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3ecf162a31
- Don't write to the Xen hypercall page on MSR writes that are initiated by
the host (userspace or KVM) to fix a class of bugs where KVM can write to
guest memory at unexpected times, e.g. during vCPU creation if userspace has
set the Xen hypercall MSR index to collide with an MSR that KVM emulates.
- Restrict the Xen hypercall MSR indx to the unofficial synthetic range to
reduce the set of possible collisions with MSRs that are emulated by KVM
(collisions can still happen as KVM emulates Hyper-V MSRs, which also reside
in the synthetic range).
- Clean up and optimize KVM's handling of Xen MSR writes and xen_hvm_config.
- Update Xen TSC leaves during CPUID emulation instead of modifying the CPUID
entries when updating PV clocks, as there is no guarantee PV clocks will be
updated between TSC frequency changes and CPUID emulation, and guest reads
of Xen TSC should be rare, i.e. are not a hot path.
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Merge tag 'kvm-x86-xen-6.15' of https://github.com/kvm-x86/linux into HEAD
KVM Xen changes for 6.15
- Don't write to the Xen hypercall page on MSR writes that are initiated by
the host (userspace or KVM) to fix a class of bugs where KVM can write to
guest memory at unexpected times, e.g. during vCPU creation if userspace has
set the Xen hypercall MSR index to collide with an MSR that KVM emulates.
- Restrict the Xen hypercall MSR indx to the unofficial synthetic range to
reduce the set of possible collisions with MSRs that are emulated by KVM
(collisions can still happen as KVM emulates Hyper-V MSRs, which also reside
in the synthetic range).
- Clean up and optimize KVM's handling of Xen MSR writes and xen_hvm_config.
- Update Xen TSC leaves during CPUID emulation instead of modifying the CPUID
entries when updating PV clocks, as there is no guarantee PV clocks will be
updated between TSC frequency changes and CPUID emulation, and guest reads
of Xen TSC should be rare, i.e. are not a hot path.
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| .. | ||
| acrn | ||
| coco | ||
| hyperv | ||
| kvm | ||
| uml | ||
| guest-halt-polling.rst | ||
| index.rst | ||
| ne_overview.rst | ||
| paravirt_ops.rst | ||