From: Sachin Sant <sachinp@linux.ibm.com>
To: Paul Mackerras <paulus@ozlabs.org>
Cc: kvm-ppc@vger.kernel.org, linuxppc-dev@ozlabs.org,
Michael Neuling <mikey@neuling.org>,
Nick Piggin <npiggin@gmail.com>,
kvm@vger.kernel.org
Subject: Re: [PATCH 3/3] powerpc/kvm: Enable prefixed instructions for HV KVM and disable for PR KVM
Date: Thu, 9 Mar 2023 18:30:17 +0530 [thread overview]
Message-ID: <A5C10FAF-12FC-4D46-A773-AB95DD2D0FD4@linux.ibm.com> (raw)
In-Reply-To: <ZAgs25dCmLrVkBdU@cleo>
> On 08-Mar-2023, at 12:06 PM, Paul Mackerras <paulus@ozlabs.org> wrote:
>
> Now that we can read prefixed instructions from a HV KVM guest and
> emulate prefixed load/store instructions to emulated MMIO locations,
> we can add HFSCR_PREFIXED into the set of bits that are set in the
> HFSCR for a HV KVM guest on POWER10, allowing the guest to use
> prefixed instructions.
>
> PR KVM has not yet been extended to handle prefixed instructions in
> all situations where we might need to emulate them, so prevent the
> guest from enabling prefixed instructions in the FSCR for now.
>
> Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
> Tested-by: Nicholas Piggin <npiggin@gmail.com>
> Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
> ---
Tested on a Power10 system. Prefixed instructions work correctly.
Tested-by: Sachin Sant <sachinp@linux.ibm.com>
> arch/powerpc/include/asm/reg.h | 1 +
> arch/powerpc/kvm/book3s_hv.c | 9 +++++++--
> arch/powerpc/kvm/book3s_pr.c | 2 ++
> arch/powerpc/kvm/book3s_rmhandlers.S | 1 +
> 4 files changed, 11 insertions(+), 2 deletions(-)
>
next prev parent reply other threads:[~2023-03-09 13:01 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-08 6:33 [PATCH 0/3] powerpc/kvm: Enable HV KVM guests to use prefixed instructions to access emulated MMIO Paul Mackerras
2023-03-08 6:34 ` [PATCH 1/3] powerpc/kvm: Make kvmppc_get_last_inst() produce a ppc_inst_t Paul Mackerras
2023-03-08 6:35 ` [PATCH 2/3] powerpc/kvm: Fetch prefixed instructions from the guest Paul Mackerras
2023-03-08 6:36 ` [PATCH 3/3] powerpc/kvm: Enable prefixed instructions for HV KVM and disable for PR KVM Paul Mackerras
2023-03-09 13:00 ` Sachin Sant [this message]
2023-04-06 0:34 ` [PATCH 0/3] powerpc/kvm: Enable HV KVM guests to use prefixed instructions to access emulated MMIO Michael Ellerman
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