From: James Hogan <james.hogan@imgtec.com> To: <linux-mips@linux-mips.org> Cc: "James Hogan" <james.hogan@imgtec.com>, "Paolo Bonzini" <pbonzini@redhat.com>, "Radim Krčmář" <rkrcmar@redhat.com>, "Ralf Baechle" <ralf@linux-mips.org>, kvm@vger.kernel.org Subject: [PATCH 8/30] KVM: MIPS/MMU: Move preempt/ASID handling to implementation Date: Fri, 6 Jan 2017 01:32:40 +0000 [thread overview] Message-ID: <755ac46208e9f0567e608b81196de629cd9a66f7.1483665879.git-series.james.hogan@imgtec.com> (raw) In-Reply-To: <cover.d6d201de414322ed2c1372e164254e6055ef7db9.1483665879.git-series.james.hogan@imgtec.com> The MIPS KVM host and guest GVA ASIDs may need regenerating when scheduling a process in guest context, which is done from the kvm_arch_vcpu_load() / kvm_arch_vcpu_put() functions in mmu.c. However this is a fairly implementation specific detail. VZ for example may use GuestIDs instead of normal ASIDs to distinguish mappings belonging to different guests, and even on VZ without GuestID the root TLB will be used differently to trap & emulate. Trap & emulate GVA ASIDs only relate to the user part of the full address space, so can be left active during guest exit handling (guest context) to allow guest instructions to be easily read and translated. VZ root ASIDs however are for GPA mappings so can't be left active during normal kernel code. They also aren't useful for accessing guest virtual memory, and we should have CP0_BadInstr[P] registers available to provide encodings of trapping guest instructions anyway. Therefore move the ASID preemption handling into the implementation callback. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org --- arch/mips/kvm/mmu.c | 51 +------------------------------------ arch/mips/kvm/trap_emul.c | 56 ++++++++++++++++++++++++++++++++++++++-- 2 files changed, 54 insertions(+), 53 deletions(-) diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c index ed46528611f4..df013538113f 100644 --- a/arch/mips/kvm/mmu.c +++ b/arch/mips/kvm/mmu.c @@ -235,39 +235,12 @@ static void kvm_mips_migrate_count(struct kvm_vcpu *vcpu) /* Restore ASID once we are scheduled back after preemption */ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { - unsigned long asid_mask = cpu_asid_mask(&cpu_data[cpu]); unsigned long flags; kvm_debug("%s: vcpu %p, cpu: %d\n", __func__, vcpu, cpu); - /* Allocate new kernel and user ASIDs if needed */ - local_irq_save(flags); - if ((vcpu->arch.guest_kernel_asid[cpu] ^ asid_cache(cpu)) & - asid_version_mask(cpu)) { - kvm_get_new_mmu_context(&vcpu->arch.guest_kernel_mm, cpu, vcpu); - vcpu->arch.guest_kernel_asid[cpu] = - vcpu->arch.guest_kernel_mm.context.asid[cpu]; - - kvm_debug("[%d]: cpu_context: %#lx\n", cpu, - cpu_context(cpu, current->mm)); - kvm_debug("[%d]: Allocated new ASID for Guest Kernel: %#x\n", - cpu, vcpu->arch.guest_kernel_asid[cpu]); - } - - if ((vcpu->arch.guest_user_asid[cpu] ^ asid_cache(cpu)) & - asid_version_mask(cpu)) { - kvm_get_new_mmu_context(&vcpu->arch.guest_user_mm, cpu, vcpu); - vcpu->arch.guest_user_asid[cpu] = - vcpu->arch.guest_user_mm.context.asid[cpu]; - - kvm_debug("[%d]: cpu_context: %#lx\n", cpu, - cpu_context(cpu, current->mm)); - kvm_debug("[%d]: Allocated new ASID for Guest User: %#x\n", cpu, - vcpu->arch.guest_user_asid[cpu]); - } - if (vcpu->arch.last_sched_cpu != cpu) { kvm_debug("[%d->%d]KVM VCPU[%d] switch\n", vcpu->arch.last_sched_cpu, cpu, vcpu->vcpu_id); @@ -279,25 +252,10 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) kvm_mips_migrate_count(vcpu); } - /* - * If we preempted while the guest was executing, then