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base: extend PD session by system_control_cap

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Per Affinity::Location a system control cap can be requested. The capability
provides an RPC interface to request and set Cpu_state, as provided by the
former Pd::managing_system(Cpu_state) method. Invocation of those system
control capabilities then *can* (see below) be executed on the desired CPU
as described by Affinity::Location.

The system control cap will be invalid for kernels that don't support
system_control/managing_system functionality at all.

The system control cap will be ever by the same, e.g. ignoring the
Affinity::Location parameter, if the used kernel doesn't support or doesn't
require the feature to execute the system control per CPU.

The commit is a preparation step to add guarded and selective x86 MSR
access per CPU.

Fixes #5009
This commit is contained in:
Alexander Boettcher
2023-09-26 10:55:06 +02:00
committed by Christian Helmuth
parent ffc25fde53
commit 916bd88e5e
15 changed files with 220 additions and 38 deletions
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6
repos/base/src/core/main.cc
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@@ -29,6 +29,7 @@
#include <core_env.h>
#include <core_service.h>
#include <signal_transmitter.h>
#include <system_control.h>
#include <rom_root.h>
#include <rm_root.h>
#include <cpu_root.h>
@@ -255,6 +256,8 @@ void Genode::bootstrap_component(Genode::Platform &)
using Trace_root = Core::Trace::Root;
using Trace_session_component = Core::Trace::Session_component;
static Core::System_control &system_control = init_system_control(sliced_heap, ep);
static Rom_root rom_root (ep, ep, platform().rom_fs(), sliced_heap);
static Rm_root rm_root (ep, sliced_heap, core_ram_alloc, local_rm, pager_ep);
static Cpu_root cpu_root (core_ram_alloc, local_rm, ep, ep, pager_ep,
@@ -262,7 +265,8 @@ void Genode::bootstrap_component(Genode::Platform &)
static Pd_root pd_root (ep, core_env().signal_ep(), pager_ep,
platform().ram_alloc(),
local_rm, sliced_heap,
platform_specific().core_mem_alloc());
platform_specific().core_mem_alloc(),
system_control);
static Log_root log_root (ep, sliced_heap);
static Io_mem_root io_mem_root (ep, ep, platform().io_mem_alloc(),
platform().ram_alloc(), sliced_heap);