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x86/hyperv: Add sev-snp enlightened guest static key

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Introduce static key isolation_type_en_snp for enlightened
sev-snp guest check.

Reviewed-by: Dexuan Cui <decui@microsoft.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Tianyu Lan <tiala@microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Link: https://lore.kernel.org/r/20230818102919.1318039-2-ltykernel@gmail.com
This commit is contained in:
Tianyu Lan 2023-08-18 06:29:11 -04:00 committed by Wei Liu
parent 4f74fb30ea
commit d6e2d65244
5 changed files with 36 additions and 5 deletions
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11
arch/x86/hyperv/ivm.c
View File

@ -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);
}

2
arch/x86/include/asm/mshyperv.h
View File

@ -26,6 +26,7 @@
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,
@ -239,6 +240,7 @@ static inline void hv_vtom_init(void) {}
#endif
extern bool hv_isolation_type_snp(void);
extern bool hv_isolation_type_en_snp(void);
static inline bool hv_is_synic_reg(unsigned int reg)
{

9
arch/x86/kernel/cpu/mshyperv.c
View File

@ -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);
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);
}
}
if (hv_max_functions_eax >= HYPERV_CPUID_NESTED_FEATURES) {
@ -473,7 +477,8 @@ static void __init ms_hyperv_init_platform(void)
#if IS_ENABLED(CONFIG_HYPERV)
if ((hv_get_isolation_type() == HV_ISOLATION_TYPE_VBS) ||
(hv_get_isolation_type() == HV_ISOLATION_TYPE_SNP))
((hv_get_isolation_type() == HV_ISOLATION_TYPE_SNP) &&
ms_hyperv.paravisor_present))
hv_vtom_init();
/*
* Setup the hook to get control post apic initialization.

6
drivers/hv/hv_common.c
View File

@ -502,6 +502,12 @@ 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))
{
}

13
include/asm-generic/mshyperv.h
View File

@ -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;
@ -58,6 +64,7 @@ extern void * __percpu *hyperv_pcpu_output_arg;
extern u64 hv_do_hypercall(u64 control, void *inputaddr, void *outputaddr);
extern u64 hv_do_fast_hypercall8(u16 control, u64 input8);
extern bool hv_isolation_type_snp(void);
extern bool hv_isolation_type_en_snp(void);
/* Helper functions that provide a consistent pattern for checking Hyper-V hypercall status. */
static inline int hv_result(u64 status)