[PATCH v2 06/16] KVM: arm64: Force a full unmap on vpcu reinit
From: Marc Zyngier <maz@kernel.org>
Date: 2021-10-04 17:49:35
Also in:
kvm, kvmarm, lkml
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
As we now keep information in the S2PT, we must be careful not to keep it across a VM reboot, which could otherwise lead to interesting problems. Make sure that the S2 is completely discarded on reset of a vcpu, and remove the flag that enforces the MMIO check. Signed-off-by: Marc Zyngier <maz@kernel.org> --- arch/arm64/kvm/psci.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/arch/arm64/kvm/psci.c b/arch/arm64/kvm/psci.c
index 74c47d420253..6c9cb041f764 100644
--- a/arch/arm64/kvm/psci.c
+++ b/arch/arm64/kvm/psci.c@@ -12,6 +12,7 @@ #include <asm/cputype.h> #include <asm/kvm_emulate.h> +#include <asm/kvm_mmu.h> #include <kvm/arm_psci.h> #include <kvm/arm_hypercalls.h>
@@ -180,6 +181,13 @@ static void kvm_prepare_system_event(struct kvm_vcpu *vcpu, u32 type) tmp->arch.power_off = true; kvm_make_all_cpus_request(vcpu->kvm, KVM_REQ_SLEEP); + /* + * If the MMIO guard was enabled, we pay the price of a full + * unmap to get back to a sane state (and clear the flag). + */ + if (test_and_clear_bit(KVM_ARCH_FLAG_MMIO_GUARD, &vcpu->kvm->arch.flags)) + stage2_unmap_vm(vcpu->kvm); + memset(&vcpu->run->system_event, 0, sizeof(vcpu->run->system_event)); vcpu->run->system_event.type = type; vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
--
2.30.2
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