vaddr in submit_reloc()
  drm/msm: Ensure that the hardware write pointer is valid
2017-01-09 12:54:20 -08:00
Linus Torvalds 756a7334f2 GPIO fixes for the v4.10 series:
- Move free:ing of GPIO hogs to after free:ing the device
   to get rid of a warning state.
 
 - A small comile warning fix.
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Merge tag 'gpio-v4.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO fixes from Linus Walleij:

 - move freeing of GPIO hogs to after freeing the device to get rid of a
   warning state.

 - a small compile warning fix

* tag 'gpio-v4.10-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
  gpio: Move freeing of GPIO hogs before numbing of the device
  gpio: mxs: remove __init annotation
2017-01-09 12:50:33 -08:00
Zefir Kurtisi 811a919135 phy state machine: failsafe leave invalid RUNNING state
While in RUNNING state, phy_state_machine() checks for link changes by
comparing phydev->link before and after calling phy_read_status().
This works as long as it is guaranteed that phydev->link is never
changed outside the phy_state_machine().

If in some setups this happens, it causes the state machine to miss
a link loss and remain RUNNING despite phydev->link being 0.

This has been observed running a dsa setup with a process continuously
polling the link states over ethtool each second (SNMPD RFC-1213
agent). Disconnecting the link on a phy followed by a ETHTOOL_GSET
causes dsa_slave_get_settings() / dsa_slave_get_link_ksettings() to
call phy_read_status() and with that modify the link status - and
with that bricking the phy state machine.

This patch adds a fail-safe check while in RUNNING, which causes to
move to CHANGELINK when the link is gone and we are still RUNNING.

Signed-off-by: Zefir Kurtisi <zefir.kurtisi@neratec.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-01-09 15:37:44 -05:00
Linus Torvalds c92f5bdc4b Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Pull networking fixes from David Miller:

 1) Fix dumping of nft_quota entries, from Pablo Neira Ayuso.

 2) Fix out of bounds access in nf_tables discovered by KASAN, from
    Florian Westphal.

 3) Fix IRQ enabling in dp83867 driver, from Grygorii Strashko.

 4) Fix unicast filtering in be2net driver, from Ivan Vecera.

 5) tg3_get_stats64() can race with driver close and ethtool
    reconfigurations, fix from Michael Chan.

 6) Fix error handling when pass limit is reached in bpf code gen on
    x86. From Daniel Borkmann.

 7) Don't clobber switch ops and use proper MDIO nested reads and writes
    in bcm_sf2 driver, from Florian Fainelli.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (21 commits)
  net: dsa: bcm_sf2: Utilize nested MDIO read/write
  net: dsa: bcm_sf2: Do not clobber b53_switch_ops
  net: stmmac: fix maxmtu assignment to be within valid range
  bpf: change back to orig prog on too many passes
  tg3: Fix race condition in tg3_get_stats64().
  be2net: fix unicast list filling
  be2net: fix accesses to unicast list
  netlabel: add CALIPSO to the list of built-in protocols
  vti6: fix device register to report IFLA_INFO_KIND
  net: phy: dp83867: fix irq generation
  amd-xgbe: Fix IRQ processing when running in single IRQ mode
  sh_eth: R8A7740 supports packet shecksumming
  sh_eth: fix EESIPR values for SH77{34|63}
  r8169: fix the typo in the comment
  nl80211: fix sched scan netlink socket owner destruction
  bridge: netfilter: Fix dropping packets that moving through bridge interface
  netfilter: ipt_CLUSTERIP: check duplicate config when initializing
  netfilter: nft_payload: mangle ckecksum if NFT_PAYLOAD_L4CSUM_PSEUDOHDR is set
  netfilter: nf_tables: fix oob access
  netfilter: nft_queue: use raw_smp_processor_id()
  ...
2017-01-09 11:58:28 -08:00
Johan Hovold 55fa15b598 USB: serial: ch341: fix baud rate and line-control handling
Revert to using direct register writes to set the divisor and
line-control registers.

A recent change switched to using the init vendor command to update
these registers, something which also enabled support for CH341A
devices. It turns out that simply setting bit 7 in the divisor register
is sufficient to support CH341A and specifically prevent data from being
buffered until a full endpoint-size packet (32 bytes) has been received.

Using the init command also had the side-effect of temporarily
deasserting the DTR/RTS signals on every termios change (including
initialisation on open) something which for example could cause problems
in setups where DTR is used to trigger a reset.

Fixes: 4e46c410e0 ("USB: serial: ch341: reinitialize chip on
reconfiguration")
Signed-off-by: Johan Hovold <johan@kernel.org>
2017-01-09 14:55:40 +01:00
Johan Hovold 3cca8624b6 USB: serial: ch341: fix line settings after reset-resume
A recent change added support for modifying the default line-control
settings, but did not make sure that the modified settings were used as
part of reconfiguration after a device has been reset during resume.

