diff options
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/i386 | |
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/i386')
-rw-r--r-- | sys/i386/i386/initcpu.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sys/i386/i386/initcpu.c b/sys/i386/i386/initcpu.c index 1ecff1c..dc8da0b 100644 --- a/sys/i386/i386/initcpu.c +++ b/sys/i386/i386/initcpu.c @@ -717,6 +717,12 @@ 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; #if defined(PC98) && !defined(CPU_UPGRADE_HW_CACHE) /* |