December 2020 - Linux-stable-mirror

[PATCH v1 2/4] s390/kvm: extend guest_translate for MVPG interpretation

by Claudio Imbrenda

Extend guest_translate to optionally return the address of the guest DAT table which caused the exception, and change the return value to int. Also return the appropriate values in the low order bits of the address indicating protection or EDAT. Cc: stable(a)vger.kernel.org Signed-off-by: Claudio Imbrenda <imbrenda(a)linux.ibm.com> --- arch/s390/kvm/gaccess.c | 33 ++++++++++++++++++++++++++++----- 1 file changed, 28 insertions(+), 5 deletions(-) diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c index 6d6b57059493..8e256a233583 100644 --- a/arch/s390/kvm/gaccess.c +++ b/arch/s390/kvm/gaccess.c @@ -598,6 +598,10 @@ static int deref_table(struct kvm *kvm, unsigned long gpa, unsigned long *val) * @asce: effective asce * @mode: indicates the access mode to be used * @prot: returns the type for protection exceptions + * @entryptr: returns the physical address of the last DAT table entry + * processed, additionally setting a few flags in the lower bits + * to indicate whether a translation exception or a protection + * exception were encountered during the address translation. * * Translate a guest virtual address into a guest absolute address by means * of dynamic address translation as specified by the architecture. @@ -611,9 +615,10 @@ static int deref_table(struct kvm *kvm, unsigned long gpa, unsigned long *val) * the returned value is the program interruption code as defined * by the architecture */ -static unsigned long guest_translate(struct kvm_vcpu *vcpu, unsigned long gva, - unsigned long *gpa, const union asce asce, - enum gacc_mode mode, enum prot_type *prot) +static int guest_translate(struct kvm_vcpu *vcpu, unsigned long gva, + unsigned long *gpa, const union asce asce, + enum gacc_mode mode, enum prot_type *prot, + unsigned long *entryptr) { union vaddress vaddr = {.addr = gva}; union raddress raddr = {.addr = gva}; @@ -628,6 +633,8 @@ static unsigned long guest_translate(struct kvm_vcpu *vcpu, unsigned long gva, edat1 = ctlreg0.edat && test_kvm_facility(vcpu->kvm, 8); edat2 = edat1 && test_kvm_facility(vcpu->kvm, 78); iep = ctlreg0.iep && test_kvm_facility(vcpu->kvm, 130); + if (entryptr) + *entryptr = 0; if (asce.r) goto real_address; ptr = asce.origin * PAGE_SIZE; @@ -667,6 +674,8 @@ static unsigned long guest_translate(struct kvm_vcpu *vcpu, unsigned long gva, return PGM_ADDRESSING; if (deref_table(vcpu->kvm, ptr, &rfte.val)) return -EFAULT; + if (entryptr) + *entryptr = ptr; if (rfte.i) return PGM_REGION_FIRST_TRANS; if (rfte.tt != TABLE_TYPE_REGION1) @@ -685,6 +694,8 @@ static unsigned long guest_translate(struct kvm_vcpu *vcpu, unsigned long gva, return PGM_ADDRESSING; if (deref_table(vcpu->kvm, ptr, &rste.val)) return -EFAULT; + if (entryptr) + *entryptr = ptr; if (rste.i) return PGM_REGION_SECOND_TRANS; if (rste.tt != TABLE_TYPE_REGION2) @@ -703,6 +714,8 @@ static unsigned long guest_translate(struct kvm_vcpu *vcpu, unsigned long gva, return PGM_ADDRESSING; if (deref_table(vcpu->kvm, ptr, &rtte.val)) return -EFAULT; + if (entryptr) + *entryptr = ptr; if (rtte.i) return PGM_REGION_THIRD_TRANS; if (rtte.tt != TABLE_TYPE_REGION3) @@ -713,6 +726,8 @@ static unsigned long guest_translate(struct kvm_vcpu *vcpu, unsigned long gva, dat_protection |= rtte.fc1.p; iep_protection = rtte.fc1.iep; raddr.rfaa = rtte.fc1.rfaa; + if (entryptr) + *entryptr |= dat_protection ? 6 : 4; goto absolute_address; } if (vaddr.sx01 < rtte.fc0.tf) @@ -731,6 +746,8 @@ static unsigned long guest_translate(struct kvm_vcpu *vcpu, unsigned long gva, return PGM_ADDRESSING; if (deref_table(vcpu->kvm, ptr, &ste.val)) return -EFAULT; + if (entryptr) + *entryptr = ptr; if (ste.i) return PGM_SEGMENT_TRANSLATION; if (ste.tt != TABLE_TYPE_SEGMENT) @@ -741,6 +758,8 @@ static unsigned long guest_translate(struct kvm_vcpu *vcpu, unsigned long gva, dat_protection |= ste.fc1.p; iep_protection = ste.fc1.iep; raddr.sfaa = ste.fc1.sfaa; + if (entryptr) + *entryptr |= dat_protection ? 6 : 4; goto absolute_address; } dat_protection |= ste.fc0.p; @@ -751,10 +770,14 @@ static unsigned long guest_translate(struct kvm_vcpu *vcpu, unsigned long gva, return PGM_ADDRESSING; if (deref_table(vcpu->kvm, ptr, &pte.val)) return -EFAULT; + if (entryptr) + *entryptr = ptr; if (pte.i) return PGM_PAGE_TRANSLATION; if (pte.z) return PGM_TRANSLATION_SPEC; + if (entryptr && dat_protection) + *entryptr |= 2; dat_protection |= pte.p; iep_protection = pte.iep; raddr.pfra = pte.pfra; @@ -810,7 +833,7 @@ static int guest_page_range(struct kvm_vcpu *vcpu, unsigned long ga, u8 ar, PROT_TYPE_LA); ga &= PAGE_MASK; if (psw_bits(*psw).dat) { - rc = guest_translate(vcpu, ga, pages, asce, mode, &prot); + rc = guest_translate(vcpu, ga, pages, asce, mode, &prot, NULL); if (rc < 0) return rc; } else { @@ -920,7 +943,7 @@ int guest_translate_address(struct kvm_vcpu *vcpu, unsigned long gva, u8 ar, } if (psw_bits(*psw).dat && !asce.r) { /* Use DAT? */ - rc = guest_translate(vcpu, gva, gpa, asce, mode, &prot); + rc = guest_translate(vcpu, gva, gpa, asce, mode, &prot, NULL); if (rc > 0) return trans_exc(vcpu, rc, gva, 0, mode, prot); } else { -- 2.26.2

