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hw/uefi: add var-service-core.c 

This is the core code for guest <-> host communication.  This accepts
request messages from the guest, dispatches them to the service called,
and sends back the response message.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-ID: <20250225163031.1409078-11-kraxel@redhat.com>
pull/291/head
Gerd Hoffmann 1 year ago
parent
034cb968ca
commit
90ca4e03c2
1 changed files with 321 additions and 0 deletions
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  1. 321
      hw/uefi/var-service-core.c

321
hw/uefi/var-service-core.c
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/*
* SPDX-License-Identifier: GPL-2.0-or-later
*
* uefi vars device
*/
#include "qemu/osdep.h"
#include "qemu/crc32c.h"
#include "system/dma.h"
#include "migration/vmstate.h"
#include "hw/uefi/var-service.h"
#include "hw/uefi/var-service-api.h"
#include "hw/uefi/var-service-edk2.h"
#include "trace/trace-hw_uefi.h"
static int uefi_vars_pre_load(void *opaque)
{
uefi_vars_state *uv = opaque;
uefi_vars_clear_all(uv);
uefi_vars_policies_clear(uv);
g_free(uv->buffer);
return 0;
}
static int uefi_vars_post_load(void *opaque, int version_id)
{
uefi_vars_state *uv = opaque;
uefi_vars_update_storage(uv);
uv->buffer = g_malloc(uv->buf_size);
return 0;
}
const VMStateDescription vmstate_uefi_vars = {
.name = "uefi-vars",
.pre_load = uefi_vars_pre_load,
.post_load = uefi_vars_post_load,
.fields = (VMStateField[]) {
VMSTATE_UINT16(sts, uefi_vars_state),
VMSTATE_UINT32(buf_size, uefi_vars_state),
VMSTATE_UINT32(buf_addr_lo, uefi_vars_state),
VMSTATE_UINT32(buf_addr_hi, uefi_vars_state),
VMSTATE_UINT32(pio_xfer_offset, uefi_vars_state),
VMSTATE_VBUFFER_ALLOC_UINT32(pio_xfer_buffer, uefi_vars_state,
0, NULL, buf_size),
VMSTATE_BOOL(end_of_dxe, uefi_vars_state),
VMSTATE_BOOL(ready_to_boot, uefi_vars_state),
VMSTATE_BOOL(exit_boot_service, uefi_vars_state),
VMSTATE_BOOL(policy_locked, uefi_vars_state),
VMSTATE_UINT64(used_storage, uefi_vars_state),
VMSTATE_QTAILQ_V(variables, uefi_vars_state, 0,
vmstate_uefi_variable, uefi_variable, next),
VMSTATE_QTAILQ_V(var_policies, uefi_vars_state, 0,
vmstate_uefi_var_policy, uefi_var_policy, next),
VMSTATE_END_OF_LIST()
},
};
static uint32_t uefi_vars_cmd_mm(uefi_vars_state *uv, bool dma_mode)
{
hwaddr dma;
mm_header *mhdr;
uint64_t size;
uint32_t retval;
dma = uv->buf_addr_lo | ((hwaddr)uv->buf_addr_hi << 32);
mhdr = (mm_header *) uv->buffer;
if (!uv->buffer || uv->buf_size < sizeof(*mhdr)) {
return UEFI_VARS_STS_ERR_BAD_BUFFER_SIZE;
}
/* read header */
if (dma_mode) {
dma_memory_read(&address_space_memory, dma,
uv->buffer, sizeof(*mhdr),
MEMTXATTRS_UNSPECIFIED);
