From 23611332938d8c7e87f7fbe6d3bc37f9c50d688f Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= Date: Thu, 29 Sep 2016 22:41:33 +0200 Subject: [PATCH] KVM: VMX: refactor setup of global page-sized bitmaps MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 --- 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 7964deb2f36e..4980911b9f14 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -920,16 +920,32 @@ 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; @@ -6287,50 +6303,13 @@ 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); @@ -6348,7 +6327,7 @@ 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)) @@ -6485,42 +6464,19 @@ 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(); }