3 years, 3 months

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[PATCH v1 1/4] s390/kvm: VSIE: stop leaking host addresses

by Claudio Imbrenda

The addresses in the SIE control block of the host should not be forwarded to the guest. They are only meaningful to the host, and moreover it would be a clear security issue. Subsequent patches will actually put the right values in the guest SIE control block. Fixes: a3508fbe9dc6d ("KVM: s390: vsie: initial support for nested virtualization") Cc: stable(a)vger.kernel.org Signed-off-by: Claudio Imbrenda <imbrenda(a)linux.ibm.com> --- arch/s390/kvm/vsie.c | 5 ----- 1 file changed, 5 deletions(-) diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c index 4f3cbf6003a9..ada49583e530 100644 --- a/arch/s390/kvm/vsie.c +++ b/arch/s390/kvm/vsie.c @@ -416,11 +416,6 @@ static void unshadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) memcpy((void *)((u64)scb_o + 0xc0), (void *)((u64)scb_s + 0xc0), 0xf0 - 0xc0); break; - case ICPT_PARTEXEC: - /* MVPG only */ - memcpy((void *)((u64)scb_o + 0xc0), - (void *)((u64)scb_s + 0xc0), 0xd0 - 0xc0); - break; } if (scb_s->ihcpu != 0xffffU) -- 2.26.2

