Commit Graph

915 Commits

Author SHA1 Message Date
Richard Henderson 258dfaaad0 exec: Avoid direct references to Int128 parts
Reviewed-by: Emilio G. Cota <cota@braap.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
2016-10-26 08:29:00 -07:00
Peter Maydell c43e853afe x86 and CPU queue, 2016-10-24
x2APIC support to APIC code, cpu_exec_init() refactor on all
 architectures, and other x86 changes.
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Merge remote-tracking branch 'remotes/ehabkost/tags/x86-pull-request' into staging

x86 and CPU queue, 2016-10-24

x2APIC support to APIC code, cpu_exec_init() refactor on all
architectures, and other x86 changes.

# gpg: Signature made Mon 24 Oct 2016 20:51:14 BST
# gpg:                using RSA key 0x2807936F984DC5A6
# gpg: Good signature from "Eduardo Habkost <ehabkost@redhat.com>"
# Primary key fingerprint: 5A32 2FD5 ABC4 D3DB ACCF  D1AA 2807 936F 984D C5A6

* remotes/ehabkost/tags/x86-pull-request:
  exec: call cpu_exec_exit() from a CPU unrealize common function
  exec: move cpu_exec_init() calls to realize functions
  exec: split cpu_exec_init()
  pc: q35: Bump max_cpus to 288
  pc: Require IRQ remapping and EIM if there could be x2APIC CPUs
  pc: Add 'etc/boot-cpus' fw_cfg file for machine with more than 255 CPUs
  Increase MAX_CPUMASK_BITS from 255 to 288
  pc: Clarify FW_CFG_MAX_CPUS usage comment
  pc: kvm_apic: Pass APIC ID depending on xAPIC/x2APIC mode
  pc: apic_common: Reset APIC ID to initial ID when switching into x2APIC mode
  pc: apic_common: Restore APIC ID to initial ID on reset
  pc: apic_common: Extend APIC ID property to 32bit
  pc: Leave max apic_id_limit only in legacy cpu hotplug code
  acpi: cphp: Force switch to modern cpu hotplug if APIC ID > 254
  pc: acpi: x2APIC support for SRAT table
  pc: acpi: x2APIC support for MADT table and _MAT method

Conflicts:
	target-arm/cpu.c

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2016-10-25 10:25:27 +01:00
Laurent Vivier 7bbc124e7e exec: call cpu_exec_exit() from a CPU unrealize common function
As cpu_exec_exit() mirrors the cpu_exec_realizefn(),
rename it as cpu_exec_unrealizefn().

Create and register a cpu_common_unrealizefn() function for
the CPU device class and call cpu_exec_unrealizefn() from
this function.

Remove cpu_exec_exit() from cpu_common_finalize()
(which mirrors init, not realize), and as x86_cpu_unrealizefn()
and ppc_cpu_unrealizefn() overwrite the device class unrealize function,
add a call to a parent_unrealize pointer.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2016-10-24 17:29:16 -02:00
Laurent Vivier ce5b1bbf62 exec: move cpu_exec_init() calls to realize functions
Modify all CPUs to call it from XXX_cpu_realizefn() function.

Remove all the cannot_destroy_with_object_finalize_yet as
unsafe references have been moved to cpu_exec_realizefn().
(tested with QOM command provided by commit 4c315c27)

for arm:

Setting of cpu->mp_affinity is moved from arm_cpu_initfn()
to arm_cpu_realizefn() as setting of cpu_index is now done
in cpu_exec_realizefn(). To avoid to overwrite an user defined
value, we set it to an invalid value by default, and update
it in realize function only if the value is still invalid.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2016-10-24 17:29:16 -02:00
Laurent Vivier 39e329e341 exec: split cpu_exec_init()
Put in cpu_exec_initfn() what initializes the CPU,
and leave in cpu_exec_init() what adds it to the environment.

As cpu_exec_initfn() is called by all XX_cpu_initfn(), call it
directly in cpu_common_initfn().
cpu_exec_init() is now a realize function, it will be renamed
to cpu_exec_realizefn() and moved to the XX_cpu_realizefn()
function in a following patch.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2016-10-24 17:29:16 -02:00
Peter Maydell 20bccb82ff cpu: Support a target CPU having a variable page size
Support target CPUs having a page size which isn't knownn
at compile time. To use this, the CPU implementation should:
 * define TARGET_PAGE_BITS_VARY
 * not define TARGET_PAGE_BITS
 * define TARGET_PAGE_BITS_MIN to the smallest value it
   might possibly want for TARGET_PAGE_BITS
 * call set_preferred_target_page_bits() in its realize
   function to indicate the actual preferred target page
   size for the CPU (and report any error from it)

In CONFIG_USER_ONLY, the CPU implementation should continue
to define TARGET_PAGE_BITS appropriately for the guest
OS page size.

