linux

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Sean Christopherson 16c6a078c2 KVM: x86/mmu: Fully re-evaluate MMIO caching when SPTE masks change

commit c3e0c8c2e8b17bae30d5978bc2decdd4098f0f99 upstream.

Fully re-evaluate whether or not MMIO caching can be enabled when SPTE
masks change; simply clearing enable_mmio_caching when a configuration
isn't compatible with caching fails to handle the scenario where the
masks are updated, e.g. by VMX for EPT or by SVM to account for the C-bit
location, and toggle compatibility from false=>true.

Snapshot the original module param so that re-evaluating MMIO caching
preserves userspace's desire to allow caching.  Use a snapshot approach
so that enable_mmio_caching still reflects KVM's actual behavior.

Fixes: 8b9e74bfbf8c ("KVM: x86/mmu: Use enable_mmio_caching to track if MMIO caching is enabled")
Reported-by: Michael Roth <michael.roth@amd.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: stable@vger.kernel.org
Tested-by: Michael Roth <michael.roth@amd.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Message-Id: <20220803224957.1285926-3-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2022-08-17 15:13:45 +02:00

alpha

Cleanups (and one fix) around struct mount handling.

2022-06-04 19:00:05 -07:00

arc

This set of changes updates init and user mode helper tasks to be

2022-06-03 16:03:05 -07:00

arm

ARM fixes for 5.19:

2022-07-30 17:24:16 -07:00

arm64

arm64: set UXN on swapper page tables