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Date: Thu, 29 Sep 2016 22:41:33 +0200
From: Radim Krčmář <rkrcmar@...hat.com>
To: linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc: Paolo Bonzini <pbonzini@...hat.com>,
Wanpeng Li <kernellwp@...il.com>
Subject: [PATCH v2 3/3] KVM: VMX: refactor setup of global page-sized bitmaps
We've had 10 page-sized bitmaps that were being allocated and freed one
by one when we could just use a cycle.
Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>
---
arch/x86/kvm/vmx.c | 120 +++++++++++++++++------------------------------------
1 file changed, 38 insertions(+), 82 deletions(-)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 159cc65755ec..bfd41149c377 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -921,16 +921,32 @@ static DEFINE_PER_CPU(struct desc_ptr, host_gdt);
static DEFINE_PER_CPU(struct list_head, blocked_vcpu_on_cpu);
static DEFINE_PER_CPU(spinlock_t, blocked_vcpu_on_cpu_lock);
-static unsigned long *vmx_io_bitmap_a;
-static unsigned long *vmx_io_bitmap_b;
-static unsigned long *vmx_msr_bitmap_legacy;
-static unsigned long *vmx_msr_bitmap_longmode;
-static unsigned long *vmx_msr_bitmap_legacy_x2apic_apicv;
-static unsigned long *vmx_msr_bitmap_longmode_x2apic_apicv;
-static unsigned long *vmx_msr_bitmap_legacy_x2apic;
-static unsigned long *vmx_msr_bitmap_longmode_x2apic;
-static unsigned long *vmx_vmread_bitmap;
-static unsigned long *vmx_vmwrite_bitmap;
+enum {
+ VMX_IO_BITMAP_A,
+ VMX_IO_BITMAP_B,
+ VMX_MSR_BITMAP_LEGACY,
+ VMX_MSR_BITMAP_LONGMODE,
+ VMX_MSR_BITMAP_LEGACY_X2APIC_APICV,
+ VMX_MSR_BITMAP_LONGMODE_X2APIC_APICV,
+ VMX_MSR_BITMAP_LEGACY_X2APIC,
+ VMX_MSR_BITMAP_LONGMODE_X2APIC,
+ VMX_VMREAD_BITMAP,
+ VMX_VMWRITE_BITMAP,
+ VMX_BITMAP_NR
+};
+
+static unsigned long *vmx_bitmap[VMX_BITMAP_NR];
+
+#define vmx_io_bitmap_a (vmx_bitmap[VMX_IO_BITMAP_A])
+#define vmx_io_bitmap_b (vmx_bitmap[VMX_IO_BITMAP_B])
+#define vmx_msr_bitmap_legacy (vmx_bitmap[VMX_MSR_BITMAP_LEGACY])
+#define vmx_msr_bitmap_longmode (vmx_bitmap[VMX_MSR_BITMAP_LONGMODE])
+#define vmx_msr_bitmap_legacy_x2apic_apicv (vmx_bitmap[VMX_MSR_BITMAP_LEGACY_X2APIC_APICV])
+#define vmx_msr_bitmap_longmode_x2apic_apicv (vmx_bitmap[VMX_MSR_BITMAP_LONGMODE_X2APIC_APICV])
+#define vmx_msr_bitmap_legacy_x2apic (vmx_bitmap[VMX_MSR_BITMAP_LEGACY_X2APIC])
+#define vmx_msr_bitmap_longmode_x2apic (vmx_bitmap[VMX_MSR_BITMAP_LONGMODE_X2APIC])
+#define vmx_vmread_bitmap (vmx_bitmap[VMX_VMREAD_BITMAP])
+#define vmx_vmwrite_bitmap (vmx_bitmap[VMX_VMWRITE_BITMAP])
static bool cpu_has_load_ia32_efer;
static bool cpu_has_load_perf_global_ctrl;
@@ -6313,50 +6329,13 @@ static __init int hardware_setup(void)
for (i = 0; i < ARRAY_SIZE(vmx_msr_index); ++i)
kvm_define_shared_msr(i, vmx_msr_index[i]);
- vmx_io_bitmap_a = (unsigned long *)__get_free_page(GFP_KERNEL);
- if (!vmx_io_bitmap_a)
- return r;
+ for (i = 0; i < VMX_BITMAP_NR; i++) {
+ vmx_bitmap[i] = (unsigned long *)__get_free_page(GFP_KERNEL);
