Re: [patch 22/37] arm64: smp: Switch to hotplug core state synchronization

2023-04-26 Thread Thomas Gleixner
On Wed, Apr 26 2023 at 08:59, Mark Rutland wrote: > On Tue, Apr 25, 2023 at 09:51:12PM +0200, Thomas Gleixner wrote: >> If not then it's just yet another way of DoS which is an "acceptable" >> attack as it only affects availability but not confidentiality. > > Sure. > > My thinking is that this is

Re: [patch 22/37] arm64: smp: Switch to hotplug core state synchronization

2023-04-26 Thread Mark Rutland
On Tue, Apr 25, 2023 at 09:51:12PM +0200, Thomas Gleixner wrote: > On Mon, Apr 17 2023 at 16:50, Mark Rutland wrote: > > As a tangent/aside, we might need to improve that for confidential compute > > architectures, and we might want to generically track cpus which might > > still be > > using

Re: [patch 22/37] arm64: smp: Switch to hotplug core state synchronization

2023-04-25 Thread Thomas Gleixner
On Mon, Apr 17 2023 at 16:50, Mark Rutland wrote: > On Sat, Apr 15, 2023 at 01:44:49AM +0200, Thomas Gleixner wrote: > I gave this a spin on arm64 (in a 64-vCPU VM on an M1 host), and it seems to > work fine with a bunch of vCPUs being hotplugged off and on again randomly. > > FWIW: > > Tested-by:

Re: [patch 22/37] arm64: smp: Switch to hotplug core state synchronization

2023-04-17 Thread Mark Rutland
On Sat, Apr 15, 2023 at 01:44:49AM +0200, Thomas Gleixner wrote: > Switch to the CPU hotplug core state tracking and synchronization > mechanim. No functional change intended. > > Signed-off-by: Thomas Gleixner > Cc: Catalin Marinas > Cc: Will Deacon > Cc: linux-arm-ker...@lists.infradead.org

[patch 22/37] arm64: smp: Switch to hotplug core state synchronization

2023-04-14 Thread Thomas Gleixner
Switch to the CPU hotplug core state tracking and synchronization mechanim. No functional change intended. Signed-off-by: Thomas Gleixner Cc: Catalin Marinas Cc: Will Deacon Cc: linux-arm-ker...@lists.infradead.org --- arch/arm64/Kconfig |1 + arch/arm64/include/asm/smp.h |2