search for: x86_feature_arat

Displaying 2 results from an estimated 2 matches for "x86_feature_arat".

2011 Feb 10
4
[PATCH] x86: suppress HPET broadcast initialization in the presence of ARAT
...d be forced off in this case (rather than leaving whatever came from firmware). Signed-off-by: Jan Beulich <jbeulich@novell.com> --- a/xen/arch/x86/hpet.c +++ b/xen/arch/x86/hpet.c @@ -557,6 +557,9 @@ void hpet_broadcast_init(void) u32 hpet_id, cfg; int i; + if ( boot_cpu_has(X86_FEATURE_ARAT) ) + return; + if ( irq_channel == NULL ) { irq_channel = xmalloc_array(int, nr_irqs); _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
2013 Jan 17
0
[PATCH v2] AMD: Enable WC+ memory type on family 10 processors
...ris Ostrovsky <boris.ostrovsky@amd.com> diff -r b6195e277da5 -r 40881d58e991 xen/arch/x86/cpu/amd.c --- a/xen/arch/x86/cpu/amd.c Wed Jan 16 14:15:44 2013 +0000 +++ b/xen/arch/x86/cpu/amd.c Thu Jan 17 14:47:04 2013 -0500 @@ -495,6 +495,18 @@ static void __devinit init_amd(struct cp set_bit(X86_FEATURE_ARAT, c->x86_capability); /* + * On family 10h BIOS may not have properly enabled WC+ support, causing + * it to be converted to CD memtype. This may result in performance + * degradation for certain nested-paging guests. Prevent this conversion + * by clearing bit 24 in MSR_F10_BU_CFG2. + *...