Machines which want to take advantage of having the page
size something larger than TARGET_PAGE_BITS_MIN must
set the MachineClass minimum_page_bits field to a value
which they guarantee will be no greater than the preferred
page size for any CPU they create.

Note that changing the target page size by setting
minimum_page_bits is a migration compatibility break
for that machine.

For debugging purposes, attempts to use TARGET_PAGE_SIZE
before it has been finally confirmed will assert.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
2016-10-24 16:26:49 +01:00
Vijaya Kumar K 2615fabd42 exec.c: Remove static allocation of sub_section of sub_page
Allocate sub_section dynamically. Remove dependency
on TARGET_PAGE_SIZE to make run-time page size detection
for arm platforms.

Signed-off-by: Vijaya Kumar K <vijayak@cavium.com>
Message-id: 1465808915-4887-3-git-send-email-vijayak@caviumnetworks.com
[PMM: use flexible array member rather than separate malloc
 so we don't need an extra pointer deref when using it]
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2016-10-24 16:26:49 +01:00
Haozhong Zhang 8360668e69 exec.c: workaround regression caused by alignment change in d2f39ad
Commit d2f39ad "exec.c: Ensure right alignment also for file backed ram"
added an additional alignment requirement on the size of backend file
besides the previous page size. On x86, the alignment is changed from
4KB in QEMU 2.6 to 2MB in QEMU 2.7.

This change breaks certain usages in QEMU 2.7 on x86, e.g.
    -object memory-backend-file,id=mem1,mem-path=/tmp/,size=$SZ
    -device pc-dimm,id=dimm1,memdev=mem1
where $SZ is multiple of 4KB but not 2MB (e.g. 1023M). QEMU 2.7
reports the following error message and aborts:
qemu-system-x86_64: -device pc-dimm,memdev=mem1,id=nv1: backend memory size must be multiple of 0x200000

The same regression may also happen in other platforms as indicated by
Igor Mammedov. This change is however necessary for s390 according to
the commit message of d2f39ad, so we workaround the regression by taking
the change only on s390.

Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
Reported-by: "Xu, Anthony" <anthony.xu@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-10-24 15:46:11 +02:00
Dr. David Alan Gilbert 863e9621c5 RAMBlocks: Store page size
Store the page size in each RAMBlock, we need it later.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
2016-10-13 17:23:53 +02:00
Marc-André Lureau efee678d6d exec: remove unused compacted argument
Since commit b35ba30f8f when it was introduced, phys_page_compact()
takes an unused compacted argument.

ubsan complains about it when launching qemu-x86_64 without arguments:
qemu/exec.c:310:5: runtime error: variable length array bound evaluates to non-positive value 0

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2016-10-08 11:25:29 +03:00
Paolo Bonzini 267f685b8b cpus-common: move CPU list management to common code
Add a mutex for the CPU list to system emulation, as it will be used to
manage safe work.  Abstract manipulation of the CPU list in new functions
cpu_list_add and cpu_list_remove.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-09-27 11:57:29 +02:00
Cao jin c2cd627ddb kvm-all: drop kvm_setup_guest_memory
kvm_setup_guest_memory only does "madvise to QEMU_MADV_DONTFORK" and
is only called by ram_block_add, which actually is duplicate code.
Bonus: add simple comment for kvm_has_sync_mmu to make life easier.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Cao jin <caoj.fnst@cn.fujitsu.com>
Message-Id: <1473662096-32598-1-git-send-email-caoj.fnst@cn.fujitsu.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-09-13 19:09:43 +02:00
Igor Mammedov 3b8c1761f0 qtail: clean up direct access to tqe_prev field
instead of accessing tqe_prev field dircetly outside
of queue.h use macros to check if element is in list
and make sure that afer element is removed from list
tqe_prev field could be used to do the same check.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <1469450832-84343-1-git-send-email-imammedo@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-09-13 19:08:41 +02:00
Igor Mammedov 630eb0faf4 exec: Ensure the only one cpu_index allocation method is used
Make sure that cpu_index auto allocation isn't used in
combination with manual cpu_index assignment. And
dissallow out of order cpu removal if auto allocation
is in use.

