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  • Anton Anton anjo
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  1. May 11, 2010
  3. Apr 04, 2010
    • Paul Brook's avatar
      Split TLB addend and target_phys_addr_t · 355b1943
      Paul Brook authored 
      
Historically the qemu tlb "addend" field was used for both RAM and IO accesses,
so needed to be able to hold both host addresses (unsigned long) and guest
physical addresses (target_phys_addr_t).  However since the introduction of
the iotlb field it has only been used for RAM accesses.

This means we can change the type of addend to unsigned long, and remove
associated hacks in the big-endian TCG backends.

We can also remove the host dependence from target_phys_addr_t.

Signed-off-by: default avatarPaul Brook <paul@codesourcery.com>
      355b1943
  5. Mar 17, 2010
    • Paul Brook's avatar
      Large page TLB flush · d4c430a8
      Paul Brook authored 
      
QEMU uses a fixed page size for the CPU TLB.  If the guest uses large
pages then we effectively split these into multiple smaller pages, and
populate the corresponding TLB entries on demand.

When the guest invalidates the TLB by virtual address we must invalidate
all entries covered by the large page.  However the address used to
invalidate the entry may not be present in the QEMU TLB, so we do not
know which regions to clear.

Implementing a full vaiable size TLB is hard and slow, so just keep a
simple address/mask pair to record which addresses may have been mapped by
large pages.  If the guest invalidates this region then flush the
whole TLB.

Signed-off-by: default avatarPaul Brook <paul@codesourcery.com>
      d4c430a8
  7. Mar 12, 2010
  9. Feb 03, 2010
  11. Dec 18, 2009
  13. Dec 12, 2009
  15. Oct 01, 2009
  17. Sep 12, 2009
    • Blue Swirl's avatar
      Fix sys-queue.h conflict for good · 72cf2d4f
      Blue Swirl authored 
      
Problem: Our file sys-queue.h is a copy of the BSD file, but there are
some additions and it's not entirely compatible. Because of that, there have
been conflicts with system headers on BSD systems. Some hacks have been
introduced in the commits 15cc9235,
f40d7537,
96555a96 and
3990d09a but the fixes were fragile.

Solution: Avoid the conflict entirely by renaming the functions and the
file. Revert the previous hacks.

Signed-off-by: default avatarBlue Swirl <blauwirbel@gmail.com>
      72cf2d4f
  19. Aug 28, 2009
    • Andre Przywara's avatar
      extend -smp parsing to include cores= and threads= options · dc6b1c09
      Andre Przywara authored 
      
For injecting multi-core and multi-threading CPU topology into guests
extend the -smp syntax to accommodate cores and threads specification.
Syntax: -smp smp_value[,cores=nr_cores][,threads=nr_threads]\
[,socket=nr_sockets][,maxcpus=max_cpus]
smp_value is the legacy value specifying the total number of vCPUs for
the guest. If you specify one of cores, threads or sockets this value
can be omitted. Missing values will be computed to fulfill:
smp_value = nr_cores * nr_threads * nr_sockets
where it will favour sockets over cores over threads (to mimic the
current behavior, which will only inject multiple sockets.)
So -smp 4,threads=2 will inject two sockets with 2 threads each,
-smp cores=4 is an abbreviation for -smp 4,cores=4,threads=1,sockets=1.
If max_cpus (the number of hotpluggable CPUs) is omitted, it will
be set to smp_value.

Signed-off-by: default avatarAndre Przywara <andre.przywara@amd.com>
Signed-off-by: default avatarAnthony Liguori <aliguori@us.ibm.com>
      dc6b1c09
  21. Jul 27, 2009
  23. Jul 16, 2009
  25. Jun 04, 2009
    • Nathan Froyd's avatar
      fix gdbstub support for multiple threads in usermode, v3 · 1e9fa730
      Nathan Froyd authored 
      
When debugging multi-threaded programs, QEMU's gdb stub would report the
correct number of threads (the qfThreadInfo and qsThreadInfo packets).
However, the stub was unable to actually switch between threads (the T
packet), since it would report every thread except the first as being
dead.  Furthermore, the stub relied upon cpu_index as a reliable means
of assigning IDs to the threads.  This was a bad idea; if you have this
sequence of events:

initial thread created
new thread #1
new thread #2
thread #1 exits
new thread #3

thread #3 will have the same cpu_index as thread #1, which would confuse
GDB.  (This problem is partly due to the remote protocol not having a
good way to send thread creation/destruction events.)

