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Re: [Qemu-devel] RFC: altering the NVDIMM acpi table
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] RFC: altering the NVDIMM acpi table |
Date: |
Tue, 24 Apr 2018 00:11:39 +0300 |
On Mon, Apr 23, 2018 at 08:35:45PM +0000, Schmauss, Erik wrote:
> Hello,
>
> I work on ACPICA and we have recently made changes to the behavior of
> the Linux AML interpreter to match other OS implementations. After
> sending the patches to upstream Linux, we have identified that
> hw/acpi/nvdimm.c specifies an ACPI table with a forward reference
> (MEMA is a forward reference that is no longer supported as of Linux
> 4.17-rc1).
>
> We would like to change this file to move the declaration of Name
> (MEMA,...) to appear as the very first declaration in the SSDT. Below is a
> patch outlining the change that I would like to make.
> However, I am having a hard time getting make check to run
> to completion in a reasonable amount of time. It always seems to fail
> on some sort of checksum test... It would be great if you could let me
> know what you think of the change and what I can do to speed up the
> execution time of make check...
>
>
> Thanks,
>
> Erik Schmauss
>
> diff --git a/hw/acpi/nvdimm.c b/hw/acpi/nvdimm.c
> index 59d6e4254c..7c9efd9ac7 100644
> --- a/hw/acpi/nvdimm.c
> +++ b/hw/acpi/nvdimm.c
> @@ -1234,6 +1234,9 @@ static void nvdimm_build_ssdt(GArray *table_offsets,
> GArray *table_data,
> ssdt = init_aml_allocator();
> acpi_data_push(ssdt->buf, sizeof(AcpiTableHeader));
>
> + mem_addr_offset = build_append_named_dword(table_data,
> + NVDIMM_ACPI_MEM_ADDR);
> +
> sb_scope = aml_scope("\\_SB");
Hmm I suspect this won't work because you are appending to
table_data, but the ssdt header isn't there yet - it's
in ssdt at this point.
Look at hw/acpi/vmgenid.c for how to do it right:
vgia_offset = table_data->len +
build_append_named_dword(ssdt->buf, "VGIA");
ugly, but works.
>
> dev = aml_device("NVDR");
> @@ -1266,9 +1269,6 @@ static void nvdimm_build_ssdt(GArray *table_offsets,
> GArray *table_data,
>
> /* copy AML table into ACPI tables blob and patch header there */
> g_array_append_vals(table_data, ssdt->buf->data, ssdt->buf->len);
> - mem_addr_offset = build_append_named_dword(table_data,
> - NVDIMM_ACPI_MEM_ADDR);
> -
> bios_linker_loader_alloc(linker,
> NVDIMM_DSM_MEM_FILE, dsm_dma_arrea,
> sizeof(NvdimmDsmIn), false /* high memory */);