Merge branch kvm-arm64/mpidr-reset into kvmarm-master/next

* kvm-arm64/mpidr-reset:
  : .
  : Fixes for CLIDR_EL1 and MPIDR_EL1 being accidentally mutable across
  : a vcpu reset, courtesy of Oliver. From the cover letter:
  :
  : "For VM-wide feature ID registers we ensure they get initialized once for
  : the lifetime of a VM. On the other hand, vCPU-local feature ID registers
  : get re-initialized on every vCPU reset, potentially clobbering the
  : values userspace set up.
  :
  : MPIDR_EL1 and CLIDR_EL1 are the only registers in this space that we
  : allow userspace to modify for now. Clobbering the value of MPIDR_EL1 has
  : some disastrous side effects as the compressed index used by the
  : MPIDR-to-vCPU lookup table assumes MPIDR_EL1 is immutable after KVM_RUN.
  :
  : Series + reproducer test case to address the problem of KVM wiping out
  : userspace changes to these registers. Note that there are still some
  : differences between VM and vCPU scoped feature ID registers from the
  : perspective of userspace. We do not allow the value of VM-scope
  : registers to change after KVM_RUN, but vCPU registers remain mutable."
  : .
  KVM: selftests: arm64: Test vCPU-scoped feature ID registers
  KVM: selftests: arm64: Test that feature ID regs survive a reset
  KVM: selftests: arm64: Store expected register value in set_id_regs
  KVM: selftests: arm64: Rename helper in set_id_regs to imply VM scope
  KVM: arm64: Only reset vCPU-scoped feature ID regs once
  KVM: arm64: Reset VM feature ID regs from kvm_reset_sys_regs()
  KVM: arm64: Rename is_id_reg() to imply VM scope

Signed-off-by: Marc Zyngier <maz@kernel.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h
index fe94e96dced8..8170c04fde91 100644
--- a/arch/arm64/include/asm/kvm_host.h
+++ b/arch/arm64/include/asm/kvm_host.h
@@ -1318,6 +1318,8 @@ static inline bool __vcpu_has_feature(const struct kvm_arch *ka, int feature)
 
 #define vcpu_has_feature(v, f)	__vcpu_has_feature(&(v)->kvm->arch, (f))
 
+#define kvm_vcpu_initialized(v) vcpu_get_flag(vcpu, VCPU_INITIALIZED)
+
 int kvm_trng_call(struct kvm_vcpu *vcpu);
 #ifdef CONFIG_KVM
 extern phys_addr_t hyp_mem_base;