KVM: arm64: Sidestep stage2_unmap_vm() on vcpu reset when S2FWB is supported

stage2_unmap_vm() was introduced to unmap user RAM region in the stage2
page table to make the caches coherent. E.g., a guest reboot with stage1
MMU disabled will access memory using non-cacheable attributes. If the
RAM and caches are not coherent at this stage, some evicted dirty cache
line may go and corrupt guest data in RAM.

Since ARMv8.4, S2FWB feature is mandatory and KVM will take advantage
of it to configure the stage2 page table and the attributes of memory
access. So we ensure that guests always access memory using cacheable
attributes and thus, the caches always be coherent.

So on CPUs that support S2FWB, we can safely reset the vcpu without a
heavy stage2 unmapping.
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200415072835.1164-1-yuzenghui@huawei.com

arch/arm64/kvm/arm.c

@@ -983,8 +983,11 @@ static int kvm_arch_vcpu_ioctl_vcpu_init(struct kvm_vcpu *vcpu,
 	/*
 	 * Ensure a rebooted VM will fault in RAM pages and detect if the
 	 * guest MMU is turned off and flush the caches as needed.
+	 *
+	 * S2FWB enforces all memory accesses to RAM being cacheable, we
+	 * ensure that the cache is always coherent.
 	 */
-	if (vcpu->arch.has_run_once)
+	if (vcpu->arch.has_run_once && !cpus_have_const_cap(ARM64_HAS_STAGE2_FWB))
 		stage2_unmap_vm(vcpu->kvm);
 
 	vcpu_reset_hcr(vcpu);