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Date: Fri, 17 Feb 2017 08:36:24 +0100 From: Juergen Gross <jgross@...e.com> To: linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org, x86@...nel.org Cc: boris.ostrovsky@...cle.com, hpa@...or.com, tglx@...utronix.de, mingo@...hat.com, Juergen Gross <jgross@...e.com> Subject: [PATCH 1/2] x86/xen: don't indicate DCA support in pv domains Xen doesn't support DCA (direct cache access) for pv domains. Clear the corresponding capability indicator. Signed-off-by: Juergen Gross <jgross@...e.com> --- arch/x86/xen/enlighten.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c index 51ef952..83399ce 100644 --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -461,6 +461,9 @@ static void __init xen_init_cpuid_mask(void) cpuid_leaf1_ecx_mask &= ~xsave_mask; /* disable XSAVE & OSXSAVE */ if (xen_check_mwait()) cpuid_leaf1_ecx_set_mask = (1 << (X86_FEATURE_MWAIT % 32)); + + /* Disable DCA feature. */ + setup_clear_cpu_cap(X86_FEATURE_DCA); } static void xen_set_debugreg(int reg, unsigned long val) -- 2.10.2
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