linux.git/tools/testing/selftests/kvm/include/loongarch, branch master Linux kernel source tree KVM: selftests: Use u64 instead of uint64_t 2026-04-20T21:54:16+00:00 David Matlack dmatlack@google.com 2026-04-20T21:19:49+00:00 26f8453288d4c1fb8c96802eae15ddc988f5e068 Use u64 instead of uint64_t to make the KVM selftests code more concise and more similar to the kernel (since selftests are primarily developed by kernel developers). This commit was generated with the following command: git ls-files tools/testing/selftests/kvm | xargs sed -i 's/uint64_t/u64/g' Then by manually adjusting whitespace to make checkpatch.pl happy. Include <linux/types.h> in include/kvm_util_types.h, iinclude/test_util.h, and include/x86/pmu.h to pick up the tools-defined u64. Arguably, all headers (especially kvm_util_types.h) should have already been including stdint.h to get uint64_t from the libc headers, but the missing dependency only rears its head once KVM uses u64 instead of uint64_t. No functional change intended. Signed-off-by: David Matlack <dmatlack@google.com> [sean: rename pread_uint64() => pread_u64, expand on types.h include] Link: https://patch.msgid.link/20260420212004.3938325-5-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com> 
Use u64 instead of uint64_t to make the KVM selftests code more concise
and more similar to the kernel (since selftests are primarily developed
by kernel developers).

This commit was generated with the following command:

  git ls-files tools/testing/selftests/kvm | xargs sed -i 's/uint64_t/u64/g'

Then by manually adjusting whitespace to make checkpatch.pl happy.

Include <linux/types.h> in include/kvm_util_types.h, iinclude/test_util.h,
and include/x86/pmu.h to pick up the tools-defined u64.  Arguably, all
headers (especially kvm_util_types.h) should have already been including
stdint.h to get uint64_t from the libc headers, but the missing dependency
only rears its head once KVM uses u64 instead of uint64_t.

No functional change intended.

Signed-off-by: David Matlack <dmatlack@google.com>
[sean: rename pread_uint64() => pread_u64, expand on types.h include]
Link: https://patch.msgid.link/20260420212004.3938325-5-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
KVM: selftests: Use gva_t instead of vm_vaddr_t 2026-04-20T21:54:16+00:00 David Matlack dmatlack@google.com 2026-04-20T21:19:46+00:00 5567fc9dcd7ed46678cd68e6ca0662331d42f0ac Replace all occurrences of vm_vaddr_t with gva_t to align with KVM code and with the conversion helpers (e.g. addr_gva2hva()). This commit was generated with the following command: git ls-files tools/testing/selftests/kvm | xargs sed -i 's/vm_vaddr_/gva_/g' Then by manually adjusting whitespace to make checkpatch.pl happy, and dropping renames of functions that allocate memory within a given VM. No functional change intended. Signed-off-by: David Matlack <dmatlack@google.com> [sean: drop renames of allocator APIs] Link: https://patch.msgid.link/20260420212004.3938325-2-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com> 
Replace all occurrences of vm_vaddr_t with gva_t to align with KVM code
and with the conversion helpers (e.g. addr_gva2hva()).

This commit was generated with the following command:

  git ls-files tools/testing/selftests/kvm | xargs sed -i 's/vm_vaddr_/gva_/g'

Then by manually adjusting whitespace to make checkpatch.pl happy, and
dropping renames of functions that allocate memory within a given VM.

No functional change intended.

Signed-off-by: David Matlack <dmatlack@google.com>
[sean: drop renames of allocator APIs]
Link: https://patch.msgid.link/20260420212004.3938325-2-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
KVM: LoongArch: selftests: Add PMU overflow interrupt test 2026-04-09T10:56:38+00:00 Song Gao gaosong@loongson.cn 2026-04-09T10:56:38+00:00 e47b8e1db9a9bbef6765e85b11e87f48e6b56846 Extend the PMU test suite to cover overflow interrupts. The test enables the PMI (Performance Monitor Interrupt), sets counter 0 to one less than the overflow value, and verifies that an interrupt is raised when the counter overflows. A guest interrupt handler checks the interrupt cause and disables further PMU interrupts upon success. Signed-off-by: Song Gao <gaosong@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 
Extend the PMU test suite to cover overflow interrupts. The test enables
the PMI (Performance Monitor Interrupt), sets counter 0 to one less than
the overflow value, and verifies that an interrupt is raised when the
counter overflows. A guest interrupt handler checks the interrupt cause
and disables further PMU interrupts upon success.

