x86/microcode: Add per CPU control field

Add a per CPU control field to ucode_ctrl and define constants for it
which are going to be used to control the loading state machine.

In theory this could be a global control field, but a global control does
not cover the following case:

 15 primary CPUs load microcode successfully
  1 primary CPU fails and returns with an error code

With global control the sibling of the failed CPU would either try again or
the whole operation would be aborted with the consequence that the 15
siblings do not invoke the apply path and end up with inconsistent software
state. The result in dmesg would be inconsistent too.

There are two additional fields added and initialized:

ctrl_cpu and secondaries. ctrl_cpu is the CPU number of the primary thread
for now, but with the upcoming uniform loading at package or system scope
this will be one CPU per package or just one CPU. Secondaries hands the
control CPU a CPU mask which will be required to release the secondary CPUs
out of the wait loop.

Preparatory change for implementing a properly split control flow for
primary and secondary CPUs.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20231002115903.319959519@linutronix.de

diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index 67b8932b9c801a28edb4f951e8f4ffaaa2c6529e..001c0048e16a62a1713bdf2b9f07115ece6a37f8 100644 (file)
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -252,8 +252,19 @@ static struct platform_device      *microcode_pdev;
  *   requirement can be relaxed in the future. Right now, this is conservative
  *   and good.
  */
+enum sibling_ctrl {
+       /* Spinwait with timeout */
+       SCTRL_WAIT,
+       /* Invoke the microcode_apply() callback */
+       SCTRL_APPLY,
+       /* Proceed without invoking the microcode_apply() callback */
+       SCTRL_DONE,
+};
+
 struct microcode_ctrl {
+       enum sibling_ctrl       ctrl;
        enum ucode_state        result;
+       unsigned int            ctrl_cpu;
 };
 
 static DEFINE_PER_CPU(struct microcode_ctrl, ucode_ctrl);
@@ -398,7 +409,7 @@ static int load_late_stop_cpus(void)
  */
 static bool setup_cpus(void)
 {
-       struct microcode_ctrl ctrl = { .result = -1, };
+       struct microcode_ctrl ctrl = { .ctrl = SCTRL_WAIT, .result = -1, };
        unsigned int cpu;
 
        for_each_cpu_and(cpu, cpu_present_mask, &cpus_booted_once_mask) {
@@ -408,7 +419,12 @@ static bool setup_cpus(void)
                                return false;
                        }
                }
-               /* Initialize the per CPU state */
+
+               /*
+                * Initialize the per CPU state. This is core scope for now,
+                * but prepared to take package or system scope into account.
+                */
+               ctrl.ctrl_cpu = cpumask_first(topology_sibling_cpumask(cpu));
                per_cpu(ucode_ctrl, cpu) = ctrl;
        }
        return true;