linux-kernel - Re: [PATCH v3] KVM: PPC: Book3S PR: Enable MSR_DR for switch_mmu

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Message-Id: <165261089230.1048761.8692230745966082398.b4-ty@ellerman.id.au>
Date:   Sun, 15 May 2022 20:34:52 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Alexander Graf <graf@...zon.com>, kvm@...r.kernel.org
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-kernel@...r.kernel.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Matt Evans <matt@...abs.org>, linuxppc-dev@...ts.ozlabs.org,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH v3] KVM: PPC: Book3S PR: Enable MSR_DR for switch_mmu_context()

On Tue, 10 May 2022 14:37:17 +0200, Alexander Graf wrote:
> Commit 863771a28e27 ("powerpc/32s: Convert switch_mmu_context() to C")
> moved the switch_mmu_context() to C. While in principle a good idea, it
> meant that the function now uses the stack. The stack is not accessible
> from real mode though.
> 
> So to keep calling the function, let's turn on MSR_DR while we call it.
> That way, all pointer references to the stack are handled virtually.
> 
> [...]

Applied to powerpc/fixes.

[1/1] KVM: PPC: Book3S PR: Enable MSR_DR for switch_mmu_context()
      https://git.kernel.org/powerpc/c/ee8348496c77e3737d0a6cda307a521f2cff954f

cheers