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: Paul Brook <paul@codesourcery.com>
In the human monitor, it declares a single optional argument to be
parsed according to the QemuOptsList given by its name.
In QMP, it declares an optional argument for each member of the
QemuOptsList.
Restriction: only lists with empty desc are supported for now. Good
enough for the job at hand. We'll lift the restriction when we need
that.
We sometimes permit omitting the first option name, for example
-device foo is short for -device driver=foo. The name to use
("driver" in the example) is passed as argument to qemu_opts_parse().
For each QemuOptsList, we use at most one such name.
Move the name into QemuOptsList, and pass whether to permit the
abbreviation. This ensures continued consistency, and simplifies the
commit after next in this series.
This reverts commit 3ced9f7a36.
The next commit will convert all of qdev_device_add() to QError, and
it'll be clearer with this partial conversion reverted.
While fully converted handlers are not supposed to print anything when
running in a QMP monitor, they are free to print in a human monitor.
For instance, device_add (not yet converted) prints help, and will
continue to do so after conversion.
Moreover, utility functions converted to QError should remain usable
from unconverted handlers.
Two problems:
* handler_audit() complains when a converted handler prints. Limit
that to QMP monitors.
* With QMP, handlers need to pass the error object by way of
monitor_set_error(). However, we do that both for QMP and for the
human monitor. The human monitor prints the error object after the
handler returns. If the handler prints anything else, that output
"overtakes" the error message.
Limit use of monitor_set_error() to QMP monitors. Update
handler_audit() accordingly.
Users can't set them, so qdev_device_help() shouldn't list them. Fix
that. Also make qdev_prop_parse() hide them instead of printing a
meaningless "has no parser" error message.
Their value means nothing to users, so qdev_print_props() shouldn't
print it. Fix by removing their print method.
Their only use is dirty hacks. Document that.
Users can't create them, so qdev_device_help() shouldn't list them.
Fix that.
Also make qdev_device_add() pretend they don't exist. Before, it
rejected them with a "can't be added via command line" message, which
wasn't quite right for monitor command device_add.
New LOC_CMDLINE. Use it for tracking option with argument in
lookup_opt(). We now report errors like this
qemu: -device smbus-eeprom: Did not find I2C bus for smbus-eeprom
New LOC_FILE. Use it for tracking file name and line number in
qemu_config_parse(). We now report errors like
qemu:foo.conf:42: Did not find I2C bus for smbus-eeprom
In particular, gems like this message:
-device: no driver specified
become almost nice now:
qemu:foo.conf:44: -device: no driver specified
(A later commit will get rid of the bogus -device:)
New struct Location holds a location. So far, the only location is
LOC_NONE, so this doesn't do anything useful yet.
Passing the current location all over the place would be too
cumbersome. Hide it away in static cur_loc instead, and provide
accessors. Print it in error_report().
Store it in QError, and print it in qerror_print().
Store it in QemuOpt, for use by qemu_opts_foreach(). This makes
error_report() do the right thing when it runs within
qemu_opts_foreach().
We may still have to store it in other data structures holding user
input for better error messages. Left for another day.
error_report() terminates the message with a newline. Strip it it
from its arguments.
This fixes a few error messages lacking a newline:
net_handle_fd_param()'s "No file descriptor named %s found", and
tap_open()'s "vnet_hdr=1 requested, but no kernel support for
IFF_VNET_HDR available" (all three versions).
There's one place that passes arguments without newlines
intentionally: load_vmstate(). Fix it up.
Commit 30d335d6 converted an informational message from
monitor_printf() to qemu_error(), probably because the latter doesn't
need a mon argument. A later commit will make qemu_error() print
additional stuff that is only appropriate for proper errors, and then
this will break. Clean it up.
qbus_find() adds an informational line to error messages, and prints
both lines with one qemu_error(). Use error_printf() for the
informational line instead.
While there, simplify: instead of printing buffers filled by
qbus_list_bus() and qbus_list_dev() in one go, make them print it.
qdev_device_help() prints device information with qemu_error(). A
later commit will make qemu_error() print additional stuff that is
only appropriate for proper errors, and then this will break. Use
error_printf() instead.
While there, simplify: instead of printing a buffer filled by
qdev_print_devinfo() in one go, make qdev_print_devinfo() print it.
qemu_error_sink can either point to a monitor or a file. In practice,
it always points to the current monitor if we have one, else to
stderr. Simply route errors to the current monitor or else to stderr,
and remove qemu_error_sink along with the functions to control it.
Actually, the old code switches the sink slightly later, in
handle_user_command() and handle_qmp_command(), than it gets switched
now, implicitly, by setting the current monitor in monitor_read() and
monitor_control_read(). Likewise, it switches back slightly earlier
(same places). Doesn't make a difference, because there are no calls
of qemu_error() in between.
The old test assumes that "hotplugged" implies "we have a current
monitor for reading the key". This is in fact true, but it's not
obviously true.
Aside: if it were false, we could pass a null pointer to
monitor_read_bdrv_key_start(), which would then crash.
The previous commit permits us to check for "we have a current
monitor" directly, so do that.
