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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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KVM: SVM: handle singlestep exception when skipping emulated instructions
kvm_skip_emulated_instruction handles the singlestep debug exception which is something we almost always want. This commit (specifically the change in rdmsr_interception) makes the debug.flat KVM unit test pass on AMD. Two call sites still call skip_emulated_instruction directly: * In svm_queue_exception where it's used only for moving the rip forward * In task_switch_interception which is analogous to handle_task_switch in VMX Signed-off-by: Ladi Prosek <lprosek@redhat.com> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
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@ -2267,7 +2267,7 @@ static int io_interception(struct vcpu_svm *svm)
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{
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struct kvm_vcpu *vcpu = &svm->vcpu;
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u32 io_info = svm->vmcb->control.exit_info_1; /* address size bug? */
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int size, in, string;
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int size, in, string, ret;
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unsigned port;
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++svm->vcpu.stat.io_exits;
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@ -2279,10 +2279,16 @@ static int io_interception(struct vcpu_svm *svm)
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port = io_info >> 16;
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size = (io_info & SVM_IOIO_SIZE_MASK) >> SVM_IOIO_SIZE_SHIFT;
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svm->next_rip = svm->vmcb->control.exit_info_2;
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skip_emulated_instruction(&svm->vcpu);
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ret = kvm_skip_emulated_instruction(&svm->vcpu);
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return in ? kvm_fast_pio_in(vcpu, size, port)
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: kvm_fast_pio_out(vcpu, size, port);
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/*
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* TODO: we might be squashing a KVM_GUESTDBG_SINGLESTEP-triggered
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* KVM_EXIT_DEBUG here.
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*/
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if (in)
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return kvm_fast_pio_in(vcpu, size, port) && ret;
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else
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return kvm_fast_pio_out(vcpu, size, port) && ret;
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}
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static int nmi_interception(struct vcpu_svm *svm)
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@ -3055,6 +3061,7 @@ static int vmload_interception(struct vcpu_svm *svm)
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{
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struct vmcb *nested_vmcb;
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struct page *page;
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int ret;
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if (nested_svm_check_permissions(svm))
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return 1;
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@ -3064,18 +3071,19 @@ static int vmload_interception(struct vcpu_svm *svm)
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return 1;
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svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
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skip_emulated_instruction(&svm->vcpu);
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ret = kvm_skip_emulated_instruction(&svm->vcpu);
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nested_svm_vmloadsave(nested_vmcb, svm->vmcb);
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nested_svm_unmap(page);
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return 1;
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return ret;
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}
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static int vmsave_interception(struct vcpu_svm *svm)
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{
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struct vmcb *nested_vmcb;
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struct page *page;
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int ret;
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if (nested_svm_check_permissions(svm))
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return 1;
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@ -3085,12 +3093,12 @@ static int vmsave_interception(struct vcpu_svm *svm)
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return 1;
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svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
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skip_emulated_instruction(&svm->vcpu);
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ret = kvm_skip_emulated_instruction(&svm->vcpu);
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nested_svm_vmloadsave(svm->vmcb, nested_vmcb);
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nested_svm_unmap(page);
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return 1;
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return ret;
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}
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static int vmrun_interception(struct vcpu_svm *svm)
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@ -3123,25 +3131,29 @@ static int vmrun_interception(struct vcpu_svm *svm)
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static int stgi_interception(struct vcpu_svm *svm)
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{
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int ret;
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if (nested_svm_check_permissions(svm))
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return 1;
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svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
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skip_emulated_instruction(&svm->vcpu);
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ret = kvm_skip_emulated_instruction(&svm->vcpu);
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kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);
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enable_gif(svm);
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return 1;
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return ret;
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}
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static int clgi_interception(struct vcpu_svm *svm)
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{
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int ret;
