diff options
| author | Dexuan Cui <decui@microsoft.com> | 2023-08-24 01:07:05 -0700 |
|---|---|---|
| committer | Wei Liu <wei.liu@kernel.org> | 2023-08-25 00:04:56 +0000 |
| commit | 68f2f2bc163d4427b04f0fb6421f091f948175fe (patch) | |
| tree | 0c7d17056c380a3445cb7197796d089748daf8c2 /arch/x86/kernel/cpu/mshyperv.c | |
| parent | d6e0228d265f29348a01780ff306321c399d8b95 (diff) | |
Drivers: hv: vmbus: Support fully enlightened TDX guests
Add Hyper-V specific code so that a fully enlightened TDX guest (i.e.
without the paravisor) can run on Hyper-V:
Don't use hv_vp_assist_page. Use GHCI instead.
Don't try to use the unsupported HV_REGISTER_CRASH_CTL.
Don't trust (use) Hyper-V's TLB-flushing hypercalls.
Don't use lazy EOI.
Share the SynIC Event/Message pages with the hypervisor.
Don't use the Hyper-V TSC page for now, because non-trivial work is
required to share the page with the hypervisor.
Reviewed-by: Michael Kelley <mikelley@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/20230824080712.30327-4-decui@microsoft.com
Diffstat (limited to 'arch/x86/kernel/cpu/mshyperv.c')
| -rw-r--r-- | arch/x86/kernel/cpu/mshyperv.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 63093870ec33..ff3d9c5de19c 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -420,6 +420,20 @@ static void __init ms_hyperv_init_platform(void) static_branch_enable(&isolation_type_en_snp); } else if (hv_get_isolation_type() == HV_ISOLATION_TYPE_TDX) { static_branch_enable(&isolation_type_tdx); + + /* A TDX VM must use x2APIC and doesn't use lazy EOI. */ + ms_hyperv.hints &= ~HV_X64_APIC_ACCESS_RECOMMENDED; + + if (!ms_hyperv.paravisor_present) { + /* To be supported: more work is required. */ + ms_hyperv.features &= ~HV_MSR_REFERENCE_TSC_AVAILABLE; + + /* HV_REGISTER_CRASH_CTL is unsupported. */ + ms_hyperv.misc_features &= ~HV_FEATURE_GUEST_CRASH_MSR_AVAILABLE; + + /* Don't trust Hyper-V's TLB-flushing hypercalls. */ + ms_hyperv.hints &= ~HV_X64_REMOTE_TLB_FLUSH_RECOMMENDED; + } } } |