Re: [RFC PATCH v5 02/29] KVM: selftests: Expose function that sets up sregs based on VM's mode

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On 12/13/2023 4:46 AM, Sagi Shahar wrote:
From: Ackerley Tng <ackerleytng@xxxxxxxxxx>

This allows initializing sregs without setting vCPU registers in
KVM.

No functional change intended.

Reviewed-by: Binbin Wu <binbin.wu@xxxxxxxxxxxxxxx>


Signed-off-by: Ackerley Tng <ackerleytng@xxxxxxxxxx>
Signed-off-by: Ryan Afranji <afranji@xxxxxxxxxx>
Signed-off-by: Sagi Shahar <sagis@xxxxxxxxxx>
---
  .../selftests/kvm/include/x86_64/processor.h  |  2 +
  .../selftests/kvm/lib/x86_64/processor.c      | 39 ++++++++++---------
  2 files changed, 23 insertions(+), 18 deletions(-)

diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h
index 35fcf4d78dfa..0b8855d68744 100644
--- a/tools/testing/selftests/kvm/include/x86_64/processor.h
+++ b/tools/testing/selftests/kvm/include/x86_64/processor.h
@@ -958,6 +958,8 @@ static inline struct kvm_cpuid2 *allocate_kvm_cpuid2(int nr_entries)
  void vcpu_init_cpuid(struct kvm_vcpu *vcpu, const struct kvm_cpuid2 *cpuid);
  void vcpu_set_hv_cpuid(struct kvm_vcpu *vcpu);
+void vcpu_setup_mode_sregs(struct kvm_vm *vm, struct kvm_sregs *sregs);
+
  static inline struct kvm_cpuid_entry2 *__vcpu_get_cpuid_entry(struct kvm_vcpu *vcpu,
  							      uint32_t function,
  							      uint32_t index)
diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
index aef1c021c4bb..f130f78a4974 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -543,36 +543,39 @@ static void kvm_setup_tss_64bit(struct kvm_vm *vm, struct kvm_segment *segp,
  	kvm_seg_fill_gdt_64bit(vm, segp);
  }
-static void vcpu_setup(struct kvm_vm *vm, struct kvm_vcpu *vcpu)
+void vcpu_setup_mode_sregs(struct kvm_vm *vm, struct kvm_sregs *sregs)
  {
-	struct kvm_sregs sregs;
-
-	/* Set mode specific system register values. */
-	vcpu_sregs_get(vcpu, &sregs);
-
-	sregs.idt.limit = 0;
+	sregs->idt.limit = 0;
- kvm_setup_gdt(vm, &sregs.gdt);
+	kvm_setup_gdt(vm, &sregs->gdt);
switch (vm->mode) {
  	case VM_MODE_PXXV48_4K_SEV:
  	case VM_MODE_PXXV48_4K:
-		sregs.cr0 = X86_CR0_PE | X86_CR0_NE | X86_CR0_PG;
-		sregs.cr4 |= X86_CR4_PAE | X86_CR4_OSFXSR;
-		sregs.efer |= (EFER_LME | EFER_LMA | EFER_NX);
-
-		kvm_seg_set_unusable(&sregs.ldt);
-		kvm_seg_set_kernel_code_64bit(vm, DEFAULT_CODE_SELECTOR, &sregs.cs);
-		kvm_seg_set_kernel_data_64bit(vm, DEFAULT_DATA_SELECTOR, &sregs.ds);
-		kvm_seg_set_kernel_data_64bit(vm, DEFAULT_DATA_SELECTOR, &sregs.es);
-		kvm_setup_tss_64bit(vm, &sregs.tr, 0x18);
+		sregs->cr0 = X86_CR0_PE | X86_CR0_NE | X86_CR0_PG;
+		sregs->cr4 |= X86_CR4_PAE | X86_CR4_OSFXSR;
+		sregs->efer |= (EFER_LME | EFER_LMA | EFER_NX);
+
+		kvm_seg_set_unusable(&sregs->ldt);
+		kvm_seg_set_kernel_code_64bit(vm, DEFAULT_CODE_SELECTOR, &sregs->cs);
+		kvm_seg_set_kernel_data_64bit(vm, DEFAULT_DATA_SELECTOR, &sregs->ds);
+		kvm_seg_set_kernel_data_64bit(vm, DEFAULT_DATA_SELECTOR, &sregs->es);
+		kvm_setup_tss_64bit(vm, &sregs->tr, 0x18);
  		break;
default:
  		TEST_FAIL("Unknown guest mode, mode: 0x%x", vm->mode);
  	}
- sregs.cr3 = vm->pgd;
+	sregs->cr3 = vm->pgd;
+}
+
+static void vcpu_setup(struct kvm_vm *vm, struct kvm_vcpu *vcpu)
+{
+	struct kvm_sregs sregs;
+
+	vcpu_sregs_get(vcpu, &sregs);
+	vcpu_setup_mode_sregs(vm, &sregs);
  	vcpu_sregs_set(vcpu, &sregs);
  }





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