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| author | alc <alc@FreeBSD.org> | 2010-02-27 18:00:57 +0000 |
|---|---|---|
| committer | alc <alc@FreeBSD.org> | 2010-02-27 18:00:57 +0000 |
| commit | 83149d5d10417a7749818290fc67c6b1c178ce0a (patch) | |
| tree | eb53149f310d543b56a8e0ae7af18109232c21e4 /sys/kern/subr_param.c | |
| parent | d828528c4c0fe2bb6a99b6f2d8f4014e2592350b (diff) | |
| download | FreeBSD-src-83149d5d10417a7749818290fc67c6b1c178ce0a.zip FreeBSD-src-83149d5d10417a7749818290fc67c6b1c178ce0a.tar.gz | |
When running as a guest operating system, the FreeBSD kernel must assume
that the virtual machine monitor has enabled machine check exceptions.
Unfortunately, on AMD Family 10h processors the machine check hardware
has a bug (Erratum 383) that can result in a false machine check exception
when a superpage promotion occurs. Thus, I am disabling superpage
promotion when the FreeBSD kernel is running as a guest operating system
on an AMD Family 10h processor.
Reviewed by: jhb, kib
MFC after: 3 days
Diffstat (limited to 'sys/kern/subr_param.c')
| -rw-r--r-- | sys/kern/subr_param.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/sys/kern/subr_param.c b/sys/kern/subr_param.c index 1504a78..a4d4ff8 100644 --- a/sys/kern/subr_param.c +++ b/sys/kern/subr_param.c @@ -74,10 +74,6 @@ __FBSDID("$FreeBSD$"); #define MAXFILES (maxproc * 2) #endif -/* Values of enum VM_GUEST members are used as indices in - * vm_guest_sysctl_names */ -enum VM_GUEST { VM_GUEST_NO = 0, VM_GUEST_VM, VM_GUEST_XEN }; - static int sysctl_kern_vm_guest(SYSCTL_HANDLER_ARGS); int hz; @@ -137,6 +133,10 @@ SYSCTL_PROC(_kern, OID_AUTO, vm_guest, CTLFLAG_RD | CTLTYPE_STRING, */ struct buf *swbuf; +/* + * The elements of this array are ordered based upon the values of the + * corresponding enum VM_GUEST members. + */ static const char *const vm_guest_sysctl_names[] = { "none", "generic", |