Signed-off-by: Song Gao <gaosong@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
KVM: LoongArch: selftests: Add basic PMU event counting test 2026-04-09T10:56:37+00:00 Song Gao gaosong@loongson.cn 2026-04-09T10:56:37+00:00 11c840192768a5a63b6aed75273c5e8e416230ee Introduce a basic PMU test that verifies hardware event counting for four performance counters. The test enables the events for CPU cycles, instructions retired, branch instructions, and branch misses, runs a fixed number of loops, and checks that the counter values fall within expected ranges. It also validates that the host supports PMU and that the VM feature is enabled. Signed-off-by: Song Gao <gaosong@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 
Introduce a basic PMU test that verifies hardware event counting for
four performance counters. The test enables the events for CPU cycles,
instructions retired, branch instructions, and branch misses, runs a
fixed number of loops, and checks that the counter values fall within
expected ranges. It also validates that the host supports PMU and that
the VM feature is enabled.

Signed-off-by: Song Gao <gaosong@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
KVM: LoongArch: selftests: Add cpucfg read/write helpers 2026-04-09T10:56:37+00:00 Song Gao gaosong@loongson.cn 2026-04-09T10:56:37+00:00 fa19ea9a7bdb97575e05d72305a4c40a3a631357 Add helper macros and functions to read and write CPU configuration registers (cpucfg) from the guest and from the VMM. This interface is required in upcoming selftests for querying and setting CPU features, such as PMU capabilities. Signed-off-by: Song Gao <gaosong@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 
Add helper macros and functions to read and write CPU configuration
registers (cpucfg) from the guest and from the VMM. This interface is
required in upcoming selftests for querying and setting CPU features,
such as PMU capabilities.

Signed-off-by: Song Gao <gaosong@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
KVM: selftests: Add a "struct kvm_mmu_arch arch" member to kvm_mmu 2026-01-08T20:02:09+00:00 Sean Christopherson seanjc@google.com 2025-12-30T23:01:37+00:00 3d0e7595e81017558189d2252ae9453c57ab3436 Add an arch structure+field in "struct kvm_mmu" so that architectures can track arch-specific information for a given MMU. No functional change intended. Reviewed-by: Yosry Ahmed <yosry.ahmed@linux.dev> Link: https://patch.msgid.link/20251230230150.4150236-9-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com> 
Add an arch structure+field in "struct kvm_mmu" so that architectures can
track arch-specific information for a given MMU.

No functional change intended.

Reviewed-by: Yosry Ahmed <yosry.ahmed@linux.dev>
Link: https://patch.msgid.link/20251230230150.4150236-9-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
KVM: LoongArch: selftests: Add timer interrupt test case 2025-11-28T06:49:44+00:00 Bibo Mao maobibo@loongson.cn 2025-11-28T06:49:44+00:00 df41742343fad11fde06e085096003d64599785f Add timer test case based on common arch_timer code, timer interrupt with one-shot and period mode is tested. Signed-off-by: Bibo Mao <maobibo@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 
Add timer test case based on common arch_timer code, timer interrupt
with one-shot and period mode is tested.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
KVM: LoongArch: selftests: Add exception handler register interface 2025-11-27T03:00:18+00:00 Bibo Mao maobibo@loongson.cn 2025-11-27T03:00:18+00:00 d84fe2f30b0a0cbe08260c00a84ffe42161c95ce Add interrupt and exception handler register interface. When exception happens, execute registered exception handler if exists, else report an error. Signed-off-by: Bibo Mao <maobibo@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 
Add interrupt and exception handler register interface. When exception
happens, execute registered exception handler if exists, else report an
error.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
KVM: LoongArch: selftests: Add basic interfaces 2025-11-27T03:00:18+00:00 Bibo Mao maobibo@loongson.cn 2025-11-27T03:00:18+00:00 1c5d3a1eab32db1ebb0d5d30736e9236e8a7014f Add some basic function interfaces such as CSR register access, local irq enable or disable APIs. Signed-off-by: Bibo Mao <maobibo@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 
Add some basic function interfaces such as CSR register access, local
irq enable or disable APIs.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
KVM: LoongArch: selftests: Add system registers save/restore on exception 2025-11-27T03:00:18+00:00 Bibo Mao maobibo@loongson.cn 2025-11-27T03:00:18+00:00 985a96983bedf04fa61315e68806f3468450c8a1 When system returns from exception with ertn instruction, PC comes from LOONGARCH_CSR_ERA, and CSR.CRMD comes LOONGARCH_CSR_PRMD. Here save CSR register CSR.ERA and CSR.PRMD into stack, and then restore them from stack. So it can be modified by exception handlers in future. Signed-off-by: Bibo Mao <maobibo@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn> 
When system returns from exception with ertn instruction, PC comes from
LOONGARCH_CSR_ERA, and CSR.CRMD comes LOONGARCH_CSR_PRMD.

Here save CSR register CSR.ERA and CSR.PRMD into stack, and then restore
them from stack. So it can be modified by exception handlers in future.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>