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Tue, 24 Feb 2026 04:10:20 -0800 (PST) From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: qemu-devel@nongnu.org Cc: Peter Maydell , qemu-arm@nongnu.org, =?UTF-8?q?Alex=20Benn=C3=A9e?= , eca Subject: [PATCH 6/8] tests/tcg/aarch64: Add WFX instructions system test Date: Tue, 24 Feb 2026 12:10:12 +0000 Message-ID: <20260224121014.279248-7-alex.bennee@linaro.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260224121014.279248-1-alex.bennee@linaro.org> References: <20260224121014.279248-1-alex.bennee@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::534; envelope-from=alex.bennee@linaro.org; helo=mail-ed1-x534.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1771935082252158500 This commit adds a new system-mode TCG test to verify the behavior of WFI, WFE, WFIT, and WFET instructions on AArch64. The test ensures: - WFI correctly wakes on a timer interrupt. - WFE returns immediately if the event register is set (via SEV). - WFIT and WFET correctly sleep until the specified timeout. =F0=9F=A4=96 Generated with [eca](https://eca.dev) Co-Authored-By: eca --- ajb: - removed an excess setting of QEMU_OPTS in the Makefile --- tests/tcg/aarch64/system/wfx.c | 113 ++++++++++++++++++++++ tests/tcg/aarch64/Makefile.softmmu-target | 2 + 2 files changed, 115 insertions(+) create mode 100644 tests/tcg/aarch64/system/wfx.c diff --git a/tests/tcg/aarch64/system/wfx.c b/tests/tcg/aarch64/system/wfx.c new file mode 100644 index 00000000000..59436c381fd --- /dev/null +++ b/tests/tcg/aarch64/system/wfx.c @@ -0,0 +1,113 @@ +/* + * WFX Instructions Test (WFI, WFE, WFIT, WFET) + * + * Copyright (c) 2024 Linaro Ltd + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include +#include + +#define __stringify_1(x...) #x +#define __stringify(x...) __stringify_1(x) + +#define read_sysreg(r) ({ \ + uint64_t __val; \ + asm volatile("mrs %0, " __stringify(r) : "=3Dr" (__val)); \ + __val; \ +}) + +#define write_sysreg(r, v) do { \ + uint64_t __val =3D (uint64_t)(v); \ + asm volatile("msr " __stringify(r) ", %x0" \ + : : "rZ" (__val)); \ +} while (0) + +#define isb() asm volatile("isb" : : : "memory") +#define sev() asm volatile("sev" : : : "memory") +#define wfi() asm volatile("wfi" : : : "memory") +#define wfe() asm volatile("wfe" : : : "memory") +#define wfit(reg) asm volatile("wfit %0" : : "r" (reg) : "memory") +#define wfet(reg) asm volatile("wfet %0" : : "r" (reg) : "memory") + +static void wait_ticks(uint64_t ticks) +{ + uint64_t start =3D read_sysreg(cntvct_el0); + while ((read_sysreg(cntvct_el0) - start) < ticks) { + /* spin */ + } +} + +int main(void) +{ + uint64_t start, end, elapsed; + uint64_t timeout; + + ml_printf("WFX Test\n"); + + /* 1. Test WFI with timer interrupt */ + ml_printf("Testing WFI..."); + /* Setup virtual timer to fire in 100000 ticks (~2ms at 50MHz) */ + start =3D read_sysreg(cntvct_el0); + write_sysreg(cntv_tval_el0, 100000); + write_sysreg(cntv_ctl_el0, 1); /* Enable timer, no mask */ + isb(); + + /* + * We don't have a full interrupt handler, but WFI should wake up + * when the interrupt is pending even if we have it masked at the CPU. + * PSTATE.I is set by boot code. + */ + wfi(); + end =3D read_sysreg(cntvct_el0); + elapsed =3D end - start; + if (elapsed < 100000) { + ml_printf("FAILED: WFI woke too early (%ld ticks)\n", elapsed); + return 1; + } + ml_printf("PASSED (elapsed %ld ticks)\n", elapsed); + write_sysreg(cntv_ctl_el0, 0); /* Disable timer */ + + /* 2. Test WFE and SEV */ + ml_printf("Testing WFE/SEV..."); + sev(); /* Set event register */ + start =3D read_sysreg(cntvct_el0); + wfe(); /* Should return immediately */ + end =3D read_sysreg(cntvct_el0); + elapsed =3D end - start; + if (elapsed > 1000) { /* Should be very fast */ + ml_printf("FAILED: WFE slept despite SEV (%ld ticks)\n", elapsed); + return 1; + } + ml_printf("PASSED\n"); + + /* 3. Test WFIT */ + ml_printf("Testing WFIT..."); + start =3D read_sysreg(cntvct_el0); + timeout =3D start + 200000; + wfit(timeout); + end =3D read_sysreg(cntvct_el0); + elapsed =3D end - start; + if (elapsed < 200000) { + ml_printf("FAILED: WFIT woke too early (%ld ticks)\n", elapsed); + return 1; + } + ml_printf("PASSED (elapsed %ld ticks)\n", elapsed); + + /* 4. Test WFET */ + ml_printf("Testing WFET..."); + start =3D read_sysreg(cntvct_el0); + timeout =3D start + 200000; + wfet(timeout); + end =3D read_sysreg(cntvct_el0); + elapsed =3D end - start; + if (elapsed < 200000) { + ml_printf("FAILED: WFET woke too early (%ld ticks)\n", elapsed); + return 1; + } + ml_printf("PASSED (elapsed %ld ticks)\n", elapsed); + + ml_printf("ALL WFX TESTS PASSED\n"); + return 0; +} diff --git a/tests/tcg/aarch64/Makefile.softmmu-target b/tests/tcg/aarch64/= Makefile.softmmu-target index f7a7d2b800f..84342c52cd7 100644 --- a/tests/tcg/aarch64/Makefile.softmmu-target +++ b/tests/tcg/aarch64/Makefile.softmmu-target @@ -102,6 +102,8 @@ run-pauth-3: $(call skip-test, "RUN of pauth-3", "not built") endif =20 +wfx: CFLAGS +=3D -march=3Darmv8.7-a + ifneq ($(CROSS_CC_HAS_ARMV8_MTE),) QEMU_MTE_ENABLED_MACHINE=3D-M virt,mte=3Don -cpu max -display none QEMU_OPTS_WITH_MTE_ON =3D $(QEMU_MTE_ENABLED_MACHINE) $(QEMU_BASE_ARGS) -k= ernel --=20 2.47.3