aboutsummaryrefslogtreecommitdiff
path: root/exec.c
AgeCommit message (Collapse)Author
2012-02-29memory: allow phys_map tree paths to terminate earlyAvi Kivity
When storing large contiguous ranges in phys_map, all values tend to be the same pointers to a single MemoryRegionSection. Collapse them by marking nodes with level > 0 as leaves. This reduces tree memory usage dramatically. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-02-29memory: unify PhysPageEntry::node and ::leafAvi Kivity
They have the same type, unify them. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-02-29memory: change phys_page_set() to set multiple pagesAvi Kivity
Signed-off-by: Avi Kivity <avi@redhat.com>
2012-02-29memory: switch phys_page_set() to a recursive implementationAvi Kivity
Setting multiple pages at once requires backtracking to previous nodes; easiest to achieve via recursion. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-02-29memory: replace phys_page_find_alloc() with phys_page_set()Avi Kivity
By giving the function the value we want to set, we make it more flexible for the next patch. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-02-29memory: simplify multipage/subpage registrationAvi Kivity
Instead of considering subpage on a per-page basis, split each section into a subpage head, multipage body, and subpage tail, and register each separately. This simplifies the registration functions. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-02-29memory: give phys_page_find() its own tree search loopAvi Kivity
We'll change phys_page_find_alloc() soon, but phys_page_find() doesn't need to bear the consequences. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-02-29memory: make phys_page_find() return a MemoryRegionSectionAvi Kivity
We no longer describe memory in terms of individual pages; use sections throughout instead. PhysPageDesc no longer used - remove. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-02-29memory: move tlb flush to MemoryListener commit callbackAvi Kivity
This way, if we have several changes in a single transaction, we flush just once. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-02-29memory: unify the two branches of cpu_register_physical_memory_log()Avi Kivity
Identical except that the second branch knows its not modifying an existing subpage. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-02-29memory: fix RAM subpages in newly initialized pagesAvi Kivity
If the first subpage installed in a page is RAM, then we install it as a full page, instead of a subpage. Fix by not special casing RAM. The issue dates to commit db7b5426a4b4242, which introduced subpages. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-02-29memory: compress phys_map node pointers to 16 bitsAvi Kivity
Use an expanding vector to store nodes. Allocation is baroque to g_renew() potentially invalidating pointers; this will be addressed later. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-02-29memory: store MemoryRegionSection pointers in phys_mapAvi Kivity
Instead of storing PhysPageDesc, store pointers to MemoryRegionSections. The various offsets (phys_offset & ~TARGET_PAGE_MASK, PHYS_OFFSET & TARGET_PAGE_MASK, region_offset) can all be synthesized from the information in a MemoryRegionSection. Adjust phys_page_find() to synthesize a PhysPageDesc. The upshot is that phys_map now contains uniform values, so it's easier to generate and compress. The end result is somewhat clumsy but this will be improved as we we propagate MemoryRegionSections throughout the code instead of transforming them to PhysPageDesc. The MemoryRegionSection pointers are stored as uint16_t offsets in an array. This saves space (when we also compress node pointers) and is more cache friendly. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-02-29memory: unify phys_map last level with intermediate levelsAvi Kivity
This lays the groundwork for storing leaf data in intermediate levels, saving space. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-02-29memory: remove first level of l1_phys_mapAvi Kivity
L1 and the lower levels in l1_phys_map are equivalent, except that L1 has a different size, and is always allocated. Simplify the code by removing L1. This leaves us with a tree composed solely of L2 tables, but that problem can be renamed away later. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-02-29memory: change memory registration to rebuild the memory map on each changeAvi Kivity
Instead of incrementally building the memory map, rebuild it every time. This allows later simplification, since the code need not consider overlaying a previous mapping. It is also RCU friendly. With large memory guests this can get expensive, since the operation is O(mem size), but this will be optimized later. As a side effect subpage and L2 leaks are fixed here. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-02-29memory: support stateless memory listenersAvi Kivity
Current memory listeners are incremental; that is, they are expected to maintain their own state, and receive callbacks for changes to that state. This patch adds support for stateless listeners; these work by receiving a ->begin() callback (which tells them that new state is coming), a sequence of ->region_add() and ->region_nop() callbacks, and then a ->commit() callback which signifies the end of the new state. They should ignore ->region_del() callbacks. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-02-29memory: split memory listener for the two address spacesAvi Kivity
