[Xen-devel] [PATCH 1/2] x86/xen: don't indicate DCA support in pv domains

[Juergen Gross <jgross@xxxxxxxx>]

Xen doesn't support DCA (direct cache access) for pv domains. Clear
the corresponding capability indicator.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 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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