From: Daniel Axtens <dja@axtens.net> To: Nicholas Piggin <npiggin@gmail.com>, kvm-ppc@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org, Fabiano Rosas <farosas@linux.ibm.com> Subject: Re: [PATCH v2 05/37] KVM: PPC: Book3S HV: Ensure MSR[ME] is always set in guest MSR Date: Fri, 05 Mar 2021 15:50:59 +1100 [thread overview] Message-ID: <87tupq8aq4.fsf@linkitivity.dja.id.au> (raw) In-Reply-To: <1614383549.rxe6rxw7w8.astroid@bobo.none> >> This 'if' is technically redundant but you mention a future patch warning >> on !(msr & MSR_ME) so I'm holding off on any judgement about the 'if' until >> I get to that patch :) > > That's true. The warning is actually further down when we're setting up > the msr to run in guest mode. At this point the MSR I think comes from > qemu (and arguably the guest setup code shouldn't need to know about HV > specific MSR bits) so a warning here wouldn't be appropriate. > > I could remove the if, although the compiler might already do that. Yes, I think the compiler is almost certainly going to remove that. I'd probably not include the 'if' statement even though it probably gets removed by the compiler but I think that's more a matter of taste than anything else. Kind regards, Daniel > >> >> The patch seems sane to me, I agree that we don't want guests running with >> MSR_ME=0 and kvmppc_set_msr_hv already ensures that the transactional state is >> sane so this is another sanity-enforcement in the same sort of vein. >> >> All up: >> Reviewed-by: Daniel Axtens <dja@axtens.net> > > Thanks, > Nick
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From: Daniel Axtens <dja@axtens.net> To: Nicholas Piggin <npiggin@gmail.com>, kvm-ppc@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org, Fabiano Rosas <farosas@linux.ibm.com> Subject: Re: [PATCH v2 05/37] KVM: PPC: Book3S HV: Ensure MSR[ME] is always set in guest MSR Date: Fri, 05 Mar 2021 04:50:59 +0000 [thread overview] Message-ID: <87tupq8aq4.fsf@linkitivity.dja.id.au> (raw) In-Reply-To: <1614383549.rxe6rxw7w8.astroid@bobo.none> >> This 'if' is technically redundant but you mention a future patch warning >> on !(msr & MSR_ME) so I'm holding off on any judgement about the 'if' until >> I get to that patch :) > > That's true. The warning is actually further down when we're setting up > the msr to run in guest mode. At this point the MSR I think comes from > qemu (and arguably the guest setup code shouldn't need to know about HV > specific MSR bits) so a warning here wouldn't be appropriate. > > I could remove the if, although the compiler might already do that. Yes, I think the compiler is almost certainly going to remove that. I'd probably not include the 'if' statement even though it probably gets removed by the compiler but I think that's more a matter of taste than anything else. Kind regards, Daniel > >> >> The patch seems sane to me, I agree that we don't want guests running with >> MSR_ME=0 and kvmppc_set_msr_hv already ensures that the transactional state is >> sane so this is another sanity-enforcement in the same sort of vein. >> >> All up: >> Reviewed-by: Daniel Axtens <dja@axtens.net> > > Thanks, > Nick
next prev parent reply other threads:[~2021-03-05 4:51 UTC|newest] Thread overview: 134+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-02-25 13:46 [PATCH v2 00/37] KVM: PPC: Book3S: C-ify the P9 entry/exit code Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 01/37] KVM: PPC: Book3S 64: remove unused kvmppc_h_protect argument Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-26 5:01 ` Daniel Axtens 2021-02-26 5:01 ` Daniel Axtens 2021-02-26 23:50 ` Nicholas Piggin 2021-02-26 23:50 ` Nicholas Piggin 2021-03-05 4:45 ` Daniel Axtens 2021-03-05 4:45 ` Daniel Axtens 2021-02-25 13:46 ` [PATCH v2 02/37] KVM: PPC: Book3S HV: Fix CONFIG_SPAPR_TCE_IOMMU=n default hcalls Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-26 5:21 ` Daniel Axtens 2021-02-26 5:21 ` Daniel Axtens 2021-02-25 13:46 ` [PATCH v2 03/37] powerpc/64s: Remove KVM handler support from CBE_RAS interrupts Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 04/37] powerpc/64s: remove KVM SKIP test from instruction breakpoint handler Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-26 5:44 ` Daniel Axtens 2021-02-26 5:44 ` Daniel Axtens 2021-02-26 23:51 ` Nicholas Piggin 2021-02-26 23:51 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 05/37] KVM: PPC: Book3S HV: Ensure MSR[ME] is always set in guest MSR Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-26 6:06 ` Daniel Axtens 2021-02-26 6:06 ` Daniel Axtens 2021-02-26 23:55 ` Nicholas Piggin 2021-02-26 23:55 ` Nicholas Piggin 2021-03-05 4:50 ` Daniel Axtens [this message] 2021-03-05 4:50 ` Daniel Axtens 2021-02-25 13:46 ` [PATCH v2 06/37] KVM: PPC: Book3S 64: move KVM interrupt entry to a common entry point Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-03-05 5:03 ` Daniel Axtens 2021-03-05 5:03 ` Daniel Axtens 2021-02-25 13:46 ` [PATCH v2 07/37] KVM: PPC: Book3S 64: Move GUEST_MODE_SKIP test into KVM Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-03-05 5:54 ` Daniel Axtens 2021-03-05 5:54 ` Daniel Axtens 2021-02-25 13:46 ` [PATCH v2 08/37] KVM: PPC: Book3S 64: add hcall interrupt handler Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-03-05 6:03 ` Daniel Axtens 2021-03-05 6:03 ` Daniel Axtens 2021-02-25 13:46 ` [PATCH v2 09/37] KVM: PPC: Book3S 64: Move hcall early register setup to KVM Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-03-05 6:48 ` Daniel Axtens 2021-03-05 6:48 ` Daniel Axtens 2021-02-25 13:46 ` [PATCH v2 10/37] KVM: PPC: Book3S 64: Move interrupt " Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 11/37] KVM: PPC: Book3S 64: move bad_host_intr check to HV handler Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 12/37] KVM: PPC: Book3S 64: Minimise hcall handler calling convention differences Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 13/37] KVM: PPC: Book3S HV P9: Move radix MMU switching instructions together Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-26 15:56 ` Fabiano Rosas 2021-02-26 15:56 ` Fabiano Rosas 2021-02-26 23:57 ` Nicholas Piggin 2021-02-26 23:57 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 14/37] KVM: PPC: Book3S HV P9: implement kvmppc_xive_pull_vcpu in C Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 15/37] KVM: PPC: Book3S HV P9: Move xive vcpu context management into kvmhv_p9_guest_entry Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 16/37] KVM: PPC: Book3S HV P9: Stop handling hcalls in real-mode in the P9 path Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 14:51 ` Cédric Le Goater 2021-02-25 14:51 ` Cédric Le Goater 2021-02-26 23:59 ` Nicholas Piggin 2021-02-26 23:59 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 17/37] KVM: PPC: Book3S HV P9: Move setting HDEC after switching to guest LPCR Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-26 16:38 ` Fabiano Rosas 2021-02-26 16:38 ` Fabiano Rosas 2021-02-26 23:59 ` Nicholas Piggin 2021-02-26 23:59 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 18/37] KVM: PPC: Book3S HV P9: Use large decrementer for HDEC Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 19/37] KVM: PPC: Book3S HV P9: Use host timer accounting to avoid decrementer read Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 20/37] KVM: PPC: Book3S HV P9: Reduce mftb per guest entry/exit Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 21/37] powerpc: add set_dec_or_work API for safely updating decrementer Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 22/37] KVM: PPC: Book3S HV P9: Reduce irq_work vs guest decrementer races Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 23/37] KVM: PPC: Book3S HV P9: Implement the rest of the P9 path in C Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-26 22:37 ` Fabiano Rosas 2021-02-26 22:37 ` Fabiano Rosas 2021-02-27 0:21 ` Nicholas Piggin 2021-02-27 0:21 ` Nicholas Piggin 2021-02-27 0:55 ` Nicholas Piggin 2021-02-27 0:55 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 24/37] KVM: PPC: Book3S HV P9: inline kvmhv_load_hv_regs_and_go into __kvmhv_vcpu_entry_p9 Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-03-02 13:48 ` Fabiano Rosas 2021-03-02 13:48 ` [PATCH v2 24/37] KVM: PPC: Book3S HV P9: inline kvmhv_load_hv_regs_and_go into __kvmhv_vcpu_entr Fabiano Rosas 2021-02-25 13:46 ` [PATCH v2 25/37] KVM: PPC: Book3S HV P9: Read machine check registers while MSR[RI] is 0 Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 26/37] KVM: PPC: Book3S HV P9: Improve exit timing accounting coverage Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 27/37] KVM: PPC: Book3S HV P9: Move SPR loading after expiry time check Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 28/37] KVM: PPC: Book3S HV P9: Add helpers for OS SPR handling Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-03-02 15:04 ` Fabiano Rosas 2021-03-02 15:04 ` Fabiano Rosas 2021-03-04 11:02 ` Nicholas Piggin 2021-03-04 11:02 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 29/37] KVM: PPC: Book3S HV P9: Switch to guest MMU context as late as possible Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 30/37] KVM: PPC: Book3S HV: Implement radix prefetch workaround by disabling MMU Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-03-02 21:21 ` Fabiano Rosas 2021-03-02 21:21 ` Fabiano Rosas 2021-03-04 11:04 ` Nicholas Piggin 2021-03-04 11:04 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 31/37] KVM: PPC: Book3S HV: Remove support for dependent threads mode on P9 Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 32/37] KVM: PPC: Book3S HV: Remove radix guest support from P7/8 path Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 33/37] KVM: PPC: Book3S HV: small pseries_do_hcall cleanup Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 34/37] KVM: PPC: Book3S HV: add virtual mode handlers for HPT hcalls and page faults Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-03-03 20:09 ` Fabiano Rosas 2021-03-03 20:09 ` Fabiano Rosas 2021-03-04 11:05 ` Nicholas Piggin 2021-03-04 11:05 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 35/37] KVM: PPC: Book3S HV P9: implement hash guest support Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 36/37] KVM: PPC: Book3S HV P9: implement hash host / " Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin 2021-02-25 13:46 ` [PATCH v2 37/37] KVM: PPC: Book3S HV: remove POWER9 support from P7/8 paths Nicholas Piggin 2021-02-25 13:46 ` Nicholas Piggin
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