From: Zhenzhong Duan <zhenzhong.duan@oracle.com>
To: linux-kernel@vger.kernel.org
Cc: x86@kernel.org, Zhenzhong Duan <zhenzhong.duan@oracle.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Juergen Gross <jgross@suse.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: [PATCH] x86/speculation/mds: Apply more accurate check on hypervisor platform
Date: Thu, 25 Jul 2019 10:39:09 +0800 [thread overview]
Message-ID: <1564022349-17338-1-git-send-email-zhenzhong.duan@oracle.com> (raw)
X86_HYPER_NATIVE isn't accurate for checking if running on native
platform, e.g. CONFIG_HYPERVISOR_GUEST isn't set or "nopv" is enabled.
Checking cpu flag X86_FEATURE_HYPERVISOR to determine if it's running
on native platform is more accurate.
This still doesn't consider the old platform where even
X86_FEATURE_HYPERVISOR is unsupported, e.g. vmware.
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Juergen Gross <jgross@suse.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
---
arch/x86/kernel/cpu/bugs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index 66ca906..801ecd1 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -1226,7 +1226,7 @@ static ssize_t l1tf_show_state(char *buf)
static ssize_t mds_show_state(char *buf)
{
- if (!hypervisor_is_type(X86_HYPER_NATIVE)) {
+ if (boot_cpu_has(X86_FEATURE_HYPERVISOR)) {
return sprintf(buf, "%s; SMT Host state unknown\n",
mds_strings[mds_mitigation]);
}
--
1.8.3.1
next reply other threads:[~2019-07-25 2:39 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-25 2:39 Zhenzhong Duan [this message]
2019-07-25 10:55 ` [tip:x86/urgent] x86/speculation/mds: Apply more accurate check on hypervisor platform tip-bot for Zhenzhong Duan
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