+ if (!vmx_bitmap[i])
+ goto out;
+ }
vmx_io_bitmap_b = (unsigned long *)__get_free_page(GFP_KERNEL);
- if (!vmx_io_bitmap_b)
- goto out;
-
- vmx_msr_bitmap_legacy = (unsigned long *)__get_free_page(GFP_KERNEL);
- if (!vmx_msr_bitmap_legacy)
- goto out1;
-
- vmx_msr_bitmap_legacy_x2apic_apicv =
- (unsigned long *)__get_free_page(GFP_KERNEL);
- if (!vmx_msr_bitmap_legacy_x2apic_apicv)
- goto out2;
-
- vmx_msr_bitmap_legacy_x2apic =
- (unsigned long *)__get_free_page(GFP_KERNEL);
- if (!vmx_msr_bitmap_legacy_x2apic)
- goto out3;
-
- vmx_msr_bitmap_longmode = (unsigned long *)__get_free_page(GFP_KERNEL);
- if (!vmx_msr_bitmap_longmode)
- goto out4;
-
- vmx_msr_bitmap_longmode_x2apic_apicv =
- (unsigned long *)__get_free_page(GFP_KERNEL);
- if (!vmx_msr_bitmap_longmode_x2apic_apicv)
- goto out5;
-
- vmx_msr_bitmap_longmode_x2apic =
- (unsigned long *)__get_free_page(GFP_KERNEL);
- if (!vmx_msr_bitmap_longmode_x2apic)
- goto out6;
-
- vmx_vmread_bitmap = (unsigned long *)__get_free_page(GFP_KERNEL);
- if (!vmx_vmread_bitmap)
- goto out7;
-
- vmx_vmwrite_bitmap = (unsigned long *)__get_free_page(GFP_KERNEL);
- if (!vmx_vmwrite_bitmap)
- goto out8;
-
memset(vmx_vmread_bitmap, 0xff, PAGE_SIZE);
memset(vmx_vmwrite_bitmap, 0xff, PAGE_SIZE);
@@ -6374,7 +6353,7 @@ static __init int hardware_setup(void)
if (setup_vmcs_config(&vmcs_config) < 0) {
r = -EIO;
- goto out9;
+ goto out;
}
if (boot_cpu_has(X86_FEATURE_NX))
@@ -6516,42 +6495,19 @@ static __init int hardware_setup(void)
return alloc_kvm_area();
-out9:
- free_page((unsigned long)vmx_vmwrite_bitmap);
-out8:
- free_page((unsigned long)vmx_vmread_bitmap);
-out7:
- free_page((unsigned long)vmx_msr_bitmap_longmode_x2apic);
-out6:
- free_page((unsigned long)vmx_msr_bitmap_longmode_x2apic_apicv);
-out5:
- free_page((unsigned long)vmx_msr_bitmap_longmode);
-out4:
- free_page((unsigned long)vmx_msr_bitmap_legacy_x2apic);
-out3:
- free_page((unsigned long)vmx_msr_bitmap_legacy_x2apic_apicv);
-out2:
- free_page((unsigned long)vmx_msr_bitmap_legacy);
-out1:
- free_page((unsigned long)vmx_io_bitmap_b);
out:
- free_page((unsigned long)vmx_io_bitmap_a);
+ for (i = 0; i < VMX_BITMAP_NR; i++)
+ free_page((unsigned long)vmx_bitmap[i]);
return r;
}
static __exit void hardware_unsetup(void)
{
- free_page((unsigned long)vmx_msr_bitmap_legacy_x2apic_apicv);
- free_page((unsigned long)vmx_msr_bitmap_legacy_x2apic);
- free_page((unsigned long)vmx_msr_bitmap_longmode_x2apic_apicv);
- free_page((unsigned long)vmx_msr_bitmap_longmode_x2apic);
- free_page((unsigned long)vmx_msr_bitmap_legacy);
- free_page((unsigned long)vmx_msr_bitmap_longmode);
- free_page((unsigned long)vmx_io_bitmap_b);
- free_page((unsigned long)vmx_io_bitmap_a);
- free_page((unsigned long)vmx_vmwrite_bitmap);
- free_page((unsigned long)vmx_vmread_bitmap);
+ int i;
+
+ for (i = 0; i < VMX_BITMAP_NR; i++)
+ free_page((unsigned long)vmx_bitmap[i]);
free_kvm_area();
}
--
2.10.0
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