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KVM: PPC: Book3S HV: Disable page merging in H_SVM_INIT_START

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Page-merging of pages in memory-slots associated with a Secure VM
is disabled in H_SVM_PAGE_IN handler.

This operation should have been done the much earlier; the moment the VM
is initiated for secure-transition. Delaying this operation increases
the probability for those pages to acquire new references, making it
impossible to migrate those pages in H_SVM_PAGE_IN handler.

Disable page-migration in H_SVM_INIT_START handling.

Reviewed-by: Bharata B Rao <bharata@linux.ibm.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
This commit is contained in:
Ram Pai
2020-07-27 11:07:15 -07:00
committed by Paul Mackerras
parent 48908a3833
commit 2027a24a75
2 changed files with 89 additions and 35 deletions
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Documentation/powerpc/ultravisor.rst
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@@ -895,6 +895,7 @@ Return values
One of the following values:
* H_SUCCESS on success.
* H_STATE if the VM is not in a position to switch to secure.
Description
~~~~~~~~~~~