/**
* Check if this page needs to be analysed by CSAM.
*
* This function should only be called for supervisor pages and
* only when CSAM is enabled. Leaving these selection criteria
* to the caller simplifies the interface (PTE passing).
*
* Note that the page has not yet been synced, so the TLB trick
* (which wasn't ever active anyway) cannot be applied.
*
* @returns true if the page should be marked not present because
* CSAM want need to scan it.
* @returns false if the page was already scanned.
* @param pVM Pointer to the VM.
* @param GCPtr GC pointer of page
*/
VMM_INT_DECL(bool) CSAMDoesPageNeedScanning(PVM pVM, RTRCUINTPTR GCPtr)
{
if(!CSAMIsEnabled(pVM))
return false;
if(CSAMIsPageScanned(pVM, (RTRCPTR)GCPtr))
{
/* Already checked! */
STAM_COUNTER_ADD(&CTXSUFF(pVM->csam.s.StatNrKnownPages), 1);
return false;
}
STAM_COUNTER_ADD(&CTXSUFF(pVM->csam.s.StatNrPageNP), 1);
return true;
}
/**
* Check if this page needs to be analysed by CSAM
*
* @returns VBox status code
* @param pVM Pointer to the VM.
* @param pvFault Fault address
*/
VMM_INT_DECL(int) CSAMExecFault(PVM pVM, RTRCPTR pvFault)
{
if(!CSAMIsEnabled(pVM))
return VINF_SUCCESS;
LogFlow(("CSAMGCExecFault: for page %08X scanned=%d\n", pvFault, CSAMIsPageScanned(pVM, pvFault)));
if(CSAMIsPageScanned(pVM, pvFault))
{
// Already checked!
STAM_COUNTER_ADD(&pVM->csam.s.StatNrKnownPagesGC, 1);
return VINF_SUCCESS;
}
STAM_COUNTER_ADD(&pVM->csam.s.StatNrTraps, 1);
VMCPU_FF_SET(VMMGetCpu0(pVM), VMCPU_FF_CSAM_SCAN_PAGE);
return VINF_CSAM_PENDING_ACTION;
}
/**
* Receive thread loop.
*
* @returns 0 on success.
* @param ThreadSelf Thread handle to this thread.
* @param pvUser User argument.
*/
static DECLCALLBACK(int) drvCharReceiveLoop(RTTHREAD ThreadSelf, void *pvUser)
{
PDRVCHAR pThis = (PDRVCHAR)pvUser;
char abBuffer[256];
char *pbRemaining = abBuffer;
size_t cbRemaining = 0;
int rc;
while (!pThis->fShutdown)
{
if (!cbRemaining)
{
/* Get block of data from stream driver. */
if (pThis->pDrvStream)
{
pbRemaining = abBuffer;
cbRemaining = sizeof(abBuffer);
rc = pThis->pDrvStream->pfnRead(pThis->pDrvStream, abBuffer, &cbRemaining);
if (RT_FAILURE(rc))
{
LogFlow(("Read failed with %Rrc\n", rc));
break;
}
}
else
RTThreadSleep(100);
}
else
{
/* Send data to guest. */
size_t cbProcessed = cbRemaining;
rc = pThis->pDrvCharPort->pfnNotifyRead(pThis->pDrvCharPort, pbRemaining, &cbProcessed);
if (RT_SUCCESS(rc))
{
Assert(cbProcessed);
pbRemaining += cbProcessed;
cbRemaining -= cbProcessed;
STAM_COUNTER_ADD(&pThis->StatBytesRead, cbProcessed);
}
else if (rc == VERR_TIMEOUT)
{
/* Normal case, just means that the guest didn't accept a new
* character before the timeout elapsed. Just retry. */
rc = VINF_SUCCESS;
}
else
{
LogFlow(("NotifyRead failed with %Rrc\n", rc));
break;
}
}
}
return VINF_SUCCESS;
}
/*
* Read from so's socket into sb_snd, updating all relevant sbuf fields
* NOTE: This will only be called if it is select()ed for reading, so
* a read() of 0 (or less) means it's disconnected
*/
int
soread(PNATState pData, struct socket *so)
{
int n, nn, lss, total;
struct sbuf *sb = &so->so_snd;
u_int len = sb->sb_datalen - sb->sb_cc;
struct iovec iov[2];
int mss = so->so_tcpcb->t_maxseg;
int sockerr;
STAM_PROFILE_START(&pData->StatIOread, a);
STAM_COUNTER_RESET(&pData->StatIORead_in_1);
STAM_COUNTER_RESET(&pData->StatIORead_in_2);
QSOCKET_LOCK(tcb);
SOCKET_LOCK(so);
QSOCKET_UNLOCK(tcb);
LogFlow(("soread: so = %R[natsock]\n", so));
Log2(("%s: so = %R[natsock] so->so_snd = %R[sbuf]\n", RT_GCC_EXTENSION __PRETTY_FUNCTION__, so, sb));
/*
* No need to check if there's enough room to read.
