diff mbox series

[RFC,kvmtool,24/31] arm64: Don't try to debug a realm

Message ID 20230127113932.166089-25-suzuki.poulose@arm.com (mailing list archive)
State New, archived
Headers show
Series [RFC,kvmtool,01/31] arm64: Disable MTE when CFI flash is emulated | expand

Commit Message

Suzuki K Poulose Jan. 27, 2023, 11:39 a.m. UTC 
From: Alexandru Elisei <alexandru.elisei@arm.com>

Don't read the register values for a running realm, because they don't
reflect the actual hardware state of a realm. And don't try to read realm
memory, because that will promptly lead to kvmtool being killed.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
---
 arm/aarch64/kvm-cpu.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/arm/aarch64/kvm-cpu.c b/arm/aarch64/kvm-cpu.c
index 32fa7609..a29a3413 100644
--- a/arm/aarch64/kvm-cpu.c
+++ b/arm/aarch64/kvm-cpu.c
@@ -250,6 +250,9 @@  void kvm_cpu__show_code(struct kvm_cpu *vcpu)
 
 	reg.addr = (u64)&data;
 
+	if (vcpu->kvm->cfg.arch.is_realm)
+		return;
+
 	dprintf(debug_fd, "\n*pc:\n");
 	reg.id = ARM64_CORE_REG(regs.pc);
 	if (ioctl(vcpu->vcpu_fd, KVM_GET_ONE_REG, &reg) < 0)
@@ -274,6 +277,11 @@  void kvm_cpu__show_registers(struct kvm_cpu *vcpu)
 	reg.addr = (u64)&data;
 	dprintf(debug_fd, "\n Registers:\n");
 
+	if (vcpu->kvm->cfg.arch.is_realm) {
+		dprintf(debug_fd, " UNACCESSIBLE\n");
+		return;
+	}
+
 	reg.id		= ARM64_CORE_REG(regs.pc);
 	if (ioctl(vcpu->vcpu_fd, KVM_GET_ONE_REG, &reg) < 0)
 		die("KVM_GET_ONE_REG failed (pc)");