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| author | Bojan Novković <bojan.novkovic@fer.hr> | 2023-12-07 22:46:31 +0000 |
|---|---|---|
| committer | John Baldwin <jhb@FreeBSD.org> | 2023-12-07 23:10:56 +0000 |
| commit | 231eee17d2905682014b71d1f01719003b13bd91 (patch) | |
| tree | e1bba93d059bae23c0c482f6c4202ac8c9bbf3dc | |
| parent | 78c1d174a1e13c6522bd4d663225fc9cbabc329d (diff) | |
| download | src-231eee17d2905682014b71d1f01719003b13bd91.tar.gz src-231eee17d2905682014b71d1f01719003b13bd91.zip | |
vmm: enable software breakpoints for AMD CPUs
This patch adds support for software breakpoint vmexits on AMD SVM.
It implements the VM_CAP_BPT_EXIT used to enable software breakpoints.
When enabled, breakpoint vmexits are passed to userspace where they
are handled by the GDB stub.
Reviewed by: jhb
Sponsored by: Google, Inc. (GSoC 2022)
Differential Revision: https://reviews.freebsd.org/D42295
| -rw-r--r-- | sys/amd64/vmm/amd/svm.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/sys/amd64/vmm/amd/svm.c b/sys/amd64/vmm/amd/svm.c index a502632f6ed6..ec0cde31aaad 100644 --- a/sys/amd64/vmm/amd/svm.c +++ b/sys/amd64/vmm/amd/svm.c @@ -1421,6 +1421,12 @@ svm_vmexit(struct svm_softc *svm_sc, struct svm_vcpu *vcpu, break; case IDT_BP: + vmexit->exitcode = VM_EXITCODE_BPT; + vmexit->u.bpt.inst_length = vmexit->inst_length; + vmexit->inst_length = 0; + + reflect = 0; + break; case IDT_OF: case IDT_BR: /* @@ -2333,6 +2339,9 @@ svm_setcap(void *vcpui, int type, int val) if (val == 0) error = EINVAL; break; + case VM_CAP_BPT_EXIT: + svm_set_intercept(vcpu, VMCB_EXC_INTCPT, BIT(IDT_BP), val); + break; case VM_CAP_IPI_EXIT: vlapic = vm_lapic(vcpu->vcpu); vlapic->ipi_exit = val; @@ -2366,6 +2375,9 @@ svm_getcap(void *vcpui, int type, int *retval) case VM_CAP_UNRESTRICTED_GUEST: *retval = 1; /* unrestricted guest is always enabled */ break; + case VM_CAP_BPT_EXIT: + *retval = svm_get_intercept(vcpu, VMCB_EXC_INTCPT, BIT(IDT_BP)); + break; case VM_CAP_IPI_EXIT: vlapic = vm_lapic(vcpu->vcpu); *retval = vlapic->ipi_exit; |