The memory and I/O address spaces do different things, so split them into two memory listeners. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-02-29memory: allow MemoryListeners to observe a specific address spaceAvi Kivity
Ignore any regions not belonging to a specified address space. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-02-29memory: use a MemoryListener for core memory map updates tooAvi Kivity
This transforms memory.c into a library which can then be unit tested easily, by feeding it inputs and listening to its outputs. Signed-off-by: Avi Kivity <avi@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
2012-02-29memory: don't pass ->readable attribute to cpu_register_physical_memory_logAvi Kivity
It can be derived from the MemoryRegion itself (which is why it is not used there). Signed-off-by: Avi Kivity <avi@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
2012-02-01exec.c: Clarify comment about tlb_flush() flush_global parameterPeter Maydell
Clarify the comment about tlb_flush()'s flush_global parameter, so it is clearer what it does and why it is OK that the implementation currently ignores it. Reviewed-by: Andreas F=C3=A4rber <afaerber@suse.de> Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-01-21virtio-pci: Fix endianness of virtio configBenjamin Herrenschmidt
The virtio config area in PIO space is a bit special. The initial header is little endian but the rest (device specific) is guest native endian. The PIO accessors for PCI on machines that don't have native IO ports assume that all PIO is little endian, which works fine for everything except the above. A complicated way to fix it would be to split the BAR into two memory regions with different endianess settings, but this isn't practical to do, besides, the PIO code doesn't honor region endianness anyway (I have a patch for that too but it isn't necessary at this stage). So I decided to go for the quick fix instead which consists of reverting the swap in virtio-pci in selected places, hoping that when we eventually do a "v2" of the virtio protocols, we sort that out once and for all using a fixed endian setting for everything. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Alexander Graf <agraf@suse.de> [agraf: keep virtio in libhw and determine endianness through a helper function in exec.c] Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
2012-01-13tcg-arm: fix a typo in commentsAurelien Jarno
ARM still doesn't support 16GB buffers in 32-bit modes, replace the 16GB by 16MB in the comment. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
2012-01-04Remove IO_MEM_SHIFTAvi Kivity
We no longer use any of the lower bits of a ram_addr, so we might as well use them for the io table index. This increases the number of potential I/O handlers by a factor of 8. Signed-off-by: Avi Kivity <avi@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
2012-01-04Drop IO_MEM_ROMDAvi Kivity
Unlike ->readonly, ->readable is not inherited from aliase, so we can simply query the memory region. Signed-off-by: Avi Kivity <avi@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
2012-01-04Remove IO_MEM_SUBPAGEAvi Kivity
Replace with a MemoryRegion flag. Signed-off-by: Avi Kivity <avi@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
2012-01-04Direct dispatch through MemoryRegionAvi Kivity
Now that all mmio goes through MemoryRegions, we can convert io_mem_opaque to be a MemoryRegion pointer, and remove the thunks that convert from old-style CPU{Read,Write}MemoryFunc to MemoryRegionOps. Signed-off-by: Avi Kivity <avi@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
2012-01-04Convert io_mem_watch to be a MemoryRegionAvi Kivity
Signed-off-by: Avi Kivity <avi@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
2012-01-04Convert IO_MEM_SUBPAGE_RAM to be a MemoryRegionAvi Kivity
Signed-off-by: Avi Kivity <avi@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
2012-01-04Convert the subpage wrapper to be a MemoryRegionAvi Kivity
Signed-off-by: Avi Kivity <avi@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
2012-01-04Switch cpu_register_physical_memory_log() to use MemoryRegionsAvi Kivity
Still internally using ram_addr. Signed-off-by: Avi Kivity <avi@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
2012-01-04Convert IO_MEM_{RAM,ROM,UNASSIGNED,NOTDIRTY} to MemoryRegionsAvi Kivity
Convert the fixed-address IO_MEM_RAM, IO_MEM_ROM, IO_MEM_UNASSIGNED, and IO_MEM_NOTDIRTY io handlers to MemoryRegions. These aren't real regions, since they are never added to the memory hierarchy, but they allow reuse of the dispatch functionality. Signed-off-by: Avi Kivity <avi@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
2012-01-04Uninline get_page_addr_code()Avi Kivity
Its use of IO_MEM_ROM and friends will later cause #include loops; and it is too large to merit inlining. Signed-off-by: Avi Kivity <avi@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
2012-01-04Avoid range comparisons on io index typesAvi Kivity
