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Thu, 26 Feb 2026 07:55:55 -0800 (PST) From: Peter Maydell To: qemu-devel@nongnu.org Subject: [PULL 18/20] target/arm: Add have_ffr argument to kvm_arch_{get, put}_sve Date: Thu, 26 Feb 2026 15:55:33 +0000 Message-ID: <20260226155535.1171290-19-peter.maydell@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260226155535.1171290-1-peter.maydell@linaro.org> References: <20260226155535.1171290-1-peter.maydell@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=2a00:1450:4864:20::32d; envelope-from=peter.maydell@linaro.org; helo=mail-wm1-x32d.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: 1772121484344158500 Content-Type: text/plain; charset="utf-8" From: Richard Henderson Signed-off-by: Richard Henderson Reviewed-by: Peter Maydell Message-id: 20260216034432.23912-12-richard.henderson@linaro.org Signed-off-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 ecb732a669..4908138764 100644 --- a/target/arm/kvm.c +++ b/target/arm/kvm.c @@ -2118,7 +2118,7 @@ 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]; @@ -2141,11 +2141,13 @@ 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; @@ -2234,7 +2236,7 @@ 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); } @@ -2300,7 +2302,7 @@ 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; @@ -2324,12 +2326,14 @@ 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; } @@ -2417,7 +2421,7 @@ 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