| commit | 6bdbfe99916398dbb28d83833cc04757110f2738 | |
| author | Alok Kataria <akataria@vmware.com> | |
| Mon, 3 Nov 2008 19:31:28 +0000 (3 11:31 -0800) | ||
| committer | H. Peter Anvin <hpa@zytor.com> | |
| Mon, 3 Nov 2008 19:35:57 +0000 (3 11:35 -0800) | ||
| tree | 7783c666ff16ce70022946c070dd058ae2a74989 | treesnapshot (tar.gz zip) |
| parent | 395628ef4ea12ff0748099f145363b5e33c69acb | commitdiff |
x86: VMware: Fix vmware_get_tsc code
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>
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>
| arch/x86/kernel/cpu/vmware.c | diffblobblamehistory |