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x86/hyperv: Initialize shared memory boundary in the Isolation VM. 

Hyper-V exposes shared memory boundary via cpuid
HYPERV_CPUID_ISOLATION_CONFIG and store it in the
shared_gpa_boundary of ms_hyperv struct. This prepares
to share memory with host for SNP guest.

Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
Link: https://lore.kernel.org/r/20211025122116.264793-3-ltykernel@gmail.com
Signed-off-by: Wei Liu <wei.liu@kernel.org>
This commit is contained in:
Tianyu Lan 2021-10-25 08:21:07 -04:00 committed by Wei Liu
parent 0cc4f6d9f0
commit af788f355e
2 changed files with 13 additions and 1 deletions
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2
arch/x86/kernel/cpu/mshyperv.c
View File

@ -313,6 +313,8 @@ static void __init ms_hyperv_init_platform(void)
if (ms_hyperv.priv_high & HV_ISOLATION) {
ms_hyperv.isolation_config_a = cpuid_eax(HYPERV_CPUID_ISOLATION_CONFIG);
ms_hyperv.isolation_config_b = cpuid_ebx(HYPERV_CPUID_ISOLATION_CONFIG);
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);

10
include/asm-generic/mshyperv.h
View File

@ -35,7 +35,17 @@ struct ms_hyperv_info {
u32 max_vp_index;
u32 max_lp_index;
u32 isolation_config_a;
union {
u32 isolation_config_b;
struct {
u32 cvm_type : 4;
u32 reserved1 : 1;
u32 shared_gpa_boundary_active : 1;
u32 shared_gpa_boundary_bits : 6;
u32 reserved2 : 20;
};
};
u64 shared_gpa_boundary;
};
extern struct ms_hyperv_info ms_hyperv;