linux-kernel - [PATCH v6 04/30] KVM: selftests: Add vCPU descriptor table initialization utility

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Message-ID: <20250414214801.2693294-5-sagis@google.com>
Date: Mon, 14 Apr 2025 14:47:33 -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>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: [PATCH v6 04/30] KVM: selftests: Add vCPU descriptor table
 initialization utility

From: Ackerley Tng <ackerleytng@...gle.com>

Turn vCPU descriptor table initialization into a utility for use by tests
needing finer control, for example for TDX TD creation.

Signed-off-by: Ackerley Tng <ackerleytng@...gle.com>
Signed-off-by: Sagi Shahar <sagis@...gle.com>
---
 tools/testing/selftests/kvm/include/x86/processor.h | 1 +
 tools/testing/selftests/kvm/lib/x86/processor.c     | 7 ++++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/kvm/include/x86/processor.h b/tools/testing/selftests/kvm/include/x86/processor.h
index 3162c6e8ea23..7c4e545ae9c9 100644
--- a/tools/testing/selftests/kvm/include/x86/processor.h
+++ b/tools/testing/selftests/kvm/include/x86/processor.h
@@ -1178,6 +1178,7 @@ struct idt_entry {
 	uint32_t offset2; uint32_t reserved;
 };
 
+void sync_exception_handlers_to_guest(struct kvm_vm *vm);
 void vm_install_exception_handler(struct kvm_vm *vm, int vector,
 			void (*handler)(struct ex_regs *));
 
diff --git a/tools/testing/selftests/kvm/lib/x86/processor.c b/tools/testing/selftests/kvm/lib/x86/processor.c
index 7c0fe3b138a1..80b7c4482485 100644
--- a/tools/testing/selftests/kvm/lib/x86/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86/processor.c
@@ -585,6 +585,11 @@ void route_exception(struct ex_regs *regs)
 		   regs->vector, regs->rip);
 }
 
+void sync_exception_handlers_to_guest(struct kvm_vm *vm)
+{
+	*(vm_vaddr_t *)addr_gva2hva(vm, (vm_vaddr_t)(&exception_handlers)) = vm->handlers;
+}
+
 static void vm_init_descriptor_tables(struct kvm_vm *vm)
 {
 	extern void *idt_handlers;
@@ -600,7 +605,7 @@ static void vm_init_descriptor_tables(struct kvm_vm *vm)
 	for (i = 0; i < NUM_INTERRUPTS; i++)
 		set_idt_entry(vm, i, (unsigned long)(&idt_handlers)[i], 0, KERNEL_CS);
 
-	*(vm_vaddr_t *)addr_gva2hva(vm, (vm_vaddr_t)(&exception_handlers)) = vm->handlers;
+	sync_exception_handlers_to_guest(vm);
 
 	kvm_seg_set_kernel_code_64bit(&seg);
 	kvm_seg_fill_gdt_64bit(vm, &seg);
-- 
2.49.0.504.g3bcea36a83-goog