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authorRam Pai <linuxram@us.ibm.com>2020-07-27 21:07:15 +0300
committerPaul Mackerras <paulus@ozlabs.org>2020-07-28 05:34:52 +0300
commit2027a24a75ce32cf48a22cc25a9d87b8c5b19328 (patch)
treed9fd20bd150c3e4cc05fb581b4792bee2e92d78a /Documentation/powerpc/ultravisor.rst
parent48908a3833cc76c56e626e8e80ba8f808c8d03a5 (diff)
downloadlinux-2027a24a75ce32cf48a22cc25a9d87b8c5b19328.tar.xz
KVM: PPC: Book3S HV: Disable page merging in H_SVM_INIT_START
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>
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diff --git a/Documentation/powerpc/ultravisor.rst b/Documentation/powerpc/ultravisor.rst
index df136c8f91fa..a1c8c37159a1 100644
--- a/Documentation/powerpc/ultravisor.rst
+++ b/Documentation/powerpc/ultravisor.rst
@@ -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
~~~~~~~~~~~