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Re: [PATCH 2/2] NVDIMM: Init vNVDIMM's LSA index block if it hasn't been
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From: |
Igor Mammedov |
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Subject: |
Re: [PATCH 2/2] NVDIMM: Init vNVDIMM's LSA index block if it hasn't been |
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Date: |
Thu, 31 Mar 2022 14:09:38 +0200 |
On Tue, 29 Mar 2022 15:07:43 +0800
Robert Hoo <robert.hu@linux.intel.com> wrote:
> Since v2.7, QEMU has supported the emulation of NVDIMM's labels.
> With -device nvdimm,...,lsa-size=, the vNVDIMM to guest has this
> capability. But if the emulated LSA area isn't initialized, guest Kernel
> can't enumerate it correctly.
>
> This patch is to initialize/format the vNVDIMM's LSA, if it has been
> designated the Label capability. The index block format will be v1.1
> initially, in order to obtain maximum compatibility. VM user can later
> `ndctl init-label` to make it v1.2 if necessary. [1]
Can user initialize/format LSA from guest using ndctl/some other tool?
> [1] https://uefi.org/sites/default/files/resources/ACPI_Spec_6_4_Jan22.pdf,
> Initial Label Storage Area Configuration:
> "for Label Storage Areas of 128KB and 256KB, the corresponding Index
> Block size is 256 or 512 bytes."
Quick search in above spec says such text doesn't exists.
above needs grep-able reference + chapter "x.x name" so one could easily
find it.
> In driver and ndctl code, they refer to these 2 cases as v1.1 and v1.2.
>
> Signed-off-by: Robert Hoo <robert.hu@linux.intel.com>
> Reviewed-by: Liu, Jingqi <jingqi.liu@intel.com>
> ---
> Note: most functions in this patch are ported from ndctl and nvdimm driver
> code.
> ---
> hw/mem/nvdimm.c | 359 ++++++++++++++++++++++++++++++++++++++++
> include/hw/mem/nvdimm.h | 104 ++++++++++++
> 2 files changed, 463 insertions(+)
>
> diff --git a/hw/mem/nvdimm.c b/hw/mem/nvdimm.c
> index 72cd3041ef..cae7f280d2 100644
> --- a/hw/mem/nvdimm.c
> +++ b/hw/mem/nvdimm.c
> @@ -25,6 +25,9 @@
> #include "qemu/osdep.h"
> #include "qemu/module.h"
> #include "qemu/pmem.h"
> +#include "qemu/cutils.h"
> +#include "qemu/bswap.h"
> +#include "qemu/error-report.h"
> #include "qapi/error.h"
> #include "qapi/visitor.h"
> #include "hw/mem/nvdimm.h"
> @@ -178,6 +181,348 @@ static MemoryRegion
> *nvdimm_md_get_memory_region(MemoryDeviceState *md,
> return nvdimm->nvdimm_mr;
> }
>
> +static const char NSINDEX_SIGNATURE[] = "NAMESPACE_INDEX\0";
> +
> +static unsigned inc_seq(unsigned seq)
> +{
> + static const unsigned next[] = { 0, 2, 3, 1 };
> +
> + return next[seq & 3];
> +}
> +
> +static u32 best_seq(u32 a, u32 b)
> +{
> + a &= NSINDEX_SEQ_MASK;
> + b &= NSINDEX_SEQ_MASK;
> +
> + if (a == 0 || a == b) {
> + return b;
> + } else if (b == 0) {
> + return a;
> + } else if (inc_seq(a) == b) {
> + return b;
> + } else {
> + return a;
> + }
> +}
> +
> +static size_t __sizeof_namespace_index(u32 nslot)
> +{
> + return ALIGN(sizeof(struct namespace_index) + DIV_ROUND_UP(nslot, 8),
> + NSINDEX_ALIGN);
> +}
> +
> +static unsigned sizeof_namespace_label(struct NVDIMMDevice *nvdimm)
> +{
> + if (nvdimm->label_size == 0) {
> + warn_report("NVDIMM label size is 0, default it to 128.");
> + nvdimm->label_size = 128;
> + }
> + return nvdimm->label_size;
> +}
> +
> +static int __nvdimm_num_label_slots(struct NVDIMMDevice *nvdimm,
> + size_t index_size)
> +{
> + return (nvdimm->lsa_size - index_size * 2) /
> + sizeof_namespace_label(nvdimm);
> +}
> +
> +static int nvdimm_num_label_slots(struct NVDIMMDevice *nvdimm)
> +{
> + u32 tmp_nslot, n;
> +
> + tmp_nslot = nvdimm->lsa_size / nvdimm->label_size;
> + n = __sizeof_namespace_index(tmp_nslot) / NSINDEX_ALIGN;
> +
> + return __nvdimm_num_label_slots(nvdimm, NSINDEX_ALIGN * n);
> +}
> +
> +static unsigned int sizeof_namespace_index(struct NVDIMMDevice *nvdimm)
> +{
> + u32 nslot, space, size;
> +
> + /*
> + * Per UEFI 2.7, the minimum size of the Label Storage Area is
> + * large enough to hold 2 index blocks and 2 labels. The
> + * minimum index block size is 256 bytes, and the minimum label
> + * size is 256 bytes.