3 years, 3 months

3
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[RESEND PATCH] PCI: qcom: use PHY_REFCLK_USE_PAD only for ipq8064

by Ansuel Smith

The use of PHY_REFCLK_USE_PAD introduced a regression for apq8064 devices. It was tested that while apq doesn't require the padding, ipq SoC must use it or the kernel hangs on boot. Fixes: de3c4bf6489 ("PCI: qcom: Add support for tx term offset for rev 2.1.0") Reported-by: Ilia Mirkin <imirkin(a)alum.mit.edu> Signed-off-by: Ilia Mirkin <imirkin(a)alum.mit.edu> Signed-off-by: Ansuel Smith <ansuelsmth(a)gmail.com> Cc: stable(a)vger.kernel.org # v4.19+ --- drivers/pci/controller/dwc/pcie-qcom.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c index 3aac77a295ba..dad6e9ce66ba 100644 --- a/drivers/pci/controller/dwc/pcie-qcom.c +++ b/drivers/pci/controller/dwc/pcie-qcom.c @@ -387,7 +387,9 @@ static int qcom_pcie_init_2_1_0(struct qcom_pcie *pcie) /* enable external reference clock */ val = readl(pcie->parf + PCIE20_PARF_PHY_REFCLK); - val &= ~PHY_REFCLK_USE_PAD; + /* USE_PAD is required only for ipq806x */ + if (!of_device_is_compatible(node, "qcom,pcie-apq8064")) + val &= ~PHY_REFCLK_USE_PAD; val |= PHY_REFCLK_SSP_EN; writel(val, pcie->parf + PCIE20_PARF_PHY_REFCLK); -- 2.27.0

3 years, 3 months

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[PATCH] mtd: rawnand: gpmi: fix dst bit offset when extracting raw payload

by Sean Nyekjaer

Re-add the multiply by 8 to "step * eccsize" to correct the destination bit offset when extracting the data payload in gpmi_ecc_read_page_raw(). Fixes: e5e5631cc889 ("mtd: rawnand: gpmi: Use nand_extract_bits()") Cc: stable(a)vger.kernel.org Reported-by: Martin Hundebøll <martin(a)geanix.com> Signed-off-by: Sean Nyekjaer <sean(a)geanix.com> --- drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c index dc8104e67506..f0726e69a312 100644 --- a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c +++ b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c @@ -1611,7 +1611,7 @@ static int gpmi_ecc_read_page_raw(struct nand_chip *chip, uint8_t *buf, /* Extract interleaved payload data and ECC bits */ for (step = 0; step < nfc_geo->ecc_chunk_count; step++) { if (buf) - nand_extract_bits(buf, step * eccsize, tmp_buf, + nand_extract_bits(buf, step * eccsize * 8, tmp_buf, src_bit_off, eccsize * 8); src_bit_off += eccsize * 8; -- 2.29.2

3 years, 3 months

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[PATCH] mm/userfaultfd: fix memory corruption due to writeprotect

