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a=ed25519; pk=cRi0fKzS5BMxlHyHY2pJv3w/1zcgfYKr6EYGYppdMYc= X-Developer-Signature: v=1; a=ed25519-sha256; t=1793922452; l=3068; i=wyihan@google.com; s=20260319; h=from:subject:message-id; bh=blx9Hfl3VSYTcBkvVxCVP+EDfWWPj/zgZHQF+Xi/tns=; b=kQ33hQvPJ0lv05IJFYC0jL5F4lpRe+uOyUMUF5+VLhVu8PNgulou/sSgAx2Q6ZABhXYba4lpO KbQIZDtbGxtCi7skcdldvYrdSGgr6Px/DoNYKFBrFXe6nuzTi5HlbmS X-Mailer: b4 0.14.3 Message-ID: <20261105-tdx-selftests-v16-17-2024e8fa517a@google.com> Subject: [PATCH v16 17/20] KVM: selftests: Add a helper to issue TDVMCALLs from the TDX vm From: Lisa Wang To: Andrew Jones , Ackerley Tng , Binbin Wu , Chao Gao , Chenyi Qiang , Dave Hansen , Erdem Aktas , Ira Weiny , Isaku Yamahata , Kiryl Shutsemau , linux-kselftest@vger.kernel.org, Paolo Bonzini , "Pratik R. Sampat" , Reinette Chatre , Rick Edgecombe , Roger Wang , Ryan Afranji , Sagi Shahar , Sean Christopherson , Shuah Khan , Xiaoyao Li , Oliver Upton Cc: Jeremiah McReynolds , kvm@vger.kernel.org, linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, x86@kernel.org, Lisa Wang Content-Type: text/plain; charset="utf-8" From: Erdem Aktas TDX VMs need to notify the host, e.g. ucall. Add __tdvmcall() to allow VMs to issue TDG.VP.VMCALL with a single function call instead of open-coding TDVMCALL registers setup at every call site. The helper makes standard GHCI TDVMCALLs: the caller passes the GHCI sub-function and up to four arguments and returns the TDVMCALL status from R10. Co-developed-by: Sagi Shahar Signed-off-by: Sagi Shahar Co-developed-by: Lisa Wang Signed-off-by: Lisa Wang Signed-off-by: Erdem Aktas Reviewed-by: Ackerley Tng Reviewed-by: Xiaoyao Li Reviewed-by: Binbin Wu --- tools/testing/selftests/kvm/Makefile.kvm | 1 + tools/testing/selftests/kvm/include/x86/tdx/tdx.h | 9 ++++++ tools/testing/selftests/kvm/lib/x86/tdx/tdx.S | 39 +++++++++++++++++++++++ 3 files changed, 49 insertions(+) diff --git a/tools/testing/selftests/kvm/Makefile.kvm b/tools/testing/selftests/kvm/Makefile.kvm index 5136f49c502b..ab797c8dd497 100644 --- a/tools/testing/selftests/kvm/Makefile.kvm +++ b/tools/testing/selftests/kvm/Makefile.kvm @@ -33,6 +33,7 @@ LIBKVM_x86 += lib/x86/tdx/tdx_util.c LIBKVM_x86 += lib/x86/ucall.c LIBKVM_x86 += lib/x86/vmx.c LIBKVM_x86 += lib/x86/tdx/td_boot.S +LIBKVM_x86 += lib/x86/tdx/tdx.S 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..d41a1efc8a63 --- /dev/null +++ b/tools/testing/selftests/kvm/include/x86/tdx/tdx.h @@ -0,0 +1,9 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef SELFTEST_KVM_TDX_TDX_H +#define SELFTEST_KVM_TDX_TDX_H + +#include + +u64 __tdvmcall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15); + +#endif /* SELFTEST_KVM_TDX_TDX_H */ diff --git a/tools/testing/selftests/kvm/lib/x86/tdx/tdx.S b/tools/testing/selftests/kvm/lib/x86/tdx/tdx.S new file mode 100644 index 000000000000..517727d35e75 --- /dev/null +++ b/tools/testing/selftests/kvm/lib/x86/tdx/tdx.S @@ -0,0 +1,39 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +.globl __tdvmcall +/* + * u64 __tdvmcall(u64 fn, u64 r12, u64 r13, u64 r14, u64 r15) + */ +__tdvmcall: + push %r12 + push %r13 + push %r14 + push %r15 + + /* + * Map C ABI fast arguments to TDX GHCI payload registers + * RDI=fn, RSI=r12, RDX=r13, RCX=r14, R8=r15 + */ + mov %rdi, %r11 + mov %rsi, %r12 + mov %rdx, %r13 + mov %rcx, %r14 + mov %r8, %r15 + + xorl %eax, %eax /* TDCALL leaf 0: TDG.VP.VMCALL */ + mov $0xFC00, %rcx /* Expose R10-R15 */ + xorl %r10d, %r10d /* Standard GHCI call */ + + /* TDCALL instruction */ + .byte 0x66, 0x0f, 0x01, 0xcc + + /* Extract status */ + mov %r10, %rax + + pop %r15 + pop %r14 + pop %r13 + pop %r12 + ret + +.section .note.GNU-stack,"",%progbits -- 2.56.0.455.g6c5a503b38-goog