> + */
> + nslot = nvdimm_num_label_slots(nvdimm);
> + space = nvdimm->lsa_size - nslot * sizeof_namespace_label(nvdimm);
> + size = __sizeof_namespace_index(nslot) * 2;
> + if (size <= space && nslot >= 2) {
> + return size / 2;
> + }
> +
> + error_report("label area (%ld) too small to host (%d byte) labels",
> + nvdimm->lsa_size, sizeof_namespace_label(nvdimm));
> + return 0;
> +}
> +
> +static struct namespace_index *to_namespace_index(struct NVDIMMDevice
> *nvdimm,
> + int i)
> +{
> + if (i < 0) {
> + return NULL;
> + }
> +
> + return nvdimm->label_data + sizeof_namespace_index(nvdimm) * i;
> +}
> +
> +/* Validate NVDIMM index blocks. Generally refer to driver and ndctl code */
> +static int __nvdimm_label_validate(struct NVDIMMDevice *nvdimm)
> +{
> + /*
> + * On media label format consists of two index blocks followed
> + * by an array of labels. None of these structures are ever
> + * updated in place. A sequence number tracks the current
> + * active index and the next one to write, while labels are
> + * written to free slots.
> + *
> + * +------------+
> + * | |
> + * | nsindex0 |
> + * | |
> + * +------------+
> + * | |
> + * | nsindex1 |
> + * | |
> + * +------------+
> + * | label0 |
> + * +------------+
> + * | label1 |
> + * +------------+
> + * | |
> + * ....nslot...
> + * | |
> + * +------------+
> + * | labelN |
> + * +------------+
> + */
> + struct namespace_index *nsindex[] = {
> + to_namespace_index(nvdimm, 0),
> + to_namespace_index(nvdimm, 1),
> + };
> + const int num_index = ARRAY_SIZE(nsindex);
> + bool valid[2] = { 0 };
> + int i, num_valid = 0;
> + u32 seq;
> +
> + for (i = 0; i < num_index; i++) {
> + u32 nslot;
> + u8 sig[NSINDEX_SIG_LEN];
> + u64 sum_save, sum, size;
> + unsigned int version, labelsize;
> +
> + memcpy(sig, nsindex[i]->sig, NSINDEX_SIG_LEN);
> + if (memcmp(sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN) != 0) {
> + nvdimm_debug("nsindex%d signature invalid\n", i);
> + continue;
> + }
> +
> + /* label sizes larger than 128 arrived with v1.2 */
> + version = le16_to_cpu(nsindex[i]->major) * 100
> + + le16_to_cpu(nsindex[i]->minor);
> + if (version >= 102) {
> + labelsize = 1 << (7 + nsindex[i]->labelsize);
> + } else {
> + labelsize = 128;
> + }
> +
> + if (labelsize != sizeof_namespace_label(nvdimm)) {
> + nvdimm_debug("nsindex%d labelsize %d invalid\n",
> + i, nsindex[i]->labelsize);
> + continue;
> + }
> +
> + sum_save = le64_to_cpu(nsindex[i]->checksum);
> + nsindex[i]->checksum = cpu_to_le64(0);
> + sum = fletcher64(nsindex[i], sizeof_namespace_index(nvdimm), 1);
> + nsindex[i]->checksum = cpu_to_le64(sum_save);
> + if (sum != sum_save) {
> + nvdimm_debug("nsindex%d checksum invalid\n", i);
> + continue;
> + }
> +
> + seq = le32_to_cpu(nsindex[i]->seq);