by Nadav Amit

From: Nadav Amit <namit(a)vmware.com> Userfaultfd self-tests fail occasionally, indicating a memory corruption. Analyzing this problem indicates that there is a real bug since mmap_lock is only taken for read in mwriteprotect_range(). This might cause the TLBs to be in an inconsistent state due to the deferred batched TLB flushes. Consider the following scenario with 3 CPUs (cpu2 is not shown): cpu0 cpu1 ---- ---- userfaultfd_writeprotect() [ write-protecting ] mwriteprotect_range() mmap_read_lock() change_protection() change_protection_range() ... change_pte_range() [ defer TLB flushes] userfaultfd_writeprotect() mmap_read_lock() change_protection() [ write-unprotect ] ... [ unprotect PTE logically ] ... [ page-fault] ... wp_page_copy() [ set new writable page in PTE] At this point no TLB flush took place. cpu2 (not shown) might have a stale writable PTE, which was cached in the TLB before cpu0 called userfaultfd_writeprotect(), and this PTE points to a different page. Therefore, write-protecting of memory, even using userfaultfd, which does not change the vma, requires to prevent any concurrent reader (#PF handler) from reading PTEs from the page-tables if any CPU might still hold in it TLB a PTE with higher permissions for the same address. To do so mmap_lock needs to be taken for write. Surprisingly, memory-unprotection using userfaultfd also poses a problem. Although memory unprotection is logically a promotion of PTE permissions, and therefore should not require a TLB flush, the current code might actually cause a demotion of the permission, and therefore requires a TLB flush. During unprotection of userfaultfd managed memory region, the PTE is not really made writable, but instead marked "logically" as writable, and left for the #PF handler to be handled later. While this is ok, the code currently also *removes* the write permission, and therefore makes it necessary to flush the TLBs. To resolve these problems, acquire mmap_lock for write when write-protecting userfaultfd region using ioctl's. Keep taking mmap_lock for read when unprotecting memory, but keep the write-bit set when resolving userfaultfd write-protection. Cc: Peter Xu <peterx(a)redhat.com> Cc: Andrea Arcangeli <aarcange(a)redhat.com> Cc: Pavel Emelyanov <xemul(a)openvz.org> Cc: Mike Kravetz <mike.kravetz(a)oracle.com> Cc: Mike Rapoport <rppt(a)linux.vnet.ibm.com> Cc: <stable(a)vger.kernel.org> Fixes: 292924b26024 ("userfaultfd: wp: apply _PAGE_UFFD_WP bit") Signed-off-by: Nadav Amit <namit(a)vmware.com> --- mm/mprotect.c | 3 ++- mm/userfaultfd.c | 15 +++++++++++++-- 2 files changed, 15 insertions(+), 3 deletions(-) diff --git a/mm/mprotect.c b/mm/mprotect.c index ab709023e9aa..c08c4055b051 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -75,7 +75,8 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd, oldpte = *pte; if (pte_present(oldpte)) { pte_t ptent; - bool preserve_write = prot_numa && pte_write(oldpte); + bool preserve_write = (prot_numa || uffd_wp_resolve) && + pte_write(oldpte); /* * Avoid trapping faults against the zero or KSM diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c index 9a3d451402d7..7423808640ef 100644 --- a/mm/userfaultfd.c +++ b/mm/userfaultfd.c @@ -652,7 +652,15 @@ int mwriteprotect_range(struct mm_struct *dst_mm, unsigned long start, /* Does the address range wrap, or is the span zero-sized? */ BUG_ON(start + len <= start); - mmap_read_lock(dst_mm); + /* + * Although we do not change the VMA, we have to ensure deferred TLB + * flushes are performed before page-faults can be handled. Otherwise + * we can get inconsistent TLB state. + */ + if (enable_wp) + mmap_write_lock(dst_mm); + else + mmap_read_lock(dst_mm); /* * If memory mappings are changing because of non-cooperative @@ -686,6 +694,9 @@ int mwriteprotect_range(struct mm_struct *dst_mm, unsigned long start, err = 0; out_unlock: - mmap_read_unlock(dst_mm); + if (enable_wp) + mmap_write_unlock(dst_mm); + else + mmap_read_unlock(dst_mm); return err; } -- 2.25.1

