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Date: Sat, 29 Nov 2014 17:21:46 +0100 From: Christoffer Dall <christoffer.dall@...aro.org> To: Andrew Jones <drjones@...hat.com> Cc: Alex Bennée <alex.bennee@...aro.org>, kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu, marc.zyngier@....com, peter.maydell@...aro.org, agraf@...e.de, Lorenzo Pieralisi <lorenzo.pieralisi@....com>, Russell King <linux@....linux.org.uk>, Jonathan Corbet <corbet@....net>, Gleb Natapov <gleb@...nel.org>, jan.kiszka@...mens.com, "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>, Will Deacon <will.deacon@....com>, open list <linux-kernel@...r.kernel.org>, dahi@...ux.vnet.ibm.com, Catalin Marinas <catalin.marinas@....com>, r65777@...escale.com, pbonzini@...hat.com, bp@...e.de Subject: Re: [PATCH 4/7] KVM: arm64: guest debug, add SW break point support On Wed, Nov 26, 2014 at 05:07:20PM +0100, Andrew Jones wrote: > On Tue, Nov 25, 2014 at 04:10:02PM +0000, Alex Bennée wrote: > > This adds support for SW breakpoints inserted by userspace. > > > > First we need to trap all BKPT exceptions in the hypervisor (ELS). This > > in controlled through the MDCR_EL2 register. I've added a new field to > > the vcpu structure to hold this value. There should be scope to > > rationlise this with the VCPU_DEBUG_FLAGS/KVM_ARM64_DEBUG_DIRTY_SHIFT > > manipulation in later patches. > > I think we should start using the new mdcr_el2 field everywhere we plan > to within the same series that it is introduced. Otherwise it's hard > to tell if we need an mdcr_el2 field, or if a more generic field would > suffice. We can always translate bits of a more generic field to > mdcr_el2 bits when necessary, but not the reverse. > Agreed, this is getting messy already with this patch. -Christoffer -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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