This should fix observed problems when creating a domain,
causing Xen to print "Could not find PTE entry for
address ...".
Signed-off-by: Keir Fraser <keir@xensource.com>
gnttab_transfer, with slightly rationalised interface and
simpler implementation inside Xen. This is a tiny chip off
the tip of a very big iceberg. :-)
Signed-off-by: Keir Fraser <keir@xensource.com>
in unstable (changeset aeaa3c83f6e5). Tested on a dual Opteron x86-64
machine with 4GB of memory and a tg3 modified to only DMA below 2GB.
- swiotlb_dma_supported() checked that the device DMA mask was equal
or bigger than 4GB, when in fact all that's needed is that the device
be able to DMA into the swiotlb aperture (1GB on my AMD x86-64
machine). Some device are actually only 31-bit DMA capable, so this
would've tripped them.
- On some platforms, PCI unmaps and syncs are nops, so there's no need to
keep track of the dma_addr they need after the initial mapping. The
DMA API supports this via the DECLARE_PCI_UNMAP_ADDR macros (see
Documentation/DMA-mapping.txt). Since the swiotlb code does make us of
the dma_addr for swiotlb_unmap_xxx and (more importantly)
swiotlb_dma_sync_xxx, we need to define them to something
meaningful.
Signed-Off-By: Muli Ben-Yehuda <mulix@mulix.org>
- page is moved next to store/console pages -- these are never put in the
free page pool by the domain
- xen_start_info is now a pointer to the original page instead of the copy
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
The driver exports xs_talkv to user-space, allowing programs running in
the domain to use the kernel's xenbus connection. Intended use is driver
domain device configuration where the driver domain is not the domain
running xenstored.
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
all register parameters are clobbered on return. Furthermore,
multicall arrays are clobbered on return from a multicall (only the
result field can be trusted!).
These restrictions are enforced by debug builds of Xen in the
following ways:
1. On completion of a multicall, the call array is overwritten
with garbage before writing in the result fields.
2. On completion of a hypercall, all parameter registers are
overwritten with garbage.
Signed-off-by: Keir Fraser <keir@xensource.com>
unpin", which is already implemented for x86_32. Since we now only pin
the root rather than any of the other levels, the overall performance
became better especially with workloads that require heavy memory
management operations.
On 8-way x86_64 xenlinux (dom0) the kernel build was improved by about
10% (using make -j32). Even a small setup like a UP HT system, I see
about 3% performance gain with kernel build (make -j4).
Lmbench also shows improvements in fork/exec/sh:
Processor, Processes - times in microseconds - smaller is better
--------------------------------------------------------------------
Host OS Mhz null null open slct sig sig fork exec sh =20
call I/O stat clos TCP inst hndl proc proc proc
--------- ------------- ---- ---- ---- ---- ---- ---- ---- ---- ----=20
Linux 2.6.12- 3786 1.13 1.36 3.93 6.04 10.5 1.43 4.33 536. 1446 3614
Linux 2.6.12- 3786 1.13 1.36 3.91 6.03 10.4 1.44 4.38 346. 1050 2831
Signed-off-by: Jun Nakajima <jun.nakajima@intel.com>
The root cause of bug 169 is, machine_to_phys_mapping, starting from
0xffff800000000000, is mapped using 2M pages. When the system has RAM
no more than 2G, only one 2M page is allocated and only one PDE entry is
created correspondingly, so calling mfn_to_pfn with mfn > 0x80000 will
overflow this 2M page and cause a unable handled kernel paging request.
The mfn > 0x80000 comes from PCI device I/O memory, here from AGP
display card when booting X server. Jun suggested to use something like
get_user() when accessing machine_to_phys_mapping.
Signed-off-by: Xin Li <xin.b.li@intel.com>
- keep count of free references
- let callbacks specify the number of references they need at least
- get rid of terminal reference
- simplify and more correct locking for callbacks
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
Fix start-of-day code and FOREIGN_FRAME() macro in light
of this. Also fix pfn_to_mfn() to mask off the foreign-frame
marker bit. The few places where we rely on that bit we read
out of the array directly, rather than using the pfn_to_mfn()
accessor macro.
This fixes, among other things, booting domU on PAE with swiotlb
disabled.
Signed-off-by: Keir Fraser <keir@xensource.com>