} else {
memcpy(uv->buffer, uv->pio_xfer_buffer, sizeof(*mhdr));
}
if (uadd64_overflow(sizeof(*mhdr), mhdr->length, &size)) {
return UEFI_VARS_STS_ERR_BAD_BUFFER_SIZE;
}
if (uv->buf_size < size) {
return UEFI_VARS_STS_ERR_BAD_BUFFER_SIZE;
}
/* read buffer (excl header) */
if (dma_mode) {
dma_memory_read(&address_space_memory, dma + sizeof(*mhdr),
uv->buffer + sizeof(*mhdr), mhdr->length,
MEMTXATTRS_UNSPECIFIED);
} else {
memcpy(uv->buffer + sizeof(*mhdr),
uv->pio_xfer_buffer + sizeof(*mhdr),
mhdr->length);
}
memset(uv->buffer + size, 0, uv->buf_size - size);
/* dispatch */
if (qemu_uuid_is_equal(&mhdr->guid, &EfiSmmVariableProtocolGuid)) {
retval = uefi_vars_mm_vars_proto(uv);
} else if (qemu_uuid_is_equal(&mhdr->guid, &VarCheckPolicyLibMmiHandlerGuid)) {
retval = uefi_vars_mm_check_policy_proto(uv);
} else if (qemu_uuid_is_equal(&mhdr->guid, &EfiEndOfDxeEventGroupGuid)) {
trace_uefi_event("end-of-dxe");
uv->end_of_dxe = true;
retval = UEFI_VARS_STS_SUCCESS;
} else if (qemu_uuid_is_equal(&mhdr->guid, &EfiEventReadyToBootGuid)) {
trace_uefi_event("ready-to-boot");
uv->ready_to_boot = true;
retval = UEFI_VARS_STS_SUCCESS;
} else if (qemu_uuid_is_equal(&mhdr->guid, &EfiEventExitBootServicesGuid)) {
trace_uefi_event("exit-boot-service");
uv->exit_boot_service = true;
retval = UEFI_VARS_STS_SUCCESS;
} else {
retval = UEFI_VARS_STS_ERR_NOT_SUPPORTED;
}
/* write buffer */
if (dma_mode) {
dma_memory_write(&address_space_memory, dma,
uv->buffer, sizeof(*mhdr) + mhdr->length,
MEMTXATTRS_UNSPECIFIED);
} else {
memcpy(uv->pio_xfer_buffer + sizeof(*mhdr),
uv->buffer + sizeof(*mhdr),
sizeof(*mhdr) + mhdr->length);
}
return retval;
}
static void uefi_vars_soft_reset(uefi_vars_state *uv)
{
g_free(uv->buffer);
uv->buffer = NULL;
uv->buf_size = 0;
uv->buf_addr_lo = 0;
uv->buf_addr_hi = 0;
}
void uefi_vars_hard_reset(uefi_vars_state *uv)
{
trace_uefi_hard_reset();
uefi_vars_soft_reset(uv);
uv->end_of_dxe = false;
uv->ready_to_boot = false;
uv->exit_boot_service = false;
uv->policy_locked = false;
uefi_vars_clear_volatile(uv);
uefi_vars_policies_clear(uv);
uefi_vars_auth_init(uv);
}
static uint32_t uefi_vars_cmd(uefi_vars_state *uv, uint32_t cmd)
{
switch (cmd) {
case UEFI_VARS_CMD_RESET:
uefi_vars_soft_reset(uv);
return UEFI_VARS_STS_SUCCESS;
case UEFI_VARS_CMD_DMA_MM:
return uefi_vars_cmd_mm(uv, true);
case UEFI_VARS_CMD_PIO_MM:
return uefi_vars_cmd_mm(uv, false);
case UEFI_VARS_CMD_PIO_ZERO_OFFSET:
uv->pio_xfer_offset = 0;
return UEFI_VARS_STS_SUCCESS;
default:
return UEFI_VARS_STS_ERR_NOT_SUPPORTED;
}
}
static uint64_t uefi_vars_read(void *opaque, hwaddr addr, unsigned size)
{
uefi_vars_state *uv = opaque;
uint64_t retval = -1;
void *xfer_ptr;
trace_uefi_reg_read(addr, size);
