- 03 2月, 2017 21 次提交
-
-
由 James Hogan 提交于
Implement invalidation of specific pairs of GVA page table entries in one or both of the GVA page tables. This is used when existing mappings are replaced in the guest TLB by emulated TLBWI/TLBWR instructions. Due to the sharing of page tables in the host kernel range, we should be careful not to allow host pages to be invalidated. Add a helper kvm_mips_walk_pgd() which can be used when walking of either GPA (future patches) or GVA page tables is needed, optionally with allocation of page tables along the way when they don't exist. GPA page table walking will need to be protected by the kvm->mmu_lock, so we also add a small MMU page cache in each KVM VCPU, like that found for other architectures but smaller. This allows enough pages to be pre-allocated to handle a single fault without holding the lock, allowing the helper to run with the lock held without having to handle allocation failures. Using the same mechanism for GVA allows the same code to be used, and allows it to use the same cache of allocated pages if the GPA walk didn't need to allocate any new tables. Signed-off-by: NJames 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
-
由 James Hogan 提交于
Implement invalidation of large ranges of virtual addresses from GVA page tables in response to a guest ASID change (immediately for guest kernel page table, lazily for guest user page table). We iterate through a range of page tables invalidating entries and freeing fully invalidated tables. To minimise overhead the exact ranges invalidated depends on the flags argument to kvm_mips_flush_gva_pt(), which also allows it to be used in future KVM_CAP_SYNC_MMU patches in response to GPA changes, which unlike guest TLB mapping changes affects guest KSeg0 mappings. Signed-off-by: NJames 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
-
由 James Hogan 提交于
Refactor kvm_mips_host_tlb_inv() to also be able to invalidate any matching TLB entry in the kernel ASID rather than assuming only the TLB entries in the user ASID can change. Two new bool user/kernel arguments allow the caller to indicate whether the mapping should affect each of the ASIDs for guest user/kernel mode. - kvm_mips_invalidate_guest_tlb() (used by TLBWI/TLBWR emulation) can now invalidate any corresponding TLB entry in both the kernel ASID (guest kernel may have accessed any guest mapping), and the user ASID if the entry being replaced is in guest USeg (where guest user may also have accessed it). - The tlbmod fault handler (and the KSeg0 / TLB mapped / commpage fault handlers in later patches) can now invalidate the corresponding TLB entry in whichever ASID is currently active, since only a single page table will have been updated anyway. Signed-off-by: NJames 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
-
由 James Hogan 提交于
kvm_mips_host_tlb_inv() uses the TLBP instruction to probe the host TLB for an entry matching the given guest virtual address, and determines whether a match was found based on whether CP0_Index > 0. This is technically incorrect as an index of 0 (with the high bit clear) is a perfectly valid TLB index. This is harmless at the moment due to the use of at least 1 wired TLB entry for the KVM commpage, however we will soon be ridding ourselves of that particular wired entry so lets fix the condition in case the entry needing invalidation does land at TLB index 0. Signed-off-by: NJames 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
-
由 James Hogan 提交于
Use functions from the general MIPS TLB exception vector generation code (tlbex.c) to construct a fast path TLB refill handler similar to the general one, but cut down and capable of preserving K0 and K1. Signed-off-by: NJames 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
-
由 James Hogan 提交于
tlbex.c uses the implementation dependent $22 CP0 register group on NetLogic cores, with the help of the c0_kscratch() helper. Allow these registers to be allocated by the KVM entry code too instead of assuming KScratch registers are all $31, which will also allow pgd_reg to be handled since it is allocated that way. We also drop the masking of kscratch_mask with 0xfc, as it is redundant for the standard KScratch registers (Config4.KScrExist won't have the low 2 bits set anyway), and apparently not necessary for NetLogic. Signed-off-by: NJames 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
-
由 James Hogan 提交于
Activate the GVA page tables when in guest context. This will allow the normal Linux TLB refill handler to fill from it when guest memory is read, as well as preventing accidental reading from user memory. Signed-off-by: NJames 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
-
由 James Hogan 提交于
Allocate GVA -> HPA page tables for guest kernel and guest user mode on each VCPU, to allow for fast path TLB refill handling to be added later. In the process kvm_arch_vcpu_init() needs updating to pass on any error from the vcpu_init() callback. Signed-off-by: NJames 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
-
由 James Hogan 提交于