> + if ((seq & NSINDEX_SEQ_MASK) == 0) {
> + nvdimm_debug("nsindex%d sequence: 0x%x invalid\n", i, seq);
> + continue;
> + }
> +
> + /* sanity check the index against expected values */
> + if (le64_to_cpu(nsindex[i]->myoff) !=
> + i * sizeof_namespace_index(nvdimm)) {
> + nvdimm_debug("nsindex%d myoff: 0x%llx invalid\n",
> + i, (unsigned long long)
> + le64_to_cpu(nsindex[i]->myoff));
> + continue;
> + }
> + if (le64_to_cpu(nsindex[i]->otheroff)
> + != (!i) * sizeof_namespace_index(nvdimm)) {
> + nvdimm_debug("nsindex%d otheroff: 0x%llx invalid\n",
> + i, (unsigned long long)
> + le64_to_cpu(nsindex[i]->otheroff));
> + continue;
> + }
> +
> + size = le64_to_cpu(nsindex[i]->mysize);
> + if (size > sizeof_namespace_index(nvdimm) ||
> + size < sizeof(struct namespace_index)) {
> + nvdimm_debug("nsindex%d mysize: 0x%zx invalid\n", i, size);
> + continue;
> + }
> +
> + nslot = le32_to_cpu(nsindex[i]->nslot);
> + if (nslot * sizeof_namespace_label(nvdimm) +
> + 2 * sizeof_namespace_index(nvdimm) > nvdimm->lsa_size) {
> + nvdimm_debug("nsindex%d nslot: %u invalid, config_size: 0x%zx\n",
> + i, nslot, nvdimm->lsa_size);
> + continue;
> + }
> + valid[i] = true;
> + num_valid++;
> + }
> +
> + switch (num_valid) {
> + case 0:
> + break;
> + case 1:
> + for (i = 0; i < num_index; i++)
> + if (valid[i]) {
> + return i;
> + }
> + /* can't have num_valid > 0 but valid[] = { false, false } */
> + error_report("unexpected index-block parse error");
> + break;
> + default:
> + /* pick the best index... */
> + seq = best_seq(le32_to_cpu(nsindex[0]->seq),
> + le32_to_cpu(nsindex[1]->seq));
> + if (seq == (le32_to_cpu(nsindex[1]->seq) & NSINDEX_SEQ_MASK)) {
> + return 1;
> + } else {
> + return 0;
> + }
> + break;
> + }
> +
> + return -1;
> +}
> +
> +static int nvdimm_label_validate(struct NVDIMMDevice *nvdimm)
> +{
> + int label_size[] = { 128, 256 };
> + int i, rc;
> +
> + for (i = 0; i < ARRAY_SIZE(label_size); i++) {
> + nvdimm->label_size = label_size[i];
> + rc = __nvdimm_label_validate(nvdimm);
> + if (rc >= 0) {
> + return rc;
> + }
> + }
> +
> + return -1;
> +}
> +
> +static int label_next_nsindex(int index)
> +{
> + if (index < 0) {
> + return -1;
> + }
> +
> + return (index + 1) % 2;
> +}
> +
> +static void *label_base(struct NVDIMMDevice *nvdimm)
> +{
> + void *base = to_namespace_index(nvdimm, 0);
> +
> + return base + 2 * sizeof_namespace_index(nvdimm);
> +}
> +
> +static int write_label_index(struct NVDIMMDevice *nvdimm,
> + enum ndctl_namespace_version ver, unsigned index, unsigned seq)
> +{
> + struct namespace_index *nsindex;
> + unsigned long offset;
> + u64 checksum;
> + u32 nslot;
> +
> + /*
> + * We may have initialized ndd to whatever labelsize is
> + * currently on the dimm during label_validate(), so we reset it
> + * to the desired version here.
