Commit 8cac5179 authored by Stanislav Kinsburskii's avatar Stanislav Kinsburskii Committed by Wei Liu
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x86/mshyperv: Add support for extended Hyper-V features 



Extend the "ms_hyperv_info" structure to include a new field,
"ext_features", for capturing extended Hyper-V features.
Update the "ms_hyperv_init_platform" function to retrieve these features
using the cpuid instruction and include them in the informational output.

Signed-off-by: default avatarStanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Signed-off-by: default avatarNuno Das Neves <nunodasneves@linux.microsoft.com>
Reviewed-by: default avatarEaswar Hariharan <eahariha@linux.microsoft.com>
Reviewed-by: default avatarRoman Kisel <romank@linux.microsoft.com>
Reviewed-by: default avatarTianyu Lan <tiala@microsoft.com>
Reviewed-by: default avatarMichael Kelley <mhklinux@outlook.com>
Link: https://lore.kernel.org/r/1741980536-3865-3-git-send-email-nunodasneves@linux.microsoft.com


Signed-off-by: default avatarWei Liu <wei.liu@kernel.org>
Message-ID: <1741980536-3865-3-git-send-email-nunodasneves@linux.microsoft.com>
parent 3817854b

arch/x86/kernel/cpu/mshyperv.c

+4 −2
Original line number Diff line number Diff line
@@ -434,13 +434,15 @@ static void __init ms_hyperv_init_platform(void) 
	 */

	ms_hyperv.features = cpuid_eax(HYPERV_CPUID_FEATURES);

	ms_hyperv.priv_high = cpuid_ebx(HYPERV_CPUID_FEATURES);

	ms_hyperv.ext_features = cpuid_ecx(HYPERV_CPUID_FEATURES);

	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,

	pr_info("Hyper-V: privilege flags low %#x, high %#x, ext %#x, hints %#x, misc %#x\n",

		ms_hyperv.features, ms_hyperv.priv_high,

		ms_hyperv.ext_features, ms_hyperv.hints,

		ms_hyperv.misc_features);



	ms_hyperv.max_vp_index = cpuid_eax(HYPERV_CPUID_IMPLEMENT_LIMITS);

include/asm-generic/mshyperv.h

+1 −0
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ enum hv_partition_type { 
struct ms_hyperv_info {

	u32 features;

	u32 priv_high;

	u32 ext_features;

	u32 misc_features;

	u32 hints;

	u32 nested_features;