Wire up a vcpu uninit implementation callback. This will be used for the clean up of GVA->HPA page tables. Signed-off-by: NJames 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
-
由 James Hogan 提交于
Set init_mm as the active_mm and update mm_cpumask(current->mm) to reflect that it isn't active when in guest context. This prevents cache management code from attempting cache flushes on host virtual addresses while in guest context, for example due to a cache management IPIs or later when writing of dynamically translated code hits copy on write. We do this using helpers in static kernel code to avoid having to export init_mm to modules. Signed-off-by: NJames 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
-
由 James Hogan 提交于
We only need the guest ASID loaded while in guest context, i.e. while running guest code and while handling guest exits. We load the guest ASID when entering the guest, however we restore the host ASID later than necessary, when the VCPU state is saved i.e. vcpu_put() or slightly earlier if preempted after returning to the host. This mismatch is both unpleasant and causes redundant host ASID restores in kvm_trap_emul_vcpu_put(). Lets explicitly restore the host ASID when returning to the host, and don't bother restoring the host ASID on context switch in unless we're already in guest context. Signed-off-by: NJames 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
-
由 James Hogan 提交于
Add implementation callbacks for entering the guest (vcpu_run()) and reentering the guest (vcpu_reenter()), allowing implementation specific operations to be performed before entering the guest or after returning to the host without cluttering kvm_arch_vcpu_ioctl_run(). This allows the T&E specific lazy user GVA flush to be moved into trap_emul.c, along with disabling of the HTW. We also move kvm_mips_deliver_interrupts() as VZ will need to restore the guest timer state prior to delivering interrupts. Signed-off-by: NJames 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
-
由 James Hogan 提交于
The kvm_vcpu_arch structure contains both mm_structs for allocating MMU contexts (primarily the ASID) but it also copies the resulting ASIDs into guest_{user,kernel}_asid[] arrays which are referenced from uasm generated code. This duplication doesn't seem to serve any purpose, and it gets in the way of generalising the ASID handling across guest kernel/user modes, so lets just extract the ASID straight out of the mm_struct on demand, and in fact there are convenient cpu_context() and cpu_asid() macros for doing so. To reduce the verbosity of this code we do also add kern_mm and user_mm local variables where the kernel and user mm_structs are used. Signed-off-by: NJames 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
-
由 James Hogan 提交于
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: NJames 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
-
由 James Hogan 提交于
Convert the get_regs() and set_regs() callbacks to vcpu_load() and vcpu_put(), which provide a cpu argument and more closely match the kvm_arch_vcpu_load() / kvm_arch_vcpu_put() that they are called by. This is in preparation for moving ASID management into the implementations. Signed-off-by: NJames 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
-
由 James Hogan 提交于
KVM T&E uses an ASID for guest kernel mode and an ASID for guest user mode. The current ASID is saved when the guest is scheduled out, and restored when scheduling back in, with checks for whether the ASID needs to be regenerated. This isn't really necessary as the ASID can be easily determined by the current guest mode, so lets simplify it to just read the required ASID from guest_kernel_asid or guest_user_asid even if the ASID hasn't been regenerated. Signed-off-by: NJames 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
-
由 James Hogan 提交于
MIPS incompletely implements the KVM_NMI ioctl to supposedly perform a CPU reset, but all it actually does is invalidate the ASIDs. It doesn't expose the KVM_CAP_USER_NMI capability which is supposed to indicate the presence of the KVM_NMI ioctl, and no user software actually uses it on MIPS. Since this is dead code that would technically need updating for GVA page table handling in upcoming patches, remove it now. If we wanted to implement NMI injection later it can always be done properly along with the KVM_CAP_USER_NMI capability, and if we wanted to implement a proper CPU reset it would be better done with a separate ioctl. Signed-off-by: NJames 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
-
由 James Hogan 提交于
The protected cache ops contain no out of line fixup code to return an error code in the event of a fault, with the cache op being skipped in that case. For KVM however we'd like to detect this case as page faulting will be disabled so it could happen during normal operation if the GVA page tables were flushed, and need to be handled by the caller. Add the out-of-line fixup code to load the error value -EFAULT into the return variable, and adapt the protected cache line functions to pass the error back to the caller. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Acked-by: NRalf Baechle <ralf@linux-mips.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org
