From: tip-bot for Jason Wang <tipbot@zytor.com>
To: linux-tip-commits@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, hpa@zytor.com, mingo@kernel.org,
jasowang@redhat.com, gleb@redhat.com, pbonzini@redhat.com,
tglx@linutronix.de, hpa@linux.intel.com
Subject: [tip:x86/paravirt] x86, kvm: Switch to use hypervisor_cpuid_base( )
Date: Mon, 5 Aug 2013 06:58:01 -0700 [thread overview]
Message-ID: <tip-1085ba7f552d84aa8ac0ae903fa8d0cc2ff9f79d@git.kernel.org> (raw)
In-Reply-To: <1374742475-2485-3-git-send-email-jasowang@redhat.com>
Commit-ID: 1085ba7f552d84aa8ac0ae903fa8d0cc2ff9f79d
Gitweb: http://git.kernel.org/tip/1085ba7f552d84aa8ac0ae903fa8d0cc2ff9f79d
Author: Jason Wang <jasowang@redhat.com>
AuthorDate: Thu, 25 Jul 2013 16:54:34 +0800
Committer: H. Peter Anvin <hpa@linux.intel.com>
CommitDate: Mon, 5 Aug 2013 06:34:33 -0700
x86, kvm: Switch to use hypervisor_cpuid_base()
Switch to use hypervisor_cpuid_base() to detect KVM.
Cc: Gleb Natapov <gleb@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: http://lkml.kernel.org/r/1374742475-2485-3-git-send-email-jasowang@redhat.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
---
arch/x86/include/asm/kvm_para.h | 24 +++++++++---------------
1 file changed, 9 insertions(+), 15 deletions(-)
diff --git a/arch/x86/include/asm/kvm_para.h b/arch/x86/include/asm/kvm_para.h
index 695399f..0644129 100644
--- a/arch/x86/include/asm/kvm_para.h
+++ b/arch/x86/include/asm/kvm_para.h
@@ -85,26 +85,20 @@ static inline long kvm_hypercall4(unsigned int nr, unsigned long p1,
return ret;
}
-static inline bool kvm_para_available(void)
+static inline uint32_t kvm_cpuid_base(void)
{
- unsigned int eax, ebx, ecx, edx;
- char signature[13];
-
if (boot_cpu_data.cpuid_level < 0)
- return false; /* So we don't blow up on old processors */
+ return 0; /* So we don't blow up on old processors */
- if (cpu_has_hypervisor) {
- cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
- memcpy(signature + 0, &ebx, 4);
- memcpy(signature + 4, &ecx, 4);
- memcpy(signature + 8, &edx, 4);
- signature[12] = 0;
+ if (cpu_has_hypervisor)
+ return hypervisor_cpuid_base("KVMKVMKVM\0\0\0", 0);
- if (strcmp(signature, "KVMKVMKVM") == 0)
- return true;
- }
+ return 0;
+}
- return false;
+static inline bool kvm_para_available(void)
+{
+ return kvm_cpuid_base() != 0;
}
static inline unsigned int kvm_arch_para_features(void)
next prev parent reply other threads:[~2013-08-05 13:58 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-25 8:54 [PATCH V2 1/4] x86: introduce hypervisor_cpuid_base() Jason Wang
2013-07-25 8:54 ` [PATCH V2 2/4] xen: switch to use hypervisor_cpuid_base() Jason Wang
2013-07-25 8:54 ` Jason Wang
2013-08-05 13:57 ` [tip:x86/paravirt] xen: Switch " tip-bot for Jason Wang
2013-07-25 8:54 ` [PATCH V2 3/4] kvm: switch " Jason Wang
2013-08-05 13:58 ` tip-bot for Jason Wang [this message]
2013-07-25 8:54 ` [PATCH V2 4/4] x86: correctly detect hypervisor Jason Wang
2013-07-25 8:54 ` Jason Wang
2013-07-25 10:56 ` KY Srinivasan
2013-07-25 10:56 ` KY Srinivasan
2013-07-25 10:56 ` KY Srinivasan
2013-08-05 3:38 ` Jason Wang
2013-08-05 3:38 ` Jason Wang
2013-08-05 14:34 ` Konrad Rzeszutek Wilk
2013-08-05 14:34 ` Konrad Rzeszutek Wilk
2013-08-05 15:20 ` H. Peter Anvin
2013-08-05 15:20 ` H. Peter Anvin
2013-08-05 16:50 ` Konrad Rzeszutek Wilk
2013-08-05 16:50 ` Konrad Rzeszutek Wilk
2013-08-05 13:58 ` [tip:x86/paravirt] x86: Correctly " tip-bot for Jason Wang
2013-08-05 13:57 ` [tip:x86/paravirt] x86: Introduce hypervisor_cpuid_base() tip-bot for Jason Wang
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