> + */
> + switch (ver) {
> + case NDCTL_NS_VERSION_1_1:
> + nvdimm->label_size = 128;
> + break;
> + case NDCTL_NS_VERSION_1_2:
> + nvdimm->label_size = 256;
> + break;
> + default:
> + return -1;
> + }
> +
> + nsindex = to_namespace_index(nvdimm, index);
> + nslot = nvdimm_num_label_slots(nvdimm);
> +
> + memcpy(nsindex->sig, NSINDEX_SIGNATURE, NSINDEX_SIG_LEN);
> + memset(nsindex->flags, 0, 3);
> + nsindex->labelsize = sizeof_namespace_label(nvdimm) >> 8;
> + nsindex->seq = cpu_to_le32(seq);
> + offset = (unsigned long) nsindex
> + - (unsigned long) to_namespace_index(nvdimm, 0);
> + nsindex->myoff = cpu_to_le64(offset);
> + nsindex->mysize = cpu_to_le64(sizeof_namespace_index(nvdimm));
> + offset = (unsigned long) to_namespace_index(nvdimm,
> + label_next_nsindex(index))
> + - (unsigned long) to_namespace_index(nvdimm, 0);
> + nsindex->otheroff = cpu_to_le64(offset);
> + offset = (unsigned long) label_base(nvdimm)
> + - (unsigned long) to_namespace_index(nvdimm, 0);
> + nsindex->labeloff = cpu_to_le64(offset);
> + nsindex->nslot = cpu_to_le32(nslot);
> + nsindex->major = cpu_to_le16(1);
> + if (sizeof_namespace_label(nvdimm) < 256) {
> + nsindex->minor = cpu_to_le16(1);
> + } else {
> + nsindex->minor = cpu_to_le16(2);
> + }
> + nsindex->checksum = cpu_to_le64(0);
> + /* init label bitmap */
> + memset(nsindex->free, 0xff, ALIGN(nslot, BITS_PER_LONG) / 8);
> + checksum = fletcher64(nsindex, sizeof_namespace_index(nvdimm), 1);
> + nsindex->checksum = cpu_to_le64(checksum);
> +
> + return 0;
> +}
> +
> +static int nvdimm_init_label(struct NVDIMMDevice *nvdimm)
> +{
> + int i;
> +
> + for (i = 0; i < 2; i++) {
> + int rc;
> +
> + /* To have most compatibility, we init index block with v1.1 */
> + rc = write_label_index(nvdimm, NDCTL_NS_VERSION_1_1, i, 3 - i);
> +
> + if (rc < 0) {
> + error_report("init No.%d index block failed", i);
> + return rc;
> + } else {
> + nvdimm_debug("%s: dump No.%d index block\n", __func__, i);
> + dump_index_block(to_namespace_index(nvdimm, i));
> + }
> + }
> +
> + return 0;
> +}
> +
> static void nvdimm_realize(PCDIMMDevice *dimm, Error **errp)
> {
> NVDIMMDevice *nvdimm = NVDIMM(dimm);
> @@ -187,6 +532,20 @@ static void nvdimm_realize(PCDIMMDevice *dimm, Error
> **errp)
> nvdimm_prepare_memory_region(nvdimm, errp);
> }
>
> + /* When LSA is designaged, validate it. */
> + if (nvdimm->lsa_size != 0) {
> + if (buffer_is_zero(nvdimm->label_data, nvdimm->lsa_size) ||
> + nvdimm_label_validate(nvdimm) < 0) {
> + int rc;
> +
> + info_report("NVDIMM LSA is invalid, needs to be initialized");
> + rc = nvdimm_init_label(nvdimm);
> + if (rc < 0) {
> + error_report("NVDIMM lsa init failed, rc = %d", rc);
> + }
> + }
> + }
> +
> if (ndc->realize) {
> ndc->realize(nvdimm, errp);
> }
> diff --git a/include/hw/mem/nvdimm.h b/include/hw/mem/nvdimm.h
> index 8e6a40dc7b..bc1af9248e 100644
> --- a/include/hw/mem/nvdimm.h
> +++ b/include/hw/mem/nvdimm.h
> @@ -48,14 +48,76 @@
> #define TYPE_NVDIMM "nvdimm"
> OBJECT_DECLARE_TYPE(NVDIMMDevice, NVDIMMClass, NVDIMM)
>
> +typedef uint32_t u32;
> +typedef uint64_t u64;
> +typedef uint8_t u8;
> +typedef uint32_t u32;
> +
> +#define ALIGN(x, y) (((x) + (y) - 1) & ~((y) - 1))
> +
> #define NVDIMM_LSA_SIZE_PROP "lsa-size"
