linux-kernel - [RFC PATCH 07/14] KVM: SVM: Move shared SVM data structures into VAC

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Date:   Tue,  7 Nov 2023 20:19:55 +0000
From:   Anish Ghulati <aghulati@...gle.com>
To:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        hpa@...or.com, Vitaly Kuznetsov <vkuznets@...hat.com>,
        peterz@...radead.org, paulmck@...nel.org,
        Mark Rutland <mark.rutland@....com>
Cc:     Anish Ghulati <aghulati@...gle.com>,
        Venkatesh Srinivas <venkateshs@...omium.org>
Subject: [RFC PATCH 07/14] KVM: SVM: Move shared SVM data structures into VAC

Move svm_cpu_data into VAC.

TODO: Explain why this data should be shared between KVMs and should be
made global by moving it into VAC.

Signed-off-by: Venkatesh Srinivas <venkateshs@...omium.org>
Signed-off-by: Anish Ghulati <aghulati@...gle.com>
---
 arch/x86/kvm/svm/svm.c |  9 ++++++++-
 arch/x86/kvm/svm/svm.h | 16 +---------------
 arch/x86/kvm/svm/vac.c |  5 +++++
 arch/x86/kvm/svm/vac.h | 23 +++++++++++++++++++++++
 4 files changed, 37 insertions(+), 16 deletions(-)
 create mode 100644 arch/x86/kvm/svm/vac.h

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index f0a5cc43c023..d53808d8ec37 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -234,7 +234,14 @@ static u8 rsm_ins_bytes[] = "\x0f\xaa";
 
 static unsigned long iopm_base;
 
-DEFINE_PER_CPU(struct svm_cpu_data, svm_data);
+struct kvm_ldttss_desc {
+	u16 limit0;
+	u16 base0;
+	unsigned base1:8, type:5, dpl:2, p:1;
+	unsigned limit1:4, zero0:3, g:1, base2:8;
+	u32 base3;
+	u32 zero1;
+} __attribute__((packed));
 
 /*
  * Only MSR_TSC_AUX is switched via the user return hook.  EFER is switched via
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 436632706848..7fc652b1b92d 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -24,6 +24,7 @@
 
 #include "cpuid.h"
 #include "kvm_cache_regs.h"
+#include "vac.h"
 
 #define __sme_page_pa(x) __sme_set(page_to_pfn(x) << PAGE_SHIFT)
 
@@ -291,21 +292,6 @@ struct vcpu_svm {
 	bool guest_gif;
 };
 
-struct svm_cpu_data {
-	u64 asid_generation;
-	u32 max_asid;
-	u32 next_asid;
-	u32 min_asid;
-
-	struct page *save_area;
-	unsigned long save_area_pa;
-
-	struct vmcb *current_vmcb;
-
-	/* index = sev_asid, value = vmcb pointer */
-	struct vmcb **sev_vmcbs;
-};
-
 DECLARE_PER_CPU(struct svm_cpu_data, svm_data);
 
 void recalc_intercepts(struct vcpu_svm *svm);
diff --git a/arch/x86/kvm/svm/vac.c b/arch/x86/kvm/svm/vac.c
index 4aabf16d2fc0..3e79279c6b34 100644
--- a/arch/x86/kvm/svm/vac.c
+++ b/arch/x86/kvm/svm/vac.c
@@ -1,2 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 
+#include <linux/percpu-defs.h>
+
+#include "vac.h"
+
+DEFINE_PER_CPU(struct svm_cpu_data, svm_data);
diff --git a/arch/x86/kvm/svm/vac.h b/arch/x86/kvm/svm/vac.h
new file mode 100644
index 000000000000..2d42e4472703
--- /dev/null
+++ b/arch/x86/kvm/svm/vac.h
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+#ifndef ARCH_X86_KVM_SVM_VAC_H
+#define ARCH_X86_KVM_SVM_VAC_H
+
+#include "../vac.h"
+
+struct svm_cpu_data {
+	u64 asid_generation;
+	u32 max_asid;
+	u32 next_asid;
+	u32 min_asid;
+
+	struct page *save_area;
+	unsigned long save_area_pa;
+
+	struct vmcb *current_vmcb;
+
+	/* index = sev_asid, value = vmcb pointer */
+	struct vmcb **sev_vmcbs;
+};
+
+#endif // ARCH_X86_KVM_SVM_VAC_H
-- 
2.42.0.869.gea05f2083d-goog