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if (nested_svm_check_permissions(svm))
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return 1;
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svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
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skip_emulated_instruction(&svm->vcpu);
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ret = kvm_skip_emulated_instruction(&svm->vcpu);
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disable_gif(svm);
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@ -3152,7 +3164,7 @@ static int clgi_interception(struct vcpu_svm *svm)
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mark_dirty(svm->vmcb, VMCB_INTR);
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}
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return 1;
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return ret;
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}
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static int invlpga_interception(struct vcpu_svm *svm)
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@ -3166,8 +3178,7 @@ static int invlpga_interception(struct vcpu_svm *svm)
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kvm_mmu_invlpg(vcpu, kvm_register_read(&svm->vcpu, VCPU_REGS_RAX));
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svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
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skip_emulated_instruction(&svm->vcpu);
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return 1;
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return kvm_skip_emulated_instruction(&svm->vcpu);
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}
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static int skinit_interception(struct vcpu_svm *svm)
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@ -3190,7 +3201,7 @@ static int xsetbv_interception(struct vcpu_svm *svm)
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if (kvm_set_xcr(&svm->vcpu, index, new_bv) == 0) {
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svm->next_rip = kvm_rip_read(&svm->vcpu) + 3;
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skip_emulated_instruction(&svm->vcpu);
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return kvm_skip_emulated_instruction(&svm->vcpu);
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}
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return 1;
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@ -3286,8 +3297,7 @@ static int invlpg_interception(struct vcpu_svm *svm)
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return emulate_instruction(&svm->vcpu, 0) == EMULATE_DONE;
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kvm_mmu_invlpg(&svm->vcpu, svm->vmcb->control.exit_info_1);
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skip_emulated_instruction(&svm->vcpu);
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return 1;
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return kvm_skip_emulated_instruction(&svm->vcpu);
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}
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static int emulate_on_interception(struct vcpu_svm *svm)
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@ -3437,9 +3447,7 @@ static int dr_interception(struct vcpu_svm *svm)
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kvm_register_write(&svm->vcpu, reg, val);
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}
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skip_emulated_instruction(&svm->vcpu);
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return 1;
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return kvm_skip_emulated_instruction(&svm->vcpu);
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}
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static int cr8_write_interception(struct vcpu_svm *svm)
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@ -3562,6 +3570,7 @@ static int rdmsr_interception(struct vcpu_svm *svm)
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if (svm_get_msr(&svm->vcpu, &msr_info)) {
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trace_kvm_msr_read_ex(ecx);
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kvm_inject_gp(&svm->vcpu, 0);
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return 1;
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} else {
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trace_kvm_msr_read(ecx, msr_info.data);
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@ -3570,9 +3579,8 @@ static int rdmsr_interception(struct vcpu_svm *svm)
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kvm_register_write(&svm->vcpu, VCPU_REGS_RDX,
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msr_info.data >> 32);
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svm->next_rip = kvm_rip_read(&svm->vcpu) + 2;
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skip_emulated_instruction(&svm->vcpu);
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return kvm_skip_emulated_instruction(&svm->vcpu);
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}
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return 1;
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}
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static int svm_set_vm_cr(struct kvm_vcpu *vcpu, u64 data)
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@ -3698,11 +3706,11 @@ static int wrmsr_interception(struct vcpu_svm *svm)
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if (kvm_set_msr(&svm->vcpu, &msr)) {
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trace_kvm_msr_write_ex(ecx, data);
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kvm_inject_gp(&svm->vcpu, 0);
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return 1;
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} else {
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trace_kvm_msr_write(ecx, data);
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skip_emulated_instruction(&svm->vcpu);
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return kvm_skip_emulated_instruction(&svm->vcpu);
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}
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return 1;
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}
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static int msr_interception(struct vcpu_svm *svm)
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@ -3731,8 +3739,7 @@ static int pause_interception(struct vcpu_svm *svm)
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static int nop_interception(struct vcpu_svm *svm)
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{
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skip_emulated_instruction(&(svm->vcpu));
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return 1;
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return kvm_skip_emulated_instruction(&(svm->vcpu));
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}
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static int monitor_interception(struct vcpu_svm *svm)
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