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acpi nvdimm: fix wrong buffer size returned by DSM method 

Currently, 'RLEN' is the totally buffer size written by QEMU and it is
ACPI internally used only. The buffer size returned to guest should
not include 'RLEN' itself

Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Xiao Guangrong 2016-10-29 00:11:49 +08:00 committed by Michael S. Tsirkin
parent 6034011c7e
commit d51d1d7ede
1 changed files with 2 additions and 1 deletions
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3
hw/acpi/nvdimm.c
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@ -862,7 +862,8 @@ static void nvdimm_build_common_dsm(Aml *dev)
aml_append(method, aml_store(dsm_mem, aml_name("NTFI")));
result_size = aml_local(1);
aml_append(method, aml_store(aml_name("RLEN"), result_size));
/* RLEN is not included in the payload returned to guest. */
aml_append(method, aml_subtract(aml_name("RLEN"), aml_int(4), result_size));
aml_append(method, aml_store(aml_shiftleft(result_size, aml_int(3)),
result_size));
aml_append(method, aml_create_field(aml_name("ODAT"), aml_int(0),