From: Vineeth Pillai <viremana@linux.microsoft.com>
To: Lan Tianyu <Tianyu.Lan@microsoft.com>,
Michael Kelley <mikelley@microsoft.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Wei Liu <wei.liu@kernel.org>,
Stephen Hemminger <sthemmin@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>
Cc: Vineeth Pillai <viremana@linux.microsoft.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"K. Y. Srinivasan" <kys@microsoft.com>,
x86@kernel.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org
Subject: [PATCH v2 1/7] hyperv: Detect Nested virtualization support for SVM
Date: Thu, 15 Apr 2021 13:43:36 +0000 [thread overview]
Message-ID: <9d12558549bc0c6f179b26f5b16c751bdfab3f74.1618492553.git.viremana@linux.microsoft.com> (raw)
In-Reply-To: <cover.1618492553.git.viremana@linux.microsoft.com>
Detect nested features exposed by Hyper-V if SVM is enabled.
Signed-off-by: Vineeth Pillai <viremana@linux.microsoft.com>
---
arch/x86/kernel/cpu/mshyperv.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c
index 3546d3e21787..c6f812851e37 100644
--- a/arch/x86/kernel/cpu/mshyperv.c
+++ b/arch/x86/kernel/cpu/mshyperv.c
@@ -252,6 +252,7 @@ static void __init hv_smp_prepare_cpus(unsigned int max_cpus)
static void __init ms_hyperv_init_platform(void)
{
+ int hv_max_functions_eax;
int hv_host_info_eax;
int hv_host_info_ebx;
int hv_host_info_ecx;
@@ -269,6 +270,8 @@ static void __init ms_hyperv_init_platform(void)
ms_hyperv.misc_features = cpuid_edx(HYPERV_CPUID_FEATURES);
ms_hyperv.hints = cpuid_eax(HYPERV_CPUID_ENLIGHTMENT_INFO);
+ hv_max_functions_eax = cpuid_eax(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS);
+
pr_info("Hyper-V: privilege flags low 0x%x, high 0x%x, hints 0x%x, misc 0x%x\n",
ms_hyperv.features, ms_hyperv.priv_high, ms_hyperv.hints,
ms_hyperv.misc_features);
@@ -298,8 +301,7 @@ static void __init ms_hyperv_init_platform(void)
/*
* Extract host information.
*/
- if (cpuid_eax(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS) >=
- HYPERV_CPUID_VERSION) {
+ if (hv_max_functions_eax >= HYPERV_CPUID_VERSION) {
hv_host_info_eax = cpuid_eax(HYPERV_CPUID_VERSION);
hv_host_info_ebx = cpuid_ebx(HYPERV_CPUID_VERSION);
hv_host_info_ecx = cpuid_ecx(HYPERV_CPUID_VERSION);
@@ -325,9 +327,11 @@ static void __init ms_hyperv_init_platform(void)
ms_hyperv.isolation_config_a, ms_hyperv.isolation_config_b);
}
- if (ms_hyperv.hints & HV_X64_ENLIGHTENED_VMCS_RECOMMENDED) {
+ if (hv_max_functions_eax >= HYPERV_CPUID_NESTED_FEATURES) {
ms_hyperv.nested_features =
cpuid_eax(HYPERV_CPUID_NESTED_FEATURES);
+ pr_info("Hyper-V: Nested features: 0x%x\n",
+ ms_hyperv.nested_features);
}
/*
--
2.25.1
next prev parent reply other threads:[~2021-04-15 13:44 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-15 13:43 [PATCH v2 0/7] Hyper-V nested virt enlightenments for SVM Vineeth Pillai
2021-04-15 13:43 ` Vineeth Pillai [this message]
2021-04-16 8:26 ` [PATCH v2 1/7] hyperv: Detect Nested virtualization support " Vitaly Kuznetsov
2021-04-16 16:10 ` Vineeth Pillai
2021-04-15 13:43 ` [PATCH v2 2/7] hyperv: SVM enlightened TLB flush support flag Vineeth Pillai
2021-04-21 10:00 ` Wei Liu
2021-04-21 11:15 ` Vineeth Pillai
2021-04-21 13:20 ` Wei Liu
2021-04-15 13:43 ` [PATCH v2 3/7] KVM: x86: hyper-v: Move the remote TLB flush logic out of vmx Vineeth Pillai
2021-04-16 8:36 ` Vitaly Kuznetsov
2021-04-16 8:40 ` Paolo Bonzini
2021-04-16 16:39 ` Vineeth Pillai
2021-04-20 15:57 ` Vitaly Kuznetsov
2021-04-15 13:43 ` [PATCH v2 4/7] KVM: SVM: hyper-v: Nested enlightenments in VMCB Vineeth Pillai
2021-04-16 8:58 ` Vitaly Kuznetsov
2021-04-16 17:07 ` Vineeth Pillai
2021-04-15 13:43 ` [PATCH v2 5/7] KVM: SVM: hyper-v: Remote TLB flush for SVM Vineeth Pillai
2021-04-16 9:04 ` Vitaly Kuznetsov
2021-04-16 17:26 ` Vineeth Pillai
2021-04-21 14:03 ` Vineeth Pillai
2021-04-15 13:43 ` [PATCH v2 6/7] KVM: SVM: hyper-v: Enlightened MSR-Bitmap support Vineeth Pillai
2021-04-15 13:43 ` [PATCH v2 7/7] KVM: SVM: hyper-v: Direct Virtual Flush support Vineeth Pillai
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