linux-kernel - [PATCH 1/2] x86/kvm: revert commit 76b4f357d0e7d8f6f00

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Message-Id: <20210913135745.13944-2-jgross@suse.com>
Date:   Mon, 13 Sep 2021 15:57:43 +0200
From:   Juergen Gross <jgross@...e.com>
To:     kvm@...r.kernel.org, x86@...nel.org, linux-kernel@...r.kernel.org
Cc:     Juergen Gross <jgross@...e.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Eduardo Habkost <ehabkost@...hat.com>
Subject: [PATCH 1/2] x86/kvm: revert commit 76b4f357d0e7d8f6f00

Commit 76b4f357d0e7d8f6f00 ("x86/kvm: fix vcpu-id indexed array sizes")
has wrong reasoning, as KVM_MAX_VCPU_ID is not defining the maximum
allowed vcpu-id as its name suggests, but the number of vcpu-ids.

So revert this patch again.

Suggested-by: Eduardo Habkost <ehabkost@...hat.com>
Signed-off-by: Juergen Gross <jgross@...e.com>
---
 arch/x86/kvm/ioapic.c | 2 +-
 arch/x86/kvm/ioapic.h | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/ioapic.c b/arch/x86/kvm/ioapic.c
index ff005fe738a4..698969e18fe3 100644
--- a/arch/x86/kvm/ioapic.c
+++ b/arch/x86/kvm/ioapic.c
@@ -96,7 +96,7 @@ static unsigned long ioapic_read_indirect(struct kvm_ioapic *ioapic,
 static void rtc_irq_eoi_tracking_reset(struct kvm_ioapic *ioapic)
 {
 	ioapic->rtc_status.pending_eoi = 0;
-	bitmap_zero(ioapic->rtc_status.dest_map.map, KVM_MAX_VCPU_ID + 1);
+	bitmap_zero(ioapic->rtc_status.dest_map.map, KVM_MAX_VCPU_ID);
 }
 
 static void kvm_rtc_eoi_tracking_restore_all(struct kvm_ioapic *ioapic);
diff --git a/arch/x86/kvm/ioapic.h b/arch/x86/kvm/ioapic.h
index bbd4a5d18b5d..27e61ff3ac3e 100644
--- a/arch/x86/kvm/ioapic.h
+++ b/arch/x86/kvm/ioapic.h
@@ -39,13 +39,13 @@ struct kvm_vcpu;
 
 struct dest_map {
 	/* vcpu bitmap where IRQ has been sent */
-	DECLARE_BITMAP(map, KVM_MAX_VCPU_ID + 1);
+	DECLARE_BITMAP(map, KVM_MAX_VCPU_ID);
 
 	/*
 	 * Vector sent to a given vcpu, only valid when
 	 * the vcpu's bit in map is set
 	 */
-	u8 vectors[KVM_MAX_VCPU_ID + 1];
+	u8 vectors[KVM_MAX_VCPU_ID];
 };
 
 
-- 
2.26.2