> #define NVDIMM_UUID_PROP "uuid"
> #define NVDIMM_UNARMED_PROP "unarmed"
>
> +enum ndctl_namespace_version {
> + NDCTL_NS_VERSION_1_1,
> + NDCTL_NS_VERSION_1_2,
> +};
> +
> +enum {
> + NSINDEX_SIG_LEN = 16,
> + NSINDEX_ALIGN = 256,
> + NSINDEX_SEQ_MASK = 0x3,
> + NSLABEL_UUID_LEN = 16,
> + NSLABEL_NAME_LEN = 64,
> +};
> +
> +/**
> + * struct namespace_index - label set superblock
> + * @sig: NAMESPACE_INDEX\0
> + * @flags: placeholder
> + * @labelsize: log2 size (v1 labels 128 bytes v2 labels 256 bytes)
> + * @seq: sequence number for this index
> + * @myoff: offset of this index in label area
> + * @mysize: size of this index struct
> + * @otheroff: offset of other index
> + * @labeloff: offset of first label slot
> + * @nslot: total number of label slots
> + * @major: label area major version
> + * @minor: label area minor version
> + * @checksum: fletcher64 of all fields
> + * @free: bitmap, nlabel bits
> + *
> + * The size of free[] is rounded up so the total struct size is a
> + * multiple of NSINDEX_ALIGN bytes. Any bits this allocates beyond
> + * nlabel bits must be zero.
> + */
> +struct namespace_index {
> + uint8_t sig[NSINDEX_SIG_LEN];
> + uint8_t flags[3];
> + uint8_t labelsize;
> + uint32_t seq;
> + uint64_t myoff;
> + uint64_t mysize;
> + uint64_t otheroff;
> + uint64_t labeloff;
> + uint32_t nslot;
> + uint16_t major;
> + uint16_t minor;
> + uint64_t checksum;
> + uint8_t free[0];
> +};
> +
> struct NVDIMMDevice {
> /* private */
> PCDIMMDevice parent_obj;
>
> + /*
> + * Label's size in LSA. Determined by Label version. 128 for v1.1, 256
> + * for v1.2
> + */
> + unsigned int label_size;
> +
> /* public */
>
> /*
> @@ -150,6 +212,48 @@ struct NVDIMMState {
> };
> typedef struct NVDIMMState NVDIMMState;
>
> +#if (NVDIMM_DEBUG == 1)
> +static inline void dump_index_block(struct namespace_index *nsindex)
> +{
> + printf("sig %s\n", nsindex->sig);
> + printf("flags 0x%x 0x%x 0x%x\n", nsindex->flags[0],
> + nsindex->flags[1], nsindex->flags[2]);
> + printf("labelsize %d\n", nsindex->labelsize);
> + printf("seq 0x%0x\n", nsindex->seq);
> + printf("myoff 0x%"PRIx64"\n", nsindex->myoff);
> + printf("mysize 0x%"PRIx64"\n", nsindex->mysize);
> + printf("otheroff 0x%"PRIx64"\n", nsindex->otheroff);
> + printf("labeloff 0x%"PRIx64"\n", nsindex->labeloff);
> + printf("nslot %d\n", nsindex->nslot);
> + printf("major %d\n", nsindex->major);
> + printf("minor %d\n", nsindex->minor);
> + printf("checksum 0x%"PRIx64"\n", nsindex->checksum);
> + printf("-------------------------------\n");
> +}
> +#else
> +static inline void dump_index_block(struct namespace_index *nsindex)
> +{
> +}
> +#endif
> +
> +/*
> + * Note, fletcher64() is copied from drivers/nvdimm/label.c in the Linux
> kernel
> + */
> +static inline u64 fletcher64(void *addr, size_t len, bool le)
> +{
> + u32 *buf = addr;
> + u32 lo32 = 0;
> + u64 hi32 = 0;
> + size_t i;
> +
> + for (i = 0; i < len / sizeof(u32); i++) {
> + lo32 += le ? le32_to_cpu((u32) buf[i]) : buf[i];
> + hi32 += lo32;
> + }
> +
> + return hi32 << 32 | lo32;
> +}
> +
> void nvdimm_init_acpi_state(NVDIMMState *state, MemoryRegion *io,
> struct AcpiGenericAddress dsm_io,
> FWCfgState *fw_cfg, Object *owner);