qemu/include
David Gibson 3898aad323 vfio: Check guest IOVA ranges against host IOMMU capabilities
The current vfio core code assumes that the host IOMMU is capable of
mapping any IOVA the guest wants to use to where we need.  However, real
IOMMUs generally only support translating a certain range of IOVAs (the
"DMA window") not a full 64-bit address space.

The common x86 IOMMUs support a wide enough range that guests are very
unlikely to go beyond it in practice, however the IOMMU used on IBM Power
machines - in the default configuration - supports only a much more limited
IOVA range, usually 0..2GiB.

If the guest attempts to set up an IOVA range that the host IOMMU can't
map, qemu won't report an error until it actually attempts to map a bad
IOVA.  If guest RAM is being mapped directly into the IOMMU (i.e. no guest
visible IOMMU) then this will show up very quickly.  If there is a guest
visible IOMMU, however, the problem might not show up until much later when
the guest actually attempt to DMA with an IOVA the host can't handle.

This patch adds a test so that we will detect earlier if the guest is
attempting to use IOVA ranges that the host IOMMU won't be able to deal
with.

For now, we assume that "Type1" (x86) IOMMUs can support any IOVA, this is
incorrect, but no worse than what we have already.  We can't do better for
now because the Type1 kernel interface doesn't tell us what IOVA range the
IOMMU actually supports.

For the Power "sPAPR TCE" IOMMU, however, we can retrieve the supported
IOVA range and validate guest IOVA ranges against it, and this patch does
so.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
2015-10-05 12:38:13 -06:00
..
block block: Introduce a new API bdrv_co_no_copy_on_readv() 2015-09-25 08:37:07 -04:00
crypto crypto: introduce new module for handling TLS sessions 2015-09-15 15:07:43 +01:00
disas disas: Add print_insn to disassemble info 2015-07-09 15:20:40 +02:00
exec include/exec: Move cputlb exec.c defs out 2015-09-16 17:33:33 +02:00
fpu softfloat: expand out STATUS macro 2015-02-06 16:11:38 +00:00
hw vfio: Check guest IOVA ranges against host IOMMU capabilities 2015-10-05 12:38:13 -06:00
libdecnumber Fix new typos in comments (found by codespell) 2014-07-18 17:45:36 +04:00
migration migration: qemu-file more size_t'ifying 2015-09-29 11:33:02 +05:30
monitor hmp: added io apic dump state 2015-09-25 12:04:42 +02:00
net vhost-user: add a new message to disable/enable a specific virt queue. 2015-09-24 16:27:53 +03:00
qapi qapi: Introduce a first class 'any' type 2015-09-21 09:56:49 +02:00
qemu typedef: add typedef for QemuOpts 2015-09-25 12:04:45 +02:00
qom cpu: Provide vcpu throttling interface 2015-09-30 09:42:04 +02:00
standard-headers target-i386: move asm-x86/hyperv.h to standard-headers 2015-09-16 17:33:32 +02:00
sysemu oslib-win32: only provide localtime_r/gmtime_r if missing 2015-09-24 21:13:49 +02:00
ui gtk: avoid redefining _WIN32_WINNT macro 2015-09-24 20:52:28 +02:00
config.h janitor: move remaining public headers to include/ 2012-12-19 08:32:46 +01:00
elf.h elf: Update EM_MOXIE definition 2015-09-25 12:04:43 +02:00
glib-compat.h glib: remove stale compat functions 2015-05-22 15:58:06 -04:00
qemu-common.h utils: rename strtosz to use qemu prefix 2015-09-25 12:04:41 +02:00
qemu-io.h qemu-io: Use BlockBackend 2015-02-16 15:07:19 +00:00
qjson.h QJSON: Add JSON writer 2015-02-05 17:16:14 +01:00
trace-tcg.h trace: [tcg] Generate TCG tracing routines 2014-08-12 14:26:12 +01:00
trace.h trace: [tcg] Include event definitions in "trace.h" 2014-08-12 14:26:12 +01:00