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KVM: selftests: riscv: Improve unexpected guest trap handling

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Currently, we simply hang using "while (1) ;" upon any unexpected
guest traps because the default guest trap handler is guest_hang().

The above approach is not useful to anyone because KVM selftests
users will only see a hung application upon any unexpected guest
trap.

This patch improves unexpected guest trap handling for KVM RISC-V
selftests by doing the following:
1) Return to host user-space
2) Dump VCPU registers
3) Die using TEST_ASSERT(0, ...)

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Tested-by: Mayuresh Chitale <mchitale@ventanamicro.com>
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Anup Patel
2022-04-09 10:02:36 +05:30
committed by Anup Patel
parent 42226c9897
commit ac6c85e962
3 changed files with 30 additions and 16 deletions
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8
tools/testing/selftests/kvm/include/riscv/processor.h
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@@ -119,10 +119,12 @@ static inline void set_reg(struct kvm_vm *vm, uint32_t vcpuid, uint64_t id,
#define SATP_ASID_SHIFT 44
#define SATP_ASID_MASK _AC(0xFFFF, UL)
#define SBI_EXT_EXPERIMENTAL_START 0x08000000
#define SBI_EXT_EXPERIMENTAL_END 0x08FFFFFF
#define SBI_EXT_EXPERIMENTAL_START 0x08000000
#define SBI_EXT_EXPERIMENTAL_END 0x08FFFFFF
#define KVM_RISCV_SELFTESTS_SBI_EXT SBI_EXT_EXPERIMENTAL_END
#define KVM_RISCV_SELFTESTS_SBI_EXT SBI_EXT_EXPERIMENTAL_END
#define KVM_RISCV_SELFTESTS_SBI_UCALL 0
#define KVM_RISCV_SELFTESTS_SBI_UNEXP 1
struct sbiret {
long error;