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Wed, 27 Apr 2022 21:56:29 +0100 Date: Wed, 27 Apr 2022 21:56:29 +0100 Message-ID: <87zgk68cua.wl-maz@kernel.org> From: Marc Zyngier To: Alexandru Elisei Cc: james.morse@arm.com, suzuki.poulose@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu Subject: Re: [PATCH 2/2] KVM/arm64: Print emulated register table name when it is unsorted In-Reply-To: References: <20220425163904.859195-1-alexandru.elisei@arm.com> <20220425163904.859195-3-alexandru.elisei@arm.com> <871qxja6ho.wl-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/27.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: alexandru.elisei@arm.com, james.morse@arm.com, suzuki.poulose@arm.com, linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu 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-20220427_135633_420432_3F192B5E X-CRM114-Status: GOOD ( 34.23 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, 27 Apr 2022 11:21:52 +0100, Alexandru Elisei wrote: > > Hi, > > On Tue, Apr 26, 2022 at 10:18:27PM +0100, Marc Zyngier wrote: > > On Mon, 25 Apr 2022 17:39:03 +0100, > > Alexandru Elisei wrote: > > > > > > When a sysreg table entry is out-of-order, KVM attempts to print the > > > address of the table: > > > > > > [ 0.143881] kvm [1]: sys_reg table (____ptrval____) out of order (0) > > > > > > Printing the name of the table instead of a pointer is more helpful in this > > > case: > > > > > > [ 0.143881] kvm [1]: sys_reg table sys_reg_descs out of order (0) > > > > > > Signed-off-by: Alexandru Elisei > > > --- > > > arch/arm64/kvm/sys_regs.c | 20 +++++++++++--------- > > > 1 file changed, 11 insertions(+), 9 deletions(-) > > > > > > diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c > > > index 57302048afd0..7b62a2daf056 100644 > > > --- a/arch/arm64/kvm/sys_regs.c > > > +++ b/arch/arm64/kvm/sys_regs.c > > > @@ -2188,18 +2188,18 @@ static const struct sys_reg_desc cp15_64_regs[] = { > > > }; > > > > > > static bool check_sysreg_table(const struct sys_reg_desc *table, unsigned int n, > > > - bool is_32) > > > + const char *table_name, bool is_32) > > > { > > > unsigned int i; > > > > > > for (i = 0; i < n; i++) { > > > if (!is_32 && table[i].reg && !table[i].reset) { > > > - kvm_err("sys_reg table %p entry %d lacks reset\n", table, i); > > > + kvm_err("sys_reg table %s entry %d lacks reset\n", table_name, i); > > > > Instead of passing a table name, could we simply use something like > > %pS? If this works, it would be a good indication of both what table > > and what entry in that table is at fault. > > With the change: > > - kvm_err("sys_reg table %s out of order (%d)\n", table_name, i - 1); > + kvm_err("sys_reg table %pS out of order (%d)\n", &table[i - 1], i - 1); > > > this is what KVM prints with %pS if the second entry is out-of-order: > > [ 0.143698] kvm [1]: sys_reg table sys_reg_descs+0x50/0x7490 out of order (1) > > There's redundant information now, the entry can be calculated from the > table offset, but printing the offset directly is certainly convenient. > > I like it more than passing the table name, if you agree I'll send a v2 > with this change. Yup, seems like a valuable change. Thanks, M. -- Without deviation from the norm, progress is not possible. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel