From af7cc7d1ee422a612f6785e347a893d44cc892ea Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Tue, 12 Jul 2011 03:22:46 +0800 Subject: [PATCH] KVM: x86: introduce vcpu_mmio_gva_to_gpa to cleanup the code Introduce vcpu_mmio_gva_to_gpa to translate the gva to gpa, we can use it to cleanup the code between read emulation and write emulation Signed-off-by: Xiao Guangrong Signed-off-by: Avi Kivity --- arch/x86/kvm/x86.c | 42 +++++++++++++++++++++++++++++++----------- 1 file changed, 31 insertions(+), 11 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index c96cdc0..a1dbd04 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -4010,6 +4010,27 @@ out: } EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system); +static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva, + gpa_t *gpa, struct x86_exception *exception, + bool write) +{ + u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0; + + if (write) + access |= PFERR_WRITE_MASK; + + *gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception); + + if (*gpa == UNMAPPED_GVA) + return -1; + + /* For APIC access vmexit */ + if ((*gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) + return 1; + + return 0; +} + static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt, unsigned long addr, void *val, @@ -4017,8 +4038,8 @@ static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt, struct x86_exception *exception) { struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt); - gpa_t gpa; - int handled; + gpa_t gpa; + int handled, ret; if (vcpu->mmio_read_completed) { memcpy(val, vcpu->mmio_data, bytes); @@ -4028,13 +4049,12 @@ static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt, return X86EMUL_CONTINUE; } - gpa = kvm_mmu_gva_to_gpa_read(vcpu, addr, exception); + ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, false); - if (gpa == UNMAPPED_GVA) + if (ret < 0) return X86EMUL_PROPAGATE_FAULT; - /* For APIC access vmexit */ - if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) + if (ret) goto mmio; if (kvm_read_guest_virt(ctxt, addr, val, bytes, exception) @@ -4085,16 +4105,16 @@ static int emulator_write_emulated_onepage(unsigned long addr, struct x86_exception *exception, struct kvm_vcpu *vcpu) { - gpa_t gpa; - int handled; + gpa_t gpa; + int handled, ret; - gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, exception); + ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, true); - if (gpa == UNMAPPED_GVA) + if (ret < 0) return X86EMUL_PROPAGATE_FAULT; /* For APIC access vmexit */ - if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE) + if (ret) goto mmio; if (emulator_write_phys(vcpu, gpa, val, bytes)) -- 2.7.4