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Sun, 15 Feb 2026 19:45:00 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [RFC PATCH 11/13] target/arm: Add have_ffr argument to kvm_arch_{get, put}_sve Date: Mon, 16 Feb 2026 13:44:30 +1000 Message-ID: <20260216034432.23912-12-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260216034432.23912-1-richard.henderson@linaro.org> References: <20260216034432.23912-1-richard.henderson@linaro.org> MIME-Version: 1.0 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=2607:f8b0:4864:20::630; envelope-from=richard.henderson@linaro.org; helo=mail-pl1-x630.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: fail (Header signature does not verify) X-ZM-MESSAGEID: 1771213523684158500 Content-Type: text/plain; charset="utf-8" Signed-off-by: Richard Henderson Reviewed-by: Peter Maydell --- target/arm/kvm.c | 32 ++++++++++++++++++-------------- 1 file changed, 18 insertions(+), 14 deletions(-) diff --git a/target/arm/kvm.c b/target/arm/kvm.c index f6bab562a0..d05ad1d7e1 100644 --- a/target/arm/kvm.c +++ b/target/arm/kvm.c @@ -2122,7 +2122,7 @@ static int kvm_arch_put_fpsimd(CPUState *cs) * code the slice index to zero for now as it's unlikely we'll need more t= han * one slice for quite some time. */ -static int kvm_arch_put_sve(CPUState *cs, uint32_t vq) +static int kvm_arch_put_sve(CPUState *cs, uint32_t vq, bool have_ffr) { CPUARMState *env =3D cpu_env(cs); uint64_t tmp[ARM_MAX_VQ * 2]; @@ -2145,11 +2145,13 @@ static int kvm_arch_put_sve(CPUState *cs, uint32_t = vq) } } =20 - r =3D sve_bswap64(tmp, &env->vfp.pregs[FFR_PRED_NUM].p[0], - DIV_ROUND_UP(vq * 2, 8)); - ret =3D kvm_set_one_reg(cs, KVM_REG_ARM64_SVE_FFR(0), r); - if (ret) { - return ret; + if (have_ffr) { + r =3D sve_bswap64(tmp, &env->vfp.pregs[FFR_PRED_NUM].p[0], + DIV_ROUND_UP(vq * 2, 8)); + ret =3D kvm_set_one_reg(cs, KVM_REG_ARM64_SVE_FFR(0), r); + if (ret) { + return ret; + } } =20 return 0; @@ -2238,7 +2240,7 @@ int kvm_arch_put_registers(CPUState *cs, KvmPutState = level, Error **errp) } =20 if (cpu_isar_feature(aa64_sve, cpu)) { - ret =3D kvm_arch_put_sve(cs, cpu->sve_max_vq); + ret =3D kvm_arch_put_sve(cs, cpu->sve_max_vq, true); } else { ret =3D kvm_arch_put_fpsimd(cs); } @@ -2304,7 +2306,7 @@ static int kvm_arch_get_fpsimd(CPUState *cs) * code the slice index to zero for now as it's unlikely we'll need more t= han * one slice for quite some time. */ -static int kvm_arch_get_sve(CPUState *cs, uint32_t vq) +static int kvm_arch_get_sve(CPUState *cs, uint32_t vq, bool have_ffr) { CPUARMState *env =3D cpu_env(cs); uint64_t *r; @@ -2328,12 +2330,14 @@ static int kvm_arch_get_sve(CPUState *cs, uint32_t = vq) sve_bswap64(r, r, DIV_ROUND_UP(vq * 2, 8)); } =20 - r =3D &env->vfp.pregs[FFR_PRED_NUM].p[0]; - ret =3D kvm_get_one_reg(cs, KVM_REG_ARM64_SVE_FFR(0), r); - if (ret) { - return ret; + if (have_ffr) { + r =3D &env->vfp.pregs[FFR_PRED_NUM].p[0]; + ret =3D kvm_get_one_reg(cs, KVM_REG_ARM64_SVE_FFR(0), r); + if (ret) { + return ret; + } + sve_bswap64(r, r, DIV_ROUND_UP(vq * 2, 8)); } - sve_bswap64(r, r, DIV_ROUND_UP(vq * 2, 8)); =20 return 0; } @@ -2421,7 +2425,7 @@ int kvm_arch_get_registers(CPUState *cs, Error **errp) } =20 if (cpu_isar_feature(aa64_sve, cpu)) { - ret =3D kvm_arch_get_sve(cs, cpu->sve_max_vq); + ret =3D kvm_arch_get_sve(cs, cpu->sve_max_vq, true); } else { ret =3D kvm_arch_get_fpsimd(cs); } --=20 2.43.0