We might have RISC-V systems (such as QEMU) where VMID is not part
of the TLB entry tag so these systems will have to flush all TLB
enteries upon any change in hgatp.VMID.
Currently, we zero-out hgatp CSR in kvm_arch_vcpu_put() and we
re-program hgatp CSR in kvm_arch_vcpu_load(). For above described
systems, this will flush all TLB enteries whenever VCPU exits to
user-space hence reducing performance.
This patch fixes above described performance issue by not clearing
hgatp CSR in kvm_arch_vcpu_put().
Fixes: 34bde9d8b9e6 ("RISC-V: KVM: Implement VCPU world-switch")
Cc: stable(a)vger.kernel.org
Signed-off-by: Anup Patel <apatel(a)ventanamicro.com>
---
arch/riscv/kvm/vcpu.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
index 624166004e36..6785aef4cbd4 100644
--- a/arch/riscv/kvm/vcpu.c
+++ b/arch/riscv/kvm/vcpu.c
@@ -653,8 +653,6 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
vcpu->arch.isa);
kvm_riscv_vcpu_host_fp_restore(&vcpu->arch.host_context);
- csr_write(CSR_HGATP, 0);
-
csr->vsstatus = csr_read(CSR_VSSTATUS);
csr->vsie = csr_read(CSR_VSIE);
csr->vstvec = csr_read(CSR_VSTVEC);
--
2.25.1
Hi stable,
I tried to called you but the network was so bad.
Please download the attached receipt of payment made today 03/16/2022 03:44:48 pm
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Regards
Dr Steve
Hi Reviewers,
This patch fixes a use-after-free error when /proc/lockdep is read by
user after a lockdep splat.
I checked and I think this patch can be applied to stable-5.4 and
later.
commit: 61cc4534b6550997c97a03759ab46b29d44c0017
Subject: locking/lockdep: Avoid potential access of invalid memory in
lock_class
Thanks.
Cheng-Jui Wang
The driver_override field from platform driver should not be initialized
from static memory (string literal) because the core later kfree() it,
for example when driver_override is set via sysfs.
Use dedicated helper to set driver_override properly.
Fixes: 77d8f3068c63 ("clk: imx: scu: add two cells binding support")
Cc: <stable(a)vger.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski(a)canonical.com>
Acked-by: Stephen Boyd <sboyd(a)kernel.org>
---
drivers/clk/imx/clk-scu.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/clk/imx/clk-scu.c b/drivers/clk/imx/clk-scu.c
index 083da31dc3ea..4b2268b7d0d0 100644
--- a/drivers/clk/imx/clk-scu.c
+++ b/drivers/clk/imx/clk-scu.c
@@ -683,7 +683,12 @@ struct clk_hw *imx_clk_scu_alloc_dev(const char *name,
return ERR_PTR(ret);
}
- pdev->driver_override = "imx-scu-clk";
+ ret = driver_set_override(&pdev->dev, &pdev->driver_override,
+ "imx-scu-clk", strlen("imx-scu-clk"));
+ if (ret) {
+ platform_device_put(pdev);
+ return ERR_PTR(ret);
+ }
ret = imx_clk_scu_attach_pd(&pdev->dev, rsrc_id);
if (ret)
--
2.32.0