The code sometimes uses range comparisons on io indexes (e.g. index =< IO_MEM_ROM). Avoid these as they make moving to objects harder. Signed-off-by: Avi Kivity <avi@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
2012-01-04Fix wrong region_offset when overlaying a page with anotherAvi Kivity
cpu_register_physical_memory_log() does not update region_offset if a page was previously registered for the same address. This could cause mmio accesses going to the wrong place, by using the old region_offset. Signed-off-by: Avi Kivity <avi@redhat.com> Acked-by: Andreas Färber <afaerber@suse.de> Reviewed-by: Richard Henderson <rth@twiddle.net>
2012-01-04memory: move mmio access to functionsAvi Kivity
Currently mmio access goes directly to the io_mem_{read,write} arrays. In preparation for eliminating them, add indirection via a function. Signed-off-by: Avi Kivity <avi@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
2012-01-04exec: make phys_page_find() return a temporaryAvi Kivity
Instead of returning a PhysPageDesc pointer, return a temporary. This lets us move away from actually storing PhysPageDesc's, and instead sythesising them when needed. Signed-off-by: Avi Kivity <avi@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
2012-01-04memory: move endianness compensation to memory coreAvi Kivity
Instead of doing device endianness compensation in cpu_register_io_memory(), do it in the memory core. Signed-off-by: Avi Kivity <avi@redhat.com> Reviewed-by: Richard Henderson <rth@twiddle.net>
2012-01-04memory: obsolete cpu_physical_memory_[gs]et_dirty_tracking()Avi Kivity
The getter is no longer used, so it is completely removed. Reviewed-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-01-04Store MemoryRegion in RAMBlockAvi Kivity
As a step in moving live migration from RAMBlocks to MemoryRegions, store the MemoryRegion in a RAMBlock. Reviewed-by: Anthony Liguori <aliguori@us.ibm.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2012-01-04vmstate, memory: decouple vmstate from memory APIAvi Kivity
Currently creating a memory region automatically registers it for live migration. This differs from other state (which is enumerated in a VMStateDescription structure) and ties the live migration code into the memory core. Decouple the two by introducing a separate API, vmstate_register_ram(), for registering a RAM block for migration. Currently the same implementation is reused, but later it can be moved into a separate list, and registrations can be moved to VMStateDescription blocks. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-01-03Remove cpu_get_physical_page_desc()Avi Kivity
No longer used. Signed-off-by: Avi Kivity <avi@redhat.com>
2012-01-03memory: remove CPUPhysMemoryClientAvi Kivity
No longer used. Signed-off-by: Avi Kivity <avi@redhat.com>
2011-12-20memory: add API for observing updates to the physical memory mapAvi Kivity
Add an API that allows a client to observe changes in the global memory map: - region added (possibly with logging enabled) - region removed (possibly with logging enabled) - logging started on a region - logging stopped on a region - global logging started - global logging removed This API will eventually replace cpu_register_physical_memory_client(). Signed-off-by: Avi Kivity <avi@redhat.com>
2011-12-19memory: move obsolete exec.c functions to a private headerAvi Kivity
This will help avoid accidental usage. Signed-off-by: Avi Kivity <avi@redhat.com>
2011-12-19memory, xen: pass MemoryRegion to xen_ram_alloc()Avi Kivity
Currently xen_ram_alloc() relies on ram_addr, which is going away. Give it something else to use as a cookie. Signed-off-by: Avi Kivity <avi@redhat.com>
2011-12-15phys_page_find_alloc: Use correct initial region_offset.Alex Rozenman
This fixes a common bug with initial region_offset value. Usually, the pages are re-assigned afterwards, so the bug has a very small effect on regular QEMU use flows. Signed-off-by: Alex Rozenman <Alex_Rozenman@mentor.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-12-15exec.c: Fix subpage memory access to RAM MemoryRegionAndreas Färber
Commit 95c318f5e1f88d7e5bcc6deac17330fd4806a2d3 (Fix segfault in mmio subpage handling code.) prevented a segfault by making all subpage registrations over an existing memory page perform an unassigned access. Symptoms were writes not taking effect and reads returning zero. Very small page sizes are not currently supported either, so subpage memory areas cannot fully be avoided. Therefore change the previous fix to use a new IO_MEM_SUBPAGE_RAM instead of IO_MEM_UNASSIGNED. Suggested by Avi. Reviewed-by: Avi Kivity <avi@redhat.com> Signed-off-by: Andreas Färber <afaerber@suse.de> Cc: Avi Kivity <avi@redhat.com> Cc: Gleb Natapov <gleb@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2011-12-14tcg/arm: remove fixed map code buffer restrictionDr. David Alan Gilbert
On ARM, don't map the code buffer at a fixed location, and fix up the call/goto tcg routines to let it do long jumps. Mapping the code buffer at a fixed address could sometimes result in it being mapped over the top of the heap with pretty random results. Signed-off-by: Dr. David Alan Gilbert <david.gilbert@linaro.org> Signed-off-by: Andrzej Zaborowski <andrew.zaborowski@intel.com>
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-14 23:39:33 +0000