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[34.38.54.120]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-477b831421fsm37963635e9.10.2025.11.20.01.55.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Nov 2025 01:55:17 -0800 (PST) Date: Thu, 20 Nov 2025 09:55:14 +0000 From: Vincent Donnefort To: Marc Zyngier Cc: rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, linux-trace-kernel@vger.kernel.org, oliver.upton@linux.dev, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, jstultz@google.com, qperret@google.com, will@kernel.org, aneesh.kumar@kernel.org, kernel-team@android.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH v8 19/28] KVM: arm64: Support unaligned fixmap in the pKVM hyp Message-ID: References: <20251107093840.3779150-1-vdonnefort@google.com> <20251107093840.3779150-20-vdonnefort@google.com> <86ecpurq13.wl-maz@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <86ecpurq13.wl-maz@kernel.org> Hi Marc, Thanks for having a look at the series. On Wed, Nov 19, 2025 at 03:38:32PM +0000, Marc Zyngier wrote: > On Fri, 07 Nov 2025 09:38:31 +0000, > Vincent Donnefort wrote: > > > > Return the fixmap VA with the page offset, instead of the page base > > address. This allows to use hyp_fixmap_map() seamlessly regardless of > > the address alignment. > > > > Signed-off-by: Vincent Donnefort > > > > diff --git a/arch/arm64/kvm/hyp/nvhe/mm.c b/arch/arm64/kvm/hyp/nvhe/mm.c > > index ae8391baebc3..75014dc7d82e 100644 > > --- a/arch/arm64/kvm/hyp/nvhe/mm.c > > +++ b/arch/arm64/kvm/hyp/nvhe/mm.c > > @@ -239,7 +239,7 @@ static void *fixmap_map_slot(struct hyp_fixmap_slot *slot, phys_addr_t phys) > > WRITE_ONCE(*ptep, pte); > > dsb(ishst); > > > > - return (void *)slot->addr; > > + return (void *)slot->addr + offset_in_page(phys); > > } > > > > void *hyp_fixmap_map(phys_addr_t phys) > > This looks slightly odd. fixmap_map_slot() should return *a slot*, not > something in it. Can't hyp_fixmap_map() do that instead? That was fixing hyp_fixblock_map() at the same time. I will move the offset_in_page() in both callers. > > Thanks, > > M. > > -- > Without deviation from the norm, progress is not possible.