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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: Sagi Shahar Introduce kvm_allocate_vcpu_stack() to allocate a vCPU's stack in preparation for TDX to allocate a vCPU's stack and initialize its stack pointer. TDX VMs' registers are protected state and cannot be initialized using the KVM_SET_REGS ioctl() that is used for normal VMs. A TDX vCPU's stack address will be a property of the TDX specific boot code that initializes the vCPUs' stack pointers at boot. Reviewed-by: Binbin Wu Signed-off-by: Sagi Shahar Reviewed-by: Ira Weiny Signed-off-by: Lisa Wang --- tools/testing/selftests/kvm/include/x86/processor.h | 2 ++ tools/testing/selftests/kvm/lib/x86/processor.c | 16 +++++++++++----- 2 files changed, 13 insertions(+), 5 deletions(-) diff --git a/tools/testing/selftests/kvm/include/x86/processor.h b/tools/testing/selftests/kvm/include/x86/processor.h index 7e00c9414595..ff3219edab44 100644 --- a/tools/testing/selftests/kvm/include/x86/processor.h +++ b/tools/testing/selftests/kvm/include/x86/processor.h @@ -1144,6 +1144,8 @@ static inline void vcpu_clear_cpuid_feature(struct kvm_vcpu *vcpu, vcpu_set_or_clear_cpuid_feature(vcpu, feature, false); } +gva_t kvm_allocate_vcpu_stack(struct kvm_vm *vm); + u64 vcpu_get_msr(struct kvm_vcpu *vcpu, u64 msr_index); int _vcpu_set_msr(struct kvm_vcpu *vcpu, u64 msr_index, u64 msr_value); diff --git a/tools/testing/selftests/kvm/lib/x86/processor.c b/tools/testing/selftests/kvm/lib/x86/processor.c index 748c6041f8bf..8f8bb90fec35 100644 --- a/tools/testing/selftests/kvm/lib/x86/processor.c +++ b/tools/testing/selftests/kvm/lib/x86/processor.c @@ -813,12 +813,9 @@ void vcpu_arch_set_entry_point(struct kvm_vcpu *vcpu, void *guest_code) vcpu_regs_set(vcpu, ®s); } -struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, u32 vcpu_id) +gva_t kvm_allocate_vcpu_stack(struct kvm_vm *vm) { - struct kvm_mp_state mp_state; - struct kvm_regs regs; gva_t stack_gva; - struct kvm_vcpu *vcpu; stack_gva = __vm_alloc(vm, DEFAULT_STACK_PGS * getpagesize(), DEFAULT_GUEST_STACK_VADDR_MIN, MEM_REGION_DATA); @@ -838,6 +835,15 @@ struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, u32 vcpu_id) "__vm_alloc() did not provide a page-aligned address"); stack_gva -= 8; + return stack_gva; +} + +struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, u32 vcpu_id) +{ + struct kvm_mp_state mp_state; + struct kvm_vcpu *vcpu; + struct kvm_regs regs; + vcpu = __vm_vcpu_add(vm, vcpu_id); vcpu_init_cpuid(vcpu, kvm_get_supported_cpuid()); vcpu_init_sregs(vm, vcpu); @@ -846,7 +852,7 @@ struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, u32 vcpu_id) /* Setup guest general purpose registers */ vcpu_regs_get(vcpu, ®s); regs.rflags = regs.rflags | 0x2; - regs.rsp = stack_gva; + regs.rsp = kvm_allocate_vcpu_stack(vm); vcpu_regs_set(vcpu, ®s); /* Setup the MP state */ -- 2.55.0.229.g6434b31f56-goog