3 years, 3 months

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FAILED: patch "[PATCH] iio: imu: st_lsm6dsx: fix edge-trigger interrupts" failed to apply to 4.14-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 3f9bce7a22a3f8ac9d885c9d75bc45569f24ac8b Mon Sep 17 00:00:00 2001 From: Lorenzo Bianconi <lorenzo(a)kernel.org> Date: Sat, 14 Nov 2020 19:39:05 +0100 Subject: [PATCH] iio: imu: st_lsm6dsx: fix edge-trigger interrupts If we are using edge IRQs, new samples can arrive while processing current interrupt since there are no hw guarantees the irq line stays "low" long enough to properly detect the new interrupt. In this case the new sample will be missed. Polling FIFO status register in st_lsm6dsx_handler_thread routine allow us to read new samples even if the interrupt arrives while processing previous data and the timeslot where the line is "low" is too short to be properly detected. Fixes: 89ca88a7cdf2 ("iio: imu: st_lsm6dsx: support active-low interrupts") Fixes: 290a6ce11d93 ("iio: imu: add support to lsm6dsx driver") Signed-off-by: Lorenzo Bianconi <lorenzo(a)kernel.org> Link: https://lore.kernel.org/r/5e93cda7dc1e665f5685c53ad8e9ea71dbae782d.16053788… Cc: <Stable(a)vger.kernel.org> Signed-off-by: Jonathan Cameron <Jonathan.Cameron(a)huawei.com> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c index 467214e2e77c..7cedaab096a7 100644 --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c @@ -2069,19 +2069,35 @@ st_lsm6dsx_report_motion_event(struct st_lsm6dsx_hw *hw) static irqreturn_t st_lsm6dsx_handler_thread(int irq, void *private) { struct st_lsm6dsx_hw *hw = private; + int fifo_len = 0, len; bool event; - int count; event = st_lsm6dsx_report_motion_event(hw); if (!hw->settings->fifo_ops.read_fifo) return event ? IRQ_HANDLED : IRQ_NONE; - mutex_lock(&hw->fifo_lock); - count = hw->settings->fifo_ops.read_fifo(hw); - mutex_unlock(&hw->fifo_lock); + /* + * If we are using edge IRQs, new samples can arrive while + * processing current interrupt since there are no hw + * guarantees the irq line stays "low" long enough to properly + * detect the new interrupt. In this case the new sample will + * be missed. + * Polling FIFO status register allow us to read new + * samples even if the interrupt arrives while processing + * previous data and the timeslot where the line is "low" is + * too short to be properly detected. + */ + do { + mutex_lock(&hw->fifo_lock); + len = hw->settings->fifo_ops.read_fifo(hw); + mutex_unlock(&hw->fifo_lock); + + if (len > 0) + fifo_len += len; + } while (len > 0); - return count || event ? IRQ_HANDLED : IRQ_NONE; + return fifo_len || event ? IRQ_HANDLED : IRQ_NONE; } static int st_lsm6dsx_irq_setup(struct st_lsm6dsx_hw *hw)

3 years, 3 months

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FAILED: patch "[PATCH] ubifs: wbuf: Don't leak kernel memory to flash" failed to apply to 4.14-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 20f1431160c6b590cdc269a846fc5a448abf5b98 Mon Sep 17 00:00:00 2001 From: Richard Weinberger <richard(a)nod.at> Date: Mon, 16 Nov 2020 22:05:30 +0100 Subject: [PATCH] ubifs: wbuf: Don't leak kernel memory to flash Write buffers use a kmalloc()'ed buffer, they can leak up to seven bytes of kernel memory to flash if writes are not aligned. So use ubifs_pad() to fill these gaps with padding bytes. This was never a problem while scanning because the scanner logic manually aligns node lengths and skips over these gaps. Cc: <stable(a)vger.kernel.org> Fixes: 1e51764a3c2ac05a2 ("UBIFS: add new flash file system") Signed-off-by: Richard Weinberger <richard(a)nod.at> Reviewed-by: Zhihao Cheng <chengzhihao1(a)huawei.com> Signed-off-by: Richard Weinberger <richard(a)nod.at> diff --git a/fs/ubifs/io.c b/fs/ubifs/io.c index 2dc933f73165..a9cabb3fa64c 100644 --- a/fs/ubifs/io.c +++ b/fs/ubifs/io.c @@ -319,7 +319,7 @@ void ubifs_pad(const struct ubifs_info *c, void *buf, int pad) { uint32_t crc; - ubifs_assert(c, pad >= 0 && !(pad & 7)); + ubifs_assert(c, pad >= 0); if (pad >= UBIFS_PAD_NODE_SZ) { struct ubifs_ch *ch = buf; @@ -764,6 +764,10 @@ int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len) * write-buffer. */ memcpy(wbuf->buf + wbuf->used, buf, len); + if (aligned_len > len) { + ubifs_assert(c, aligned_len - len < 8); + ubifs_pad(c, wbuf->buf + wbuf->used + len, aligned_len - len); + } if (aligned_len == wbuf->avail) { dbg_io("flush jhead %s wbuf to LEB %d:%d", @@ -856,13 +860,18 @@ int ubifs_wbuf_write_nolock(struct ubifs_wbuf *wbuf, void *buf, int len) } spin_lock(&wbuf->lock); - if (aligned_len) + if (aligned_len) { /* * And now we have what's left and what does not take whole * max. write unit, so write it to the write-buffer and we are * done. */ memcpy(wbuf->buf, buf + written, len); + if (aligned_len > len) { + ubifs_assert(c, aligned_len - len < 8); + ubifs_pad(c, wbuf->buf + len, aligned_len - len); + } + } if (c->leb_size - wbuf->offs >= c->max_write_size) wbuf->size = c->max_write_size;

