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Thu, 10 Oct 2024 09:04:17 +0100 Date: Thu, 10 Oct 2024 09:04:11 +0100 Message-ID: <874j5kv0xw.wl-maz@kernel.org> From: Marc Zyngier To: Oliver Upton Cc: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, Joey Gouly , Suzuki K Poulose , Zenghui Yu , Alexandru Elisei , Mark Brown Subject: Re: [PATCH v4 20/36] KVM: arm64: Disable hierarchical permissions when S1PIE is enabled In-Reply-To: References: <20241009190019.3222687-1-maz@kernel.org> <20241009190019.3222687-21-maz@kernel.org> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/29.4 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 82.132.186.234 X-SA-Exim-Rcpt-To: oliver.upton@linux.dev, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, alexandru.elisei@arm.com, broonie@kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241010_010421_301745_83FFE050 X-CRM114-Status: GOOD ( 23.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, 10 Oct 2024 08:33:13 +0100, Oliver Upton wrote: > > On Wed, Oct 09, 2024 at 08:00:03PM +0100, Marc Zyngier wrote: > > S1PIE implicitly disables hierarchical permissions, as specified in > > R_JHSVW, by making TCR_ELx.HPDn RES1. > > > > Add a predicate for S1PIE being enabled for a given translation regime, > > and emulate this behaviour by forcing the hpd field to true if S1PIE > > is enabled for that translation regime. > > > > Signed-off-by: Marc Zyngier > > --- > > arch/arm64/kvm/at.c | 19 +++++++++++++++++++ > > 1 file changed, 19 insertions(+) > > > > diff --git a/arch/arm64/kvm/at.c b/arch/arm64/kvm/at.c > > index adcfce3f67f03..f5bd750288ff5 100644 > > --- a/arch/arm64/kvm/at.c > > +++ b/arch/arm64/kvm/at.c > > @@ -93,6 +93,23 @@ static enum trans_regime compute_translation_regime(struct kvm_vcpu *vcpu, u32 o > > } > > } > > > > +static bool s1pie_enabled(struct kvm_vcpu *vcpu, enum trans_regime regime) > > +{ > > + if (!kvm_has_feat(vcpu->kvm, ID_AA64MMFR3_EL1, S1PIE, IMP)) > > + return false; > > + > > + switch (regime) { > > + case TR_EL2: > > + case TR_EL20: > > + return vcpu_read_sys_reg(vcpu, TCR2_EL2) & TCR2_EL2_PIE; > > + case TR_EL10: > > + return (__vcpu_sys_reg(vcpu, HCRX_EL2) & HCRX_EL2_TCR2En) && > > + (__vcpu_sys_reg(vcpu, TCR2_EL1) & TCR2_EL1x_PIE); > > + default: > > + BUG(); > > BUILD_BUG()? Doesn't work. regime is fished out of the walk_info structure, meaning that it is pretty opaque to the compiler, which in turn needs to emit code for all cases. Thanks, M. -- Without deviation from the norm, progress is not possible.