This caused a port that was open before suspend to be unusable until
being closed and reopened.

Fixes: ba781bdf86 ("USB: serial: ch341: add support for parity, frame
length, stop bits")
Signed-off-by: Johan Hovold <johan@kernel.org>
2017-01-09 14:55:39 +01:00
Johan Hovold ce5e292828 USB: serial: ch341: fix resume after reset
Fix reset-resume handling which failed to resubmit the read and
interrupt URBs, thereby leaving a port that was open before suspend in a
broken state until closed and reopened.

Fixes: 1ded7ea47b ("USB: ch341 serial: fix port number changed after
resume")
Fixes: 2bfd1c96a9 ("USB: serial: ch341: remove reset_resume callback")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
2017-01-09 14:55:38 +01:00
Johan Hovold f2950b7854 USB: serial: ch341: fix open error handling
Make sure to stop the interrupt URB before returning on errors during
open.

Fixes: 664d5df92e ("USB: usb-serial ch341: support for DTR/RTS/CTS")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
2017-01-09 14:55:38 +01:00
Johan Hovold 030ee7ae52 USB: serial: ch341: fix modem-control and B0 handling
The modem-control signals are managed by the tty-layer during open and
should not be asserted prematurely when set_termios is called from
driver open.

Also make sure that the signals are asserted only when changing speed
from B0.

Fixes: 664d5df92e ("USB: usb-serial ch341: support for DTR/RTS/CTS")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
2017-01-09 14:55:37 +01:00
Johan Hovold a20047f36e USB: serial: ch341: fix open and resume after B0
The private baud_rate variable is used to configure the port at open and
reset-resume and must never be set to (and left at) zero or reset-resume
and all further open attempts will fail.

Fixes: aa91def41a ("USB: ch341: set tty baud speed according to tty
struct")
Fixes: 664d5df92e ("USB: usb-serial ch341: support for DTR/RTS/CTS")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
2017-01-09 14:55:37 +01:00
Johan Hovold 4e2da44691 USB: serial: ch341: fix initial modem-control state
DTR and RTS will be asserted by the tty-layer when the port is opened
and deasserted on close (if HUPCL is set). Make sure the initial state
is not-asserted before the port is first opened as well.

Fixes: 664d5df92e ("USB: usb-serial ch341: support for DTR/RTS/CTS")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
2017-01-09 14:55:37 +01:00
Jim Mattson 21e7fbe7db kvm: nVMX: Reorder error checks for emulated VMXON
Checks on the operand to VMXON are performed after the check for
legacy mode operation and the #GP checks, according to the pseudo-code
in Intel's SDM.

Signed-off-by: Jim Mattson <jmattson@google.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
2017-01-09 14:48:04 +01:00
Paolo Bonzini 4d82d12b39 KVM: lapic: do not scan IRR when delivering an interrupt
On interrupt delivery the PPR can only grow (except for auto-EOI),
so it is impossible that non-auto-EOI interrupt delivery results
in KVM_REQ_EVENT.  We can therefore use __apic_update_ppr.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:48:03 +01:00
Paolo Bonzini 26fbbee581 KVM: lapic: do not set KVM_REQ_EVENT unnecessarily on PPR update
On PPR update, we set KVM_REQ_EVENT unconditionally anytime PPR is lowered.
But we can take into account IRR here already.

Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:48:02 +01:00
Paolo Bonzini b3c045d332 KVM: lapic: remove unnecessary KVM_REQ_EVENT on PPR update
PPR needs to be updated whenever on every IRR read because we
may have missed TPR writes that _increased_ PPR.  However, these
writes need not generate KVM_REQ_EVENT, because either KVM_REQ_EVENT
has been set already in __apic_accept_irq, or we are going to
process the interrupt right away.

Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:48:01 +01:00
Paolo Bonzini eb90f3417a KVM: vmx: speed up TPR below threshold vmexits
Since we're already in VCPU context, all we have to do here is recompute
the PPR value.  That will in turn generate a KVM_REQ_EVENT if necessary.

Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:48:00 +01:00
Paolo Bonzini 0f1e261ead KVM: x86: add VCPU stat for KVM_REQ_EVENT processing
This statistic can be useful to estimate the cost of an IRQ injection
scenario, by comparing it with irq_injections.  For example the stat
shows that sti;hlt triggers more KVM_REQ_EVENT than sti;nop.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:47:59 +01:00
Tom Lendacky 0f89b207b0 kvm: svm: Use the hardware provided GPA instead of page walk
When a guest causes a NPF which requires emulation, KVM sometimes walks
the guest page tables to translate the GVA to a GPA. This is unnecessary
most of the time on AMD hardware since the hardware provides the GPA in
EXITINFO2.

The only exception cases involve string operations involving rep or
operations that use two memory locations. With rep, the GPA will only be
the value of the initial NPF and with dual memory locations we won't know
which memory address was translated into EXITINFO2.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Reviewed-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:47:58 +01:00
Radim Krčmář 5bd5db385b KVM: x86: allow hotplug of VCPU with APIC ID over 0xff
LAPIC after reset is in xAPIC mode, which poses a problem for hotplug of
VCPUs with high APIC ID, because reset VCPU is waiting for INIT/SIPI,
but there is no way to uniquely address it using xAPIC.

From many possible options, we chose the one that also works on real
hardware: accepting interrupts addressed to LAPIC's x2APIC ID even in
xAPIC mode.

KVM intentionally differs from real hardware, because real hardware
(Knights Landing) does just "x2apic_id & 0xff" to decide whether to
accept the interrupt in xAPIC mode and it can deliver one interrupt to
more than one physical destination, e.g. 0x123 to 0x123 and 0x23.

Fixes: 682f732ecf ("KVM: x86: bump MAX_VCPUS to 288")
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:47:48 +01:00
Radim Krčmář b4535b58ae KVM: x86: make interrupt delivery fast and slow path behave the same
Slow path tried to prevent IPIs from x2APIC VCPUs from being delivered
to xAPIC VCPUs and vice-versa.  Make slow path behave like fast path,
which never distinguished that.

Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:47:40 +01:00
Radim Krčmář 6e50043912 KVM: x86: replace kvm_apic_id with kvm_{x,x2}apic_id
There were three calls sites:
 - recalculate_apic_map and kvm_apic_match_physical_addr, where it would
   only complicate implementation of x2APIC hotplug;
 - in apic_debug, where it was still somewhat preserved, but keeping the
   old function just for apic_debug was not worth it

Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:47:29 +01:00
Radim Krčmář f98a3efb28 KVM: x86: use delivery to self in hyperv synic
Interrupt to self can be sent without knowing the APIC ID.

Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:46:13 +01:00
Junaid Shahid 63dbe14d39 kvm: x86: mmu: Update documentation for fast page fault mechanism
Add a brief description of the lockless access tracking mechanism
to the documentation of fast page faults in locking.txt.

Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:46:12 +01:00
Junaid Shahid f160c7b7bb kvm: x86: mmu: Lockless access tracking for Intel CPUs without EPT A bits.
This change implements lockless access tracking for Intel CPUs without EPT
A bits. This is achieved by marking the PTEs as not-present (but not
completely clearing them) when clear_flush_young() is called after marking
the pages as accessed. When an EPT Violation is generated as a result of
the VM accessing those pages, the PTEs are restored to their original values.

Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:46:11 +01:00
Junaid Shahid 37f0e8fe6b kvm: x86: mmu: Do not use bit 63 for tracking special SPTEs
MMIO SPTEs currently set both bits 62 and 63 to distinguish them as special
PTEs. However, bit 63 is used as the SVE bit in Intel EPT PTEs. The SVE bit
is ignored for misconfigured PTEs but not necessarily for not-Present PTEs.
Since MMIO SPTEs use an EPT misconfiguration, so using bit 63 for them is
acceptable. However, the upcoming fast access tracking feature adds another
type of special tracking PTE, which uses not-Present PTEs and hence should
not set bit 63.

In order to use common bits to distinguish both type of special PTEs, we
now use only bit 62 as the special bit.

Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:46:10 +01:00
Junaid Shahid f39a058d0e kvm: x86: mmu: Introduce a no-tracking version of mmu_spte_update
mmu_spte_update() tracks changes in the accessed/dirty state of
the SPTE being updated and calls kvm_set_pfn_accessed/dirty
appropriately. However, in some cases (e.g. when aging the SPTE),
this shouldn't be done. mmu_spte_update_no_track() is introduced
for use in such cases.

Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:46:09 +01:00
Junaid Shahid 83ef6c8155 kvm: x86: mmu: Refactor accessed/dirty checks in mmu_spte_update/clear
This simplifies mmu_spte_update() a little bit.
The checks for clearing of accessed and dirty bits are refactored into
separate functions, which are used inside both mmu_spte_update() and
mmu_spte_clear_track_bits(), as well as kvm_test_age_rmapp(). The new
helper functions handle both the case when A/D bits are supported in
hardware and the case when they are not.

Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:46:08 +01:00
Junaid Shahid 97dceba29a kvm: x86: mmu: Fast Page Fault path retries
This change adds retries into the Fast Page Fault path. Without the
retries, the code still works, but if a retry does end up being needed,
then it will result in a second page fault for the same memory access,
which will cause much more overhead compared to just retrying within the
original fault.

