From: Tianyu Lan <tiala@xxxxxxxxxxxxx> Introduce static key isolation_type_en_snp for enlightened guest check and add some specific options in ms_hyperv_init_ platform(). Signed-off-by: Tianyu Lan <tiala@xxxxxxxxxxxxx> --- arch/x86/hyperv/ivm.c | 12 +++++++++++- arch/x86/include/asm/mshyperv.h | 2 ++ arch/x86/kernel/cpu/mshyperv.c | 29 ++++++++++++++++++++++++----- drivers/hv/hv_common.c | 7 +++++++ 4 files changed, 44 insertions(+), 6 deletions(-) diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c index 1dbcbd9da74d..e9c30dad3419 100644 --- a/arch/x86/hyperv/ivm.c +++ b/arch/x86/hyperv/ivm.c @@ -259,10 +259,20 @@ bool hv_is_isolation_supported(void) } DEFINE_STATIC_KEY_FALSE(isolation_type_snp); +DEFINE_STATIC_KEY_FALSE(isolation_type_en_snp); + +/* + * hv_isolation_type_en_snp - Check system runs in the AMD SEV-SNP based + * isolation enlightened VM. + */ +bool hv_isolation_type_en_snp(void) +{ + return static_branch_unlikely(&isolation_type_en_snp); +} /* * hv_isolation_type_snp - Check system runs in the AMD SEV-SNP based - * isolation VM. + * isolation VM with vTOM support. */ bool hv_isolation_type_snp(void) { diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyperv.h index 61f0c206bff0..9b8c3f638845 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -14,6 +14,7 @@ union hv_ghcb; DECLARE_STATIC_KEY_FALSE(isolation_type_snp); +DECLARE_STATIC_KEY_FALSE(isolation_type_en_snp); typedef int (*hyperv_fill_flush_list_func)( struct hv_guest_mapping_flush_list *flush, @@ -32,6 +33,7 @@ extern u64 hv_current_partition_id; extern union hv_ghcb * __percpu *hv_ghcb_pg; +extern bool hv_isolation_type_en_snp(void); int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages); int hv_call_add_logical_proc(int node, u32 lp_index, u32 acpi_id); int hv_call_create_vp(int node, u64 partition_id, u32 vp_index, u32 flags); diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 831613959a92..2ea4f21c6172 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -273,6 +273,21 @@ 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); + /* + * Add custom configuration for SEV-SNP Enlightened guest + */ + if (cc_platform_has(CC_ATTR_GUEST_SEV_SNP)) { + ms_hyperv.features |= HV_ACCESS_FREQUENCY_MSRS; + ms_hyperv.misc_features |= HV_FEATURE_FREQUENCY_MSRS_AVAILABLE; + ms_hyperv.misc_features &= ~HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE; + ms_hyperv.hints |= HV_DEPRECATING_AEOI_RECOMMENDED; + ms_hyperv.hints |= HV_X64_APIC_ACCESS_RECOMMENDED; + ms_hyperv.hints |= HV_X64_CLUSTER_IPI_RECOMMENDED; + } + + pr_info("Hyper-V: enlightment features 0x%x, hints 0x%x, misc 0x%x\n", + ms_hyperv.features, ms_hyperv.hints, ms_hyperv.misc_features); + 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", @@ -328,18 +343,22 @@ static void __init ms_hyperv_init_platform(void) ms_hyperv.shared_gpa_boundary = BIT_ULL(ms_hyperv.shared_gpa_boundary_bits); - pr_info("Hyper-V: Isolation Config: Group A 0x%x, Group B 0x%x\n", - ms_hyperv.isolation_config_a, ms_hyperv.isolation_config_b); - - if (hv_get_isolation_type() == HV_ISOLATION_TYPE_SNP) { + if (cc_platform_has(CC_ATTR_GUEST_SEV_SNP)) { + static_branch_enable(&isolation_type_en_snp); + } else if (hv_get_isolation_type() == HV_ISOLATION_TYPE_SNP) { static_branch_enable(&isolation_type_snp); #ifdef CONFIG_SWIOTLB swiotlb_unencrypted_base = ms_hyperv.shared_gpa_boundary; #endif } + + pr_info("Hyper-V: Isolation Config: Group A 0x%x, Group B 0x%x\n", + ms_hyperv.isolation_config_a, ms_hyperv.isolation_config_b); + /* Isolation VMs are unenlightened SEV-based VMs, thus this check: */ if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) { - if (hv_get_isolation_type() != HV_ISOLATION_TYPE_NONE) + if (hv_get_isolation_type() != HV_ISOLATION_TYPE_NONE + && !cc_platform_has(CC_ATTR_GUEST_SEV_SNP)) cc_set_vendor(CC_VENDOR_HYPERV); } } diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c index ae68298c0dca..2c6602571c47 100644 --- a/drivers/hv/hv_common.c +++ b/drivers/hv/hv_common.c @@ -268,6 +268,13 @@ bool __weak hv_isolation_type_snp(void) } EXPORT_SYMBOL_GPL(hv_isolation_type_snp); +bool __weak hv_isolation_type_en_snp(void) +{ + return false; +} +EXPORT_SYMBOL_GPL(hv_isolation_type_en_snp); + + void __weak hv_setup_vmbus_handler(void (*handler)(void)) { } -- 2.25.1