reload the ASID - * based on the mode of the Guest (Kernel/User) - */ - if (current->flags & PF_VCPU) { - if (KVM_GUEST_KERNEL_MODE(vcpu)) - write_c0_entryhi(vcpu->arch.guest_kernel_asid[cpu] & - asid_mask); - else - write_c0_entryhi(vcpu->arch.guest_user_asid[cpu] & - asid_mask); - ehb(); - } - /* restore guest state to registers */ kvm_mips_callbacks->vcpu_load(vcpu, cpu); local_irq_restore(flags); - } /* ASID can change if another task is scheduled during preemption */ @@ -314,15 +272,6 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) /* save guest state in registers */ kvm_mips_callbacks->vcpu_put(vcpu, cpu); - if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) & - asid_version_mask(cpu))) { - kvm_debug("%s: Dropping MMU Context: %#lx\n", __func__, - cpu_context(cpu, current->mm)); - drop_mmu_context(current->mm, cpu); - } - write_c0_entryhi(cpu_asid(cpu, current->mm)); - ehb(); - local_irq_restore(flags); } diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c index c0ee51465913..494a90221b5e 100644 --- a/arch/mips/kvm/trap_emul.c +++ b/arch/mips/kvm/trap_emul.c @@ -11,9 +11,9 @@ #include <linux/errno.h> #include <linux/err.h> -#include <linux/vmalloc.h> - #include <linux/kvm_host.h> +#include <linux/vmalloc.h> +#include <asm/mmu_context.h> #include "interrupt.h" @@ -635,6 +635,49 @@ static int kvm_trap_emul_set_one_reg(struct kvm_vcpu *vcpu, static int kvm_trap_emul_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { + unsigned long asid_mask = cpu_asid_mask(&cpu_data[cpu]); + + /* Allocate new kernel and user ASIDs if needed */ + + if ((vcpu->arch.guest_kernel_asid[cpu] ^ asid_cache(cpu)) & + asid_version_mask(cpu)) { + kvm_get_new_mmu_context(&vcpu->arch.guest_kernel_mm, cpu, vcpu); + vcpu->arch.guest_kernel_asid[cpu] = + vcpu->arch.guest_kernel_mm.context.asid[cpu]; + + kvm_debug("[%d]: cpu_context: %#lx\n", cpu, + cpu_context(cpu, current->mm)); + kvm_debug("[%d]: Allocated new ASID for Guest Kernel: %#x\n", + cpu, vcpu->arch.guest_kernel_asid[cpu]); + } + + if ((vcpu->arch.guest_user_asid[cpu] ^ asid_cache(cpu)) & + asid_version_mask(cpu)) { + kvm_get_new_mmu_context(&vcpu->arch.guest_user_mm, cpu, vcpu); + vcpu->arch.guest_user_asid[cpu] = + vcpu->arch.guest_user_mm.context.asid[cpu]; + + kvm_debug("[%d]: cpu_context: %#lx\n", cpu, + cpu_context(cpu, current->mm)); + kvm_debug("[%d]: Allocated new ASID for Guest User: %#x\n", cpu, + vcpu->arch.guest_user_asid[cpu]); + } + + /* + * Were we in guest context? If so then the pre-empted ASID is + * no longer valid, we need to set it to what it should be based + * on the mode of the Guest (Kernel/User) + */ + if (current->flags & PF_VCPU) { + if (KVM_GUEST_KERNEL_MODE(vcpu)) + write_c0_entryhi(vcpu->arch.guest_kernel_asid[cpu] & + asid_mask); + else + write_c0_entryhi(vcpu->arch.guest_user_asid[cpu] & + asid_mask); + ehb(); + } + return 0; } @@ -642,6 +685,15 @@ static int kvm_trap_emul_vcpu_put(struct kvm_vcpu *vcpu, int cpu) { kvm_lose_fpu(vcpu); + if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) & + asid_version_mask(cpu))) { + kvm_debug("%s: Dropping MMU Context: %#lx\n", __func__, + cpu_context(cpu, current->mm)); + drop_mmu_context(current->mm, cpu); + } + write_c0_entryhi(cpu_asid(cpu, current->mm)); + ehb(); + return 0; } -- git-series 0.8.10
WARNING: multiple messages have this Message-ID (diff)
