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| author | kib <kib@FreeBSD.org> | 2009-10-01 12:52:48 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2009-10-01 12:52:48 +0000 |
| commit | a73674620c7fa1fe443dd9e7532a797292aeb6e1 (patch) | |
| tree | c218591e92ae38710a10254262320d857ac2092a /sys/amd64/amd64/initcpu.c | |
| parent | 6f65ac42775d5a36dd9aa0878ca09ef1e6de660e (diff) | |
| download | FreeBSD-src-a73674620c7fa1fe443dd9e7532a797292aeb6e1.zip FreeBSD-src-a73674620c7fa1fe443dd9e7532a797292aeb6e1.tar.gz | |
As a workaround, for Intel CPUs, do not use CLFLUSH in
pmap_invalidate_cache_range() when self-snoop is apparently not reported
in cpu features. We get a reserved trap when clflushing APIC registers
window.
XEN in full system virtualization mode removes self-snoop from CPU
features, making this a problem.
Tested by: csjp
Reviewed by: alc
MFC after: 3 days
Diffstat (limited to 'sys/amd64/amd64/initcpu.c')
| -rw-r--r-- | sys/amd64/amd64/initcpu.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sys/amd64/amd64/initcpu.c b/sys/amd64/amd64/initcpu.c index 4376dd0..7aaff82 100644 --- a/sys/amd64/amd64/initcpu.c +++ b/sys/amd64/amd64/initcpu.c @@ -165,4 +165,10 @@ initializecpu(void) */ if ((cpu_feature & CPUID_CLFSH) != 0) cpu_clflush_line_size = ((cpu_procinfo >> 8) & 0xff) * 8; + /* + * XXXKIB: (temporary) hack to work around traps generated when + * CLFLUSHing APIC registers window. + */ + if (cpu_vendor_id == CPU_VENDOR_INTEL && !(cpu_feature & CPUID_SS)) + cpu_feature &= ~CPUID_CLFSH; } |
