static ssize_t msr_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
const u32 __user *tmp = (const u32 __user *)buf;
u32 data[2];
u32 reg = *ppos;
int cpu = iminor(file->f_path.dentry->d_inode);
int err = 0;
ssize_t bytes = 0;
if (count % 8)
return -EINVAL; /* Invalid chunk size */
for (; count; count -= 8) {
if (copy_from_user(&data, tmp, 8)) {
err = -EFAULT;
break;
}
err = wrmsr_safe_on_cpu(cpu, reg, data[0], data[1]);
if (err)
break;
tmp += 2;
bytes += 8;
}
return bytes ? bytes : err;
}
static ssize_t msr_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
const u32 __user *tmp = (const u32 __user *)buf;
u32 curdata[2];
u32 data[2];
u32 reg = *ppos;
u64 mask;
int cpu = iminor(file_inode(file));
int err = 0;
ssize_t bytes = 0;
struct msr_session_info *myinfo = file->private_data;
if (count % 8)
return -EINVAL; /* Invalid chunk size */
mask = myinfo->rawio_allowed ? 0xffffffffffffffff :
msr_whitelist_writemask(reg);
if (!myinfo->rawio_allowed && mask == 0)
return -EACCES;
for (; count; count -= 8) {
if (copy_from_user(&data, tmp, 8)) {
err = -EFAULT;
break;
}
if (mask != 0xffffffffffffffff) {
err = rdmsr_safe_on_cpu(cpu, reg,
&curdata[0], &curdata[1]);
if (err)
break;
*(u64 *)&curdata[0] &= ~mask;
*(u64 *)&data[0] &= mask;
*(u64 *)&data[0] |= *(u64 *)&curdata[0];
}
err = wrmsr_safe_on_cpu(cpu, reg, data[0], data[1]);
if (err)
break;
tmp += 2;
bytes += 8;
}
return bytes ? bytes : err;
}
int VBOXCALL supdrvOSMsrProberWrite(uint32_t uMsr, RTCPUID idCpu, uint64_t uValue)
{
# ifdef SUPDRV_LINUX_HAS_SAFE_MSR_API
int rc;
if (idCpu == NIL_RTCPUID)
rc = wrmsr_safe(uMsr, RT_LODWORD(uValue), RT_HIDWORD(uValue));
else if (RTMpIsCpuOnline(idCpu))
rc = wrmsr_safe_on_cpu(idCpu, uMsr, RT_LODWORD(uValue), RT_HIDWORD(uValue));
else
return VERR_CPU_OFFLINE;
if (rc == 0)
return VINF_SUCCESS;
return VERR_ACCESS_DENIED;
# else
return VERR_NOT_SUPPORTED;
# endif
}