switch (addr) {
case UEFI_VARS_REG_MAGIC:
retval = UEFI_VARS_MAGIC_VALUE;
break;
case UEFI_VARS_REG_CMD_STS:
retval = uv->sts;
break;
case UEFI_VARS_REG_BUFFER_SIZE:
retval = uv->buf_size;
break;
case UEFI_VARS_REG_DMA_BUFFER_ADDR_LO:
retval = uv->buf_addr_lo;
break;
case UEFI_VARS_REG_DMA_BUFFER_ADDR_HI:
retval = uv->buf_addr_hi;
break;
case UEFI_VARS_REG_PIO_BUFFER_TRANSFER:
if (uv->pio_xfer_offset + size > uv->buf_size) {
retval = 0;
break;
}
xfer_ptr = uv->pio_xfer_buffer + uv->pio_xfer_offset;
switch (size) {
case 1:
retval = *(uint8_t *)xfer_ptr;
break;
case 2:
retval = *(uint16_t *)xfer_ptr;
break;
case 4:
retval = *(uint32_t *)xfer_ptr;
break;
case 8:
retval = *(uint64_t *)xfer_ptr;
break;
}
uv->pio_xfer_offset += size;
break;
case UEFI_VARS_REG_PIO_BUFFER_CRC32C:
retval = crc32c(0xffffffff, uv->pio_xfer_buffer, uv->pio_xfer_offset);
break;
case UEFI_VARS_REG_FLAGS:
retval = 0;
if (uv->use_pio) {
retval |= UEFI_VARS_FLAG_USE_PIO;
}
}
return retval;
}
static void uefi_vars_write(void *opaque, hwaddr addr, uint64_t val, unsigned size)
{
uefi_vars_state *uv = opaque;
void *xfer_ptr;
trace_uefi_reg_write(addr, val, size);
switch (addr) {
case UEFI_VARS_REG_CMD_STS:
uv->sts = uefi_vars_cmd(uv, val);
break;
case UEFI_VARS_REG_BUFFER_SIZE:
if (val > MAX_BUFFER_SIZE) {
val = MAX_BUFFER_SIZE;
}
uv->buf_size = val;
g_free(uv->buffer);
g_free(uv->pio_xfer_buffer);
uv->buffer = g_malloc(uv->buf_size);
uv->pio_xfer_buffer = g_malloc(uv->buf_size);
break;
case UEFI_VARS_REG_DMA_BUFFER_ADDR_LO:
uv->buf_addr_lo = val;
break;
case UEFI_VARS_REG_DMA_BUFFER_ADDR_HI:
uv->buf_addr_hi = val;
break;
case UEFI_VARS_REG_PIO_BUFFER_TRANSFER:
if (uv->pio_xfer_offset + size > uv->buf_size) {
break;
}
xfer_ptr = uv->pio_xfer_buffer + uv->pio_xfer_offset;
switch (size) {
case 1:
*(uint8_t *)xfer_ptr = val;
break;
case 2:
*(uint16_t *)xfer_ptr = val;
break;
case 4:
*(uint32_t *)xfer_ptr = val;
break;
case 8:
*(uint64_t *)xfer_ptr = val;
break;
}
uv->pio_xfer_offset += size;
break;
case UEFI_VARS_REG_PIO_BUFFER_CRC32C:
case UEFI_VARS_REG_FLAGS:
default:
break;
}
}
static const MemoryRegionOps uefi_vars_ops = {
.read = uefi_vars_read,
.write = uefi_vars_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.impl = {
.min_access_size = 2,
.max_access_size = 4,
},
};
void uefi_vars_init(Object *obj, uefi_vars_state *uv)
{
QTAILQ_INIT(&uv->variables);
QTAILQ_INIT(&uv->var_policies);
uv->jsonfd = -1;
memory_region_init_io(&uv->mr, obj, &uefi_vars_ops, uv,
"uefi-vars", UEFI_VARS_REGS_SIZE);
}
void uefi_vars_realize(uefi_vars_state *uv, Error **errp)
{
uefi_vars_json_init(uv, errp);
uefi_vars_json_load(uv, errp);
}
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