| Message ID | 4f4aaf292008608a8717e9553c3315ee02f66b20.1708933498.git.isaku.yamahata@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v19,001/130] x86/virt/tdx: Rename _offset to _member for TD_SYSINFO_MAP() macro | expand |
On 2/26/2024 4:26 PM, isaku.yamahata@intel.com wrote: > From: Isaku Yamahata <isaku.yamahata@intel.com> > > Wire up TDX PV port IO hypercall to the KVM backend function. > > Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com> > Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> > --- > v18: > - Fix out case to set R10 and R11 correctly when user space handled port > out. > --- > arch/x86/kvm/vmx/tdx.c | 67 ++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 67 insertions(+) > > diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c > index a2caf2ae838c..55fc6cc6c816 100644 > --- a/arch/x86/kvm/vmx/tdx.c > +++ b/arch/x86/kvm/vmx/tdx.c > @@ -1152,6 +1152,71 @@ static int tdx_emulate_hlt(struct kvm_vcpu *vcpu) > return kvm_emulate_halt_noskip(vcpu); > } > > +static int tdx_complete_pio_out(struct kvm_vcpu *vcpu) > +{ > + tdvmcall_set_return_code(vcpu, TDVMCALL_SUCCESS); > + tdvmcall_set_return_val(vcpu, 0); > + return 1; > +} > + > +static int tdx_complete_pio_in(struct kvm_vcpu *vcpu) > +{ > + struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt; > + unsigned long val = 0; > + int ret; > + > + WARN_ON_ONCE(vcpu->arch.pio.count != 1); > + > + ret = ctxt->ops->pio_in_emulated(ctxt, vcpu->arch.pio.size, > + vcpu->arch.pio.port, &val, 1); > + WARN_ON_ONCE(!ret); > + > + tdvmcall_set_return_code(vcpu, TDVMCALL_SUCCESS); > + tdvmcall_set_return_val(vcpu, val); > + > + return 1; > +} > + > +static int tdx_emulate_io(struct kvm_vcpu *vcpu) > +{ > + struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt; > + unsigned long val = 0; > + unsigned int port; > + int size, ret; > + bool write; > + > + ++vcpu->stat.io_exits; > + > + size = tdvmcall_a0_read(vcpu); > + write = tdvmcall_a1_read(vcpu); > + port = tdvmcall_a2_read(vcpu); > + > + if (size != 1 && size != 2 && size != 4) { > + tdvmcall_set_return_code(vcpu, TDVMCALL_INVALID_OPERAND); > + return 1; > + } > + > + if (write) { > + val = tdvmcall_a3_read(vcpu); > + ret = ctxt->ops->pio_out_emulated(ctxt, size, port, &val, 1); > + > + /* No need for a complete_userspace_io callback. */ I am confused about the comment. The code below sets the complete_userspace_io callback for write case, i.e. tdx_complete_pio_out(). > + vcpu->arch.pio.count = 0; > + } else > + ret = ctxt->ops->pio_in_emulated(ctxt, size, port, &val, 1); > + > + if (ret) > + tdvmcall_set_return_val(vcpu, val); > + else { > + if (write) > + vcpu->arch.complete_userspace_io = tdx_complete_pio_out; > + else > + vcpu->arch.complete_userspace_io = tdx_complete_pio_in; > + } > + > + return ret; > +} > + > static int handle_tdvmcall(struct kvm_vcpu *vcpu) > { > if (tdvmcall_exit_type(vcpu)) > @@ -1162,6 +1227,8 @@ static int handle_tdvmcall(struct kvm_vcpu *vcpu) > return tdx_emulate_cpuid(vcpu); > case EXIT_REASON_HLT: > return tdx_emulate_hlt(vcpu); > + case EXIT_REASON_IO_INSTRUCTION: > + return tdx_emulate_io(vcpu); > default: > break; > }
On Wed, Apr 17, 2024 at 08:51:39PM +0800, Binbin Wu <binbin.wu@linux.intel.com> wrote: > > > On 2/26/2024 4:26 PM, isaku.yamahata@intel.com wrote: > > From: Isaku Yamahata <isaku.yamahata@intel.com> > > > > Wire up TDX PV port IO hypercall to the KVM backend function. > > > > Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com> > > Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> > > --- > > v18: > > - Fix out case to set R10 and R11 correctly when user space handled port > > out. > > --- > > arch/x86/kvm/vmx/tdx.c | 67 ++++++++++++++++++++++++++++++++++++++++++ > > 1 file changed, 67 insertions(+) > > > > diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c > > index a2caf2ae838c..55fc6cc6c816 100644 > > --- a/arch/x86/kvm/vmx/tdx.c > > +++ b/arch/x86/kvm/vmx/tdx.c > > @@ -1152,6 +1152,71 @@ static int tdx_emulate_hlt(struct kvm_vcpu *vcpu) > > return kvm_emulate_halt_noskip(vcpu); > > } > > +static int tdx_complete_pio_out(struct kvm_vcpu *vcpu) > > +{ > > + tdvmcall_set_return_code(vcpu, TDVMCALL_SUCCESS); > > + tdvmcall_set_return_val(vcpu, 0); > > + return 1; > > +} > > + > > +static int tdx_complete_pio_in(struct kvm_vcpu *vcpu) > > +{ > > + struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt; > > + unsigned long val = 0; > > + int ret; > > + > > + WARN_ON_ONCE(vcpu->arch.pio.count != 1); > > + > > + ret = ctxt->ops->pio_in_emulated(ctxt, vcpu->arch.pio.size, > > + vcpu->arch.pio.port, &val, 1); > > + WARN_ON_ONCE(!ret); > > + > > + tdvmcall_set_return_code(vcpu, TDVMCALL_SUCCESS); > > + tdvmcall_set_return_val(vcpu, val); > > + > > + return 1; > > +} > > + > > +static int tdx_emulate_io(struct kvm_vcpu *vcpu) > > +{ > > + struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt; > > + unsigned long val = 0; > > + unsigned int port; > > + int size, ret; > > + bool write; > > + > > + ++vcpu->stat.io_exits; > > + > > + size = tdvmcall_a0_read(vcpu); > > + write = tdvmcall_a1_read(vcpu); > > + port = tdvmcall_a2_read(vcpu); > > + > > + if (size != 1 && size != 2 && size != 4) { > > + tdvmcall_set_return_code(vcpu, TDVMCALL_INVALID_OPERAND); > > + return 1; > > + } > > + > > + if (write) { > > + val = tdvmcall_a3_read(vcpu); > > + ret = ctxt->ops->pio_out_emulated(ctxt, size, port, &val, 1); > > + > > + /* No need for a complete_userspace_io callback. */ > I am confused about the comment. > > The code below sets the complete_userspace_io callback for write case, > i.e. tdx_complete_pio_out(). You're correct. This comment is stale and should be removed it.
diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c index a2caf2ae838c..55fc6cc6c816 100644 --- a/arch/x86/kvm/vmx/tdx.c +++ b/arch/x86/kvm/vmx/tdx.c @@ -1152,6 +1152,71 @@ static int tdx_emulate_hlt(struct kvm_vcpu *vcpu) return kvm_emulate_halt_noskip(vcpu); } +static int tdx_complete_pio_out(struct kvm_vcpu *vcpu) +{ + tdvmcall_set_return_code(vcpu, TDVMCALL_SUCCESS); + tdvmcall_set_return_val(vcpu, 0); + return 1; +} + +static int tdx_complete_pio_in(struct kvm_vcpu *vcpu) +{ + struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt; + unsigned long val = 0; + int ret; + + WARN_ON_ONCE(vcpu->arch.pio.count != 1); + + ret = ctxt->ops->pio_in_emulated(ctxt, vcpu->arch.pio.size, + vcpu->arch.pio.port, &val, 1); + WARN_ON_ONCE(!ret); + + tdvmcall_set_return_code(vcpu, TDVMCALL_SUCCESS); + tdvmcall_set_return_val(vcpu, val); + + return 1; +} + +static int tdx_emulate_io(struct kvm_vcpu *vcpu) +{ + struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt; + unsigned long val = 0; + unsigned int port; + int size, ret; + bool write; + + ++vcpu->stat.io_exits; + + size = tdvmcall_a0_read(vcpu); + write = tdvmcall_a1_read(vcpu); + port = tdvmcall_a2_read(vcpu); + + if (size != 1 && size != 2 && size != 4) { + tdvmcall_set_return_code(vcpu, TDVMCALL_INVALID_OPERAND); + return 1; + } + + if (write) { + val = tdvmcall_a3_read(vcpu); + ret = ctxt->ops->pio_out_emulated(ctxt, size, port, &val, 1); + + /* No need for a complete_userspace_io callback. */ + vcpu->arch.pio.count = 0; + } else + ret = ctxt->ops->pio_in_emulated(ctxt, size, port, &val, 1); + + if (ret) + tdvmcall_set_return_val(vcpu, val); + else { + if (write) + vcpu->arch.complete_userspace_io = tdx_complete_pio_out; + else + vcpu->arch.complete_userspace_io = tdx_complete_pio_in; + } + + return ret; +} + static int handle_tdvmcall(struct kvm_vcpu *vcpu) { if (tdvmcall_exit_type(vcpu)) @@ -1162,6 +1227,8 @@ static int handle_tdvmcall(struct kvm_vcpu *vcpu) return tdx_emulate_cpuid(vcpu); case EXIT_REASON_HLT: return tdx_emulate_hlt(vcpu); + case EXIT_REASON_IO_INSTRUCTION: + return tdx_emulate_io(vcpu); default: break; }