[PATCH v7 03/30] KVM: selftests: Store initial stack address in struct kvm_vcpu

[Sagi Shahar]

From: Ackerley Tng <ackerley...@google.com>

TDX guests' registers cannot be initialized directly using
vcpu_regs_set(), hence the stack pointer needs to be initialized by
the guest itself, running boot code beginning at the reset vector.

Store the stack address as part of struct kvm_vcpu so that it can
be accessible later to be passed to the boot code for rsp
initialization.

Signed-off-by: Ackerley Tng <ackerley...@google.com>
Signed-off-by: Sagi Shahar <sa...@google.com>
---
 tools/testing/selftests/kvm/include/kvm_util.h  | 1 +
 tools/testing/selftests/kvm/lib/x86/processor.c | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/kvm_util.h 
b/tools/testing/selftests/kvm/include/kvm_util.h
index 9994861d2acb..5c4ca25803ac 100644
--- a/tools/testing/selftests/kvm/include/kvm_util.h
+++ b/tools/testing/selftests/kvm/include/kvm_util.h
@@ -58,6 +58,7 @@ struct kvm_vcpu {
        int fd;
        struct kvm_vm *vm;
        struct kvm_run *run;
+       vm_vaddr_t initial_stack_addr;
 #ifdef __x86_64__
        struct kvm_cpuid2 *cpuid;
 #endif
diff --git a/tools/testing/selftests/kvm/lib/x86/processor.c 
b/tools/testing/selftests/kvm/lib/x86/processor.c
index 002303e2a572..da6e9315ebe2 100644
--- a/tools/testing/selftests/kvm/lib/x86/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86/processor.c
@@ -694,6 +694,8 @@ struct kvm_vcpu *vm_arch_vcpu_add(struct kvm_vm *vm, 
uint32_t vcpu_id)
        vcpu_init_sregs(vm, vcpu);
        vcpu_init_xcrs(vm, vcpu);
 
+       vcpu->initial_stack_addr = stack_vaddr;
+
        /* Setup guest general purpose registers */
        vcpu_regs_get(vcpu, &regs);
        regs.rflags = regs.rflags | 0x2;
-- 
2.50.0.rc2.692.g299adb8693-goog