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b1fdbe77be
- Disable AVIC on SNP-enabled systems that don't allow writes to the virtual APIC page, as such hosts will hit unexpected RMP #PFs in the host when running VMs of any flavor. - Fix a WARN in the hypercall completion path due to KVM trying to determine if a guest with protected register state is in 64-bit mode (KVM's ABI is to assume such guests only make hypercalls in 64-bit mode). - Allow the guest to write to supported bits in MSR_AMD64_DE_CFG to fix a regression with Windows guests, and because KVM's read-only behavior appears to be entirely made up. - Treat TDP MMU faults as spurious if the faulting access is allowed given the existing SPTE. This fixes a benign WARN (other than the WARN itself) due to unexpectedly replacing a writable SPTE with a read-only SPTE. - Emit a warning when KVM is configured with ignore_msrs=1 and also to hide the MSRs that the guest is looking for from the kernel logs. ignore_msrs can trick guests into assuming that certain processor features are present, and this in turn leads to bogus bug reports. -----BEGIN PGP SIGNATURE----- iQFIBAABCAAyFiEE8TM4V0tmI4mGbHaCv/vSX3jHroMFAmdoSTgUHHBib256aW5p QHJlZGhhdC5jb20ACgkQv/vSX3jHroM+IggAndK6byvsGjU0lM5v4WhKMnD7KZXi PsXuzv7LQUtbOaosowbBDUfMkZXwewmgUjBWmJL8WFlVePk7+8Aj29Zwd4vH3cHI KZ/AeyC6VwH1CFLZMSoHgG2dCl8hUUkUldZLAdYKigTRMlw5FmnmIfhqx/mpxiMz xHs9TU+NZpaQVXSzq9P1AXkJX+zZvyYlGXrTRtJ541AwYPWsq1MBr1megtBi59ws zEgCOyBpDHWQEasbtwHjPNNH+rCi8SEq2QCrSGHpTXWLS9kXj32wLldWb6E3L5ta c1/Q9mQDpVXQNidnAWyhukVmbETQDkpB+j9Mfd+bwIy1+zh6iSEe9dWM9g== =/fW+ -----END PGP SIGNATURE----- Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm Pull KVM x86 fixes from Paolo Bonzini: - Disable AVIC on SNP-enabled systems that don't allow writes to the virtual APIC page, as such hosts will hit unexpected RMP #PFs in the host when running VMs of any flavor. - Fix a WARN in the hypercall completion path due to KVM trying to determine if a guest with protected register state is in 64-bit mode (KVM's ABI is to assume such guests only make hypercalls in 64-bit mode). - Allow the guest to write to supported bits in MSR_AMD64_DE_CFG to fix a regression with Windows guests, and because KVM's read-only behavior appears to be entirely made up. - Treat TDP MMU faults as spurious if the faulting access is allowed given the existing SPTE. This fixes a benign WARN (other than the WARN itself) due to unexpectedly replacing a writable SPTE with a read-only SPTE. - Emit a warning when KVM is configured with ignore_msrs=1 and also to hide the MSRs that the guest is looking for from the kernel logs. ignore_msrs can trick guests into assuming that certain processor features are present, and this in turn leads to bogus bug reports. * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: KVM: x86: let it be known that ignore_msrs is a bad idea KVM: VMX: don't include '<linux/find.h>' directly KVM: x86/mmu: Treat TDP MMU faults as spurious if access is already allowed KVM: SVM: Allow guest writes to set MSR_AMD64_DE_CFG bits KVM: x86: Play nice with protected guests in complete_hypercall_exit() KVM: SVM: Disable AVIC on SNP-enabled system without HvInUseWrAllowed feature |
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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 reStructuredText 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.