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[common/client] ivshmem: add portable external frames

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This commit is contained in:
Geoffrey McRae
2026-09-12 09:49:24 +10:00
parent 6d367d4ab2
commit 382f35e503
28 changed files with 946 additions and 227 deletions
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66
common/src/platform/linux/ivshmem.c
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@@ -18,7 +18,7 @@
* Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "common/ivshmem.h"
#include "common/ivshmem_dmabuf.h"
#include <dirent.h>
#include <fcntl.h>
@@ -39,9 +39,9 @@
struct IVSHMEMInfo
{
int devFd;
int size;
bool hasDMA;
int devFd;
size_t size;
bool hasDMA;
};
static bool ivshmemDeviceValidator(struct Option * opt, const char ** error)
@@ -115,23 +115,34 @@ void ivshmemOptionsInit(void)
bool ivshmemInit(struct IVSHMEM * dev)
{
// FIXME: split code from ivshmemOpen
DEBUG_ASSERT(dev && !dev->opaque);
dev->size = 0;
dev->mem = NULL;
dev->opaque = NULL;
return true;
}
bool ivshmemOpen(struct IVSHMEM * dev)
bool ivshmemOpen(struct IVSHMEM * dev, IVSHMEMCacheMode cacheMode)
{
return ivshmemOpenDev(dev, option_get_string("app", "shmFile"));
return ivshmemOpenDev(dev, option_get_string("app", "shmFile"),
cacheMode);
}
bool ivshmemOpenDev(struct IVSHMEM * dev, const char * shmDevice)
bool ivshmemOpenDev(struct IVSHMEM * dev, const char * shmDevice,
IVSHMEMCacheMode cacheMode)
{
DEBUG_ASSERT(dev);
DEBUG_ASSERT(dev && !dev->opaque && !dev->mem);
int devSize;
int devFd;
bool hasDMA;
size_t devSize;
int devFd;
bool hasDMA;
/* POSIX mmap does not expose the Windows IVSHMEM driver's cache modes. */
(void)cacheMode;
dev->size = 0;
dev->mem = NULL;
dev->opaque = NULL;
DEBUG_INFO("KVMFR Device : %s", shmDevice);
@@ -147,14 +158,15 @@ bool ivshmemOpenDev(struct IVSHMEM * dev, const char * shmDevice)
}
// get the device size
devSize = ioctl(devFd, KVMFR_DMABUF_GETSIZE, 0);
if (devSize < 0)
const int size = ioctl(devFd, KVMFR_DMABUF_GETSIZE, 0);
if (size <= 0)
{
DEBUG_ERROR("Failed to get the device size");
close(devFd);
return false;
}
hasDMA = true;
devSize = (size_t)size;
hasDMA = true;
}
else
{
@@ -175,7 +187,14 @@ bool ivshmemOpenDev(struct IVSHMEM * dev, const char * shmDevice)
return false;
}
devSize = st.st_size;
if (st.st_size <= 0 || (uintmax_t)st.st_size > SIZE_MAX)
{
DEBUG_ERROR("Invalid shared memory size: %s", shmDevice);
close(devFd);
return false;
}
devSize = (size_t)st.st_size;
hasDMA = false;
}
@@ -189,6 +208,14 @@ bool ivshmemOpenDev(struct IVSHMEM * dev, const char * shmDevice)
}
struct IVSHMEMInfo * info = malloc(sizeof(*info));
if (!info)
{
DEBUG_ERROR("Failed to allocate IVSHMEM device state");
munmap(map, devSize);
close(devFd);
return false;
}
info->size = devSize;
info->devFd = devFd;
info->hasDMA = hasDMA;
@@ -220,7 +247,10 @@ void ivshmemClose(struct IVSHMEM * dev)
void ivshmemFree(struct IVSHMEM * dev)
{
// FIXME: split code from ivshmemClose
DEBUG_ASSERT(dev);
if (dev->opaque)
ivshmemClose(dev);
}
bool ivshmemHasDMA(struct IVSHMEM * dev)
@@ -237,7 +267,7 @@ int ivshmemGetDMABuf(struct IVSHMEM * dev, uint64_t offset, uint64_t size)
{
DEBUG_ASSERT(ivshmemHasDMA(dev));
DEBUG_ASSERT(dev && dev->opaque);
DEBUG_ASSERT(offset + size <= dev->size);
DEBUG_ASSERT(offset <= dev->size && size <= dev->size - offset);
static long pageSize = 0;