-
由 James Hogan 提交于
Export to TLB exception code generating functions so that KVM can construct a fast TLB refill handler for guest context without reinventing the wheel quite so much. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Acked-by: NRalf Baechle <ralf@linux-mips.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org
-
由 James Hogan 提交于
Add include guards in asm/uasm.h to allow it to be safely used by a new header asm/tlbex.h in the next patch to expose TLB exception building functions for KVM to use. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Acked-by: NRalf Baechle <ralf@linux-mips.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org
-
由 James Hogan 提交于
Export pmd_init(), invalid_pmd_table and tlbmiss_handler_setup_pgd to GPL kernel modules so that MIPS KVM can use the inline page table management functions and switch between page tables: - pmd_init() will be used directly by KVM to initialise newly allocated pmd tables with invalid lower level table pointers. - invalid_pmd_table is used by pud_present(), pud_none(), and pud_clear(), which KVM will use to test and clear pud entries. - tlbmiss_handler_setup_pgd() will be called by KVM entry code to switch to the appropriate GVA page tables. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Acked-by: NRalf Baechle <ralf@linux-mips.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org
-
- 02 2月, 2017 2 次提交
-
-
由 James Hogan 提交于
pgd_alloc() references init_mm which is not exported to modules. In order for KVM to be able to use pgd_alloc() to allocate GVA page tables, move pgd_alloc() into a new pgtable.c file and export it to modules. Signed-off-by: NJames Hogan <james.hogan@imgtec.com> Acked-by: NRalf Baechle <ralf@linux-mips.org> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim Krčmář" <rkrcmar@redhat.com> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org
-
由 Markus Elfring 提交于
* Return directly after a call of the function "copy_from_user" failed in a case block. * Delete the jump label "out" which became unnecessary with this refactoring. Signed-off-by: NMarkus Elfring <elfring@users.sourceforge.net> Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NJames Hogan <james.hogan@imgtec.com>
-
- 05 1月, 2017 2 次提交
-
-
由 James Hogan 提交于
Flush the KVM entry code from the icache on all CPUs, not just the one that built the entry code. Signed-off-by: NJames 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 Cc: <stable@vger.kernel.org> # 3.16.x- Signed-off-by: NRadim Krčmář <rkrcmar@redhat.com>
-
由 James Hogan 提交于
On 64-bit kernels, MIPS KVM will clear CP0_Status.UX to prevent the guest (running in user mode) from accessing the 64-bit memory segments. However the previous value of CP0_Status.UX is never restored when exiting from the guest. If the user process uses 64-bit addressing (the n64 ABI) this can result in address error exceptions from the kernel if it needs to deliver a signal before returning to user mode, as the kernel will need to write a sigframe to high user addresses on the user stack which are disallowed by CP0_Status.UX=0. This is fixed by explicitly setting SX and UX again when exiting from the guest, and explicitly clearing those bits when returning to the guest. Having the SX and UX bits set when handling guest exits (rather than only when exiting to userland) will be helpful when we support VZ, since we shouldn't need to directly read or write guest memory, so it will be valid for cache management IPIs to access host user addresses. Signed-off-by: NJames 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 Cc: <stable@vger.kernel.org> # 4.8.x- Signed-off-by: NRadim Krčmář <rkrcmar@redhat.com>
-
- 25 12月, 2016 3 次提交
-
-
由 Thomas Gleixner 提交于
There is no point in having an extra type for extra confusion. u64 is unambiguous. Conversion was done with the following coccinelle script: @rem@ @@ -typedef u64 cycle_t; @fix@ typedef cycle_t; @@ -cycle_t +u64 Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: John Stultz <john.stultz@linaro.org>
-
由 Thomas Gleixner 提交于
When the state names got added a script was used to add the extra argument to the calls. The script basically converted the state constant to a string, but the cleanup to convert these strings into meaningful ones did not happen. Replace all the useless strings with 'subsys/xxx/yyy:state' strings which are used in all the other places already. Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Siewior <bigeasy@linutronix.de> Link: http://lkml.kernel.org/r/20161221192112.085444152@linutronix.deSigned-off-by: NThomas Gleixner <tglx@linutronix.de>
-
由 Linus Torvalds 提交于
This was entirely automated, using the script by Al: PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*<asm/uaccess.h>' sed -i -e "s!$PATT!#include <linux/uaccess.h>!" \ $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h) to do the replacement at the end of the merge window. Requested-by: NAl Viro <viro@zeniv.linux.org.uk> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
