From: Sean Christopherson <seanjc@google.com>
To: Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Yosry Ahmed <yosry@kernel.org>,
Shivansh Dhiman <shivansh.dhiman@amd.com>,
Nikunj A Dadhania <nikunj@amd.com>,
Ravi Bangoria <ravi.bangoria@amd.com>,
Tom Lendacky <thomas.lendacky@amd.com>
Subject: [PATCH v5 03/12] KVM: Return an "unsigned long", not "u64" for the fixed-1 DR6 bits
Date: Tue, 29 Sep 2026 18:13:04 -0700 [thread overview]
Message-ID: <20260930011313.3197688-4-seanjc@google.com> (raw)
In-Reply-To: <20260930011313.3197688-1-seanjc@google.com>
Return an "unsigned long" instead of a "u64" from the helper to get the
fixed-1 DR6 bits, as debug registers are natural width registers, not
64-bit registers.
No functional change intended (the fixed-1 bits only set bits in 31:0, and
the sole caller truncates the value to an "unsigned long").
Signed-off-by: Sean Christopherson <seanjc@google.com>
---
arch/x86/kvm/regs.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kvm/regs.c b/arch/x86/kvm/regs.c
index 62075443f6b9..f74a29621661 100644
--- a/arch/x86/kvm/regs.c
+++ b/arch/x86/kvm/regs.c
@@ -772,15 +772,16 @@ void kvm_update_dr7(struct kvm_vcpu *vcpu)
}
EXPORT_SYMBOL_FOR_KVM_INTERNAL(kvm_update_dr7);
-static u64 kvm_get_dr6_fixed_1(struct kvm_vcpu *vcpu)
+static unsigned long kvm_get_dr6_fixed_1(struct kvm_vcpu *vcpu)
{
- u64 fixed = DR6_FIXED_1;
+ unsigned long fixed = DR6_FIXED_1;
if (!guest_cpu_cap_has(vcpu, X86_FEATURE_RTM))
fixed |= DR6_RTM;
if (!guest_cpu_cap_has(vcpu, X86_FEATURE_BUS_LOCK_DETECT))
fixed |= DR6_BUS_LOCK;
+
return fixed;
}
--
2.56.0.rc1.315.gc6ed9934b7-goog
next prev parent reply other threads:[~2026-09-30 1:13 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-30 1:13 [PATCH v5 00/12] KVM: x86: Bus Lock Detect fixes and SVM support Sean Christopherson
2026-09-30 1:13 ` [PATCH v5 01/12] KVM: x86: Preserve DR6.BLD (Bus Lock Detect) when delivering #DB payload Sean Christopherson
2026-09-30 1:13 ` [PATCH v5 02/12] KVM: x86: Rename kvm_dr6_fixed() => kvm_get_dr6_fixed_1() Sean Christopherson
2026-09-30 1:13 ` Sean Christopherson [this message]
2026-09-30 1:13 ` [PATCH v5 04/12] KVM: x86: Force fixed-1 bits in DR6 after synchronizing with hardware Sean Christopherson
2026-09-30 1:13 ` [PATCH v5 05/12] KVM: x86: WARN if fixed-1 DR6 bits aren't already set when delivering payload Sean Christopherson
2026-09-30 1:13 ` [PATCH v5 06/12] KVM: x86: Kill off DR6_FIXED_1 to prevent future misuse Sean Christopherson
2026-09-30 1:13 ` [PATCH v5 07/12] KVM: SVM: Add helper to query if LBR virtualization needs to be enabled Sean Christopherson
2026-09-30 1:13 ` [PATCH v5 08/12] KVM: nSVM: Disable LBRV in nested control cache when unsupported Sean Christopherson
2026-09-30 1:13 ` [PATCH v5 09/12] KVM: nSVM: Open code check on LBR virtualization being enabled in vmcb12 Sean Christopherson
2026-09-30 1:13 ` [PATCH v5 10/12] KVM: nSVM: Don't assume all active-low bits DR6 are fixed-1 Sean Christopherson
2026-09-30 1:13 ` [PATCH v5 11/12] KVM: SVM: Add a vCPU-aware helper to get supported DEBUGCTL bits Sean Christopherson
2026-09-30 1:13 ` [PATCH v5 12/12] KVM: SVM: Add support for virtualizating Bus Lock Detect Sean Christopherson
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