Target that wishes to support out of order unplug should
switch to manual cpu_index assignment. Following patch
could be used as an example:
 (pc: init CPUState->cpu_index with index in possible_cpus[]))

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2016-09-05 16:01:55 -03:00
Igor Mammedov 056b68af77 fix qemu exit on memory hotplug when allocation fails at prealloc time
When adding hostmem backend at runtime, QEMU might exit with error:
  "os_mem_prealloc: Insufficient free host memory pages available to allocate guest RAM"

It happens due to os_mem_prealloc() not handling errors gracefully.

Fix it by passing errp argument so that os_mem_prealloc() could
report error to callers and undo performed allocation when
os_mem_prealloc() fails.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <1469008443-72059-1-git-send-email-imammedo@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-08-02 12:03:58 +02:00
Igor Mammedov a07f953ef4 exec: Set cpu_index only if it's not been explictly set
It keeps the legacy behavior for all users that doesn't care
about stable cpu_index value, but would allow boards that
would support device_add/device_del to set stable cpu_index
that won't depend on order in which cpus are created/destroyed.

While at that simplify cpu_get_free_index() as cpu_index
generated by USER_ONLY and softmmu variants is the same
since none of the users support cpu-remove so far, except
of not yet released spapr/x86 device_add/delr, which
will be altered by follow up patches to set stable
cpu_index manually.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2016-07-26 15:32:01 -03:00
Igor Mammedov 8b1b835035 exec: Don't use cpu_index to detect if cpu_exec_init()'s been called
Instead use QTAIL's tqe_prev field to detect if cpu's been
placed in list by cpu_exec_init() which is always set if
QTAIL element is in list.

Fixes SIGSEGV on failure path in case cpu_index is assigned
by board and cpu.relalize() fails before cpu_exec_init() is called.

In follow up patches, cpu_index will be assigned by boards that
support cpu hot(un)plug and need stable cpu_index that doesn't
depend on order cpus are created/removed.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reported-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2016-07-26 15:32:00 -03:00
Igor Mammedov 1bc7e522d9 exec: Reduce CONFIG_USER_ONLY ifdeffenery
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
2016-07-26 15:31:58 -03:00
Peter Lieven 101420b886 exec: avoid realloc in phys_map_node_reserve
this is the first step in reducing the brk heap fragmentation
created by the map->nodes memory allocation. Since the introduction
of RCU the freeing of the PhysPageMaps is delayed so that sometimes
several hundred are allocated at the same time.

Even worse the memory for map->nodes is allocated and shortly
afterwards reallocated. Since the number of nodes it grows
to in the end is the same for all PhysPageMaps remember this value
and at least avoid the reallocation.

The large number of simultaneous allocations (about 450 x 70kB in
my configuration) has to be addressed later.

Signed-off-by: Peter Lieven <pl@kamp.de>
Message-Id: <1468577030-21097-1-git-send-email-pl@kamp.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-07-17 09:59:21 +02:00
Markus Armbruster a9c94277f0 Use #include "..." for our own headers, <...> for others
Tracked down with an ugly, brittle and probably buggy Perl script.

Also move includes converted to <...> up so they get included before
ours where that's obviously okay.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Tested-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
2016-07-12 16:19:16 +02:00
Paolo Bonzini 02d0e09503 os-posix: include sys/mman.h
qemu/osdep.h checks whether MAP_ANONYMOUS is defined, but this check
is bogus without a previous inclusion of sys/mman.h.  Include it in
sysemu/os-posix.h and remove it from everywhere else.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-06-16 18:39:03 +02:00
Anthony PERARD d6b6aec409 exec: Fix qemu_ram_block_from_host for Xen
Since f615f39 (exec: remove ram_addr argument from
qemu_ram_block_from_host), migration under Xen is likely to fail, with a
SEGV of QEMU. But the commit only reveal a bug with the calculation of
the offset value in qemu_ram_block_from_host().

