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[common] added back support for shared memory files

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This commit is contained in:
Geoffrey McRae
2020-01-06 00:20:30 +11:00
parent 0dc0e6490c
commit 45ee79014d
4 changed files with 43 additions and 29 deletions
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50
common/src/platform/linux/ivshmem.c
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@@ -82,6 +82,18 @@ static char * uioGetName(const char * shmDevice)
static bool ivshmemDeviceValidator(struct Option * opt, const char ** error)
{
// if it's not a uio device, it must be a file on disk
if (strlen(opt->value.x_string) > 3 && memcmp(opt->value.x_string, "uio", 3) != 0)
{
struct stat st;
if (stat(opt->value.x_string, &st) != 0)
{
*error = "Invalid path to the ivshmem file specified";
return false;
}
return true;
}
char * name = uioGetName(opt->value.x_string);
if (!name)
{
@@ -133,11 +145,12 @@ void ivshmemOptionsInit()
struct Option options[] =
{
{
.module = "os",
.name = "shmDevice",
.description = "The IVSHMEM device to use",
.module = "app",
.name = "shmFile",
.shortopt = 'f',
.description = "The path to the shared memory file, or the name of the uio device to use, ie: uio0",
.type = OPTION_TYPE_STRING,
.value.x_string = "uio0",
.value.x_string = "/dev/shm/looking-glass",
.validator = ivshmemDeviceValidator,
.getValues = ivshmemDeviceGetValues
},
@@ -151,12 +164,15 @@ bool ivshmemOpen(struct IVSHMEM * dev)
{
assert(dev);
const char * shmDevice = option_get_string("os", "shmDevice");
const char * shmDevice = option_get_string("app", "shmFile");
unsigned int devSize;
int devFD;
dev->opaque = NULL;
DEBUG_INFO("KVMFR Device : %s", shmDevice);
if (strlen(shmDevice) > 3 && memcmp(shmDevice, "uio", 3) == 0)
{
// get the device size
int fd = uioOpenFile(shmDevice, "maps/map0/size");
@@ -178,9 +194,7 @@ bool ivshmemOpen(struct IVSHMEM * dev)
size[len] = '\0';
close(fd);
devSize = strtoul(size, NULL, 16);
}
{
char * path;
alloc_sprintf(&path, "/dev/%s", shmDevice);
devFD = open(path, O_RDWR, (mode_t)0600);
@@ -193,11 +207,27 @@ bool ivshmemOpen(struct IVSHMEM * dev)
}
free(path);
}
else
{
struct stat st;
if (stat(shmDevice, &st) != 0)
{
DEBUG_ERROR("Failed to stat: %s", shmDevice);
return false;
}
devSize = st.st_size;
devFD = open(shmDevice, O_RDWR, (mode_t)0600);
if (devFD < 0)
{
DEBUG_ERROR("Failed to open: %s", shmDevice);
return false;
}
}
void * map = mmap(0, devSize, PROT_READ | PROT_WRITE, MAP_SHARED, devFD, 0);
if (map == MAP_FAILED)
{
const char * shmDevice = option_get_string("os", "shmDevice");
DEBUG_ERROR("Failed to map the shared memory device: %s", shmDevice);
return false;
}
@@ -217,6 +247,9 @@ void ivshmemClose(struct IVSHMEM * dev)
{
assert(dev);
if (!dev->opaque)
return;
struct IVSHMEMInfo * info =
(struct IVSHMEMInfo *)dev->opaque;
@@ -224,4 +257,5 @@ void ivshmemClose(struct IVSHMEM * dev)
close(info->fd);
free(info);
dev->opaque = NULL;
}