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hw/cxl: Add support for device sanitation

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Make use of the background operations through the sanitize command, per CXL
3.0 specs. Traditionally run times can be rather long, depending on the
size of the media.

Estimate times based on:
	 https://pmem.io/documents/NVDIMM_DSM_Interface-V1.8.pdf

Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20231023160806.13206-14-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Davidlohr Bueso 2023-10-23 17:08:02 +01:00 committed by Michael S. Tsirkin
parent 43efb0bfad
commit 25a52959f9
3 changed files with 167 additions and 0 deletions
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140
hw/cxl/cxl-mailbox-utils.c
View File

@ -18,6 +18,7 @@
#include "qemu/log.h"
#include "qemu/units.h"
#include "qemu/uuid.h"
#include "sysemu/hostmem.h"
#define CXL_CAPACITY_MULTIPLIER (256 * MiB)
@ -68,6 +69,9 @@ enum {
#define GET_PARTITION_INFO 0x0
#define GET_LSA 0x2
#define SET_LSA 0x3
SANITIZE = 0x44,
#define OVERWRITE 0x0
#define SECURE_ERASE 0x1
MEDIA_AND_POISON = 0x43,
#define GET_POISON_LIST 0x0
#define INJECT_POISON 0x1
@ -749,6 +753,108 @@ static CXLRetCode cmd_ccls_set_lsa(const struct cxl_cmd *cmd,
return CXL_MBOX_SUCCESS;
}
/* Perform the actual device zeroing */
static void __do_sanitization(CXLType3Dev *ct3d)
{
MemoryRegion *mr;
if (ct3d->hostvmem) {
mr = host_memory_backend_get_memory(ct3d->hostvmem);
if (mr) {
void *hostmem = memory_region_get_ram_ptr(mr);
memset(hostmem, 0, memory_region_size(mr));
}
}
if (ct3d->hostpmem) {
mr = host_memory_backend_get_memory(ct3d->hostpmem);
if (mr) {
void *hostmem = memory_region_get_ram_ptr(mr);
memset(hostmem, 0, memory_region_size(mr));
}
}
if (ct3d->lsa) {
mr = host_memory_backend_get_memory(ct3d->lsa);
if (mr) {
void *lsa = memory_region_get_ram_ptr(mr);
memset(lsa, 0, memory_region_size(mr));
}
}
}
/*
* CXL 3.0 spec section 8.2.9.8.5.1 - Sanitize.
*
* Once the Sanitize command has started successfully, the device shall be
* placed in the media disabled state. If the command fails or is interrupted
* by a reset or power failure, it shall remain in the media disabled state
* until a successful Sanitize command has been completed. During this state:
*
* 1. Memory writes to the device will have no effect, and all memory reads
* will return random values (no user data returned, even for locations that
* the failed Sanitize operation didn’t sanitize yet).
*
* 2. Mailbox commands shall still be processed in the disabled state, except
* that commands that access Sanitized areas shall fail with the Media Disabled
* error code.
*/
static CXLRetCode cmd_sanitize_overwrite(const struct cxl_cmd *cmd,
uint8_t *payload_in,
size_t len_in,
uint8_t *payload_out,
size_t *len_out,
CXLCCI *cci)
{
CXLType3Dev *ct3d = CXL_TYPE3(cci->d);
uint64_t total_mem; /* in Mb */
int secs;
total_mem = (ct3d->cxl_dstate.vmem_size + ct3d->cxl_dstate.pmem_size) >> 20;
if (total_mem <= 512) {
secs = 4;
} else if (total_mem <= 1024) {
secs = 8;
} else if (total_mem <= 2 * 1024) {
secs = 15;
} else if (total_mem <= 4 * 1024) {
secs = 30;
} else if (total_mem <= 8 * 1024) {
secs = 60;
} else if (total_mem <= 16 * 1024) {
secs = 2 * 60;
} else if (total_mem <= 32 * 1024) {
secs = 4 * 60;
} else if (total_mem <= 64 * 1024) {
secs = 8 * 60;
} else if (total_mem <= 128 * 1024) {
secs = 15 * 60;
} else if (total_mem <= 256 * 1024) {
secs = 30 * 60;
} else if (total_mem <= 512 * 1024) {
secs = 60 * 60;
} else if (total_mem <= 1024 * 1024) {
secs = 120 * 60;
} else {
secs = 240 * 60; /* max 4 hrs */
}
/* EBUSY other bg cmds as of now */
cci->bg.runtime = secs * 1000UL;
*len_out = 0;
cxl_dev_disable_media(&ct3d->cxl_dstate);
if (secs > 2) {
/* sanitize when done */
return CXL_MBOX_BG_STARTED;
} else {
__do_sanitization(ct3d);
cxl_dev_enable_media(&ct3d->cxl_dstate);
return CXL_MBOX_SUCCESS;
}
}
/*
* This is very inefficient, but good enough for now!
* Also the payload will always fit, so no need to handle the MORE flag and
@ -993,6 +1099,8 @@ static const struct cxl_cmd cxl_cmd_set[256][256] = {
[CCLS][GET_LSA] = { "CCLS_GET_LSA", cmd_ccls_get_lsa, 8, 0 },
[CCLS][SET_LSA] = { "CCLS_SET_LSA", cmd_ccls_set_lsa,
~0, IMMEDIATE_CONFIG_CHANGE | IMMEDIATE_DATA_CHANGE },
[SANITIZE][OVERWRITE] = { "SANITIZE_OVERWRITE", cmd_sanitize_overwrite, 0,
IMMEDIATE_DATA_CHANGE | SECURITY_STATE_CHANGE | BACKGROUND_OPERATION },
[MEDIA_AND_POISON][GET_POISON_LIST] = { "MEDIA_AND_POISON_GET_POISON_LIST",
cmd_media_get_poison_list, 16, 0 },
[MEDIA_AND_POISON][INJECT_POISON] = { "MEDIA_AND_POISON_INJECT_POISON",
@ -1050,6 +1158,21 @@ int cxl_process_cci_message(CXLCCI *cci, uint8_t set, uint8_t cmd,
return CXL_MBOX_BUSY;
}
/* forbid any selected commands while overwriting */
if (sanitize_running(cci)) {
if (h == cmd_events_get_records ||
h == cmd_ccls_get_partition_info ||
h == cmd_ccls_set_lsa ||
h == cmd_ccls_get_lsa ||
h == cmd_logs_get_log ||
h == cmd_media_get_poison_list ||
h == cmd_media_inject_poison ||
h == cmd_media_clear_poison ||
h == cmd_sanitize_overwrite) {
return CXL_MBOX_MEDIA_DISABLED;
}
}
ret = (*h)(cxl_cmd, pl_in, len_in, pl_out, len_out, cci);
if ((cxl_cmd->effect & BACKGROUND_OPERATION) &&
ret == CXL_MBOX_BG_STARTED) {
@ -1088,6 +1211,23 @@ static void bg_timercb(void *opaque)
cci->bg.complete_pct = 100;
cci->bg.ret_code = ret;
if (ret == CXL_MBOX_SUCCESS) {
switch (cci->bg.opcode) {
case 0x4400: /* sanitize */
{
CXLType3Dev *ct3d = CXL_TYPE3(cci->d);
__do_sanitization(ct3d);
cxl_dev_enable_media(&ct3d->cxl_dstate);
}
break;
case 0x4304: /* TODO: scan media */
break;
default:
__builtin_unreachable();
break;
}
}
qemu_log("Background command %04xh finished: %s\n",
cci->bg.opcode,

