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Sat, 2 Feb 2019 01:43:26 +0000 From: Paul Burton To: "linux-mips@vger.kernel.org" CC: Paul Burton Subject: [PATCH 11/14] MIPS: mm: Unify ASID version checks Thread-Topic: [PATCH 11/14] MIPS: mm: Unify ASID version checks Thread-Index: AQHUupivZZWNvn16E0eR7VwgBTrhdg== Date: Sat, 2 Feb 2019 01:43:25 +0000 Message-ID: <20190202014242.30680-12-paul.burton@mips.com> References: <20190202014242.30680-1-paul.burton@mips.com> In-Reply-To: <20190202014242.30680-1-paul.burton@mips.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-clientproxiedby: BYAPR01CA0021.prod.exchangelabs.com (2603:10b6:a02:80::34) To MWHPR2201MB1277.namprd22.prod.outlook.com (2603:10b6:301:24::17) authentication-results: spf=none (sender IP is ) smtp.mailfrom=pburton@wavecomp.com; x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: git-send-email 2.20.1 x-originating-ip: [67.207.99.198] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;MWHPR2201MB1439;6:1IfP8XZcfCrMiqL+WkkyYz3++pRaLyUOKjC74ViaeKJvdBRSN6WVIzp1AXkU45tK/YxXOsDzWS0AKDmTgnseN1mVxIMrXjiTzR4p7RBeaYkJzoJs/0FQbp4W2nDNxKt1z4w4K5np/nhfTMv0u+zKgAHEGF0qTpbaxJBvgbEn7VwKAHwazmOooO/1CINIgl4qAIN5rzVkZkAZW2MH7yQpg6sQ134FuEY1CvH0qIl/SWPBPksIkz5UN9vg1BEgIhAH99vbfdedAgjpIES6e9AbLHR/RWWFSJ5Aw1+mgXdO6aBvsA1cr4/dM7zrx8Ms+jPifhAc+xeOue1txP0rFoJi+sayzzdRPy97LTe8ZYVI9uwD6vCTOPOCQ/o99suduEnHFAmRcXRRZQK7503ckerBHjXAxIfY+WuxLKvhDNNT6JRhxVc76Ab509qWGFH2ft84LJAI6iJ54jzNjcvfKe0dXw==;5:G/AQtQaftFvDz2c3DtVTSEVkcbzYPLK0XqNlwUDO0l4l6ybzI9YWXI3Ckei3S+XoRWwpciWiF066yEDZ/+cguA2nnPyooe+5X00atFBYVTyHFzYAtX0+8Cgt5wYNZDFmSJRTBMHBWjBsJJzw7r0ztEnTaXiVUe73sDD5Qw8mUFiDRTck/PmFrusMVmootXviIE2oeaoxeKpjuEZrI0YIsQ==;7:rucf92skUyMltnHSkVjIHoe1TG54WQy/BAuASxJNJ4G6111nfWcE90Ut6klJAmQNqcXLMS/XBgyElPegGHEWJC1deHmjqk3e5qzmdtfvnC1C0nCakr+vyirf58fs6UUYfMO2aWykS4Bouv4zn3bs5A== x-ms-office365-filtering-correlation-id: 05d28b07-cbfb-4f0b-b076-08d688afd229 x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600110)(711020)(4605077)(2017052603328)(7153060)(7193020);SRVR:MWHPR2201MB1439; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: mips.com X-MS-Exchange-CrossTenant-Network-Message-Id: 05d28b07-cbfb-4f0b-b076-08d688afd229 X-MS-Exchange-CrossTenant-originalarrivaltime: 02 Feb 2019 01:43:24.5064 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 463607d3-1db3-40a0-8a29-970c56230104 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR2201MB1439 Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Introduce a new check_mmu_context() function to check an mm's ASID version & get a new one if it's outdated, and a check_switch_mmu_context() function which additionally sets up the new ASID & page directory. Simplify switch_mm() & various get_new_mmu_context() callsites in MIPS KVM by making use of the new functions, which will help reduce the amount of code that requires modification to gain MMID support. Signed-off-by: Paul Burton --- arch/mips/include/asm/mmu_context.h | 8 +++----- arch/mips/kvm/trap_emul.c | 22 ++++------------------ arch/mips/kvm/vz.c | 6 +++--- arch/mips/mm/context.c | 18 ++++++++++++++++++ 4 files changed, 28 insertions(+), 26 deletions(-) diff --git a/arch/mips/include/asm/mmu_context.h b/arch/mips/include/asm/mm= u_context.h index cb39a39d02f6..336682fb48de 100644 --- a/arch/mips/include/asm/mmu_context.h +++ b/arch/mips/include/asm/mmu_context.h @@ -98,6 +98,8 @@ static inline void enter_lazy_tlb(struct mm_struct *mm, s= truct task_struct *tsk) } =20 extern void get_new_mmu_context(struct mm_struct *mm); +extern void check_mmu_context(struct mm_struct *mm); +extern void check_switch_mmu_context(struct mm_struct *mm); =20 /* * Initialize the context related info for a new mm_struct @@ -126,11 +128,7 @@ static inline void