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Message-ID: <20250904065453.639610-18-sagis@google.com>
Date: Wed, 3 Sep 2025 23:54:47 -0700
From: Sagi Shahar <sagis@...gle.com>
To: linux-kselftest@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
Shuah Khan <shuah@...nel.org>, Sean Christopherson <seanjc@...gle.com>,
Ackerley Tng <ackerleytng@...gle.com>, Ryan Afranji <afranji@...gle.com>,
Andrew Jones <ajones@...tanamicro.com>, Isaku Yamahata <isaku.yamahata@...el.com>,
Erdem Aktas <erdemaktas@...gle.com>, Rick Edgecombe <rick.p.edgecombe@...el.com>,
Sagi Shahar <sagis@...gle.com>, Roger Wang <runanwang@...gle.com>,
Binbin Wu <binbin.wu@...ux.intel.com>, Oliver Upton <oliver.upton@...ux.dev>,
"Pratik R. Sampat" <pratikrajesh.sampat@....com>, Reinette Chatre <reinette.chatre@...el.com>,
Ira Weiny <ira.weiny@...el.com>, Chao Gao <chao.gao@...el.com>,
Chenyi Qiang <chenyi.qiang@...el.com>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: [PATCH v10 17/21] KVM: selftests: Set entry point for TDX guest code
Since the rip register is inaccessible for TDX VMs, we need a different
way to set the guest entry point for TDX VMs. This is done by writing
the guest code address to a predefined location in the guest memory and
loading it into rip as part of the TDX boot code.
Signed-off-by: Sagi Shahar <sagis@...gle.com>
---
tools/testing/selftests/kvm/lib/x86/processor.c | 10 +++++++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/tools/testing/selftests/kvm/lib/x86/processor.c b/tools/testing/selftests/kvm/lib/x86/processor.c
index b1e5f4137629..4a831b0f206e 100644
--- a/tools/testing/selftests/kvm/lib/x86/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86/processor.c
@@ -654,9 +654,13 @@ void vcpu_arch_set_entry_point(struct kvm_vcpu *vcpu, void *guest_code)
{
struct kvm_regs regs;
- vcpu_regs_get(vcpu, ®s);
- regs.rip = (unsigned long) guest_code;
- vcpu_regs_set(vcpu, ®s);
+ if (is_tdx_vm(vcpu->vm))
+ vm_tdx_set_vcpu_entry_point(vcpu, guest_code);
+ else {
+ vcpu_regs_get(vcpu, ®s);
+ regs.rip = (unsigned long) guest_code;
+ vcpu_regs_set(vcpu, ®s);
+ }
}
vm_vaddr_t kvm_allocate_vcpu_stack(struct kvm_vm *vm)
--
2.51.0.338.gd7d06c2dae-goog
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