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Subject[PATCH 1/3] KVM: VMX: Introduce per-VM I/O permission bitmaps
Date
From: Wanpeng Li <wanpengli@tencent.com>

This patch introduces per-VM I/O permission bitmaps, it will be used by
later patches.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Tim Shearer <tshearer@advaoptical.com>
Cc: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
---
arch/x86/kvm/vmx.c | 34 +++++++++++++++++++++++++++++++---
1 file changed, 31 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 5b49ad4..ebf1140 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -189,12 +189,19 @@ module_param(ple_window_max, uint, 0444);

extern const ulong vmx_return;

+enum {
+ VMX_IO_BITMAP_A,
+ VMX_IO_BITMAP_B,
+ VMX_IO_BITMAP_NR
+};
+
struct kvm_vmx {
struct kvm kvm;

unsigned int tss_addr;
bool ept_identity_pagetable_done;
gpa_t ept_identity_map_addr;
+ unsigned long *vmx_io_bitmap[VMX_IO_BITMAP_NR];
};

#define NR_AUTOLOAD_MSRS 8
@@ -3963,7 +3970,7 @@ static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
#endif
CPU_BASED_CR3_LOAD_EXITING |
CPU_BASED_CR3_STORE_EXITING |
- CPU_BASED_UNCOND_IO_EXITING |
+ CPU_BASED_USE_IO_BITMAPS |
CPU_BASED_MOV_DR_EXITING |
CPU_BASED_USE_TSC_OFFSETING |
CPU_BASED_MWAIT_EXITING |
@@ -5940,6 +5947,12 @@ static void vmx_vcpu_setup(struct vcpu_vmx *vmx)
#endif
int i;

+ /* I/O */
+ vmcs_write64(IO_BITMAP_A,
+ __pa(to_kvm_vmx(vmx->vcpu.kvm)->vmx_io_bitmap[VMX_IO_BITMAP_A]));
+ vmcs_write64(IO_BITMAP_B,
+ __pa(to_kvm_vmx(vmx->vcpu.kvm)->vmx_io_bitmap[VMX_IO_BITMAP_B]));
+
if (enable_shadow_vmcs) {
vmcs_write64(VMREAD_BITMAP, __pa(vmx_vmread_bitmap));
vmcs_write64(VMWRITE_BITMAP, __pa(vmx_vmwrite_bitmap));
@@ -10093,9 +10106,24 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)

static int vmx_vm_init(struct kvm *kvm)
{
+ int i;
+ struct kvm_vmx *kvm_vmx = to_kvm_vmx(kvm);
+
if (!ple_gap)
kvm->arch.pause_in_guest = true;
+
+ for (i = 0; i < VMX_IO_BITMAP_NR; i++) {
+ kvm_vmx->vmx_io_bitmap[i] = (unsigned long *)__get_free_page(GFP_KERNEL);
+ if (!kvm_vmx->vmx_io_bitmap[i])
+ goto out;
+ memset(kvm_vmx->vmx_io_bitmap[i], 0xff, PAGE_SIZE);
+ }
return 0;
+
+out:
+ for (i = 0; i < VMX_IO_BITMAP_NR; i++)
+ free_page((unsigned long)kvm_vmx->vmx_io_bitmap[i]);
+ return -ENOMEM;
}

static void __init vmx_check_processor_compat(void *rtn)
@@ -11128,8 +11156,8 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
}

/*
- * A vmexit (to either L1 hypervisor or L0 userspace) is always needed
- * for I/O port accesses.
+ * Merging of IO bitmap not currently supported.
+ * Rather, exit every time.
*/
exec_control &= ~CPU_BASED_USE_IO_BITMAPS;
exec_control |= CPU_BASED_UNCOND_IO_EXITING;
--
2.7.4
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