[PATCH v5 40/51] x86/pvclock: WARN if pvclock's valid_flags are overwritten
From: Sean Christopherson <seanjc@google.com>
Date: 2026-07-01 19:33:16
Also in:
kvm, linux-coco, linux-hyperv, lkml, virtualization, xen-devel
Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
WARN if the common PV clock valid_flags are overwritten; all PV clocks expect that they are the one and only PV clock, i.e. don't guard against another PV clock having modified the flags. Reviewed-by: David Woodhouse <redacted> Signed-off-by: Sean Christopherson <seanjc@google.com> --- arch/x86/kernel/pvclock.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/arch/x86/kernel/pvclock.c b/arch/x86/kernel/pvclock.c
index a51adce67f92..8d098841a225 100644
--- a/arch/x86/kernel/pvclock.c
+++ b/arch/x86/kernel/pvclock.c@@ -21,6 +21,7 @@ static struct pvclock_vsyscall_time_info *pvti_cpu0_va __ro_after_init; void __init pvclock_set_flags(u8 flags) { + WARN_ON(valid_flags); valid_flags = flags; }
--
2.55.0.rc0.799.gd6f94ed593-goog