linux-kernel - [PATCH 06/19] KVM: SVM: Get x2APIC logical dest bitmap from ICRH[15:0], not ICHR[31:16]

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Message-ID: <20220831003506.4117148-7-seanjc@google.com>
Date:   Wed, 31 Aug 2022 00:34:53 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        Li RongQing <lirongqing@...du.com>
Subject: [PATCH 06/19] KVM: SVM: Get x2APIC logical dest bitmap from
 ICRH[15:0], not ICHR[31:16]

When attempting a fast kick for x2AVIC, get the destination bitmap from
ICR[15:0], not ICHR[31:16].  The upper 16 bits contain the cluster, the
lower 16 bits hold the bitmap.

Fixes: 603ccef42ce9 ("KVM: x86: SVM: fix avic_kick_target_vcpus_fast")
Cc: Maxim Levitsky <mlevitsk@...hat.com>
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/svm/avic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
index 3ace0f2f52f0..3c333cd2e752 100644
--- a/arch/x86/kvm/svm/avic.c
+++ b/arch/x86/kvm/svm/avic.c
@@ -368,7 +368,7 @@ static int avic_kick_target_vcpus_fast(struct kvm *kvm, struct kvm_lapic *source
 
 		if (apic_x2apic_mode(source)) {
 			/* 16 bit dest mask, 16 bit cluster id */
-			bitmap = dest & 0xFFFF0000;
+			bitmap = dest & 0xFFFF;
 			cluster = (dest >> 16) << 4;
 		} else if (kvm_lapic_get_reg(source, APIC_DFR) == APIC_DFR_FLAT) {
 			/* 8 bit dest mask*/
-- 
2.37.2.672.g94769d06f0-goog