linux-kernel - [PATCH 12/18] KVM: selftests: Allocate x86's GDT during VM creation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date: Thu, 14 Mar 2024 16:26:31 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Marc Zyngier <maz@...nel.org>, Oliver Upton <oliver.upton@...ux.dev>, 
	Paolo Bonzini <pbonzini@...hat.com>, Christian Borntraeger <borntraeger@...ux.ibm.com>, 
	Janosch Frank <frankja@...ux.ibm.com>, Claudio Imbrenda <imbrenda@...ux.ibm.com>, 
	Sean Christopherson <seanjc@...gle.com>, Anup Patel <anup@...infault.org>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>
Cc: linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev, 
	kvm@...r.kernel.org, kvm-riscv@...ts.infradead.org, 
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	Ackerley Tng <ackerleytng@...gle.com>
Subject: [PATCH 12/18] KVM: selftests: Allocate x86's GDT during VM creation

Allocate the GDT during creation of non-barebones VMs instead of waiting
until the first vCPU is created, as the whole point of non-barebones VMs
is to be able to run vCPUs, i.e. the GDT is going to get allocated no
matter what.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 tools/testing/selftests/kvm/lib/x86_64/processor.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
index f4046029f168..8547833ffa26 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -518,9 +518,6 @@ vm_paddr_t addr_arch_gva2gpa(struct kvm_vm *vm, vm_vaddr_t gva)
 
 static void kvm_setup_gdt(struct kvm_vm *vm, struct kvm_dtable *dt)
 {
-	if (!vm->arch.gdt)
-		vm->arch.gdt = __vm_vaddr_alloc_page(vm, MEM_REGION_DATA);
-
 	dt->base = vm->arch.gdt;
 	dt->limit = getpagesize() - 1;
 }
@@ -644,6 +641,7 @@ static void vm_init_descriptor_tables(struct kvm_vm *vm)
 	extern void *idt_handlers;
 	int i;
 
+	vm->arch.gdt = __vm_vaddr_alloc_page(vm, MEM_REGION_DATA);
 	vm->arch.idt = __vm_vaddr_alloc_page(vm, MEM_REGION_DATA);
 	vm->handlers = __vm_vaddr_alloc_page(vm, MEM_REGION_DATA);
 	/* Handlers have the same address in both address spaces.*/
-- 
2.44.0.291.gc1ea87d7ee-goog