3 years, 3 months

3
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FAILED: patch "[PATCH] spi: pxa2xx: Fix use-after-free on unbind" failed to apply to 4.14-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.14-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 5626308bb94d9f930aa5f7c77327df4c6daa7759 Mon Sep 17 00:00:00 2001 From: Lukas Wunner <lukas(a)wunner.de> Date: Mon, 7 Dec 2020 09:17:05 +0100 Subject: [PATCH] spi: pxa2xx: Fix use-after-free on unbind pxa2xx_spi_remove() accesses the driver's private data after calling spi_unregister_controller() even though that function releases the last reference on the spi_controller and thereby frees the private data. Fix by switching over to the new devm_spi_alloc_master/slave() helper which keeps the private data accessible until the driver has unbound. Fixes: 32e5b57232c0 ("spi: pxa2xx: Fix controller unregister order") Signed-off-by: Lukas Wunner <lukas(a)wunner.de> Cc: <stable(a)vger.kernel.org> # v2.6.17+: 5e844cc37a5c: spi: Introduce device-managed SPI controller allocation Cc: <stable(a)vger.kernel.org> # v2.6.17+: 32e5b57232c0: spi: pxa2xx: Fix controller unregister order Cc: <stable(a)vger.kernel.org> # v2.6.17+ Link: https://lore.kernel.org/r/5764b04d4a6e43069ebb7808f64c2f774ac6f193.16072868… Signed-off-by: Mark Brown <broonie(a)kernel.org> diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c index 62a0f0f86553..bd2354fd438d 100644 --- a/drivers/spi/spi-pxa2xx.c +++ b/drivers/spi/spi-pxa2xx.c @@ -1691,9 +1691,9 @@ static int pxa2xx_spi_probe(struct platform_device *pdev) } if (platform_info->is_slave) - controller = spi_alloc_slave(dev, sizeof(struct driver_data)); + controller = devm_spi_alloc_slave(dev, sizeof(*drv_data)); else - controller = spi_alloc_master(dev, sizeof(struct driver_data)); + controller = devm_spi_alloc_master(dev, sizeof(*drv_data)); if (!controller) { dev_err(&pdev->dev, "cannot alloc spi_controller\n"); @@ -1916,7 +1916,6 @@ static int pxa2xx_spi_probe(struct platform_device *pdev) free_irq(ssp->irq, drv_data); out_error_controller_alloc: - spi_controller_put(controller); pxa_ssp_free(ssp); return status; }

3 years, 3 months

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FAILED: patch "[PATCH] drm/i915: Fix mismatch between misplaced vma check and vma" failed to apply to 4.19-stable tree

