From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
To: Juergen Gross <jgross@suse.com>,
xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org
Cc: Stefano Stabellini <sstabellini@kernel.org>,
Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH 1/3] xen: check required Xen features
Date: Mon, 10 May 2021 08:11:56 -0400 [thread overview]
Message-ID: <4282bb6f-1d19-4d00-d468-f5d4c7fb0f90@oracle.com> (raw)
In-Reply-To: <20210422151007.2205-2-jgross@suse.com>
On 4/22/21 11:10 AM, Juergen Gross wrote:
>
> +/*
> + * Linux kernel expects at least Xen 4.0.
> + *
> + * Assume some features to be available for that reason (depending on guest
> + * mode, of course).
> + */
> +#define chk_feature(f) { \
> + if (!xen_feature(f)) \
> + pr_err("Xen: feature %s not available!\n", #f); \
> + }
With your changes in the subsequent patches, are we still going to function properly without those features? (i.e. maybe we should just panic)
(Also, chk_required_features() perhaps?)
-boris
> +
> u8 xen_features[XENFEAT_NR_SUBMAPS * 32] __read_mostly;
> EXPORT_SYMBOL_GPL(xen_features);
>
> @@ -31,4 +44,9 @@ void xen_setup_features(void)
> for (j = 0; j < 32; j++)
> xen_features[i * 32 + j] = !!(fi.submap & 1<<j);
> }
> +
> + if (xen_pv_domain()) {
> + chk_feature(XENFEAT_mmu_pt_update_preserve_ad);
> + chk_feature(XENFEAT_gnttab_map_avail_bits);
> + }
> }
next prev parent reply other threads:[~2021-05-10 12:12 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-22 15:10 [PATCH 0/3] xen: remove some checks for always present Xen features Juergen Gross
2021-04-22 15:10 ` [PATCH 1/3] xen: check required " Juergen Gross
2021-04-22 15:26 ` Stefano Stabellini
2021-04-22 15:32 ` Juergen Gross
2021-05-10 12:11 ` Boris Ostrovsky [this message]
2021-05-10 13:21 ` Juergen Gross
2021-04-22 15:10 ` [PATCH 2/3] xen: assume XENFEAT_mmu_pt_update_preserve_ad being set for pv guests Juergen Gross
2021-04-22 15:10 ` [PATCH 3/3] xen: assume XENFEAT_gnttab_map_avail_bits " Juergen Gross
2021-04-22 15:16 ` [PATCH 0/3] xen: remove some checks for always present Xen features Jan Beulich
2021-04-22 15:17 ` Juergen Gross
2021-04-22 15:23 ` Jan Beulich
2021-04-22 15:28 ` Juergen Gross
2021-04-22 15:42 ` Jan Beulich
2021-04-22 15:49 ` Juergen Gross
2021-04-22 15:51 ` Andrew Cooper
2021-05-10 7:34 ` Juergen Gross
2021-05-10 11:31 ` Peter Zijlstra
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