switch_mm(struct mm_struct *prev, s= truct mm_struct *next, local_irq_save(flags); =20 htw_stop(); - /* Check if our ASID is of an older version and thus invalid */ - if ((cpu_context(cpu, next) ^ asid_cache(cpu)) & asid_version_mask(cpu)) - get_new_mmu_context(next); - write_c0_entryhi(cpu_asid(cpu, next)); - TLBMISS_HANDLER_SETUP_PGD(next->pgd); + check_switch_mmu_context(next); =20 /* * Mark current->active_mm as not "active" anymore. diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c index 503c2fb7e4da..22ffe72a9e4b 100644 --- a/arch/mips/kvm/trap_emul.c +++ b/arch/mips/kvm/trap_emul.c @@ -1056,11 +1056,7 @@ static int kvm_trap_emul_vcpu_load(struct kvm_vcpu *= vcpu, int cpu) */ if (current->flags & PF_VCPU) { mm =3D KVM_GUEST_KERNEL_MODE(vcpu) ? kern_mm : user_mm; - if ((cpu_context(cpu, mm) ^ asid_cache(cpu)) & - asid_version_mask(cpu)) - get_new_mmu_context(mm); - write_c0_entryhi(cpu_asid(cpu, mm)); - TLBMISS_HANDLER_SETUP_PGD(mm->pgd); + check_switch_mmu_context(mm); kvm_mips_suspend_mm(cpu); ehb(); } @@ -1074,11 +1070,7 @@ static int kvm_trap_emul_vcpu_put(struct kvm_vcpu *v= cpu, int cpu) =20 if (current->flags & PF_VCPU) { /* Restore normal Linux process memory map */ - if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) & - asid_version_mask(cpu))) - get_new_mmu_context(current->mm); - write_c0_entryhi(cpu_asid(cpu, current->mm)); - TLBMISS_HANDLER_SETUP_PGD(current->mm->pgd); + check_switch_mmu_context(current->mm); kvm_mips_resume_mm(cpu); ehb(); } @@ -1228,9 +1220,7 @@ static void kvm_trap_emul_vcpu_reenter(struct kvm_run= *run, * Check if ASID is stale. This may happen due to a TLB flush request or * a lazy user MM invalidation. */ - if ((cpu_context(cpu, mm) ^ asid_cache(cpu)) & - asid_version_mask(cpu)) - get_new_mmu_context(mm); + check_mmu_context(mm); } =20 static int kvm_trap_emul_vcpu_run(struct kvm_run *run, struct kvm_vcpu *vc= pu) @@ -1266,11 +1256,7 @@ static int kvm_trap_emul_vcpu_run(struct kvm_run *ru= n, struct kvm_vcpu *vcpu) cpu =3D smp_processor_id(); =20 /* Restore normal Linux process memory map */ - if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) & - asid_version_mask(cpu))) - get_new_mmu_context(current->mm); - write_c0_entryhi(cpu_asid(cpu, current->mm)); - TLBMISS_HANDLER_SETUP_PGD(current->mm->pgd); + check_switch_mmu_context(current->mm); kvm_mips_resume_mm(cpu); =20 htw_start(); diff --git a/arch/mips/kvm/vz.c b/arch/mips/kvm/vz.c index d98c12a22eac..dde20887a70d 100644 --- a/arch/mips/kvm/vz.c +++ b/arch/mips/kvm/vz.c @@ -2454,10 +2454,10 @@ static void kvm_vz_vcpu_load_tlb(struct kvm_vcpu *v= cpu, int cpu) * Root ASID dealiases guest GPA mappings in the root TLB. * Allocate new root ASID if needed. */ - if (cpumask_test_and_clear_cpu(cpu, &kvm->arch.asid_flush_mask) - || (cpu_context(cpu, gpa_mm) ^ asid_cache(cpu)) & - asid_version_mask(cpu)) + if (cpumask_test_and_clear_cpu(cpu, &kvm->arch.asid_flush_mask)) get_new_mmu_context(gpa_mm); + else + check_mmu_context(gpa_mm); } } =20 diff --git a/arch/mips/mm/context.c b/arch/mips/mm/context.c index b5af471006f0..4dd976acf41d 100644 --- a/arch/mips/mm/context.c +++ b/arch/mips/mm/context.c @@ -17,3 +17,21 @@ void get_new_mmu_context(struct mm_struct *mm) =20 cpu_context(cpu, mm) =3D asid_cache(cpu) =3D asid; } + +void check_mmu_context(struct mm_struct *mm) +{ + unsigned int cpu =3D smp_processor_id(); + + /* Check if our ASID is of an older version and thus invalid */ + if ((cpu_context(cpu, mm) ^ asid_cache(cpu)) & asid_version_mask(cpu)) + get_new_mmu_context(mm); +} + +void check_switch_mmu_context(struct mm_struct *mm) +{ + unsigned int cpu =3D smp_processor_id(); + + check_mmu_context(mm); + write_c0_entryhi(cpu_asid(cpu, mm)); + TLBMISS_HANDLER_SETUP_PGD(mm->pgd); +} --=20 2.20.1