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nvdimm: add 'unarmed' option

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Currently the only vNVDIMM backend can guarantee the guest write
persistence is device DAX on Linux, because no host-side kernel cache
is involved in the guest access to it. The approach to detect whether
the backend is device DAX needs to access sysfs, which may not work
with SELinux.

Instead, we add the 'unarmed' option to device 'nvdimm', so that users
or management utils, which have enough knowledge about the backend,
can control the unarmed flag in guest ACPI NFIT via this option. The
guest Linux NVDIMM driver, for example, will mark the corresponding
vNVDIMM device read-only if the unarmed flag in guest NFIT is set.

The default value of 'unarmed' option is 'off' in order to keep the
backwards compatibility.

Signed-off-by: Haozhong Zhang <haozhong.zhang@intel.com>
Message-Id: <20171211072806.2812-4-haozhong.zhang@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Haozhong Zhang 2017-12-11 15:28:06 +08:00 • committed by Eduardo Habkost
parent da6789c27c
commit cb836434cd
4 changed files with 57 additions and 0 deletions
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7
hw/acpi/nvdimm.c
View file

@ -138,6 +138,8 @@ struct NvdimmNfitMemDev {
} QEMU_PACKED;
typedef struct NvdimmNfitMemDev NvdimmNfitMemDev;
#define ACPI_NFIT_MEM_NOT_ARMED (1 << 3)
/*
* NVDIMM Control Region Structure
*
@ -284,6 +286,7 @@ static void
nvdimm_build_structure_memdev(GArray *structures, DeviceState *dev)
{
NvdimmNfitMemDev *nfit_memdev;
NVDIMMDevice *nvdimm = NVDIMM(OBJECT(dev));
uint64_t size = object_property_get_uint(OBJECT(dev), PC_DIMM_SIZE_PROP,
NULL);
int slot = object_property_get_int(OBJECT(dev), PC_DIMM_SLOT_PROP,
@ -312,6 +315,10 @@ nvdimm_build_structure_memdev(GArray *structures, DeviceState *dev)
/* Only one interleave for PMEM. */
nfit_memdev->interleave_ways = cpu_to_le16(1);
if (nvdimm->unarmed) {
nfit_memdev->flags |= cpu_to_le16(ACPI_NFIT_MEM_NOT_ARMED);
}
}
/*