diff options
| author | Tianyu Lan <Tianyu.Lan@microsoft.com> | 2021-10-25 08:21:07 -0400 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2021-10-28 10:47:52 +0000 |
| commit | af788f355e343373490b7d2e361016e7c24a0ffa (patch) | |
| tree | d3f24c0227d4f309c4428a24791700f9c3f8a725 | |
| parent | 0cc4f6d9f0b9f20f3f1e1149bdb6737c0b4e134a (diff) | |
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>
| -rw-r--r-- | arch/x86/kernel/cpu/mshyperv.c | 2 | ||||
| -rw-r--r-- | include/asm-generic/mshyperv.h | 12 |
2 files changed, 13 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index b09ade389040..4794b716ec79 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -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); diff --git a/include/asm-generic/mshyperv.h b/include/asm-generic/mshyperv.h index 2d88aa855f7e..a8ac497167d2 100644 --- a/include/asm-generic/mshyperv.h +++ b/include/asm-generic/mshyperv.h @@ -35,7 +35,17 @@ struct ms_hyperv_info { u32 max_vp_index; u32 max_lp_index; u32 isolation_config_a; - u32 isolation_config_b; + 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; |