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Wed, 16 Jul 2025 09:59:35 -0700 (PDT) From: Yury Norov To: Tianrui Zhao , Bibo Mao , Huacai Chen , WANG Xuerui , kvm@vger.kernel.org, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Cc: Yury Norov Subject: [PATCH 1/2] LoongArch: KVM: rework kvm_send_pv_ipi() Date: Wed, 16 Jul 2025 12:59:26 -0400 Message-ID: <20250716165929.22386-2-yury.norov@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250716165929.22386-1-yury.norov@gmail.com> References: <20250716165929.22386-1-yury.norov@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: "Yury Norov (NVIDIA)" The function in fact traverses a "bitmap" stored in GPR regs A1 and A2, but does it in a non-obvious way by creating a single-word bitmap twice. This patch switches the function to create a single 2-word bitmap, and also employs for_each_set_bit() macro, as it helps to drop most of housekeeping code. While there, convert the function to return void to not confuse readers with unchecked result. Signed-off-by: Yury Norov (NVIDIA) Reviewed-by: Bibo Mao --- arch/loongarch/kvm/exit.c | 31 ++++++++++++------------------- 1 file changed, 12 insertions(+), 19 deletions(-) diff --git a/arch/loongarch/kvm/exit.c b/arch/loongarch/kvm/exit.c index fa52251b3bf1..359afa909cee 100644 --- a/arch/loongarch/kvm/exit.c +++ b/arch/loongarch/kvm/exit.c @@ -821,32 +821,25 @@ static int kvm_handle_lbt_disabled(struct kvm_vcpu *v= cpu, int ecode) return RESUME_GUEST; } =20 -static int kvm_send_pv_ipi(struct kvm_vcpu *vcpu) +static void kvm_send_pv_ipi(struct kvm_vcpu *vcpu) { - unsigned int min, cpu, i; - unsigned long ipi_bitmap; + DECLARE_BITMAP(ipi_bitmap, BITS_PER_LONG * 2) =3D { + kvm_read_reg(vcpu, LOONGARCH_GPR_A1), + kvm_read_reg(vcpu, LOONGARCH_GPR_A2) + }; + unsigned int min, cpu; struct kvm_vcpu *dest; =20 min =3D kvm_read_reg(vcpu, LOONGARCH_GPR_A3); - for (i =3D 0; i < 2; i++, min +=3D BITS_PER_LONG) { - ipi_bitmap =3D kvm_read_reg(vcpu, LOONGARCH_GPR_A1 + i); - if (!ipi_bitmap) + for_each_set_bit(cpu, ipi_bitmap, BITS_PER_LONG * 2) { + dest =3D kvm_get_vcpu_by_cpuid(vcpu->kvm, cpu + min); 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Wed, 16 Jul 2025 09:59:38 -0700 (PDT) Received: from localhost ([216.228.127.129]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-23de4359ddcsm126901705ad.207.2025.07.16.09.59.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Jul 2025 09:59:38 -0700 (PDT) From: Yury Norov To: Tianrui Zhao , Bibo Mao , Huacai Chen , WANG Xuerui , kvm@vger.kernel.org, loongarch@lists.linux.dev, linux-kernel@vger.kernel.org Cc: Yury Norov Subject: [PATCH 2/2] LoongArch: KVM:: simplify kvm_deliver_intr() Date: Wed, 16 Jul 2025 12:59:27 -0400 Message-ID: <20250716165929.22386-3-yury.norov@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250716165929.22386-1-yury.norov@gmail.com> References: <20250716165929.22386-1-yury.norov@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: "Yury Norov (NVIDIA)" The function opencodes for_each_set_bit() macro, which makes it bulky. Using the proper API makes all the housekeeping code going away. Signed-off-by: Yury Norov (NVIDIA) Reviewed-by: Bibo Mao --- arch/loongarch/kvm/interrupt.c | 25 ++++--------------------- 1 file changed, 4 insertions(+), 21 deletions(-) diff --git a/arch/loongarch/kvm/interrupt.c b/arch/loongarch/kvm/interrupt.c index 4c3f22de4b40..8462083f0301 100644 --- a/arch/loongarch/kvm/interrupt.c +++ b/arch/loongarch/kvm/interrupt.c @@ -83,28 +83,11 @@ void kvm_deliver_intr(struct kvm_vcpu *vcpu) unsigned long *pending =3D &vcpu->arch.irq_pending; unsigned long *pending_clr =3D &vcpu->arch.irq_clear; =20 - if (!(*pending) && !(*pending_clr)) - return; - - if (*pending_clr) { - priority =3D __ffs(*pending_clr); - while (priority <=3D INT_IPI) { - kvm_irq_clear(vcpu, priority); - priority =3D find_next_bit(pending_clr, - BITS_PER_BYTE * sizeof(*pending_clr), - priority + 1); - } - } + for_each_set_bit(priority, pending_clr, INT_IPI + 1) + kvm_irq_clear(vcpu, priority); =20 - if (*pending) { - priority =3D __ffs(*pending); - while (priority <=3D INT_IPI) { - kvm_irq_deliver(vcpu, priority); - priority =3D find_next_bit(pending, - BITS_PER_BYTE * sizeof(*pending), - priority + 1); - } - } + for_each_set_bit(priority, pending, INT_IPI + 1) + kvm_irq_deliver(vcpu, priority); } =20 int kvm_pending_timer(struct kvm_vcpu *vcpu) --=20 2.43.0