[PATCH 0/3] KVM: Fix for a mostly benign gpc WARN

[Sean Christopherson <seanjc@google.com>]

Fix a bug found by syzkaller, thanks to a new WARN sanity check, where KVM
marks a gfn_to_pfn_cache as active without actually setting gpc->gpa or any
other metadata.  On top, harden against _directly_ setting gpc->gpa to KVM's
magic INVALID_GPA, which would also fail the sanity check.

Sean Christopherson (3):
  KVM: Add helpers to consolidate gfn_to_pfn_cache's page split check
  KVM: Check validity of offset+length of gfn_to_pfn_cache prior to
    activation
  KVM: Explicitly disallow activatating a gfn_to_pfn_cache with
    INVALID_GPA

Sean Christopherson (3):
  KVM: Add helpers to consolidate gfn_to_pfn_cache's page split check
  KVM: Check validity of offset+length of gfn_to_pfn_cache prior to
    activation
  KVM: Explicitly disallow activatating a gfn_to_pfn_cache with
    INVALID_GPA

 virt/kvm/pfncache.c | 48 ++++++++++++++++++++++++++++++++-------------
 1 file changed, 34 insertions(+), 14 deletions(-)


base-commit: 964d0c614c7f71917305a5afdca9178fe8231434
-- 
2.44.0.291.gc1ea87d7ee-goog