https://bugs.freedesktop.org/show_bug.cgi?id=87913
Bug ID: 87913
Summary: CPU cacheline size of 0 can be returned by CPUID leaf
0x80000006 in some virtual machines
Product: Mesa
Version: unspecified
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: major
Priority: medium
Component: Other
Assignee: mesa-dev@lists.freedesktop.org
Reporter: leonid.sh...@ravellosystems.com
In some recent commercial virtual machine environments cache line of 0 was
actually spotted and that resulted in panics and failures of GDM to initialize
leading to the SAD SCREEN.
The code used to provide default nonzero cache line size should be also used in
case when CPU cache line size is extracted from CPUID leaf 0x80000006.
The following correction is suggested:
src/gallium/auxiliary/util/u_cpu_detect.c:
...
void
util_cpu_detect(void)
if (regs[0] >= 0x80000006) {
cpuid(0x80000006, regs2);
+ if (cacheline > 0)
util_cpu_caps.cacheline = regs2[2] & 0xFF;
}
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