diff options
Diffstat (limited to 'kernel/main.c')
| -rw-r--r-- | kernel/main.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/kernel/main.c b/kernel/main.c index 2ec7ab9..84a05ca 100644 --- a/kernel/main.c +++ b/kernel/main.c @@ -2628,6 +2628,44 @@ module_param_cb(dump_vidmem, &nv_vgpu_dump_vidmem_ops, NULL, 0200); MODULE_PARM_DESC(dump_vidmem, "Dump emulated vidmem range (hex offset,hex len)"); /* + * Debug: write a u32 into the emulated vidmem (BAR1 backing) at an offset: + * echo 0x<offset>,0x<value> > .../parameters/poke_vidmem + */ +static int nv_vgpu_poke_vidmem_set(const char *val, const struct kernel_param *kp) +{ + struct nv_vgpu_device *vgpu; + u64 off = 0, value = 0; + char *end; + int ret = 0; + + if (sscanf(val, "%lli,%lli", &off, &value) != 2) + return -EINVAL; + + mutex_lock(&nv_vgpu_driver.lock); + list_for_each_entry(vgpu, &nv_vgpu_driver.devices, list) { + if (atomic_read(&vgpu->vfio_dev_open_count) <= 0) + continue; + if (!vgpu->bars[1].vaddr || off + 4 > vgpu->bars[1].size) { + ret = -EINVAL; + break; + } + memcpy(vgpu->bars[1].vaddr + off, &value, 4); + pr_info("poke_vidmem: [0x%llx] = 0x%llx\n", off, value); + break; + } + mutex_unlock(&nv_vgpu_driver.lock); + (void)end; + return ret; +} + +static const struct kernel_param_ops nv_vgpu_poke_vidmem_ops = { + .set = nv_vgpu_poke_vidmem_set, +}; + +module_param_cb(poke_vidmem, &nv_vgpu_poke_vidmem_ops, NULL, 0200); +MODULE_PARM_DESC(poke_vidmem, "Write u32 to emulated vidmem (hex offset,hex value)"); + +/* * Debug: hex-dump a guest physical range (kthread: guest-DMA needs it): * echo 0x<gpa>,0x<len> > .../parameters/dump_guest */ |