diff options
| author | David Brazdil <dbrazdil@google.com> | 2020-12-02 19:41:12 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2020-12-04 11:08:34 +0100 |
| commit | eeeee7193df015074c8302381356e8e617a5e2b0 (patch) | |
| tree | f95c9cfefa430270e54dbe1717b91ff913e82dda /arch/arm64/kvm/arm.c | |
| parent | KVM: arm64: Add SMC handler in nVHE EL2 (diff) | |
| download | linux-eeeee7193df015074c8302381356e8e617a5e2b0.tar.xz linux-eeeee7193df015074c8302381356e8e617a5e2b0.zip | |
KVM: arm64: Bootstrap PSCI SMC handler in nVHE EL2
Add a handler of PSCI SMCs in nVHE hyp code. The handler is initialized
with the version used by the host's PSCI driver and the function IDs it
was configured with. If the SMC function ID matches one of the
configured PSCI calls (for v0.1) or falls into the PSCI function ID
range (for v0.2+), the SMC is handled by the PSCI handler. For now, all
SMCs return PSCI_RET_NOT_SUPPORTED.
Signed-off-by: David Brazdil <dbrazdil@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20201202184122.26046-17-dbrazdil@google.com
Diffstat (limited to 'arch/arm64/kvm/arm.c')
| -rw-r--r-- | arch/arm64/kvm/arm.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index bcd6e5d3c89a..aa40bef09dfc 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -19,6 +19,7 @@ #include <linux/kvm_irqfd.h> #include <linux/irqbypass.h> #include <linux/sched/stat.h> +#include <linux/psci.h> #include <trace/events/kvm.h> #define CREATE_TRACE_POINTS @@ -65,6 +66,8 @@ 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]; +extern u32 kvm_nvhe_sym(kvm_host_psci_version); +extern struct psci_0_1_function_ids kvm_nvhe_sym(kvm_host_psci_0_1_function_ids); int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu) { @@ -1522,6 +1525,22 @@ static void init_cpu_logical_map(void) kvm_nvhe_sym(__cpu_logical_map)[cpu] = cpu_logical_map(cpu); } +static bool init_psci_relay(void) +{ + /* + * If PSCI has not been initialized, protected KVM cannot install + * itself on newly booted CPUs. + */ + if (!psci_ops.get_version) { + kvm_err("Cannot initialize protected mode without PSCI\n"); + return false; + } + + kvm_nvhe_sym(kvm_host_psci_version) = psci_ops.get_version(); + kvm_nvhe_sym(kvm_host_psci_0_1_function_ids) = get_psci_0_1_function_ids(); + return true; +} + static int init_common_resources(void) { return kvm_set_ipa_limit(); @@ -1700,9 +1719,13 @@ static int init_hyp_mode(void) } } - if (is_protected_kvm_enabled()) + if (is_protected_kvm_enabled()) { init_cpu_logical_map(); + if (!init_psci_relay()) + goto out_err; + } + return 0; out_err: |