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docs: avoid footnotes consisting of just URLs
Replace the footnotes with inline links whenever the footnote text consists of nothing but the URL. While at it, make the link texts consistent in the surrounding areas, for example avoiding usage of "here" for the link's text. In the case of acpi-bits.rst this fixes a build failure with Sphinx 8.1.0, because the FOSDEM link was duplicated in the paragraph and the new version is a lot stricter about unreferenced footnotes. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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@ -30,15 +30,20 @@ OS modules are generally written using low level languages such as C and
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low level assembly machine language. Writing test routines in a low level
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low level assembly machine language. Writing test routines in a low level
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language makes things more cumbersome. These and other reasons makes using
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language makes things more cumbersome. These and other reasons makes using
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bios-bits very attractive for testing bioses. More details on the inspiration
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bios-bits very attractive for testing bioses. More details on the inspiration
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for developing biosbits and its real life uses can be found in [#a]_ and [#b]_.
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for developing biosbits and its real life uses were presented `at Plumbers
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in 2011 <Plumbers_>`__ and `at Linux.conf.au in 2012 <Linux.conf.au_>`__.
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For QEMU, we maintain a fork of bios bits in gitlab along with all the
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For QEMU, we maintain a fork of bios bits in `gitlab`_, along with all
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dependent submodules `here <https://gitlab.com/qemu-project/biosbits-bits>`__.
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the dependent submodules. This fork contains numerous fixes, a newer
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This fork contains numerous fixes, a newer acpica and changes specific to
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acpica and changes specific to running these functional QEMU tests using
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running these functional QEMU tests using bits. The author of this document
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bits. The author of this document is the current maintainer of the QEMU
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is the sole maintainer of the QEMU fork of bios bits repository. For more
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fork of bios bits repository. For more information, please see `the
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information, please see author's `FOSDEM talk on this bios-bits based test
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author's FOSDEM presentation <FOSDEM_>`__ on this bios-bits based test framework.
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framework <https://fosdem.org/2024/schedule/event/fosdem-2024-2262-exercising-qemu-generated-acpi-smbios-tables-using-biosbits-from-within-a-guest-vm-/>`__.
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.. _Plumbers: https://blog.linuxplumbersconf.org/2011/ocw/system/presentations/867/original/bits.pdf
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.. _Linux.conf.au: https://www.youtube.com/watch?v=36QIepyUuhg
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.. _gitlab: https://gitlab.com/qemu-project/biosbits-bits
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.. _FOSDEM: https://fosdem.org/2024/schedule/event/fosdem-2024-2262-exercising-qemu-generated-acpi-smbios-tables-using-biosbits-from-within-a-guest-vm-/
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*********************************
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*********************************
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Description of the test framework
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Description of the test framework
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@ -148,8 +153,3 @@ Under ``tests/functional/`` as the root we have:
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Author: Ani Sinha <anisinha@redhat.com>
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Author: Ani Sinha <anisinha@redhat.com>
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References:
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-----------
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.. [#a] https://blog.linuxplumbersconf.org/2011/ocw/system/presentations/867/original/bits.pdf
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.. [#b] https://www.youtube.com/watch?v=36QIepyUuhg
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.. [#c] https://fosdem.org/2024/schedule/event/fosdem-2024-2262-exercising-qemu-generated-acpi-smbios-tables-using-biosbits-from-within-a-guest-vm-/
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@ -9,11 +9,12 @@ The consumption is reported via MSRs (model specific registers) like
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MSR_PKG_ENERGY_STATUS for the CPU package power domain. These MSRs are 64 bits
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MSR_PKG_ENERGY_STATUS for the CPU package power domain. These MSRs are 64 bits
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registers that represent the accumulated energy consumption in micro Joules.
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registers that represent the accumulated energy consumption in micro Joules.
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Thanks to the MSR Filtering patch [#a]_ not all MSRs are handled by KVM. Some
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Thanks to KVM's `MSR filtering <msr-filter-patch_>`__ functionality,
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of them can now be handled by the userspace (QEMU). It uses a mechanism called
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not all MSRs are handled by KVM. Some of them can now be handled by the
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"MSR filtering" where a list of MSRs is given at init time of a VM to KVM so
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userspace (QEMU); a list of MSRs is given at VM creation time to KVM, and
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that a callback is put in place. The design of this patch uses only this
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a userspace exit occurs when they are accessed.
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mechanism for handling the MSRs between guest/host.
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.. _msr-filter-patch: https://patchwork.kernel.org/project/kvm/patch/20200916202951.23760-7-graf@amazon.com/
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At the moment the following MSRs are involved:
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At the moment the following MSRs are involved:
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@ -92,9 +93,12 @@ found by the sysconf system call. A typical value of clock ticks per second is
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package has 4 cores, 400 ticks maximum can be scheduled on all the cores
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package has 4 cores, 400 ticks maximum can be scheduled on all the cores
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of the package for a period of 1 second.
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of the package for a period of 1 second.
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The /proc/[pid]/stat [#b]_ is a sysfs file that can give the executed time of a
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`/proc/[pid]/stat <stat_>`__ is a procfs file that can give the executed
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process with the [pid] as the process ID. It gives the amount of ticks the
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time of a process with the [pid] as the process ID. It gives the amount
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process has been scheduled in userspace (utime) and kernel space (stime).
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of ticks the process has been scheduled in userspace (utime) and kernel
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space (stime).
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.. _stat: https://man7.org/linux/man-pages/man5/proc.5.html
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By reading those metrics for a thread, one can calculate the ratio of time the
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By reading those metrics for a thread, one can calculate the ratio of time the
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package has spent executing the thread.
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package has spent executing the thread.
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@ -148,8 +152,3 @@ Current Limitations
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- Only the Package Power-Plane (MSR_PKG_ENERGY_STATUS) is reported at the
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- Only the Package Power-Plane (MSR_PKG_ENERGY_STATUS) is reported at the
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moment.
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moment.
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References
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----------
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.. [#a] https://patchwork.kernel.org/project/kvm/patch/20200916202951.23760-7-graf@amazon.com/
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.. [#b] https://man7.org/linux/man-pages/man5/proc.5.html
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