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Signed-off-by: Tianyu Lan Reviewed-by: Michael Kelley --- arch/x86/hyperv/ivm.c | 11 +++++++++++ arch/x86/include/asm/mshyperv.h | 3 +++ arch/x86/kernel/cpu/mshyperv.c | 9 +++++++-- drivers/hv/hv_common.c | 6 ++++++ include/asm-generic/mshyperv.h | 12 +++++++++--- 5 files changed, 36 insertions(+), 5 deletions(-) diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c index 14f46ad2ca64..b2b5cb19fac9 100644 --- a/arch/x86/hyperv/ivm.c +++ b/arch/x86/hyperv/ivm.c @@ -413,3 +413,14 @@ bool hv_isolation_type_snp(void) { return static_branch_unlikely(&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); +} + diff --git a/arch/x86/include/asm/mshyperv.h b/arch/x86/include/asm/mshyper= v.h index 88d9ef98e087..2fa38e9f6207 100644 --- a/arch/x86/include/asm/mshyperv.h +++ b/arch/x86/include/asm/mshyperv.h @@ -26,6 +26,7 @@ union hv_ghcb; =20 DECLARE_STATIC_KEY_FALSE(isolation_type_snp); +DECLARE_STATIC_KEY_FALSE(isolation_type_en_snp); =20 typedef int (*hyperv_fill_flush_list_func)( struct hv_guest_mapping_flush_list *flush, @@ -45,6 +46,8 @@ extern void *hv_hypercall_pg; =20 extern u64 hv_current_partition_id; =20 +extern bool hv_isolation_type_en_snp(void); + extern union hv_ghcb * __percpu *hv_ghcb_pg; =20 int hv_call_deposit_pages(int node, u64 partition_id, u32 num_pages); diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index c7969e806c64..5398fb2f4d39 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -402,8 +402,12 @@ static void __init ms_hyperv_init_platform(void) 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); =20 - if (hv_get_isolation_type() =3D=3D 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() =3D=3D HV_ISOLATION_TYPE_SNP) { static_branch_enable(&isolation_type_snp); + } } =20 if (hv_max_functions_eax >=3D HYPERV_CPUID_NESTED_FEATURES) { @@ -473,7 +477,8 @@ static void __init ms_hyperv_init_platform(void) =20 #if IS_ENABLED(CONFIG_HYPERV) if ((hv_get_isolation_type() =3D=3D HV_ISOLATION_TYPE_VBS) || - (hv_get_isolation_type() =3D=3D HV_ISOLATION_TYPE_SNP)) + ((hv_get_isolation_type() =3D=3D HV_ISOLATION_TYPE_SNP) && + ms_hyperv.paravisor_present)) hv_vtom_init(); /* * Setup the hook to get control post apic initialization. diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c index 542a1d53b303..4b4aa53c34c2 100644 --- a/drivers/hv/hv_common.c +++ b/drivers/hv/hv_common.c @@ -502,6 +502,12 @@ bool __weak hv_isolation_type_snp(void) } EXPORT_SYMBOL_GPL(hv_isolation_type_snp); =20 +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)) { } diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index 402a8c1c202d..6b5c41f90398 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -36,15 +36,21 @@ struct ms_hyperv_info { u32 nested_features; u32 max_vp_index; u32 max_lp_index; - u32 isolation_config_a; + union { + u32 isolation_config_a; + struct { + u32 paravisor_present : 1; + u32 reserved_a1 : 31; + }; + }; union { u32 isolation_config_b; struct { u32 cvm_type : 4; - u32 reserved1 : 1; + u32 reserved_b1 : 1; u32 shared_gpa_boundary_active : 1; u32 shared_gpa_boundary_bits : 6; - u32 reserved2 : 20; + u32 reserved_b2 : 20; }; }; u64 shared_gpa_boundary; --=20 2.25.1