This patch calculates the offset from the ram_addr as
qemu_ram_addr_from_host() will later calculate the ram_addr from the
offset.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
2016-06-13 11:50:20 +01:00
Peter Maydell 6886b98036 cpu-exec: Rename cpu_resume_from_signal() to cpu_loop_exit_noexc()
The function cpu_resume_from_signal() is now always called with a
NULL puc argument, and is rather misnamed since it is never called
from a signal handler. It is essentially forcing an exit to the
top level cpu loop but without raising any exception, so rename
it to cpu_loop_exit_noexc() and drop the useless unused argument.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Sergey Fedorov <sergey.fedorov@linaro.org>
Acked-by: Eduardo Habkost <ehabkost@redhat.com>
Acked-by: Riku Voipio <riku.voipio@linaro.org>
Message-id: 1463494687-25947-4-git-send-email-peter.maydell@linaro.org
2016-06-09 15:55:02 +01:00
Peter Maydell 500acc9c41 ppc patch queue for 2016-05-31
Here's another ppc patch queue.  This batch is all preliminaries
 towards two significant features:
 
 1) Full hypervisor-mode support for POWER8
     Patches 1-8 start fixing various bugs with TCG's handling of
     hypervisor mode
 
 2) CPU hotplug support
     Patches 9-12 make some preliminary fixes towards implementing CPU
     hotplug on ppc64 (and other non-x86 platforms).  These patches are
     actually to generic code, not ppc, but are included here with
     Paolo's ACK.
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Merge remote-tracking branch 'remotes/dgibson/tags/ppc-for-2.7-20160531' into staging

ppc patch queue for 2016-05-31

Here's another ppc patch queue.  This batch is all preliminaries
towards two significant features:

1) Full hypervisor-mode support for POWER8
    Patches 1-8 start fixing various bugs with TCG's handling of
    hypervisor mode

2) CPU hotplug support
    Patches 9-12 make some preliminary fixes towards implementing CPU
    hotplug on ppc64 (and other non-x86 platforms).  These patches are
    actually to generic code, not ppc, but are included here with
    Paolo's ACK.

# gpg: Signature made Tue 31 May 2016 01:39:44 BST using RSA key ID 20D9B392
# gpg: Good signature from "David Gibson <david@gibson.dropbear.id.au>"
# gpg:                 aka "David Gibson (Red Hat) <dgibson@redhat.com>"
# gpg:                 aka "David Gibson (ozlabs.org) <dgibson@ozlabs.org>"
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: 75F4 6586 AE61 A66C C44E  87DC 6C38 CACA 20D9 B392

* remotes/dgibson/tags/ppc-for-2.7-20160531:
  cpu: Add a sync version of cpu_remove()
  cpu: Reclaim vCPU objects
  exec: Do vmstate unregistration from cpu_exec_exit()
  exec: Remove cpu from cpus list during cpu_exec_exit()
  ppc: Add PPC_64H instruction flag to POWER7 and POWER8
  ppc: Get out of emulation on SMT "OR" ops
  ppc: Fix sign extension issue in mtmsr(d) emulation
  ppc: Change 'invalid' bit mask of tlbiel and tlbie
  ppc: tlbie, tlbia and tlbisync are HV only
  ppc: Do some batching of TCG tlb flushes
  ppc: Use split I/D mmu modes to avoid flushes on interrupts
  ppc: Remove MMU_MODEn_SUFFIX definitions

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2016-05-31 10:37:22 +01:00
Bharata B Rao 9dfeca7c6b exec: Do vmstate unregistration from cpu_exec_exit()
cpu_exec_init() does vmstate_register for the CPU device. This needs to be
undone from cpu_exec_exit(). This change is needed to support CPU hot
removal.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
[dwg: added missing include to fix compile on some archs]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2016-05-30 14:03:29 +10:00
Bharata B Rao 1c59eb39cf exec: Remove cpu from cpus list during cpu_exec_exit()
CPUState *cpu gets added to the cpus list during cpu_exec_init(). It
should be removed from cpu_exec_exit().

cpu_exec_exit() is called from generic CPU::instance_finalize and some
archs like PowerPC call it from CPU unrealizefn. So ensure that we
dequeue the cpu only once.

Now -1 value for cpu->cpu_index indicates that we have already dequeued
the cpu for CONFIG_USER_ONLY case also.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2016-05-30 13:22:20 +10:00
Paolo Bonzini 0878d0e11b exec: hide mr->ram_addr from qemu_get_ram_ptr users
Let users of qemu_get_ram_ptr and qemu_ram_ptr_length pass in an
address that is relative to the MemoryRegion.  This basically means
what address_space_translate returns.

