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KVM: TDX: Handle KVM hypercall with TDG.VP.VMCALL

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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>
This commit is contained in:
Isaku Yamahata 2025-02-22 09:42:21 +08:00 committed by Paolo Bonzini
parent c42856af8f
commit d5998c02bc
1 changed files with 19 additions and 0 deletions
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19
arch/x86/kvm/vmx/tdx.c
View File

@ -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;
}