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| author | David Brazdil <dbrazdil@google.com> | 2020-12-02 21:41:10 +0300 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2020-12-04 13:08:34 +0300 |
| commit | 94f5e8a4642aedb19ca73f534372d7ed65e1c84e (patch) | |
| tree | 953eef01f576a913fa3088803ae225dd2b7ba35e /arch/arm64/kvm/arm.c | |
| parent | 687413d34d4aa72103de3e545f431f480dd21d7f (diff) | |
| download | linux-94f5e8a4642aedb19ca73f534372d7ed65e1c84e.tar.xz | |
KVM: arm64: Create nVHE copy of cpu_logical_map
When KVM starts validating host's PSCI requests, it will need to map
MPIDR back to the CPU ID. To this end, copy cpu_logical_map into nVHE
hyp memory when KVM is initialized.
Only copy the information for CPUs that are online at the point of KVM
initialization so that KVM rejects CPUs whose features were not checked
against the finalized capabilities.
Signed-off-by: David Brazdil <dbrazdil@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20201202184122.26046-15-dbrazdil@google.com
Diffstat (limited to 'arch/arm64/kvm/arm.c')
| -rw-r--r-- | arch/arm64/kvm/arm.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index ef519e482616..bcd6e5d3c89a 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -64,6 +64,8 @@ static bool vgic_present; static DEFINE_PER_CPU(unsigned char, kvm_arm_hardware_enabled); DEFINE_STATIC_KEY_FALSE(userspace_irqchip_in_use); +extern u64 kvm_nvhe_sym(__cpu_logical_map)[NR_CPUS]; + int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) { return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE; @@ -1506,6 +1508,20 @@ static inline void hyp_cpu_pm_exit(void) } #endif +static void init_cpu_logical_map(void) +{ + unsigned int cpu; + + /* + * Copy the MPIDR <-> logical CPU ID mapping to hyp. + * Only copy the set of online CPUs whose features have been chacked + * against the finalized system capabilities. The hypervisor will not + * allow any other CPUs from the `possible` set to boot. + */ + for_each_online_cpu(cpu) + kvm_nvhe_sym(__cpu_logical_map)[cpu] = cpu_logical_map(cpu); +} + static int init_common_resources(void) { return kvm_set_ipa_limit(); @@ -1684,6 +1700,9 @@ static int init_hyp_mode(void) } } + if (is_protected_kvm_enabled()) + init_cpu_logical_map(); + return 0; out_err: |