We fix this by using the host thread ID for the identifier passed to GDB
when debugging a multi-threaded userspace program.  The thread ID might
wrap, but the same sort of problems with wrapping thread IDs would come
up with debugging programs natively, so this doesn't represent a
problem.

Signed-off-by: default avatarNathan Froyd <froydnj@codesourcery.com>
      1e9fa730
  27. May 19, 2009
    • Paul Brook's avatar
      Hardware convenience library · 1ad2134f
      Paul Brook authored 
      
The only target dependency for most hardware is sizeof(target_phys_addr_t).
Build these files into a convenience library, and use that instead of
building for every target.

Remove and poison various target specific macros to avoid bogus target
dependencies creeping back in.

Big/Little endian is not handled because devices should not know or care
about this to start with.

Signed-off-by: default avatarPaul Brook <paul@codesourcery.com>
      1ad2134f
  29. Apr 24, 2009
  31. Apr 21, 2009
  33. Mar 07, 2009
  35. Mar 06, 2009
    • Aurelien Jarno's avatar
      Fix race condition on access to env->interrupt_request · be214e6c
      Aurelien Jarno authored 
      
env->interrupt_request is accessed as the bit level from both main code
and signal handler, making a race condition possible even on CISC CPU.
This causes freeze of QEMU under high load when running the dyntick
clock.

The patch below move the bit corresponding to CPU_INTERRUPT_EXIT in a
separate variable, declared as volatile sig_atomic_t, so it should be
work even on RISC CPU.

We may want to move the cpu_interrupt(env, CPU_INTERRUPT_EXIT) case in
its own function and get rid of CPU_INTERRUPT_EXIT. That can be done
later, I wanted to keep the patch short for easier review.

Signed-off-by: default avatarAurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6728 c046a42c-6fe2-441c-8c8c-71466251a162
      be214e6c
  37. Jan 14, 2009
  39. Jan 04, 2009
  41. Nov 29, 2008
  43. Nov 25, 2008
  45. Nov 18, 2008
  47. Nov 05, 2008
    • Anthony Liguori's avatar
      Add KVM support to QEMU · 7ba1e619
      Anthony Liguori authored 
      
This patch adds very basic KVM support.  KVM is a kernel module for Linux that
allows userspace programs to make use of hardware virtualization support.  It
current supports x86 hardware virtualization using Intel VT-x or AMD-V.  It
also supports IA64 VT-i, PPC 440, and S390.

This patch only implements the bare minimum support to get a guest booting.  It
has very little impact the rest of QEMU and attempts to integrate nicely with
the rest of QEMU.

Even though this implementation is basic, it is significantly faster than TCG.
Booting and shutting down a Linux guest:

w/TCG:  1:32.36 elapsed  84% CPU

w/KVM:  0:31.14 elapsed  59% CPU

Right now, KVM is disabled by default and must be explicitly enabled with
 -enable-kvm.  We can enable it by default later when we have had better
testing.

Signed-off-by: default avatarAnthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5627 c046a42c-6fe2-441c-8c8c-71466251a162
      7ba1e619
  49. Oct 11, 2008
  51. Jul 01, 2008
  53. Jun 29, 2008
  55. Jun 09, 2008
    • Paul Brook's avatar
      Clean up MMIO TLB handling. · 0f459d16
      Paul Brook authored 
      The IO index is now stored in its own field, instead of being wedged
into the vaddr field.  This eliminates the ROMD and watchpoint host
pointer weirdness.  The IO index space is expanded by 1 bit, and
several additional bits are made available in the TLB vaddr field.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4704 c046a42c-6fe2-441c-8c8c-71466251a162
      0f459d16
  57. Jun 07, 2008
  59. May 29, 2008
  61. May 28, 2008
  63. Apr 27, 2008
  65. Apr 22, 2008
  67. Apr 08, 2008
  69. Feb 01, 2008
  71. Jan 31, 2008
  73. Dec 09, 2007