From: James Hogan <james.hogan@imgtec.com> To: linux-mips@linux-mips.org Cc: "James Hogan" <james.hogan@imgtec.com>, "Paolo Bonzini" <pbonzini@redhat.com>, "Radim Krčmář" <rkrcmar@redhat.com>, "Ralf Baechle" <ralf@linux-mips.org>, kvm@vger.kernel.org Subject: [PATCH 8/30] KVM: MIPS/MMU: Move preempt/ASID handling to implementation Date: Fri, 6 Jan 2017 01:32:40 +0000 [thread overview] Message-ID: <755ac46208e9f0567e608b81196de629cd9a66f7.1483665879.git-series.james.hogan@imgtec.com> (raw) Message-ID: <20170106013240.yCqoHpCm0hqJ9uB0ee0Mz9RSN2hC3VdeHbL27Xj3gZ8@z> (raw) In-Reply-To: <cover.d6d201de414322ed2c1372e164254e6055ef7db9.1483665879.git-series.james.hogan@imgtec.com> The MIPS KVM host and guest GVA ASIDs may need regenerating when scheduling a process in guest context, which is done from the kvm_arch_vcpu_load() / kvm_arch_vcpu_put() functions in mmu.c. However this is a fairly implementation specific detail. VZ for example may use GuestIDs instead of normal ASIDs to distinguish mappings belonging to different guests, and even on VZ without GuestID the root TLB will be used differently to trap & emulate. Trap & emulate GVA ASIDs only relate to the user part of the full address space, so can be left active during guest exit handling (guest context) to allow guest instructions to be easily read and translated. VZ root ASIDs however are for GPA mappings so can't be left active during normal kernel code. They also aren't useful for accessing guest virtual memory, and we should have CP0_BadInstr[P] registers available to provide encodings of trapping guest instructions anyway. Therefore move the ASID preemption handling into the implementation callback. Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org --- arch/mips/kvm/mmu.c | 51 +------------------------------------ arch/mips/kvm/trap_emul.c | 56 ++++++++++++++++++++++++++++++++++++++-- 2 files changed, 54 insertions(+), 53 deletions(-) diff --git a/arch/mips/kvm/mmu.c b/arch/mips/kvm/mmu.c index ed46528611f4..df013538113f 100644 --- a/arch/mips/kvm/mmu.c +++ b/arch/mips/kvm/mmu.c @@ -235,39 +235,12 @@ static void kvm_mips_migrate_count(struct kvm_vcpu *vcpu) /* Restore ASID once we are scheduled back after preemption */ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { - unsigned long asid_mask = cpu_asid_mask(&cpu_data[cpu]); unsigned long flags; kvm_debug("%s: vcpu %p, cpu: %d\n", __func__, vcpu, cpu); - /* Allocate new kernel and user ASIDs if needed */ - local_irq_save(flags); - if ((vcpu->arch.guest_kernel_asid[cpu] ^ asid_cache(cpu)) & - asid_version_mask(cpu)) { - kvm_get_new_mmu_context(&vcpu->arch.guest_kernel_mm, cpu, vcpu); - vcpu->arch.guest_kernel_asid[cpu] = - vcpu->arch.guest_kernel_mm.context.asid[cpu]; - - kvm_debug("[%d]: cpu_context: %#lx\n", cpu, - cpu_context(cpu, current->mm)); - kvm_debug("[%d]: Allocated new ASID for Guest Kernel: %#x\n", - cpu, vcpu->arch.guest_kernel_asid[cpu]); - } - - if ((vcpu->arch.guest_user_asid[cpu] ^ asid_cache(cpu)) & - asid_version_mask(cpu)) { - kvm_get_new_mmu_context(&vcpu->arch.guest_user_mm, cpu, vcpu); - vcpu->arch.guest_user_asid[cpu] = - vcpu->arch.guest_user_mm.context.asid[cpu]; - - kvm_debug("[%d]: cpu_context: %#lx\n", cpu, - cpu_context(cpu, current->mm)); - kvm_debug("[%d]: Allocated new ASID for Guest User: %#x\n", cpu, - vcpu->arch.guest_user_asid[cpu]); - } - if (vcpu->arch.last_sched_cpu != cpu) { kvm_debug("[%d->%d]KVM VCPU[%d] switch\n", vcpu->arch.last_sched_cpu, cpu, vcpu->vcpu_id); @@ -279,25 +252,10 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) kvm_mips_migrate_count(vcpu); } - /* - * If we preempted while the guest was executing, then reload the ASID - * based on the mode of the Guest (Kernel/User) - */ - if (current->flags & PF_VCPU) { - if (KVM_GUEST_KERNEL_MODE(vcpu)) - write_c0_entryhi(vcpu->arch.guest_kernel_asid[cpu] & - asid_mask); - else - write_c0_entryhi(vcpu->arch.guest_user_asid[cpu] & - asid_mask); - ehb(); - } - /* restore guest state to registers */ kvm_mips_callbacks->vcpu_load(vcpu, cpu); local_irq_restore(flags); - } /* ASID can change if another task is scheduled during preemption */ @@ -314,15 +272,6 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) /* save guest state in registers */ kvm_mips_callbacks->vcpu_put(vcpu, cpu); - if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) & - asid_version_mask(cpu))) { - kvm_debug("%s: Dropping MMU Context: %#lx\n", __func__, - cpu_context(cpu, current->mm)); - drop_mmu_context(current->mm, cpu); - } - write_c0_entryhi(cpu_asid(cpu, current->mm)); - ehb(); - local_irq_restore(flags); } diff --git a/arch/mips/kvm/trap_emul.c b/arch/mips/kvm/trap_emul.c index c0ee51465913..494a90221b5e 100644 --- a/arch/mips/kvm/trap_emul.c +++ b/arch/mips/kvm/trap_emul.c @@ -11,9 +11,9 @@ #include <linux/errno.h> #include <linux/err.h> -#include <linux/vmalloc.h> - #include <linux/kvm_host.h> +#include <linux/vmalloc.h> +#include <asm/mmu_context.h> #include "interrupt.h" @@ -635,6 +635,49 @@ static int kvm_trap_emul_set_one_reg(struct kvm_vcpu *vcpu, static int kvm_trap_emul_vcpu_load(struct kvm_vcpu *vcpu, int cpu) { + unsigned long asid_mask = cpu_asid_mask(&cpu_data[cpu]); + + /* Allocate new kernel and user ASIDs if needed */ + + if ((vcpu->arch.guest_kernel_asid[cpu] ^ asid_cache(cpu)) & + asid_version_mask(cpu)) { + kvm_get_new_mmu_context(&vcpu->arch.guest_kernel_mm, cpu, vcpu); + vcpu->arch.guest_kernel_asid[cpu] = + vcpu->arch.guest_kernel_mm.context.asid[cpu]; + + kvm_debug("[%d]: cpu_context: %#lx\n", cpu, + cpu_context(cpu, current->mm)); + kvm_debug("[%d]: Allocated new ASID for Guest Kernel: %#x\n", + cpu, vcpu->arch.guest_kernel_asid[cpu]); + } + + if ((vcpu->arch.guest_user_asid[cpu] ^ asid_cache(cpu)) & + asid_version_mask(cpu)) { + kvm_get_new_mmu_context(&vcpu->arch.guest_user_mm, cpu, vcpu); + vcpu->arch.guest_user_asid[cpu] = + vcpu->arch.guest_user_mm.context.asid[cpu]; + + kvm_debug("[%d]: cpu_context: %#lx\n", cpu, + cpu_context(cpu, current->mm)); + kvm_debug("[%d]: Allocated new ASID for Guest User: %#x\n", cpu, + vcpu->arch.guest_user_asid[cpu]); + } + + /* + * Were we in guest context? If so then the pre-empted ASID is + * no longer valid, we need to set it to what it should be based + * on the mode of the Guest (Kernel/User) + */ + if (current->flags & PF_VCPU) { + if (KVM_GUEST_KERNEL_MODE(vcpu)) + write_c0_entryhi(vcpu->arch.guest_kernel_asid[cpu] & + asid_mask); + else + write_c0_entryhi(vcpu->arch.guest_user_asid[cpu] & + asid_mask); + ehb(); + } + return 0; } @@ -642,6 +685,15 @@ static int kvm_trap_emul_vcpu_put(struct kvm_vcpu *vcpu, int cpu) { kvm_lose_fpu(vcpu); + if (((cpu_context(cpu, current->mm) ^ asid_cache(cpu)) & + asid_version_mask(cpu))) { + kvm_debug("%s: Dropping MMU Context: %#lx\n", __func__, + cpu_context(cpu, current->mm)); + drop_mmu_context(current->mm, cpu); + } + write_c0_entryhi(cpu_asid(cpu, current->mm)); + ehb(); + return 0; } -- git-series 0.8.10