-
- 15 12月, 2016 1 次提交
-
-
由 Alexander Duyck 提交于
This change allows us to pass DMA_ATTR_SKIP_CPU_SYNC which allows us to avoid invoking cache line invalidation if the driver will just handle it via a sync_for_cpu or sync_for_device call. Link: http://lkml.kernel.org/r/20161110113513.76501.32321.stgit@ahduyck-blue-test.jf.intel.comSigned-off-by: NAlexander Duyck <alexander.h.duyck@intel.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: Keguang Zhang <keguang.zhang@gmail.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
-
- 14 12月, 2016 1 次提交
-
-
由 Masanari Iida 提交于
This patch fix spelling typos in printk and kconfig. Signed-off-by: NMasanari Iida <standby24x7@gmail.com> Acked-by: NRandy Dunlap <rdunlap@infradead.org> Signed-off-by: NJiri Kosina <jkosina@suse.cz>
-
- 11 12月, 2016 2 次提交
-
-
由 Hauke Mehrtens 提交于
The hardware documentation says bit 11:10 are used for the GPE frequency selection. Fix the mask in the define to match these bits. Signed-off-by: NHauke Mehrtens <hauke@hauke-m.de> Reported-by: NDan Carpenter <dan.carpenter@oracle.com> Reviewed-by: NThomas Langer <thomas.langer@intel.com> Cc: linux-mips@linux-mips.org Cc: john@phrozen.org Patchwork: https://patchwork.linux-mips.org/patch/14648/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
-
由 Luuk Paulussen 提交于
The sync_cmos_clock function in kernel/time/ntp.c first tries to update the internal clock of the cpu by calling the "update_persistent_clock64" architecture specific function. If this returns -ENODEV, it then tries to update an external RTC using "rtc_set_ntp_time". On the mips architecture, the weak implementation of the underlying function would return 0 if it wasn't overridden. This meant that the sync_cmos_clock function would never try to update an external RTC (if both CONFIG_GENERIC_CMOS_UPDATE and CONFIG_RTC_SYSTOHC are configured) Returning -ENODEV instead, means that an external RTC will be tried. Signed-off-by: NLuuk Paulussen <luuk.paulussen@alliedtelesis.co.nz> Reviewed-by: NRichard Laing <richard.laing@alliedtelesis.co.nz> Reviewed-by: NScott Parlane <scott.parlane@alliedtelesis.co.nz> Reviewed-by: NChris Packham <chris.packham@alliedtelesis.co.nz> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/14649/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
-
- 30 11月, 2016 1 次提交
-
-
由 Francis Yan 提交于
This patch exports the sender chronograph stats via the socket SO_TIMESTAMPING channel. Currently we can instrument how long a particular application unit of data was queued in TCP by tracking SOF_TIMESTAMPING_TX_SOFTWARE and SOF_TIMESTAMPING_TX_SCHED. Having these sender chronograph stats exported simultaneously along with these timestamps allow further breaking down the various sender limitation. For example, a video server can tell if a particular chunk of video on a connection takes a long time to deliver because TCP was experiencing small receive window. It is not possible to tell before this patch without packet traces. To prepare these stats, the user needs to set SOF_TIMESTAMPING_OPT_STATS and SOF_TIMESTAMPING_OPT_TSONLY flags while requesting other SOF_TIMESTAMPING TX timestamps. When the timestamps are available in the error queue, the stats are returned in a separate control message of type SCM_TIMESTAMPING_OPT_STATS, in a list of TLVs (struct nlattr) of types: TCP_NLA_BUSY_TIME, TCP_NLA_RWND_LIMITED, TCP_NLA_SNDBUF_LIMITED. Unit is microsecond. Signed-off-by: NFrancis Yan <francisyyan@gmail.com> Signed-off-by: NYuchung Cheng <ycheng@google.com> Signed-off-by: NSoheil Hassas Yeganeh <soheil@google.com> Acked-by: NNeal Cardwell <ncardwell@google.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
-
- 25 11月, 2016 1 次提交
-
-
由 Matt Redfearn 提交于
Since commit 4bcc595c ("printk: reinstate KERN_CONT for printing continuation lines") the output from __do_page_fault on MIPS has been pretty unreadable due to the lack of KERN_CONT markers. Use pr_cont to provide the appropriate markers & restore the expected output. Signed-off-by: NMatt Redfearn <matt.redfearn@imgtec.com> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/14544/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
-
- 24 11月, 2016 1 次提交
-
-
由 Paul Burton 提交于
Since MIPSr6 the Wired register is split into 2 fields, with the upper 16 bits of the register indicating a limit on the value that the wired entry count in the bottom 16 bits of the register can take. This means that simply reading the wired register doesn't get us a valid TLB entry index any longer, and we instead need to retrieve only the lower 16 bits of the register. Introduce a new num_wired_entries() function which does this on MIPSr6 or higher and simply returns the value of the wired register on older architecture revisions, and make use of it when reading the number of wired entries. Since commit e710d666 ("MIPS: tlb-r4k: If there are wired entries, don't use TLBINVF") we have been using a non-zero number of wired entries to determine whether we should avoid use of the tlbinvf instruction (which would invalidate wired entries) and instead loop over TLB entries in local_flush_tlb_all(). This loop begins with the number of wired entries, or before this patch some large bogus TLB index on MIPSr6 systems. Thus since the aforementioned commit some MIPSr6 systems with FTLBs have been prone to leaving stale address translations in the FTLB & crashing in various weird & wonderful ways when we later observe the wrong memory. Signed-off-by: NPaul Burton <paul.burton@imgtec.com> Cc: Matt Redfearn <matt.redfearn@imgtec.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/14557/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>
