Add utility function to issue MMIO TDCALL from TDX guests.
Signed-off-by: Sagi Shahar sagis@google.com --- tools/testing/selftests/kvm/Makefile.kvm | 1 + .../selftests/kvm/include/x86/tdx/tdx.h | 14 ++++++++++++ tools/testing/selftests/kvm/lib/x86/tdx/tdx.c | 22 +++++++++++++++++++ 3 files changed, 37 insertions(+) create mode 100644 tools/testing/selftests/kvm/include/x86/tdx/tdx.h create mode 100644 tools/testing/selftests/kvm/lib/x86/tdx/tdx.c
diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selftests/kvm/Makefile.kvm index 1f541c0d4fe1..8d1aaebd746e 100644 --- a/tools/testing/selftests/kvm/Makefile.kvm +++ b/tools/testing/selftests/kvm/Makefile.kvm @@ -35,6 +35,7 @@ LIBKVM_x86 += lib/x86/vmx.c LIBKVM_x86 += lib/x86/tdx/tdx_util.c LIBKVM_x86 += lib/x86/tdx/td_boot.S LIBKVM_x86 += lib/x86/tdx/tdcall.S +LIBKVM_x86 += lib/x86/tdx/tdx.c
LIBKVM_arm64 += lib/arm64/gic.c LIBKVM_arm64 += lib/arm64/gic_v3.c diff --git a/tools/testing/selftests/kvm/include/x86/tdx/tdx.h b/tools/testing/selftests/kvm/include/x86/tdx/tdx.h new file mode 100644 index 000000000000..22b096402998 --- /dev/null +++ b/tools/testing/selftests/kvm/include/x86/tdx/tdx.h @@ -0,0 +1,14 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef SELFTESTS_TDX_TDX_H +#define SELFTESTS_TDX_TDX_H + +#include <stdint.h> + +/* MMIO direction */ +#define MMIO_READ 0 +#define MMIO_WRITE 1 + +uint64_t tdg_vp_vmcall_ve_request_mmio_write(uint64_t address, uint64_t size, + uint64_t data_in); + +#endif // SELFTESTS_TDX_TDX_H diff --git a/tools/testing/selftests/kvm/lib/x86/tdx/tdx.c b/tools/testing/selftests/kvm/lib/x86/tdx/tdx.c new file mode 100644 index 000000000000..12df30ac1ceb --- /dev/null +++ b/tools/testing/selftests/kvm/lib/x86/tdx/tdx.c @@ -0,0 +1,22 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include "tdx/tdcall.h" +#include "tdx/tdx.h" + +#define TDG_VP_VMCALL 0 + +#define TDG_VP_VMCALL_VE_REQUEST_MMIO 48 + +uint64_t tdg_vp_vmcall_ve_request_mmio_write(uint64_t address, uint64_t size, + uint64_t data_in) +{ + struct tdx_tdcall_args args = { + .r11 = TDG_VP_VMCALL_VE_REQUEST_MMIO, + .r12 = size, + .r13 = MMIO_WRITE, + .r14 = address, + .r15 = data_in, + }; + + return __tdx_tdcall(&args, 0); +}