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SubjectRe: File corruption when running VMware.
On Sat, Apr 27, 2002 at 01:01:34AM +0200, Andrea Arcangeli wrote:
> On Fri, Apr 26, 2002 at 05:30:37PM +0200, Petr Vandrovec wrote:
> > On 24 Apr 02 at 2:01, Rik van Riel wrote:
> > > On Wed, 24 Apr 2002, Hong-Gunn Chew wrote:
> > >
> > > > I have a repeatable problem when running VMware workstation 3.00 and
> > > > 3.01. The cause is still unknown, and could be VMware itself, the
> > > > hardware or the kernel.
> > >
> > > If you can reproduce it without VMware or with only the
> > > open source part of VMware (ie without any of the binary
> > > only parts) we might have a chance of debugging it.
> >
> > Hi again,
> > one of 2.4.x kernel images available in SuSE's 8.0 has patched&enabled
> > support for page tables in high memory, and this quickly revealed
> > incompatibility between VMware's vmmon page table handling and
> > ptes above directly mapped range.
> >
> > So if you have >890MB of RAM and your kernel is compiled with support
> > for pte in high memory, please stop using VMware, or reconfigure your
> > kernel to not use pte in high memory (4GB config without pte-in-highmem
> > is OK). Using pte-in-highmem with vmmon will cause kernel oopses and/or
>
> passing to the kernel mem=850M in lilo at boot will be enough.

I downloaded your latest driver from your site (vmware-ws-any-update16
package) and I adjusted it this way:

--- vmware-ws-any-update16/vmmon-only/linux/hostif.c.~1~ Sun Mar 31 20:44:35 2002
+++ vmware-ws-any-update16/vmmon-only/linux/hostif.c Sat Apr 27 01:12:50 2002
@@ -176,7 +176,7 @@
unsigned long pagenr;
pgd_t *pgd;
pmd_t *pmd;
- pte_t *pte;
+ pte_t *ptep, pte;

pgd = pgd_offset(current->mm, addr);
if (pgd_none(*pgd))
@@ -184,10 +184,12 @@
pmd = pmd_offset(pgd, addr);
if (pmd_none(*pmd))
return 0;
- pte = pte_offset(pmd, addr);
- if (!pte_present(*pte))
+ ptep = pte_offset_atomic(pmd, addr);
+ pte = *ptep;
+ pte_kunmap(ptep);
+ if (!pte_present(pte))
return 0;
- pagenr = pte_pagenr(*pte);
+ pagenr = pte_pagenr(pte);
return pagenr;
#else
int pdoffset = PFN_2_PDOFF(ppn);
--- vmware-ws-any-update16/vmnet-only/vmnetInt.h.~1~ Sat Mar 23 04:27:54 2002
+++ vmware-ws-any-update16/vmnet-only/vmnetInt.h Sat Apr 27 01:16:43 2002
@@ -96,10 +96,8 @@
#endif


-#ifndef KERNEL_2_5_5
-# define pte_offset_map(_dir, _address) pte_offset(_dir, _address)
-# define pte_unmap(_pte)
-#endif
+# define pte_offset_map(_dir, _address) pte_offset_atomic(_dir, _address)
+# define pte_unmap(_pte) pte_kunmap(_pte);


#ifndef KERNEL_2_4_8

I'm running the patched driver right now with vmware 3.0 workstataion
on my main desktop with 1G using 2.4.19-pre7 as kernel (pte-highmem
enabled of course). If I'll find any instability of the host OS I'll let
you know, so far it looks solid.

Hope this helps,

Andrea
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