From: Juergen Gross <jgross@suse.com>
To: linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org,
x86@kernel.org
Cc: Juergen Gross <jgross@suse.com>,
boris.ostrovsky@oracle.com, mingo@redhat.com, tglx@linutronix.de,
hpa@zytor.com
Subject: [PATCH 1/2] x86/xen: don't indicate DCA support in pv domains
Date: Fri, 17 Feb 2017 08:36:24 +0100 [thread overview]
Message-ID: <20170217073625.13418-2-jgross__5322.86286256767$1487317055$gmane$org@suse.com> (raw)
In-Reply-To: <20170217073625.13418-1-jgross@suse.com>
Xen doesn't support DCA (direct cache access) for pv domains. Clear
the corresponding capability indicator.
Signed-off-by: Juergen Gross <jgross@suse.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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next prev parent reply other threads:[~2017-02-17 7:36 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-17 7:36 [PATCH 0/2] x86/xen: cpuid() cleanup Juergen Gross
2017-02-17 7:36 ` Juergen Gross
2017-02-17 7:36 ` Juergen Gross [this message]
2017-02-17 7:36 ` [PATCH 1/2] x86/xen: don't indicate DCA support in pv domains Juergen Gross
2017-02-17 7:36 ` [PATCH 2/2] x86/xen: use capabilities instead of fake cpuid values Juergen Gross
2017-02-17 14:05 ` Boris Ostrovsky
2017-02-17 14:19 ` Juergen Gross
2017-02-17 14:19 ` Juergen Gross
2017-02-17 14:30 ` Boris Ostrovsky
2017-02-17 14:30 ` Boris Ostrovsky
2017-02-17 14:43 ` Juergen Gross
2017-02-17 14:43 ` Juergen Gross
2017-02-17 14:05 ` Boris Ostrovsky
2017-02-17 7:36 ` Juergen Gross
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