by gregkh＠linuxfoundation.org

The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable(a)vger.kernel.org>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 0e53656ad8abc99e0a80c3de611e593ebbf55829 Mon Sep 17 00:00:00 2001 From: Chris Wilson <chris(a)chris-wilson.co.uk> Date: Wed, 16 Dec 2020 09:29:51 +0000 Subject: [PATCH] drm/i915: Fix mismatch between misplaced vma check and vma insert When inserting a VMA, we restrict the placement to the low 4G unless the caller opts into using the full range. This was done to allow usersapce the opportunity to transition slowly from a 32b address space, and to avoid breaking inherent 32b assumptions of some commands. However, for insert we limited ourselves to 4G-4K, but on verification we allowed the full 4G. This causes some attempts to bind a new buffer to sporadically fail with -ENOSPC, but at other times be bound successfully. commit 48ea1e32c39d ("drm/i915/gen9: Set PIN_ZONE_4G end to 4GB - 1 page") suggests that there is a genuine problem with stateless addressing that cannot utilize the last page in 4G and so we purposefully excluded it. This means that the quick pin pass may cause us to utilize a buggy placement. Reported-by: CQ Tang <cq.tang(a)intel.com> Testcase: igt/gem_exec_params/larger-than-life-batch Fixes: 48ea1e32c39d ("drm/i915/gen9: Set PIN_ZONE_4G end to 4GB - 1 page") Signed-off-by: Chris Wilson <chris(a)chris-wilson.co.uk> Cc: CQ Tang <cq.tang(a)intel.com> Reviewed-by: CQ Tang <cq.tang(a)intel.com> Reviewed-by: Matthew Auld <matthew.auld(a)intel.com> Cc: <stable(a)vger.kernel.org> # v4.5+ Link: https://patchwork.freedesktop.org/patch/msgid/20201216092951.7124-1-chris@c… (cherry picked from commit 5f22cc0b134ab702d7f64b714e26018f7288ffee) Signed-off-by: Jani Nikula <jani.nikula(a)intel.com> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c index b07dc1156a0e..bcc80f428172 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c @@ -382,7 +382,7 @@ eb_vma_misplaced(const struct drm_i915_gem_exec_object2 *entry, return true; if (!(flags & EXEC_OBJECT_SUPPORTS_48B_ADDRESS) && - (vma->node.start + vma->node.size - 1) >> 32) + (vma->node.start + vma->node.size + 4095) >> 32) return true; if (flags & __EXEC_OBJECT_NEEDS_MAP &&

3 years, 3 months

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[PATCH] x86/lib: don't use MMX before FPU initialization

by Krzysztof Mazur

When enabled, the MMX 3DNow! optimized memcpy() is used very early, even before FPU is initialized. It worked fine, but commit 7ad816762f9bf89e940e618ea40c43138b479e10 ("x86/fpu: Reset MXCSR to default in kernel_fpu_begin()") broke that. After that commit the kernel crashes just after "Booting the kernel." message. It affects all kernels with CONFIG_X86_USE_3DNOW=y (enabled when some AMD/Cyrix processors are selected). So, enable MMX 3DNow! optimized memcpy() later. Cc: <stable(a)vger.kernel.org> # 5.8+ Signed-off-by: Krzysztof Mazur <krzysiek(a)podlesie.net> --- Hi, this patch fixes a kernel crash during boot observed on AMD Athlon XP (with CONFIG_MK7=y). The static key adds 5 byte NOP in the "fast" path. The 3DNow! usage can be enabled earlier, but arch_initcall should be ok. The static_cpu_has() does not work because the kernel with CONFIG_X86_USE_3DNOW=y assumes that 3DNOW! is available, so a static key is used instead. "Alternatives" should also work, as long they not assume that required features (REQUIRED_MASK*) are available early. Similar bugs are possible. For easier debugging, maybe kernel_fpu_begin() should catch such cases and print something? Thanks, Krzysiek arch/x86/lib/mmx_32.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/arch/x86/lib/mmx_32.c b/arch/x86/lib/mmx_32.c index 4321fa02e18d..375bf0798993 100644 --- a/arch/x86/lib/mmx_32.c +++ b/arch/x86/lib/mmx_32.c @@ -26,12 +26,14 @@ #include <asm/fpu/api.h> #include <asm/asm.h> +static __ro_after_init DEFINE_STATIC_KEY_FALSE(use_mmx); + void *_mmx_memcpy(void *to, const void *from, size_t len) { void *p; int i; - if (unlikely(in_interrupt())) + if (unlikely(in_interrupt()) || !static_branch_likely(&use_mmx)) return __memcpy(to, from, len); p = to; @@ -376,3 +378,11 @@ void mmx_copy_page(void *to, void *from) fast_copy_page(to, from); } EXPORT_SYMBOL(mmx_copy_page); + +static int __init mmx_32_init(void) +{ + static_branch_enable(&use_mmx); + return 0; +} + +arch_initcall(mmx_32_init); -- 2.27.0.rc1.207.gb85828341f

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Linux-stable-mirror December 2020