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From 7f55774489d2f12a23f2ac0f516b62e2709cea99 Mon Sep 17 00:00:00 2001
From: Andrew Cooper <andrew.cooper3@citrix.com>
Date: Fri, 31 Mar 2023 08:33:28 +0200
Subject: [PATCH 81/89] x86/ucode: Fix error paths control_thread_fn()
These two early exits skipped re-enabling the watchdog, restoring the NMI
callback, and clearing the nmi_patch global pointer. Always execute the tail
of the function on the way out.
Fixes: 8dd4dfa92d62 ("x86/microcode: Synchronize late microcode loading")
Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Sergey Dyasli <sergey.dyasli@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
master commit: fc2e1f3aad602a66c14b8285a1bd38a82f8fd02d
master date: 2023-03-28 11:57:56 +0100
---
xen/arch/x86/cpu/microcode/core.c | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/xen/arch/x86/cpu/microcode/core.c b/xen/arch/x86/cpu/microcode/core.c
index 2497630bbe..c760723e4f 100644
--- a/xen/arch/x86/cpu/microcode/core.c
+++ b/xen/arch/x86/cpu/microcode/core.c
@@ -490,10 +490,7 @@ static int control_thread_fn(const struct microcode_patch *patch)
ret = wait_for_condition(wait_cpu_callin, num_online_cpus(),
MICROCODE_CALLIN_TIMEOUT_US);
if ( ret )
- {
- set_state(LOADING_EXIT);
- return ret;
- }
+ goto out;
/* Control thread loads ucode first while others are in NMI handler. */
ret = alternative_call(ucode_ops.apply_microcode, patch);
@@ -505,8 +502,7 @@ static int control_thread_fn(const struct microcode_patch *patch)
{
printk(XENLOG_ERR
"Late loading aborted: CPU%u failed to update ucode\n", cpu);
- set_state(LOADING_EXIT);
- return ret;
+ goto out;
}
/* Let primary threads load the given ucode update */
@@ -537,6 +533,7 @@ static int control_thread_fn(const struct microcode_patch *patch)
}
}
+ out:
/* Mark loading is done to unblock other threads */
set_state(LOADING_EXIT);
--
2.40.0
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