Messages in this thread | | | Subject | Re: [RFC 3/3] KVM: arm64: pmu: Enforce PMEVTYPER evtCount size | From | Auger Eric <> | Date | Thu, 5 Dec 2019 10:37:24 +0100 |
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Hi Will,
On 12/5/19 10:02 AM, Will Deacon wrote: > On Wed, Dec 04, 2019 at 09:44:26PM +0100, Eric Auger wrote: >> ARMv8.1-PMU supports 16-bit evtCount whereas 8.0 only supports >> 10 bits. >> >> On Seatlle which has an 8.0 PMU implementation, evtCount[15:10] >> are not read as 0, as expected. Fix that by applying a mask on >> the selected event that depends on the PMU version. > > Are you sure about that? These bits are RES0 in 8.0 afaict, so this would be > a CPU erratum. Have you checked the SDEN document (I haven't)?
You're right. It is RES0 and not RAZ. My mistake. Please ignore this patch.
Thank you for the feedback.
Eric > > Will >
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