* soread wouldn't have been called if there weren't
*/
len = sb->sb_datalen - sb->sb_cc;
iov[0].iov_base = sb->sb_wptr;
iov[1].iov_base = 0;
iov[1].iov_len = 0;
if (sb->sb_wptr < sb->sb_rptr)
{
iov[0].iov_len = sb->sb_rptr - sb->sb_wptr;
/* Should never succeed, but... */
if (iov[0].iov_len > len)
iov[0].iov_len = len;
if (iov[0].iov_len > mss)
iov[0].iov_len -= iov[0].iov_len%mss;
n = 1;
}
else
{
iov[0].iov_len = (sb->sb_data + sb->sb_datalen) - sb->sb_wptr;
/* Should never succeed, but... */
if (iov[0].iov_len > len)
iov[0].iov_len = len;
len -= iov[0].iov_len;
if (len)
{
iov[1].iov_base = sb->sb_data;
iov[1].iov_len = sb->sb_rptr - sb->sb_data;
if (iov[1].iov_len > len)
iov[1].iov_len = len;
total = iov[0].iov_len + iov[1].iov_len;
if (total > mss)
{
lss = total % mss;
if (iov[1].iov_len > lss)
{
iov[1].iov_len -= lss;
n = 2;
}
else
{
lss -= iov[1].iov_len;
iov[0].iov_len -= lss;
n = 1;
}
}
else
n = 2;
}
else
{
if (iov[0].iov_len > mss)
iov[0].iov_len -= iov[0].iov_len%mss;
n = 1;
}
}
#ifdef HAVE_READV
nn = readv(so->s, (struct iovec *)iov, n);
#else
nn = recv(so->s, iov[0].iov_base, iov[0].iov_len, (so->so_tcpcb->t_force? MSG_OOB:0));
#endif
if (nn < 0)
sockerr = errno; /* save it, as it may be clobbered by logging */
else
sockerr = 0;
Log2(("%s: read(1) nn = %d bytes\n", RT_GCC_EXTENSION __PRETTY_FUNCTION__, nn));
Log2(("%s: so = %R[natsock] so->so_snd = %R[sbuf]\n", RT_GCC_EXTENSION __PRETTY_FUNCTION__, so, sb));
if (nn <= 0)
{
#ifdef RT_OS_WINDOWS
/*
* Windows reports ESHUTDOWN after SHUT_RD (SD_RECEIVE)
* instead of just returning EOF indication.
*/
if (nn < 0 && sockerr == ESHUTDOWN)
{
nn = 0;
sockerr = 0;
}
#endif
if (nn == 0) /* XXX: should this be inside #if defined(RT_OS_WINDOWS)? */
{
/*
* Special case for WSAEnumNetworkEvents: If we receive 0 bytes that
* _could_ mean that the connection is closed. But we will receive an
* FD_CLOSE event later if the connection was _really_ closed. With
* www.youtube.com I see this very often. Closing the socket too early
* would be dangerous.
*/
int status;
unsigned long pending = 0;
status = ioctlsocket(so->s, FIONREAD, &pending);
if (status < 0)
Log(("NAT:%s: error in WSAIoctl: %d\n", RT_GCC_EXTENSION __PRETTY_FUNCTION__, errno));
if (pending != 0)
{
SOCKET_UNLOCK(so);
STAM_PROFILE_STOP(&pData->StatIOread, a);
return 0;
}
}
if ( nn < 0
&& soIgnorableErrorCode(sockerr))
{
SOCKET_UNLOCK(so);
STAM_PROFILE_STOP(&pData->StatIOread, a);
return 0;
}
else
{
int fUninitializedTemplate = 0;
int shuterr;
fUninitializedTemplate = RT_BOOL(( sototcpcb(so)
&& ( sototcpcb(so)->t_template.ti_src.s_addr == INADDR_ANY
|| sototcpcb(so)->t_template.ti_dst.s_addr == INADDR_ANY)));
/* nn == 0 means peer has performed an orderly shutdown */
Log2(("%s: disconnected, nn = %d, errno = %d (%s)\n",
RT_GCC_EXTENSION __PRETTY_FUNCTION__, nn, sockerr, strerror(sockerr)));
shuterr = sofcantrcvmore(so);
if (!sockerr && !shuterr && !fUninitializedTemplate)
tcp_sockclosed(pData, sototcpcb(so));
else
{
LogRel2(("NAT: sockerr %d, shuterr %d - %R[natsock]\n", sockerr, shuterr, so));
tcp_drop(pData, sototcpcb(so), sockerr);
}
SOCKET_UNLOCK(so);
STAM_PROFILE_STOP(&pData->StatIOread, a);
return -1;
}
}
STAM_STATS(
if (n == 1)
{
STAM_COUNTER_INC(&pData->StatIORead_in_1);
STAM_COUNTER_ADD(&pData->StatIORead_in_1_bytes, nn);
}
else
{
STAM_COUNTER_INC(&pData->StatIORead_in_2);
STAM_COUNTER_ADD(&pData->StatIORead_in_2_1st_bytes, nn);
}
);