-
- 23 11月, 2016 1 次提交
-
-
由 Eric W. Biederman 提交于
It is the reasonable expectation that if an executable file is not readable there will be no way for a user without special privileges to read the file. This is enforced in ptrace_attach but if ptrace is already attached before exec there is no enforcement for read-only executables. As the only way to read such an mm is through access_process_vm spin a variant called ptrace_access_vm that will fail if the target process is not being ptraced by the current process, or the current process did not have sufficient privileges when ptracing began to read the target processes mm. In the ptrace implementations replace access_process_vm by ptrace_access_vm. There remain several ptrace sites that still use access_process_vm as they are reading the target executables instructions (for kernel consumption) or register stacks. As such it does not appear necessary to add a permission check to those calls. This bug has always existed in Linux. Fixes: v1.0 Cc: stable@vger.kernel.org Reported-by: NAndy Lutomirski <luto@amacapital.net> Signed-off-by: N"Eric W. Biederman" <ebiederm@xmission.com>
-
- 17 11月, 2016 1 次提交
-
-
由 Christian Borntraeger 提交于
No need to duplicate the same define everywhere. Since the only user is stop-machine and the only provider is s390, we can use a default implementation of cpu_relax_yield() in sched.h. Suggested-by: NRussell King <rmk+kernel@armlinux.org.uk> Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: NDavid Hildenbrand <david@redhat.com> Acked-by: NRussell King <rmk+kernel@armlinux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Noam Camus <noamc@ezchip.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Cc: kvm@vger.kernel.org Cc: linux-arch@vger.kernel.org Cc: linux-s390 <linux-s390@vger.kernel.org> Cc: linuxppc-dev@lists.ozlabs.org Cc: sparclinux@vger.kernel.org Cc: virtualization@lists.linux-foundation.org Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/1479298985-191589-1-git-send-email-borntraeger@de.ibm.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
-
- 16 11月, 2016 2 次提交
-
-
由 Christian Borntraeger 提交于
As there are no users left, we can remove cpu_relax_lowlatency() implementations from every architecture. Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Noam Camus <noamc@ezchip.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Cc: linuxppc-dev@lists.ozlabs.org Cc: virtualization@lists.linux-foundation.org Cc: xen-devel@lists.xenproject.org Cc: <linux-arch@vger.kernel.org> Link: http://lkml.kernel.org/r/1477386195-32736-6-git-send-email-borntraeger@de.ibm.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
-
由 Christian Borntraeger 提交于
For spinning loops people do often use barrier() or cpu_relax(). For most architectures cpu_relax and barrier are the same, but on some architectures cpu_relax can add some latency. For example on power,sparc64 and arc, cpu_relax can shift the CPU towards other hardware threads in an SMT environment. On s390 cpu_relax does even more, it uses an hypercall to the hypervisor to give up the timeslice. In contrast to the SMT yielding this can result in larger latencies. In some places this latency is unwanted, so another variant "cpu_relax_lowlatency" was introduced. Before this is used in more and more places, lets revert the logic and provide a cpu_relax_yield that can be called in places where yielding is more important than latency. By default this is the same as cpu_relax on all architectures. Signed-off-by: NChristian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Noam Camus <noamc@ezchip.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Cc: linuxppc-dev@lists.ozlabs.org Cc: virtualization@lists.linux-foundation.org Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/1477386195-32736-2-git-send-email-borntraeger@de.ibm.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
-
- 05 11月, 2016 1 次提交
-
-
由 Paul Cercueil 提交于
This commit removes two things: - The platform_device that corresponds to the RTC driver, since we now probe this driver from devicetree; - The platform power-off code, since all the jz4740-based platforms are now using the jz4740-rtc driver as the system power controller. Signed-off-by: NPaul Cercueil <paul@crapouillou.net> Acked-by: NMaarten ter Huurne <maarten@treewalker.org> Signed-off-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com>
-