Re: [Qemu-devel] [PATCH 04/10] ppc/xive: Fix TM_PULL_POOL_CTX special operation

[David Gibson <david@gibson.dropbear.id.au>]

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On Sun, Jun 30, 2019 at 10:45:55PM +0200, Cédric Le Goater wrote:
> When a CPU is reseted, the hypervisor (Linux or OPAL) invalidates the
> POOL interrupt context of a CPU with this special command. It returns
> the POOL CAM line value and resets the VP bit.
> 
> Fixes: 4836b45510aa ("ppc/xive: activate HV support")
> Signed-off-by: Cédric Le Goater <clg@kaod.org>

Applied to ppc-for-4.1.

> ---
>  hw/intc/xive.c | 19 ++++++++++---------
>  1 file changed, 10 insertions(+), 9 deletions(-)
> 
> diff --git a/hw/intc/xive.c b/hw/intc/xive.c
> index 534f56f86bd5..cf77bdb7d34a 100644
> --- a/hw/intc/xive.c
> +++ b/hw/intc/xive.c
> @@ -132,6 +132,11 @@ static void xive_tctx_set_cppr(XiveTCTX *tctx, uint8_t ring, uint8_t cppr)
>      xive_tctx_notify(tctx, ring);
>  }
>  
> +static inline uint32_t xive_tctx_word2(uint8_t *ring)
> +{
> +    return *((uint32_t *) &ring[TM_WORD2]);
> +}
> +
>  /*
>   * XIVE Thread Interrupt Management Area (TIMA)
>   */
> @@ -150,11 +155,12 @@ static uint64_t xive_tm_ack_hv_reg(XiveTCTX *tctx, hwaddr offset, unsigned size)
>  static uint64_t xive_tm_pull_pool_ctx(XiveTCTX *tctx, hwaddr offset,
>                                        unsigned size)
>  {
> -    uint64_t ret;
> +    uint32_t qw2w2_prev = xive_tctx_word2(&tctx->regs[TM_QW2_HV_POOL]);
> +    uint32_t qw2w2;
>  
> -    ret = tctx->regs[TM_QW2_HV_POOL + TM_WORD2] & TM_QW2W2_POOL_CAM;
> -    tctx->regs[TM_QW2_HV_POOL + TM_WORD2] &= ~TM_QW2W2_POOL_CAM;
> -    return ret;
> +    qw2w2 = xive_set_field32(TM_QW2W2_VP, qw2w2_prev, 0);
> +    memcpy(&tctx->regs[TM_QW2_HV_POOL + TM_WORD2], &qw2w2, 4);
> +    return qw2w2;
>  }
>  
>  static void xive_tm_vt_push(XiveTCTX *tctx, hwaddr offset,
> @@ -484,11 +490,6 @@ const MemoryRegionOps xive_tm_ops = {
>      },
>  };
>  
> -static inline uint32_t xive_tctx_word2(uint8_t *ring)
> -{
> -    return *((uint32_t *) &ring[TM_WORD2]);
> -}
> -
>  static char *xive_tctx_ring_print(uint8_t *ring)
>  {
>      uint32_t w2 = xive_tctx_word2(ring);

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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