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authorWei Liu <wei.liu@kernel.org>2021-02-03 15:04:21 +0000
committerWei Liu <wei.liu@kernel.org>2021-02-11 08:47:05 +0000
commite997720202b363ba8000d769f114e3c2c5822227 (patch)
tree228aa21a4d103b3a22408103852b6f9f6da9a8b5 /arch/x86/include
parent8f1d14cb835672cd27f6533f22f4c73e60a30727 (diff)
downloadlinux-e997720202b363ba8000d769f114e3c2c5822227.tar.gz
x86/hyperv: detect if Linux is the root partition
For now we can use the privilege flag to check. Stash the value to be used later. Put in a bunch of defines for future use when we want to have more fine-grained detection. Signed-off-by: Wei Liu <wei.liu@kernel.org> Reviewed-by: Pavel Tatashin <pasha.tatashin@soleen.com> Reviewed-by: Michael Kelley <mikelley@microsoft.com> Link: https://lore.kernel.org/r/20210203150435.27941-3-wei.liu@kernel.org
Diffstat (limited to 'arch/x86/include')
-rw-r--r--arch/x86/include/asm/hyperv-tlfs.h10
-rw-r--r--arch/x86/include/asm/mshyperv.h2
2 files changed, 12 insertions, 0 deletions
diff --git a/arch/x86/include/asm/hyperv-tlfs.h b/arch/x86/include/asm/hyperv-tlfs.h
index 6aed936e5e96..e3a6a723d661 100644
--- a/arch/x86/include/asm/hyperv-tlfs.h
+++ b/arch/x86/include/asm/hyperv-tlfs.h
@@ -21,6 +21,7 @@
#define HYPERV_CPUID_FEATURES 0x40000003
#define HYPERV_CPUID_ENLIGHTMENT_INFO 0x40000004
#define HYPERV_CPUID_IMPLEMENT_LIMITS 0x40000005
+#define HYPERV_CPUID_CPU_MANAGEMENT_FEATURES 0x40000007
#define HYPERV_CPUID_NESTED_FEATURES 0x4000000A
#define HYPERV_CPUID_ISOLATION_CONFIG 0x4000000C
@@ -112,6 +113,15 @@
#define HV_X64_ENLIGHTENED_VMCS_RECOMMENDED BIT(14)
/*
+ * CPU management features identification.
+ * These are HYPERV_CPUID_CPU_MANAGEMENT_FEATURES.EAX bits.
+ */
+#define HV_X64_START_LOGICAL_PROCESSOR BIT(0)
+#define HV_X64_CREATE_ROOT_VIRTUAL_PROCESSOR BIT(1)
+#define HV_X64_PERFORMANCE_COUNTER_SYNC BIT(2)
+#define HV_X64_RESERVED_IDENTITY_BIT BIT(31)
+
+/*
* Virtual processor will never share a physical core with another virtual
* processor, except for virtual processors that are reported as sibling SMT
* threads.
diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h
index 30f76b966857..4014a1ca2fae 100644
--- a/arch/x86/include/asm/mshyperv.h
+++ b/arch/x86/include/asm/mshyperv.h
@@ -239,6 +239,8 @@ int hyperv_fill_flush_guest_mapping_list(
struct hv_guest_mapping_flush_list *flush,
u64 start_gfn, u64 end_gfn);
+extern bool hv_root_partition;
+
#ifdef CONFIG_X86_64
void hv_apic_init(void);
void __init hv_init_spinlocks(void);