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xen/CHANGELOG.md
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Roger Pau Monné f6cd15188e amd/msr: implement VIRT_SPEC_CTRL for HVM guests using legacy SSBD 
Expose VIRT_SSBD to guests if the hardware supports setting SSBD in
the LS_CFG MSR (a.k.a. non-architectural way). Different AMD CPU
families use different bits in LS_CFG, so exposing VIRT_SPEC_CTRL.SSBD
allows for an unified way of exposing SSBD support to guests on AMD
hardware that's compatible migration wise, regardless of what
underlying mechanism is used to set SSBD.

Note that on AMD Family 17h and Hygon Family 18h processors the value
of SSBD in LS_CFG is shared between threads on the same core, so
there's extra logic in order to synchronize the value and have SSBD
set as long as one of the threads in the core requires it to be set.
Such logic also requires extra storage for each thread state, which is
allocated at initialization time.

Do the context switching of the SSBD selection in LS_CFG between
hypervisor and guest in the same handler that's already used to switch
the value of VIRT_SPEC_CTRL.

Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Henry Wang <Henry.Wang@arm.com>

Re-commited with a tag removed.

Signed-off-by: George Dunlap <george.dunlap@citrix.com>
2022-08-19 20:23:43 +01:00

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# Changelog
Notable changes to Xen will be documented in this file.
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
## [unstable UNRELEASED](https://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=staging) - TBD
### Changed
- On x86 "vga=current" can now be used together with GrUB2's gfxpayload setting. Note that
this requires use of "multiboot2" (and "module2") as the GrUB commands loading Xen.
### Added / support upgraded
- IOMMU superpage support on x86, affecting PV guests as well as HVM/PVH ones
when they don't share page tables with the CPU (HAP / EPT / NPT).
- Support VIRT_SSBD feature for HVM guests on AMD.
### Removed / support downgraded
- dropped support for the (x86-only) "vesa-mtrr" and "vesa-remap" command line options
## [4.16.0](https://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=staging) - 2021-12-02
### Removed
- XENSTORED_ROOTDIR environment variable from configuartion files and
initscripts, due to being unused.
### Changed
- Quarantining of passed-through PCI devices no longer defaults to directing I/O to a scratch
page, matching original post-XSA-302 behavior (albeit the change was also backported, first
appearing in 4.12.2 and 4.11.4). Prior (4.13...4.15-like) behavior can be arranged for
either by enabling the IOMMU_QUARANTINE_SCRATCH_PAGE setting at build (configuration) time
or by passing "iommu=quarantine=scratch-page" on the hypervisor command line.
- pv-grub stubdoms will no longer be built per default. In order to be able to use pv-grub
configure needs to be called with "--enable-pv-grub" as parameter.
- qemu-traditional based device models (both, qemu-traditional and ioemu-stubdom) will
no longer be built per default. In order to be able to use those, configure needs to
be called with "--enable-qemu-traditional" as parameter.
- Fixes for credit2 scheduler stability in corner case conditions.
- Ongoing improvements in the hypervisor build system.
- vtpmmgr miscellaneous fixes in preparation for TPM 2.0 support.
- 32bit PV guests only supported in shim mode.
- Improved PVH dom0 debug key handling.
- Fix booting on some Intel systems without a PIT (i8254).
- Cleanup of the xenstore library interface.
- Fix truncation of return value from xencall2 by introducing a new helper
that returns a long instead.
- Fix system register accesses on Arm to use the proper 32/64bit access size.
- Various fixes for Arm OP-TEE mediator.
- Switch to domheap for Xen page tables.
### Added
- 32bit Arm builds to the gitlab-ci automated tests.
- x86 full system tests to the gitlab-ci automated tests.
- Arm limited vPMU support for guests.
- Static physical memory allocation for dom0less on arm64.
- dom0less EFI support on arm64.
- GICD_ICPENDR register handling in vGIC emulation to support Zephyr OS.
- CPU feature leveling on arm64 platform with heterogeneous cores.
- Report unpopulated memory regions safe to use for external mappings, Arm and
device tree only.
- Support of generic DT IOMMU bindings for Arm SMMU v2.
- Limit grant table version on a per-domain basis.
## [4.15.0](https://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=RELEASE-4.15.0) - 2021-04-08
### Added / support upgraded
- ARM IOREQ servers (device emulation etc.) (Tech Preview)
- Renesas IPMMU-VMSA (Supported, not security supported; was Tech Preview)
- ARM SMMUv3 (Tech Preview)
- Switched MSR accesses to deny by default policy.
- Intel Processor Trace support (Tech Preview)
- Named PCI devices for xl/libxl
- Improved documentation for xl PCI configuration format
- Support for zstd-compressed dom0 (x86) and domU kernels
- EFI: Enable booting unified hypervisor/kernel/initrd/DT images
- Reduce ACPI verbosity by default
- Add ucode=allow-same option to test late microcode loading path
- Library improvements from NetBSD ports upstreamed
- CI loop: Add Alpine Linux, Ubuntu Focal targets; drop CentOS 6
- CI loop: Add qemu-based dom0 / domU test for ARM
- CI loop: Add dom0less aarch64 smoke test
- x86: Allow domains to use AVX-VNNI instructions
- Factored out HVM-specific shadow code, improving code clarity and reducing the size of PV-only hypervisor builds
- Added XEN_SCRIPT_DIR configuration option to specify location for Xen scripts, rather than hard-coding /etc/xen/scripts
- xennet: Documented a way for the backend (or toolstack) to specify MTU to the frontend
- xenstore can now be live-updated on a running system. (Tech preview)
- Some additional affordances in various xl subcommands.
- Added workarounds for the following ARM errata: Cortex A53 #843419, Cortex A55 #1530923, Cortex A72 #853709, Cortex A73 #858921, Cortex A76 #1286807, Neoverse-N1 #1165522
- On detecting a host crash, some debug key handlers can automatically triggered to aid in debugging
- Increase the maximum number of guests which can share a single IRQ from 7 to 16, and make this configurable with irq-max-guests
### Removed / support downgraded
- qemu-xen-traditional as host process device model, now "No security
support, not recommended". (Use as stub domain device model is still
supported - see SUPPORT.md.)
## [4.14.0](https://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=RELEASE-4.14.0) - 2020-07-23
### Added
- This file and MAINTAINERS entry.
- Use x2APIC mode whenever available, regardless of interrupt remapping
support.
- Performance improvements to guest assisted TLB flushes, either when using
the Xen hypercall interface or the viridian one.
- Assorted pvshim performance and scalability improvements plus some bug
fixes.
- Hypervisor framework to ease porting Xen to run on hypervisors.
- Initial support to run on Hyper-V.
- Initial hypervisor file system (hypfs) support.
- libxl support for running qemu-xen device model in a linux stubdomain.
- New 'domid_policy', allowing domain-ids to be randomly chosen.
- Option to preserve domain-id across migrate or save+restore.
- Support in kdd for initial KD protocol handshake for Win 7, 8 and 10 (64 bit).
- Tech preview support for Control-flow Execution Technology, with Xen using
Supervisor Shadow Stacks for its own protection.
### Changed
- The CPUID data seen by a guest on boot is now moved in the migration
stream. A guest migrating between non-identical hardware will now no
longer observe details such as Family/Model/Stepping, Cache, etc changing.
An administrator still needs to take care to ensure the features visible to
the guest at boot are compatible with anywhere it might migrate.
## [4.13.0](https://xenbits.xen.org/gitweb/?p=xen.git;a=shortlog;h=RELEASE-4.13.0) - 2019-12-17
> Pointer to release from which CHANGELOG tracking starts
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