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KVM fixes for 7.3-rcN

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- Fix a brown paper bag bug where KVM would incorrectly treat Intel PMU MSRs
    as valid on AMD.
 
  - Fix a regression in the hardware disable selftest where it checked the wrong
    macro when detecting glibc support (breaks at least musl).
 
  - Never clear KVM_REQ_VM_DEAD so that dead VMs stay dead, which is especially
    important for KVM_BUG_ON() flows, which often guard more dangerous bugs.
 
  - Re-pend GET_NESTED_STATE_PAGES if getting the pages fails, to fix a bug
    where KVM would let userspace run a broken setup with stale vmcs12 pages.
 
  - Fix a class of bugs where KVM would fail to fill kvm_run exit fields if
    getting nested pages failed.
 
  - Treat reserved entries in the memory attributes xarray as "no attributes",
    to fix false positives when checking for mixed attributes.
 
  - Fix memcg accounting for the memory attributes xarray (the xarray library
    subtly requires the xarray to be configured for accounting upfront; the gfp
    flags taken at runtime are used only rarely).
 
  - Don't pre-reserve xarray entries when storing empty attributes, as storing
    NULL must not require memory allocation (KVM and other subsystems heavily
    rely on this behavior).
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Merge tag 'kvm-x86-fixes-7.3-rc5' of https://github.com/kvm-x86/linux into HEAD

KVM fixes for 7.3-rcN

 - Fix a brown paper bag bug where KVM would incorrectly treat Intel PMU MSRs
   as valid on AMD.

 - Fix a regression in the hardware disable selftest where it checked the wrong
   macro when detecting glibc support (breaks at least musl).

 - Never clear KVM_REQ_VM_DEAD so that dead VMs stay dead, which is especially
   important for KVM_BUG_ON() flows, which often guard more dangerous bugs.

 - Re-pend GET_NESTED_STATE_PAGES if getting the pages fails, to fix a bug
   where KVM would let userspace run a broken setup with stale vmcs12 pages.

 - Fix a class of bugs where KVM would fail to fill kvm_run exit fields if
   getting nested pages failed.

 - Treat reserved entries in the memory attributes xarray as "no attributes",
   to fix false positives when checking for mixed attributes.

 - Fix memcg accounting for the memory attributes xarray (the xarray library
   subtly requires the xarray to be configured for accounting upfront; the gfp
   flags taken at runtime are used only rarely).

 - Don't pre-reserve xarray entries when storing empty attributes, as storing
   NULL must not require memory allocation (KVM and other subsystems heavily
   rely on this behavior).
This commit is contained in:
Paolo Bonzini 2026-09-26 00:40:07 -04:00
commit c2f24f140c
11 changed files with 56 additions and 39 deletions
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