diff options
| author | Dexuan Cui <decui@microsoft.com> | 2023-08-24 11:07:04 +0300 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2023-08-25 03:04:56 +0300 |
| commit | d6e0228d265f29348a01780ff306321c399d8b95 (patch) | |
| tree | 5c05fed6d87e9444003f911e73389ce926def88c /arch/x86/hyperv | |
| parent | 08e9d12077fcc7c4c4579d7dcd8093b59b01369e (diff) | |
| download | linux-d6e0228d265f29348a01780ff306321c399d8b95.tar.xz | |
x86/hyperv: Support hypercalls for fully enlightened TDX guests
A fully enlightened TDX guest on Hyper-V (i.e. without the paravisor) only
uses the GHCI call rather than hv_hypercall_pg. Do not initialize
hypercall_pg for such a guest.
In hv_common_cpu_init(), the hyperv_pcpu_input_arg page needs to be
decrypted in such a guest.
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
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/20230824080712.30327-3-decui@microsoft.com
Diffstat (limited to 'arch/x86/hyperv')
| -rw-r--r-- | arch/x86/hyperv/hv_init.c | 8 | ||||
| -rw-r--r-- | arch/x86/hyperv/ivm.c | 17 |
2 files changed, 25 insertions, 0 deletions
diff --git a/arch/x86/hyperv/hv_init.c b/arch/x86/hyperv/hv_init.c index bcfbcda8b050..255e02ec467e 100644 --- a/arch/x86/hyperv/hv_init.c +++ b/arch/x86/hyperv/hv_init.c @@ -476,6 +476,10 @@ void __init hyperv_init(void) /* Hyper-V requires to write guest os id via ghcb in SNP IVM. */ hv_ghcb_msr_write(HV_X64_MSR_GUEST_OS_ID, guest_id); + /* A TDX guest uses the GHCI call rather than hv_hypercall_pg. */ + if (hv_isolation_type_tdx()) + goto skip_hypercall_pg_init; + hv_hypercall_pg = __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, VMALLOC_END, GFP_KERNEL, PAGE_KERNEL_ROX, VM_FLUSH_RESET_PERMS, NUMA_NO_NODE, @@ -515,6 +519,7 @@ void __init hyperv_init(void) wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64); } +skip_hypercall_pg_init: /* * hyperv_init() is called before LAPIC is initialized: see * apic_intr_mode_init() -> x86_platform.apic_post_init() and @@ -642,6 +647,9 @@ bool hv_is_hyperv_initialized(void) if (x86_hyper_type != X86_HYPER_MS_HYPERV) return false; + /* A TDX guest uses the GHCI call rather than hv_hypercall_pg. */ + if (hv_isolation_type_tdx()) + return true; /* * Verify that earlier initialization succeeded by checking * that the hypercall page is setup diff --git a/arch/x86/hyperv/ivm.c b/arch/x86/hyperv/ivm.c index afdae1a8a117..6c7598d9e68a 100644 --- a/arch/x86/hyperv/ivm.c +++ b/arch/x86/hyperv/ivm.c @@ -571,3 +571,20 @@ bool hv_isolation_type_tdx(void) { return static_branch_unlikely(&isolation_type_tdx); } + +#ifdef CONFIG_INTEL_TDX_GUEST + +u64 hv_tdx_hypercall(u64 control, u64 param1, u64 param2) +{ + struct tdx_hypercall_args args = { }; + + args.r10 = control; + args.rdx = param1; + args.r8 = param2; + + (void)__tdx_hypercall_ret(&args); + + return args.r11; +} + +#endif |