10
hw/mem/cxl_type3.c
View File

@ -23,6 +23,7 @@
#include "qemu/pmem.h"
#include "qemu/range.h"
#include "qemu/rcu.h"
#include "qemu/guest-random.h"
#include "sysemu/hostmem.h"
#include "sysemu/numa.h"
#include "hw/cxl/cxl.h"
@ -897,6 +898,11 @@ MemTxResult cxl_type3_read(PCIDevice *d, hwaddr host_addr, uint64_t *data,
return MEMTX_ERROR;
}
if (sanitize_running(&CXL_TYPE3(d)->cci)) {
qemu_guest_getrandom_nofail(data, size);
return MEMTX_OK;
}
return address_space_read(as, dpa_offset, attrs, data, size);
}
@ -913,6 +919,10 @@ MemTxResult cxl_type3_write(PCIDevice *d, hwaddr host_addr, uint64_t data,
return MEMTX_ERROR;
}
if (sanitize_running(&CXL_TYPE3(d)->cci)) {
return MEMTX_OK;
}
return address_space_write(as, dpa_offset, attrs, &data, size);
}

17
include/hw/cxl/cxl_device.h
View File

@ -343,6 +343,23 @@ REG64(CXL_MEM_DEV_STS, 0)
FIELD(CXL_MEM_DEV_STS, MBOX_READY, 4, 1)
FIELD(CXL_MEM_DEV_STS, RESET_NEEDED, 5, 3)
static inline void __toggle_media(CXLDeviceState *cxl_dstate, int val)
{
uint64_t dev_status_reg;
dev_status_reg = FIELD_DP64(0, CXL_MEM_DEV_STS, MEDIA_STATUS, val);
cxl_dstate->mbox_reg_state64[R_CXL_MEM_DEV_STS] = dev_status_reg;
}
#define cxl_dev_disable_media(cxlds) \
do { __toggle_media((cxlds), 0x3); } while (0)
#define cxl_dev_enable_media(cxlds) \
do { __toggle_media((cxlds), 0x1); } while (0)
static inline bool sanitize_running(CXLCCI *cci)
{
return !!cci->bg.runtime && cci->bg.opcode == 0x4400;
}
typedef struct CXLError {
QTAILQ_ENTRY(CXLError) node;
int type; /* Error code as per FE definition */