diff options
| author | Isaku Yamahata <isaku.yamahata@intel.com> | 2025-02-22 09:42:21 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2025-03-14 14:20:55 -0400 |
| commit | d5998c02bcc22a5a0b3c34f89f2458f6aecceb4a (patch) | |
| tree | abeb8ddc40f4651f4d9b29179a557c83491a1b84 | |
| parent | c42856af8f70d983c007724afb0a684cfae34382 (diff) | |
KVM: TDX: Handle KVM hypercall with TDG.VP.VMCALL
Handle KVM hypercall for TDX according to TDX Guest-Host Communication
Interface (GHCI) specification.
The TDX GHCI specification defines the ABI for the guest TD to issue
hypercalls. When R10 is non-zero, it indicates the TDG.VP.VMCALL is
vendor-specific. KVM uses R10 as KVM hypercall number and R11-R14
as 4 arguments, while the error code is returned in R10.
Morph the TDG.VP.VMCALL with KVM hypercall to EXIT_REASON_VMCALL and
marshall r10~r14 from vp_enter_args to the appropriate x86 registers for
KVM hypercall handling.
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Co-developed-by: Binbin Wu <binbin.wu@linux.intel.com>
Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com>
Message-ID: <20250222014225.897298-6-binbin.wu@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/vmx/tdx.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c index 78a2796eb0ff..ed3a6e2d6a11 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -978,6 +978,23 @@ fastpath_t tdx_vcpu_run(struct kvm_vcpu *vcpu, bool force_immediate_exit) return tdx_exit_handlers_fastpath(vcpu); } +static int complete_hypercall_exit(struct kvm_vcpu *vcpu) +{ + tdvmcall_set_return_code(vcpu, vcpu->run->hypercall.ret); + return 1; +} + +static int tdx_emulate_vmcall(struct kvm_vcpu *vcpu) +{ + kvm_rax_write(vcpu, to_tdx(vcpu)->vp_enter_args.r10); + kvm_rbx_write(vcpu, to_tdx(vcpu)->vp_enter_args.r11); + kvm_rcx_write(vcpu, to_tdx(vcpu)->vp_enter_args.r12); + kvm_rdx_write(vcpu, to_tdx(vcpu)->vp_enter_args.r13); + kvm_rsi_write(vcpu, to_tdx(vcpu)->vp_enter_args.r14); + + return __kvm_emulate_hypercall(vcpu, 0, complete_hypercall_exit); +} + static int handle_tdvmcall(struct kvm_vcpu *vcpu) { switch (tdvmcall_leaf(vcpu)) { @@ -1349,6 +1366,8 @@ int tdx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t fastpath) return 0; case EXIT_REASON_TDCALL: return handle_tdvmcall(vcpu); + case EXIT_REASON_VMCALL: + return tdx_emulate_vmcall(vcpu); default: break; } |