Because the semantics of the second parameter change, rename the
function to qemu_map_ram_ptr.

Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-05-29 09:11:12 +02:00
Paolo Bonzini 07bdaa4196 memory: split memory_region_from_host from qemu_ram_addr_from_host
Move the old qemu_ram_addr_from_host to memory_region_from_host and
make it return an offset within the region.  For qemu_ram_addr_from_host
return the ram_addr_t directly, similar to what it was before
commit 1b5ec23 ("memory: return MemoryRegion from qemu_ram_addr_from_host",
2013-07-04).

Reviewed-by: Marc-André Lureau <marcandre.lureau@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-05-29 09:11:12 +02:00
Paolo Bonzini f615f39616 exec: remove ram_addr argument from qemu_ram_block_from_host
Of the two callers, one does not use it, and the other can compute
it itself based on the other output argument (offset) and the RAMBlock.

Reviewed-by: Marc-André Lureau <marcandre.lureau@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-05-29 09:11:12 +02:00
Paolo Bonzini 4ff87573df memory: remove qemu_get_ram_fd, qemu_set_ram_fd, qemu_ram_block_host_ptr
Remove direct uses of ram_addr_t and optimize memory_region_{get,set}_fd
now that a MemoryRegion knows its RAMBlock directly.

Reviewed-by: Marc-André Lureau <marcandre.lureau@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-05-29 09:11:12 +02:00
Paolo Bonzini e4e697940d memory: remove unnecessary masking of MemoryRegion ram_addr
mr->ram_block->offset is already aligned to both host and target size
(see qemu_ram_alloc_internal).  Remove further masking as it is
unnecessary.

Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-05-23 16:53:45 +02:00
Gonglei ab0a995608 exec: adjust rcu_read_lock requirement
qemu_ram_unset_idstr() doesn't need rcu lock anymore,
meanwhile make the range of rcu lock in
qemu_ram_set_idstr() as small as possible.

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Message-Id: <1462845901-89716-3-git-send-email-arei.gonglei@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-05-23 16:53:44 +02:00
Gonglei fa53a0e53e memory: drop find_ram_block()
On the one hand, we have already qemu_get_ram_block() whose function
is similar. On the other hand, we can directly use mr->ram_block but
searching RAMblock by ram_addr which is a kind of waste.

Signed-off-by: Gonglei <arei.gonglei@huawei.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-Id: <1462845901-89716-2-git-send-email-arei.gonglei@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-05-23 16:53:44 +02:00
Dominik Dingel d2f39add72 exec.c: Ensure right alignment also for file backed ram
While in the anonymous ram case we already take care of the right alignment
such an alignment gurantee does not exist for file backed ram allocation.

Instead, pagesize is used for alignment. On s390 this is not enough for gmap,
as we need to satisfy an alignment up to segments.

Reported-by: Halil Pasic <pasic@linux.vnet.ibm.com>
Signed-off-by: Dominik Dingel <dingel@linux.vnet.ibm.com>

Message-Id: <1461585338-45863-1-git-send-email-dingel@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-05-23 16:53:42 +02:00
Paolo Bonzini df43d49cb8 hw: clean up hw/hw.h includes
Include qom/object.h and exec/memory.h instead of exec/ioport.h;
exec/ioport.h was almost everywhere required only for those two
includes, not for the content of the header itself.

Remove block/aio.h, everybody is already including it through
another path.

With this change, include/hw/hw.h is freed from qemu-common.h.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-05-19 16:42:30 +02:00
Paolo Bonzini 63c915526d cpu: move exec-all.h inclusion out of cpu.h
exec-all.h contains TCG-specific definitions.  It is not needed outside
TCG-specific files such as translate.c, exec.c or *helper.c.

One generic function had snuck into include/exec/exec-all.h; move it to
include/qom/cpu.h.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-05-19 16:42:29 +02:00
Paolo Bonzini 33c11879fd qemu-common: push cpu.h inclusion out of qemu-common.h
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-05-19 16:42:29 +02:00
Paolo Bonzini 741da0d38b hw: cannot include hw/hw.h from user emulation
All qdev definitions are available from other headers, user-mode
emulation does not need hw/hw.h.

