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Re: [Qemu-ppc] [PATCH v2 11/12] nvdimm: make get_memory_region() perform
From: |
Igor Mammedov |
Subject: |
Re: [Qemu-ppc] [PATCH v2 11/12] nvdimm: make get_memory_region() perform checks and initialization |
Date: |
Fri, 15 Jun 2018 15:14:38 +0200 |
On Fri, 15 Jun 2018 13:24:59 +0200
David Hildenbrand <address@hidden> wrote:
> We might get a call to get_memory_region() before the device has been
> realized. We should return a consistent value, as the return value
> will e.g. later on be used in the pre_plug handler.
>
> To avoid duplicating too much code, factor the initialization and checks
> out into a helper function.
>
> Signed-off-by: David Hildenbrand <address@hidden>
> ---
> hw/mem/nvdimm.c | 49 ++++++++++++++++++++++++++++++++++++++-----------
> 1 file changed, 38 insertions(+), 11 deletions(-)
>
> diff --git a/hw/mem/nvdimm.c b/hw/mem/nvdimm.c
> index d3e8a5bcbb..9048ce0b84 100644
> --- a/hw/mem/nvdimm.c
> +++ b/hw/mem/nvdimm.c
> @@ -27,20 +27,19 @@
> #include "qapi/visitor.h"
> #include "hw/mem/nvdimm.h"
>
> -static MemoryRegion *nvdimm_get_memory_region(PCDIMMDevice *dimm, Error
> **errp)
> +static void nvdimm_prepare_memory_region(NVDIMMDevice *nvdimm, Error **errp)
> {
> - NVDIMMDevice *nvdimm = NVDIMM(dimm);
> -
> - return &nvdimm->nvdimm_mr;
> -}
> + PCDIMMDevice *dimm = PC_DIMM(nvdimm);
> + uint64_t align, pmem_size, size;
> + MemoryRegion *mr;
>
> -static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp)
> -{
> - MemoryRegion *mr = host_memory_backend_get_memory(dimm->hostmem);
> - NVDIMMDevice *nvdimm = NVDIMM(dimm);
> - uint64_t align, pmem_size, size = memory_region_size(mr);
> + if (!dimm->hostmem) {
> + error_setg(errp, "'" PC_DIMM_MEMDEV_PROP "' property must be set");
> + return;
> + }
>
> - align = memory_region_get_alignment(mr);
> + g_assert(!memory_region_size(&nvdimm->nvdimm_mr));
> + mr = host_memory_backend_get_memory(dimm->hostmem);
>
> if (nvdimm->label_size && nvdimm->label_size < MIN_NAMESPACE_LABEL_SIZE)
> {
> error_setg(errp, "the label-size (0x%" PRIx64 ") has to be "
> @@ -49,6 +48,9 @@ static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp)
> return;
> }
>
> + align = memory_region_get_alignment(mr);
> + size = memory_region_size(mr);
> +
> pmem_size = size - nvdimm->label_size;
> nvdimm->label_data = memory_region_get_ram_ptr(mr) + pmem_size;
> pmem_size = QEMU_ALIGN_DOWN(pmem_size, align);
> @@ -70,6 +72,31 @@ static void nvdimm_realize(PCDIMMDevice *dimm, Error
> **errp)
> nvdimm->nvdimm_mr.align = align;
> }
>
> +static MemoryRegion *nvdimm_get_memory_region(PCDIMMDevice *dimm, Error
> **errp)
> +{
> + NVDIMMDevice *nvdimm = NVDIMM(dimm);
> + Error *local_err = NULL;
> +
> + if (!memory_region_size(&nvdimm->nvdimm_mr)) {
ditto as in 10/12, this check works by accident (because memory is zero
initialized,
hence memory_region_size() returns 0) and not by design.
one way to fix it, could be to make nvdimm->nvdimm_mr a pointer and dynamically
allocate it and use NULL check to see if it's initialized.
one would need to add finalize to free it on nvdimm destruction though.
> + nvdimm_prepare_memory_region(nvdimm, &local_err);
> + }
> +
> + if (local_err) {
> + error_propagate(errp, local_err);
> + return NULL;
> + }
> + return &nvdimm->nvdimm_mr;
> +}
> +
> +static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp)
> +{
> + NVDIMMDevice *nvdimm = NVDIMM(dimm);
> +
> + if (!memory_region_size(&nvdimm->nvdimm_mr)) {
ditto
> + nvdimm_prepare_memory_region(nvdimm, errp);
> + }
> +}
> +
> /*
> * the caller should check the input parameters before calling
> * label read/write functions.