x86: VMware: Fix vmware_get_tsc code

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Impact: Fix possible failure to calibrate the TSC on Vmware near 4 GHz

The current version of the code to get the tsc frequency from
the VMware hypervisor, will be broken on processor with frequency
(4G-1) HZ, because on such processors eax will have UINT_MAX
and that would be legitimate.
We instead check that EBX did change to decide if we were able to
read the frequency from the hypervisor.

Signed-off-by: Alok N Kataria <akataria@vmware.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

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Alok Kataria 2008-11-03 11:31:28 -08:00 • committed by H. Peter Anvin

parent 395628ef4e

commit 6bdbfe9991

1 changed files with 2 additions and 2 deletions

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arch/x86/kernel/cpu/vmware.c

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