This would be especially useful with the upcoming fast access tracking
change, as that would make it more likely for retries to be needed
(e.g. due to read and write faults happening on different CPUs at
the same time).

Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:46:07 +01:00
Junaid Shahid ea4114bcd3 kvm: x86: mmu: Rename spte_is_locklessly_modifiable()
This change renames spte_is_locklessly_modifiable() to
spte_can_locklessly_be_made_writable() to distinguish it from other
forms of lockless modifications. The full set of lockless modifications
is covered by spte_has_volatile_bits().

Signed-off-by: Junaid Shahid <junaids@google.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:46:06 +01:00
Junaid Shahid 27959a4415 kvm: x86: mmu: Use symbolic constants for EPT Violation Exit Qualifications
This change adds some symbolic constants for VM Exit Qualifications
related to EPT Violations and updates handle_ept_violation() to use
these constants instead of hard-coded numbers.

Signed-off-by: Junaid Shahid <junaids@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:46:05 +01:00
David Matlack 114df303a7 kvm: x86: reduce collisions in mmu_page_hash
When using two-dimensional paging, the mmu_page_hash (which provides
lookups for existing kvm_mmu_page structs), becomes imbalanced; with
too many collisions in buckets 0 and 512. This has been seen to cause
mmu_lock to be held for multiple milliseconds in kvm_mmu_get_page on
VMs with a large amount of RAM mapped with 4K pages.

The current hash function uses the lower 10 bits of gfn to index into
mmu_page_hash. When doing shadow paging, gfn is the address of the
guest page table being shadow. These tables are 4K-aligned, which
makes the low bits of gfn a good hash. However, with two-dimensional
paging, no guest page tables are being shadowed, so gfn is the base
address that is mapped by the table. Thus page tables (level=1) have
a 2MB aligned gfn, page directories (level=2) have a 1GB aligned gfn,
etc. This means hashes will only differ in their 10th bit.

hash_64() provides a better hash. For example, on a VM with ~200G
(99458 direct=1 kvm_mmu_page structs):

hash            max_mmu_page_hash_collisions
--------------------------------------------
low 10 bits     49847
hash_64         105
perfect         97

While we're changing the hash, increase the table size by 4x to better
support large VMs (further reduces number of collisions in 200G VM to
29).

Note that hash_64() does not provide a good distribution prior to commit
ef703f49a6 ("Eliminate bad hash multipliers from hash_32() and
hash_64()").

Signed-off-by: David Matlack <dmatlack@google.com>
Change-Id: I5aa6b13c834722813c6cca46b8b1ed6f53368ade
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:46:04 +01:00
David Matlack f3414bc774 kvm: x86: export maximum number of mmu_page_hash collisions
Report the maximum number of mmu_page_hash collisions as a per-VM stat.
This will make it easy to identify problems with the mmu_page_hash in
the future.

Signed-off-by: David Matlack <dmatlack@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:46:03 +01:00
Radim Krčmář 826da32140 KVM: x86: simplify conditions with split/kernel irqchip
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:45:57 +01:00
Radim Krčmář 8231f50d98 KVM: x86: prevent setup of invalid routes
The check in kvm_set_pic_irq() and kvm_set_ioapic_irq() was just a
temporary measure until the code improved enough for us to do this.

This changes APIC in a case when KVM_SET_GSI_ROUTING is called to set up pic
and ioapic routes before KVM_CREATE_IRQCHIP.  Those rules would get overwritten
by KVM_CREATE_IRQCHIP at best, so it is pointless to allow it.  Userspaces
hopefully noticed that things don't work if they do that and don't do that.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:45:50 +01:00
Radim Krčmář e5dc48777d KVM: x86: refactor pic setup in kvm_set_routing_entry
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:45:36 +01:00
Radim Krčmář 099413664c KVM: x86: make pic setup code look like ioapic setup
We don't treat kvm->arch.vpic specially anymore, so the setup can look
like ioapic.  This gets a bit more information out of return values.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:45:28 +01:00
Radim Krčmář 49776faf93 KVM: x86: decouple irqchip_in_kernel() and pic_irqchip()
irqchip_in_kernel() tried to save a bit by reusing pic_irqchip(), but it
just complicated the code.
Add a separate state for the irqchip mode.

Reviewed-by: David Hildenbrand <david@redhat.com>
[Used Paolo's version of condition in irqchip_in_kernel().]
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
2017-01-09 14:42:47 +01:00
Radim Krčmář 35e6eaa3df KVM: x86: don't allow kernel irqchip with split irqchip
Split irqchip cannot be created after creating the kernel irqchip, but
we forgot to restrict the other way.  This is an API change.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2017-01-09 14:38:19 +01:00