From: Paolo Bonzini <pbonzini@redhat.com>
To: Tianjia Zhang <tianjia.zhang@linux.alibaba.com>,
tsbogend@alpha.franken.de, paulus@ozlabs.org, mpe@ellerman.id.au,
benh@kernel.crashing.org, borntraeger@de.ibm.com,
frankja@linux.ibm.com, david@redhat.com, cohuck@redhat.com,
heiko.carstens@de.ibm.com, gor@linux.ibm.com,
sean.j.christopherson@intel.com, vkuznets@redhat.com,
wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org,
tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
x86@kernel.org, hpa@zytor.com, maz@kernel.org,
james.morse@arm.com, julien.thierry.kdev@gmail.com,
suzuki.poulose@arm.com, christoffer.dall@arm.com,
peterx@redhat.com, thuth@redhat.com, chenhuacai@gmail.com
Cc: linux-s390@vger.kernel.org, kvm@vger.kernel.org,
linux-mips@vger.kernel.org, kvm-ppc@vger.kernel.org,
linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v6 3/5] KVM: PPC: clean up redundant kvm_run parameters in assembly
Date: Fri, 10 Jul 2020 09:57:02 +0200 [thread overview]
Message-ID: <8947174f-ce16-c076-e208-55e743d9fdf0@redhat.com> (raw)
In-Reply-To: <20200623131418.31473-4-tianjia.zhang@linux.alibaba.com>
On 23/06/20 15:14, Tianjia Zhang wrote:
>
> /* Load non-volatile guest state from the vcpu */
> - VCPU_LOAD_NVGPRS(r4)
> + VCPU_LOAD_NVGPRS(r3)
>
> kvm_start_lightweight:
> /* Copy registers into shadow vcpu so we can access them in real mode */
> - mr r3, r4
> bl FUNC(kvmppc_copy_to_svcpu)
> nop
> - REST_GPR(4, r1)
> + REST_GPR(3, r1)
>
> #ifdef CONFIG_PPC_BOOK3S_64
> /* Get the dcbz32 flag */
> @@ -146,7 +144,7 @@ after_sprg3_load:
Below, there are a bunch of references to r3 and r4 left
rldicl r3, r3, 0, 63 /* r3 &= 1 */
stb r3, HSTATE_RESTORE_HID5(r13)
/* Load up guest SPRG3 value, since it's user readable */
lwz r3, VCPU_SHAREDBE(r4) <<<
cmpwi r3, 0
ld r5, VCPU_SHARED(r4) <<<
where r3 is also destroyed. So I'd rather have three patches:
- one that is as small as possible, changing the prototypes and adding
mr r4, r3
- one that entirely swaps out r3 and r4. This would be the hard one to
review!
- one that cleans up the prologue and epilogue
But overall I think it's simplest to just leave out this patch.
Paolo
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next prev parent reply other threads:[~2020-07-10 7:57 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-23 13:14 [PATCH v6 0/5] clean up redundant 'kvm_run' parameters Tianjia Zhang
2020-06-23 13:14 ` [PATCH v6 1/5] KVM: s390: " Tianjia Zhang
2020-06-23 15:31 ` Christian Borntraeger
2020-06-24 2:39 ` Tianjia Zhang
2020-07-10 7:48 ` Paolo Bonzini
2020-06-23 13:14 ` [PATCH v6 2/5] KVM: arm64: " Tianjia Zhang
2020-06-23 13:14 ` [PATCH v6 3/5] KVM: PPC: clean up redundant kvm_run parameters in assembly Tianjia Zhang
2020-07-10 7:57 ` Paolo Bonzini [this message]
2020-07-23 6:19 ` Paul Mackerras
2020-06-23 13:14 ` [PATCH v6 4/5] KVM: MIPS: clean up redundant 'kvm_run' parameters Tianjia Zhang
2020-06-23 13:14 ` [PATCH v6 5/5] KVM: MIPS: clean up redundant kvm_run parameters in assembly Tianjia Zhang
2020-07-10 7:32 ` [PATCH v6 0/5] clean up redundant 'kvm_run' parameters Tianjia Zhang
2020-07-10 8:06 ` Paolo Bonzini
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