Re: [PATCH v3 6/9] kvm: arm/arm64: Add host pmu to support VM introspection

Hi Christoffer, Christoffer Dall writes: > On Wed, Jan 18, 2017 at 06:05:46PM +, Mark Rutland wrote: >> On Wed, Jan 18, 2017 at 04:17:18PM +, Punit Agrawal wrote: >> > Mark Rutland writes: >> > >> > > On Wed, Jan 18, 2017 at

Re: [PATCH v3 6/9] kvm: arm/arm64: Add host pmu to support VM introspection

On Wed, Jan 18, 2017 at 06:05:46PM +, Mark Rutland wrote: > On Wed, Jan 18, 2017 at 04:17:18PM +, Punit Agrawal wrote: > > Mark Rutland writes: > > > > > On Wed, Jan 18, 2017 at 02:51:31PM +, Punit Agrawal wrote: > > >> I should've clarified in my reply that I

Re: [PATCH v3 6/9] kvm: arm/arm64: Add host pmu to support VM introspection

On Wed, Jan 18, 2017 at 04:17:18PM +, Punit Agrawal wrote: > Mark Rutland writes: > > > On Wed, Jan 18, 2017 at 02:51:31PM +, Punit Agrawal wrote: > >> I should've clarified in my reply that I wasn't looking to support the > >> third instance from Mark's examples

Re: [PATCH v3 6/9] kvm: arm/arm64: Add host pmu to support VM introspection

Mark Rutland writes: > On Wed, Jan 18, 2017 at 02:51:31PM +, Punit Agrawal wrote: >> I should've clarified in my reply that I wasn't looking to support the >> third instance from Mark's examples above - "monitor all vCPUs on a >> pCPU". I think it'll be quite expensive

Re: [PATCH v3 6/9] kvm: arm/arm64: Add host pmu to support VM introspection

On Wed, Jan 18, 2017 at 02:51:31PM +, Punit Agrawal wrote: > I should've clarified in my reply that I wasn't looking to support the > third instance from Mark's examples above - "monitor all vCPUs on a > pCPU". I think it'll be quite expensive to figure out which threads from > a given pool

Re: [PATCH v3 6/9] kvm: arm/arm64: Add host pmu to support VM introspection

Will Deacon writes: > On Wed, Jan 18, 2017 at 01:01:40PM +, Punit Agrawal wrote: >> Mark Rutland writes: >> >> > On Wed, Jan 18, 2017 at 11:21:21AM +, Marc Zyngier wrote: >> >> On 10/01/17 11:38, Punit Agrawal wrote: >> >> > +#define VM_MASK

Re: [PATCH v3 6/9] kvm: arm/arm64: Add host pmu to support VM introspection

Marc Zyngier writes: > On 18/01/17 13:01, Punit Agrawal wrote: >> Mark Rutland writes: >> >>> On Wed, Jan 18, 2017 at 11:21:21AM +, Marc Zyngier wrote: On 10/01/17 11:38, Punit Agrawal wrote: > +#define VM_MASK GENMASK_ULL(31, 0) >

Re: [PATCH v3 6/9] kvm: arm/arm64: Add host pmu to support VM introspection

On Wed, Jan 18, 2017 at 01:01:40PM +, Punit Agrawal wrote: > Mark Rutland writes: > > > On Wed, Jan 18, 2017 at 11:21:21AM +, Marc Zyngier wrote: > >> On 10/01/17 11:38, Punit Agrawal wrote: > >> > +#define VM_MASK GENMASK_ULL(31, 0) > >> > +#define EVENT_MASK

Re: [PATCH v3 6/9] kvm: arm/arm64: Add host pmu to support VM introspection

On 18/01/17 13:01, Punit Agrawal wrote: > Mark Rutland writes: > >> On Wed, Jan 18, 2017 at 11:21:21AM +, Marc Zyngier wrote: >>> On 10/01/17 11:38, Punit Agrawal wrote: +#define VM_MASK GENMASK_ULL(31, 0) +#define EVENT_MASKGENMASK_ULL(32, 39)

Re: [PATCH v3 6/9] kvm: arm/arm64: Add host pmu to support VM introspection

On Wed, Jan 18, 2017 at 11:21:21AM +, Marc Zyngier wrote: > On 10/01/17 11:38, Punit Agrawal wrote: > > +#define VM_MASKGENMASK_ULL(31, 0) > > +#define EVENT_MASK GENMASK_ULL(32, 39) > > +#define EVENT_SHIFT(32) > > + > > +#define to_pid(cfg)((cfg) & VM_MASK) > > +#define

Re: [PATCH v3 6/9] kvm: arm/arm64: Add host pmu to support VM introspection

+Mark On 10/01/17 11:38, Punit Agrawal wrote: > Both AArch32 and AArch64 mode of the ARMv8 architecture support trapping > certain VM operations, e.g, TLB and cache maintenance > operations. Selective trapping of these operations for specific VMs can > be used to track the frequency with which

[PATCH v3 6/9] kvm: arm/arm64: Add host pmu to support VM introspection

Both AArch32 and AArch64 mode of the ARMv8 architecture support trapping certain VM operations, e.g, TLB and cache maintenance operations. Selective trapping of these operations for specific VMs can be used to track the frequency with which these occur during execution. Add a software PMU on the