next prev parent reply other threads:[~2017-01-06 1:37 UTC|newest] Thread overview: 67+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-01-06 1:32 [PATCH 0/30] KVM: MIPS: Implement GVA page tables James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 1/30] mm: Export init_mm for MIPS KVM use of pgd_alloc() James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-17 16:23 ` Ralf Baechle 2017-01-17 16:27 ` Ralf Baechle 2017-01-06 1:32 ` [PATCH 2/30] MIPS: Export pgd/pmd symbols for KVM James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-17 16:24 ` Ralf Baechle 2017-01-06 1:32 ` [PATCH 3/30] MIPS: uasm: Add include guards in asm/uasm.h James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-17 16:25 ` Ralf Baechle 2017-01-06 1:32 ` [PATCH 4/30] MIPS: Export some tlbex internals for KVM to use James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-17 16:26 ` Ralf Baechle 2017-01-06 1:32 ` [PATCH 5/30] KVM: MIPS: Drop partial KVM_NMI implementation James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 6/30] KVM: MIPS/MMU: Simplify ASID restoration James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 7/30] KVM: MIPS: Convert get/set_regs -> vcpu_load/put James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` James Hogan [this message] 2017-01-06 1:32 ` [PATCH 8/30] KVM: MIPS/MMU: Move preempt/ASID handling to implementation James Hogan 2017-01-06 1:32 ` [PATCH 9/30] KVM: MIPS: Remove duplicated ASIDs from vcpu James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 10/30] KVM: MIPS: Add vcpu_run() & vcpu_reenter() callbacks James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 11/30] KVM: MIPS/T&E: Restore host asid on return to host James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 12/30] KVM: MIPS/T&E: active_mm = init_mm in guest context James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 13/30] KVM: MIPS: Wire up vcpu uninit James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 14/30] KVM: MIPS/T&E: Allocate GVA -> HPA page tables James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 15/30] KVM: MIPS/T&E: Activate GVA page tables in guest context James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 16/30] KVM: MIPS: Support NetLogic KScratch registers James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 17/30] KVM: MIPS: Add fast path TLB refill handler James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 18/30] KVM: MIPS/TLB: Fix off-by-one in TLB invalidate James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 19/30] KVM: MIPS/TLB: Generalise host TLB invalidate to kernel ASID James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 20/30] KVM: MIPS/MMU: Invalidate GVA PTs on ASID changes James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 21/30] KVM: MIPS/MMU: Invalidate stale GVA PTEs on TLBW James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 22/30] KVM: MIPS/MMU: Convert KSeg0 faults to page tables James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 23/30] KVM: MIPS/MMU: Convert TLB mapped " James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 24/30] KVM: MIPS/MMU: Convert commpage fault handling " James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 25/30] KVM: MIPS: Drop vm_init() callback James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 26/30] KVM: MIPS: Use uaccess to read/modify guest instructions James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:32 ` [PATCH 27/30] KVM: MIPS/Emulate: Fix CACHE emulation for EVA hosts James Hogan 2017-01-06 1:32 ` James Hogan 2017-01-06 1:33 ` [PATCH 28/30] KVM: MIPS/TLB: Drop kvm_local_flush_tlb_all() James Hogan 2017-01-06 1:33 ` James Hogan 2017-01-06 1:33 ` [PATCH 29/30] KVM: MIPS/Emulate: Drop redundant TLB flushes on exceptions James Hogan 2017-01-06 1:33 ` James Hogan 2017-01-06 1:33 ` [PATCH 30/30] KVM: MIPS/MMU: Drop kvm_get_new_mmu_context() James Hogan 2017-01-06 1:33 ` James Hogan
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