By considering system emulation only, it is simpler to disentangle
hw/hw.h from NEED_CPU_H.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-05-19 16:42:28 +02:00
Emilio G. Cota 89fee74a0f tb: consistently use uint32_t for tb->flags
We are inconsistent with the type of tb->flags: usage varies loosely
between int and uint64_t. Settle to uint32_t everywhere, which is
superior to both: at least one target (aarch64) uses the most significant
bit in the u32, and uint64_t is wasteful.

Compile-tested for all targets.

Suggested-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Suggested-by: Richard Henderson <rth@twiddle.net>
Tested-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Reviewed-by: Laurent Desnogues <laurent.desnogues@gmail.com>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Message-Id: <1460049562-23517-1-git-send-email-cota@braap.org>
2016-05-12 14:06:40 -10:00
Marc-André Lureau 85bc2a1512 memory: fix segv on qemu_ram_free(block=0x0)
Since f1060c55bf, the pointer is directly passed to
qemu_ram_free(). However, on initialization failure, it may be called
with a NULL pointer. Return immediately in this case.

This fixes a SEGV when memory initialization failed, for example
permission denied on open backing store /dev/hugepages, with -object
memory-backend-file,mem-path=/dev/hugepages.

Program received signal SIGSEGV, Segmentation fault.
0x00005555556e67e7 in qemu_ram_free (block=0x0) at /home/elmarco/src/qemu/exec.c:1775

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <1459250451-29984-1-git-send-email-marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-04-05 11:46:52 +02:00
Paolo Bonzini 5c3ece79cd exec: fix error handling in file_ram_alloc
One instance of double closing, and invalid close(-1) in some cases
of "goto error".

Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-03-22 22:20:18 +01:00
Veronia Bahaa f348b6d1a5 util: move declarations out of qemu-common.h
Move declarations out of qemu-common.h for functions declared in
utils/ files: e.g. include/qemu/path.h for utils/path.c.
Move inline functions out of qemu-common.h and into new files (e.g.
include/qemu/bcd.h)

Signed-off-by: Veronia Bahaa <veroniabahaa@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-03-22 22:20:17 +01:00
Markus Armbruster da34e65cb4 include/qemu/osdep.h: Don't include qapi/error.h
Commit 57cb38b included qapi/error.h into qemu/osdep.h to get the
Error typedef.  Since then, we've moved to include qemu/osdep.h
everywhere.  Its file comment explains: "To avoid getting into
possible circular include dependencies, this file should not include
any other QEMU headers, with the exceptions of config-host.h,
compiler.h, os-posix.h and os-win32.h, all of which are doing a
similar job to this file and are under similar constraints."
qapi/error.h doesn't do a similar job, and it doesn't adhere to
similar constraints: it includes qapi-types.h.  That's in excess of
100KiB of crap most .c files don't actually need.

Add the typedef to qemu/typedefs.h, and include that instead of
qapi/error.h.  Include qapi/error.h in .c files that need it and don't
get it now.  Include qapi-types.h in qom/object.h for uint16List.

Update scripts/clean-includes accordingly.  Update it further to match
reality: replace config.h by config-target.h, add sysemu/os-posix.h,
sysemu/os-win32.h.  Update the list of includes in the qemu/osdep.h
comment quoted above similarly.

This reduces the number of objects depending on qapi/error.h from "all
of them" to less than a third.  Unfortunately, the number depending on
qapi-types.h shrinks only a little.  More work is needed for that one.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
[Fix compilation without the spice devel packages. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-03-22 22:20:15 +01:00
Paolo Bonzini 39c350ee12 exec: fix early return from ram_block_add
After reporting an error, ram_block_add was going on with the registration
of the RAMBlock.  The visible effect is that it unlocked the ramlist
mutex twice.

Fixes: 528f46af6e
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-03-15 18:23:33 +01:00
Markus Armbruster e1fb647199 exec: Fix memory allocation when memory path isn't on hugetlbfs
gethugepagesize() works reliably only when its argument is on
hugetlbfs.  When it's not, it returns the filesystem's "optimal
transfer block size", which may or may not be the actual page size
you'll get when you mmap().

If the value is too small or not a power of two, we fail
qemu_ram_mmap()'s assertions.  These were added in commit 794e8f3
(v2.5.0).  The bug's impact before that is currently unknown.  Seems
fairly unlikely at least when the normal page size is 4KiB.

