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x86/hyperv: Add hv_isolation_type_tdx() to detect TDX guests

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No logic change to SNP/VBS guests.

hv_isolation_type_tdx() will be used to instruct a TDX guest on Hyper-V to
do some TDX-specific operations, e.g. for a fully enlightened TDX guest
(i.e. without the paravisor), hv_do_hypercall() should use
__tdx_hypercall() and such a guest on Hyper-V should handle the Hyper-V
Event/Message/Monitor pages specially.

Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Tianyu Lan <tiala@microsoft.com>
Signed-off-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Link: https://lore.kernel.org/r/20230824080712.30327-2-decui@microsoft.com
This commit is contained in:
Dexuan Cui 2023-08-24 01:07:03 -07:00 committed by Wei Liu
parent 86e619c922
commit 08e9d12077
6 changed files with 23 additions and 1 deletions
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9
arch/x86/hyperv/ivm.c
View File

@ -562,3 +562,12 @@ bool hv_isolation_type_en_snp(void)
return static_branch_unlikely(&isolation_type_en_snp);
}
DEFINE_STATIC_KEY_FALSE(isolation_type_tdx);
/*
* hv_isolation_type_tdx - Check if the system runs in an Intel TDX based
* isolated VM.
*/
bool hv_isolation_type_tdx(void)
{
return static_branch_unlikely(&isolation_type_tdx);
}

3
arch/x86/include/asm/hyperv-tlfs.h
View File

@ -169,7 +169,8 @@
enum hv_isolation_type {
HV_ISOLATION_TYPE_NONE = 0,
HV_ISOLATION_TYPE_VBS = 1,
HV_ISOLATION_TYPE_SNP = 2
HV_ISOLATION_TYPE_SNP = 2,
HV_ISOLATION_TYPE_TDX = 3
};
/* Hyper-V specific model specific registers (MSRs) */

3
arch/x86/include/asm/mshyperv.h
View File

@ -27,6 +27,7 @@ union hv_ghcb;
DECLARE_STATIC_KEY_FALSE(isolation_type_snp);
DECLARE_STATIC_KEY_FALSE(isolation_type_en_snp);
DECLARE_STATIC_KEY_FALSE(isolation_type_tdx);
typedef int (*hyperv_fill_flush_list_func)(
struct hv_guest_mapping_flush_list *flush,
@ -49,6 +50,8 @@ extern u64 hv_current_partition_id;
extern union hv_ghcb * __percpu *hv_ghcb_pg;
extern bool hv_isolation_type_en_snp(void);
bool hv_isolation_type_tdx(void);
/*
* DEFAULT INIT GPAT and SEGMENT LIMIT value in struct VMSA
* to start AP in enlightened SEV guest.

2
arch/x86/kernel/cpu/mshyperv.c
View File

@ -418,6 +418,8 @@ static void __init ms_hyperv_init_platform(void)
static_branch_enable(&isolation_type_snp);
else
static_branch_enable(&isolation_type_en_snp);
} else if (hv_get_isolation_type() == HV_ISOLATION_TYPE_TDX) {
static_branch_enable(&isolation_type_tdx);
}
}

6
drivers/hv/hv_common.c
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@ -521,6 +521,12 @@ bool __weak hv_isolation_type_en_snp(void)
}
EXPORT_SYMBOL_GPL(hv_isolation_type_en_snp);
bool __weak hv_isolation_type_tdx(void)
{
return false;
}
EXPORT_SYMBOL_GPL(hv_isolation_type_tdx);
void __weak hv_setup_vmbus_handler(void (*handler)(void))
{
}

1
include/asm-generic/mshyperv.h
View File

@ -66,6 +66,7 @@ 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);
bool hv_isolation_type_tdx(void);
/* Helper functions that provide a consistent pattern for checking Hyper-V hypercall status. */
static inline int hv_result(u64 status)