From: shuo.a.liu@intel.com
To: linux-kernel@vger.kernel.org, x86@kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"H . Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Yu Wang <yu1.wang@intel.com>,
Reinette Chatre <reinette.chatre@intel.com>,
Yin Fengwei <fengwei.yin@intel.com>,
Shuo Liu <shuo.a.liu@intel.com>, Borislav Petkov <bp@suse.de>,
Dave Hansen <dave.hansen@intel.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Dan Williams <dan.j.williams@intel.com>,
Zhi Wang <zhi.a.wang@intel.com>,
Zhenyu Wang <zhenyuw@linux.intel.com>
Subject: [PATCH v7 03/18] x86/acrn: Introduce acrn_cpuid_base() and hypervisor feature bits
Date: Wed, 6 Jan 2021 15:50:40 +0800 [thread overview]
Message-ID: <20210106075055.47226-4-shuo.a.liu@intel.com> (raw)
In-Reply-To: <20210106075055.47226-1-shuo.a.liu@intel.com>
From: Yin Fengwei <fengwei.yin@intel.com>
ACRN Hypervisor reports hypervisor features via CPUID leaf 0x40000001
which is similar to KVM. A VM can check if it's the privileged VM using
the feature bits. The Service VM is the only privileged VM by design.
Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
Signed-off-by: Shuo Liu <shuo.a.liu@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Acked-by: Borislav Petkov <bp@suse.de>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Fengwei Yin <fengwei.yin@intel.com>
Cc: Zhi Wang <zhi.a.wang@intel.com>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Yu Wang <yu1.wang@intel.com>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/x86/include/asm/acrn.h | 16 ++++++++++++++++
arch/x86/kernel/cpu/acrn.c | 2 +-
2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/acrn.h b/arch/x86/include/asm/acrn.h
index ff259b69cde7..127f20672c5d 100644
--- a/arch/x86/include/asm/acrn.h
+++ b/arch/x86/include/asm/acrn.h
@@ -2,7 +2,23 @@
#ifndef _ASM_X86_ACRN_H
#define _ASM_X86_ACRN_H
+/*
+ * This CPUID returns feature bitmaps in EAX.
+ * Guest VM uses this to detect the appropriate feature bit.
+ */
+#define ACRN_CPUID_FEATURES 0x40000001
+/* Bit 0 indicates whether guest VM is privileged */
+#define ACRN_FEATURE_PRIVILEGED_VM BIT(0)
+
void acrn_setup_intr_handler(void (*handler)(void));
void acrn_remove_intr_handler(void);
+static inline u32 acrn_cpuid_base(void)
+{
+ if (boot_cpu_has(X86_FEATURE_HYPERVISOR))
+ return hypervisor_cpuid_base("ACRNACRNACRN", 0);
+
+ return 0;
+}
+
#endif /* _ASM_X86_ACRN_H */
diff --git a/arch/x86/kernel/cpu/acrn.c b/arch/x86/kernel/cpu/acrn.c
index e0c181781905..23f5f27b5a02 100644
--- a/arch/x86/kernel/cpu/acrn.c
+++ b/arch/x86/kernel/cpu/acrn.c
@@ -21,7 +21,7 @@
static u32 __init acrn_detect(void)
{
- return hypervisor_cpuid_base("ACRNACRNACRN", 0);
+ return acrn_cpuid_base();
}
static void __init acrn_init_platform(void)
--
2.28.0
next prev parent reply other threads:[~2021-01-06 7:52 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-06 7:50 [PATCH v7 00/18] HSM driver for ACRN hypervisor shuo.a.liu
2021-01-06 7:50 ` [PATCH v7 01/18] docs: acrn: Introduce ACRN shuo.a.liu
2021-01-18 22:30 ` Randy Dunlap
2021-01-19 1:36 ` Shuo A Liu
2021-01-06 7:50 ` [PATCH v7 02/18] x86/acrn: Introduce acrn_{setup, remove}_intr_handler() shuo.a.liu
2021-01-06 7:50 ` shuo.a.liu [this message]
2021-01-06 7:50 ` [PATCH v7 04/18] x86/acrn: Introduce hypercall interfaces shuo.a.liu
2021-01-06 7:50 ` [PATCH v7 05/18] virt: acrn: Introduce ACRN HSM basic driver shuo.a.liu
2021-01-06 7:50 ` [PATCH v7 06/18] virt: acrn: Introduce VM management interfaces shuo.a.liu
2021-01-08 15:31 ` Greg Kroah-Hartman
2021-01-11 3:55 ` Shuo A Liu
2021-01-06 7:50 ` [PATCH v7 07/18] virt: acrn: Introduce an ioctl to set vCPU registers state shuo.a.liu
2021-01-08 15:33 ` Greg Kroah-Hartman
2021-01-11 3:59 ` Shuo A Liu
2021-01-06 7:50 ` [PATCH v7 08/18] virt: acrn: Introduce EPT mapping management shuo.a.liu
2021-01-08 15:34 ` Greg Kroah-Hartman
2021-01-11 4:03 ` Shuo A Liu
2021-01-06 7:50 ` [PATCH v7 09/18] virt: acrn: Introduce I/O request management shuo.a.liu
2021-01-11 21:52 ` Davidlohr Bueso
2021-01-12 6:05 ` Shuo A Liu
2021-01-12 17:29 ` Davidlohr Bueso
2021-01-06 7:50 ` [PATCH v7 10/18] virt: acrn: Introduce PCI configuration space PIO accesses combiner shuo.a.liu
2021-01-06 7:50 ` [PATCH v7 11/18] virt: acrn: Introduce interfaces for PCI device passthrough shuo.a.liu
2021-01-06 7:50 ` [PATCH v7 12/18] virt: acrn: Introduce interrupt injection interfaces shuo.a.liu
2021-01-06 7:50 ` [PATCH v7 13/18] virt: acrn: Introduce interfaces to query C-states and P-states allowed by hypervisor shuo.a.liu
2021-01-06 7:50 ` [PATCH v7 14/18] virt: acrn: Introduce I/O ranges operation interfaces shuo.a.liu
2021-01-06 7:50 ` [PATCH v7 15/18] virt: acrn: Introduce ioeventfd shuo.a.liu
2021-01-06 7:50 ` [PATCH v7 16/18] virt: acrn: Introduce irqfd shuo.a.liu
2021-01-06 7:50 ` [PATCH v7 17/18] virt: acrn: Introduce an interface for Service VM to control vCPU shuo.a.liu
2021-01-06 7:50 ` [PATCH v7 18/18] sample/acrn: Introduce a sample of HSM ioctl interface usage shuo.a.liu
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