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[PATCH v2 22/38] x86/pvclock: WARN if pvclock's valid_flags are overwritten
- To: Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, x86@xxxxxxxxxx, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Sean Christopherson <seanjc@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>, Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>, Wei Liu <wei.liu@xxxxxxxxxx>, Dexuan Cui <decui@xxxxxxxxxxxxx>, Ajay Kaher <ajay.kaher@xxxxxxxxxxxx>, Jan Kiszka <jan.kiszka@xxxxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>, John Stultz <jstultz@xxxxxxxxxx>
- From: Sean Christopherson <seanjc@xxxxxxxxxx>
- Date: Wed, 26 Feb 2025 18:18:38 -0800
- Cc: linux-kernel@xxxxxxxxxxxxxxx, linux-coco@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, Tom Lendacky <thomas.lendacky@xxxxxxx>, Nikunj A Dadhania <nikunj@xxxxxxx>
- Delivery-date: Thu, 27 Feb 2025 02:25:51 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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.
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
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;
}
--
2.48.1.711.g2feabab25a-goog
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