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From: Wei Liu <wei.liu2@citrix.com>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: <xen-devel@lists.xenproject.org>, <linux-kernel@vger.kernel.org>,
	<jgross@suse.com>, Wei Liu <wei.liu2@citrix.com>
Subject: Re: [Xen-devel] [PATCH] xen/pvh: Indicate XENFEAT_linux_rsdp_unrestricted to Xen
Date: Tue, 10 Apr 2018 09:35:44 +0100	[thread overview]
Message-ID: <20180410083544.q54rapngqie4ler3@citrix.com> (raw)
In-Reply-To: <1523299904-18199-1-git-send-email-boris.ostrovsky@oracle.com>

On Mon, Apr 09, 2018 at 02:51:44PM -0400, Boris Ostrovsky wrote:
> Pre-4.17 kernels ignored start_info's rsdp_paddr pointer and instead
> relied on finding RSDP in standard location in BIOS RO memory. This
> has worked since that's where Xen used to place it.
> 
> However, with recent Xen change (commit 4a5733771e6f ("libxl: put RSDP
> for PVH guest near 4GB")) it prefers to keep RSDP at a "non-standard"
> address. Even though as of commit b17d9d1df3c3 ("x86/xen: Add pvh
> specific rsdp address retrieval function") Linux is able to find RSDP,
> for back-compatibility reasons we need to indicate to Xen that we can
> handle this, an we do so by setting XENFEAT_linux_rsdp_unrestricted
> flag in ELF notes.
> 
> (Also take this opportunity and sync features.h header file with Xen)
> 
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

Reviewed-by: Wei Liu <wei.liu2@citrix.com>

WARNING: multiple messages have this Message-ID (diff)
From: Wei Liu <wei.liu2@citrix.com>
To: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: jgross@suse.com, xen-devel@lists.xenproject.org,
	Wei Liu <wei.liu2@citrix.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] xen/pvh: Indicate XENFEAT_linux_rsdp_unrestricted to Xen
Date: Tue, 10 Apr 2018 09:35:44 +0100	[thread overview]
Message-ID: <20180410083544.q54rapngqie4ler3@citrix.com> (raw)
In-Reply-To: <1523299904-18199-1-git-send-email-boris.ostrovsky@oracle.com>

On Mon, Apr 09, 2018 at 02:51:44PM -0400, Boris Ostrovsky wrote:
> Pre-4.17 kernels ignored start_info's rsdp_paddr pointer and instead
> relied on finding RSDP in standard location in BIOS RO memory. This
> has worked since that's where Xen used to place it.
> 
> However, with recent Xen change (commit 4a5733771e6f ("libxl: put RSDP
> for PVH guest near 4GB")) it prefers to keep RSDP at a "non-standard"
> address. Even though as of commit b17d9d1df3c3 ("x86/xen: Add pvh
> specific rsdp address retrieval function") Linux is able to find RSDP,
> for back-compatibility reasons we need to indicate to Xen that we can
> handle this, an we do so by setting XENFEAT_linux_rsdp_unrestricted
> flag in ELF notes.
> 
> (Also take this opportunity and sync features.h header file with Xen)
> 
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>

Reviewed-by: Wei Liu <wei.liu2@citrix.com>

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  parent reply	other threads:[~2018-04-10  8:45 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-09 18:51 [PATCH] xen/pvh: Indicate XENFEAT_linux_rsdp_unrestricted to Xen Boris Ostrovsky
2018-04-10  5:32 ` Juergen Gross
2018-04-10  5:32 ` Juergen Gross
2018-04-10  8:35 ` Wei Liu [this message]
2018-04-10  8:35   ` Wei Liu
2018-04-10 13:46 ` Boris Ostrovsky
2018-04-10 13:46 ` Boris Ostrovsky

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