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BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3275 The PVALIDATE instruction validates or rescinds validation of a guest page RMP entry. Upon completion, a return code is stored in EAX, rFLAGS bits OF, ZF, AF, PF and SF are set based on this return code. If the instruction completed succesfully, the rFLAGS bit CF indicates if the contents of the RMP entry were changed or not. For more information about the instruction see AMD APM volume 3. Cc: James Bottomley <jejb@linux.ibm.com> Cc: Min Xu <min.m.xu@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Erdem Aktas <erdemaktas@google.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Liming Gao <gaoliming@byosoft.com.cn> Cc: Zhiguang Liu <zhiguang.liu@intel.com> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Message-Id: <20210519181949.6574-8-brijesh.singh@amd.com>