linux-kernel - [PATCH v2 1/2] KVM: x86: Shrink struct kvm

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Message-Id: <20230217193336.15278-2-minipli@grsecurity.net>
Date:   Fri, 17 Feb 2023 20:33:35 +0100
From:   Mathias Krause <minipli@...ecurity.net>
To:     kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Mathias Krause <minipli@...ecurity.net>
Subject: [PATCH v2 1/2] KVM: x86: Shrink struct kvm_pmu

Move the 'version' member to the beginning of the structure to reuse an
existing hole instead of introducing another one.

This allows us to save 8 bytes for 64 bit builds.

Signed-off-by: Mathias Krause <minipli@...ecurity.net>
---
 arch/x86/include/asm/kvm_host.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 6aaae18f1854..43329c60a6b5 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -516,6 +516,7 @@ struct kvm_pmc {
 #define KVM_PMC_MAX_FIXED	3
 #define KVM_AMD_PMC_MAX_GENERIC	6
 struct kvm_pmu {
+	u8 version;
 	unsigned nr_arch_gp_counters;
 	unsigned nr_arch_fixed_counters;
 	unsigned available_event_types;
@@ -528,7 +529,6 @@ struct kvm_pmu {
 	u64 global_ovf_ctrl_mask;
 	u64 reserved_bits;
 	u64 raw_event_mask;
-	u8 version;
 	struct kvm_pmc gp_counters[KVM_INTEL_PMC_MAX_GENERIC];
 	struct kvm_pmc fixed_counters[KVM_PMC_MAX_FIXED];
 	struct irq_work irq_work;
-- 
2.39.1