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| Filename | Latest commit message | Latest commit date |
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0718e2d3dc
commit f958bd2314d117f8c29f4821401bc1925bc2e5ef upstream. Unlike most state managed by XSAVE, MPX is initialized to zero on INIT. Because INITs are usually recognized in the context of a VCPU_RUN call, kvm_vcpu_reset() puts the guest's FPU so that the FPU state is resident in memory, zeros the MPX state, and reloads FPU state to hardware. But, in the unlikely event that an INIT is recognized during kvm_arch_vcpu_ioctl_get_mpstate() via kvm_apic_accept_events(), kvm_vcpu_reset() will call kvm_put_guest_fpu() without a preceding kvm_load_guest_fpu() and corrupt the guest's FPU state (and possibly userspace's FPU state as well). Given that MPX is being removed from the kernel[*], fix the bug with the simple-but-ugly approach of loading the guest's FPU during KVM_GET_MP_STATE. [*] See commit |
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.