Else, if the value is too large, we align more strictly than
necessary.

gethugepagesize() goes back to commit c902760 (v0.13).  That commit
clearly intended gethugepagesize() to be used on hugetlbfs only.  Not
only was it named accordingly, it also printed a warning when used on
anything else.  However, the commit neglected to spell out the
restriction in user documentation of -mem-path.

Commit bfc2a1a (v2.5.0) dropped the warning as bogus "because QEMU
functions perfectly well with the path on a regular tmpfs filesystem".
It sure does when you're sufficiently lucky.  In my testing, I was
lucky, too.

Fix by switching to qemu_fd_getpagesize().  Rename the variable
holding its result from hpagesize to page_size.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1457378754-21649-3-git-send-email-armbru@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-03-15 18:23:33 +01:00
Markus Armbruster fd97fd4408 exec: Fix memory allocation when memory path names new file
Commit 8d31d6b extended file_ram_alloc() to accept file names in
addition to directory names.  Even though it passes O_CREAT to open(),
it actually works only for existing files.  Reproducer adapted from
the commit's qemu-doc.texi update:

    $ qemu-system-x86_64 -object memory-backend-file,size=2M,mem-path=/dev/hugepages/my-shmem-file,id=mb1
    qemu-system-x86_64: -object memory-backend-file,size=2M,mem-path=/dev/hugepages/my-shmem-file,id=mb1: failed to get page size of file /dev/hugepages/my-shmem-file: No such file or directory

This is because we first get the page size for @path, then open the
actual file.  Unwise even before the flawed commit, because the
directory could change in between, invalidating the page size.
Unlikely to bite in practice.

Rearrange the code to create the file (if necessary) before getting
its page size.  Carefully avoid TOCTTOU conditions with a method
suggested by Paolo Bonzini.

While there, replace "hugepages" by "guest RAM" in error messages,
because host memory backends can be used for purposes other than huge
pages, e.g. /dev/shm/ shared memory.  Help text of -mem-path agrees.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1457378754-21649-2-git-send-email-armbru@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-03-15 18:23:33 +01:00
Fam Zheng 729633c2bc exec: Introduce AddressSpaceDispatch.mru_section
Under heavy workloads the lookup will likely end up with the same
MemoryRegionSection from last time. Using a pointer to cache the result,
like ram_list.mru_block, significantly reduces cost of
address_space_translate.

During address space topology update, as->dispatch will be reallocated
so the pointer is invalidated automatically.

Perf reports a visible drop on the cpu usage, because phys_page_find is
not called.  Before:

   2.35%  qemu-system-x86_64       [.] phys_page_find
   0.97%  qemu-system-x86_64       [.] address_space_translate_internal
   0.95%  qemu-system-x86_64       [.] address_space_translate
   0.55%  qemu-system-x86_64       [.] address_space_lookup_region

After:

   0.97%  qemu-system-x86_64       [.] address_space_translate_internal
   0.97%  qemu-system-x86_64       [.] address_space_lookup_region
   0.84%  qemu-system-x86_64       [.] address_space_translate

Signed-off-by: Fam Zheng <famz@redhat.com>
Message-Id: <1456813104-25902-8-git-send-email-famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-03-07 13:26:37 +01:00
Fam Zheng 29cb533d8c exec: Factor out section_covers_addr
This will be shared by the next patch.

Also add a comment explaining the unobvious condition on "size.hi".

Signed-off-by: Fam Zheng <famz@redhat.com>
Message-Id: <1456813104-25902-7-git-send-email-famz@redhat.com>
[Small change to the comment. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-03-07 13:26:37 +01:00
Fam Zheng f1060c55bf exec: Pass RAMBlock pointer to qemu_ram_free
The only caller now knows exactly which RAMBlock to free, so it's not
necessary to do the lookup.

Reviewed-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Message-Id: <1456813104-25902-6-git-send-email-famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-03-07 13:26:37 +01:00
Fam Zheng 8e41fb63c5 memory: Drop MemoryRegion.ram_addr
All references to mr->ram_addr are replaced by
memory_region_get_ram_addr(mr) (except for a few assertions that are
replaced with mr->ram_block).

Reviewed-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Message-Id: <1456813104-25902-5-git-send-email-famz@redhat.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-03-07 13:26:29 +01:00