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c7313155bf
Kill off pdptrs_changed() and instead go through the full kvm_set_cr3() for PAE guest, even if the new CR3 is the same as the current CR3. For VMX, and SVM with NPT enabled, the PDPTRs are unconditionally marked as unavailable after VM-Exit, i.e. the optimization is dead code except for SVM without NPT. In the unlikely scenario that anyone cares about SVM without NPT _and_ a PAE guest, they've got bigger problems if their guest is loading the same CR3 so frequently that the performance of kvm_set_cr3() is notable, especially since KVM's fast PGD switching means reloading the same CR3 does not require a full rebuild. Given that PAE and PCID are mutually exclusive, i.e. a sync and flush are guaranteed in any case, the actual benefits of the pdptrs_changed() optimization are marginal at best. Signed-off-by: Sean Christopherson <seanjc@google.com> Message-Id: <20210607090203.133058-4-mlevitsk@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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| fs | ||
| include | ||
| init | ||
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| kernel | ||
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| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
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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.