LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Maran Wilson <maran.wilson@oracle.com>
To: pbonzini@redhat.com, jgross@suse.com, boris.ostrovsky@oracle.com,
	roger.pau@citrix.com, andrew.cooper3@citrix.com,
	hch@infradead.org, JBeulich@suse.com, x86@kernel.org,
	xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org
Cc: tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com,
	rkrcmar@redhat.com, jpoimboe@redhat.com, bp@suse.de,
	kirill.shutemov@linux.intel.com, thomas.lendacky@amd.com,
	luto@kernel.org, maran.wilson@oracle.com,
	dave.hansen@linux.intel.com, davem@davemloft.net,
	gregkh@linuxfoundation.org, mchehab@kernel.org,
	linus.walleij@linaro.org, rdunlap@infradead.org
Subject: [RFC PATCH v4 6/7] xen/pvh: Add memory map pointer to hvm_start_info struct
Date: Wed, 28 Feb 2018 10:28:02 -0800	[thread overview]
Message-ID: <1519842483-8887-7-git-send-email-maran.wilson@oracle.com> (raw)
In-Reply-To: <1519842483-8887-1-git-send-email-maran.wilson@oracle.com>

The start info structure that is defined as part of the x86/HVM direct boot
ABI and used for starting Xen PVH guests would be more versatile if it also
included a way to pass information about the memory map to the guest. This
would allow KVM guests to share the same entry point.

Signed-off-by: Maran Wilson <maran.wilson@oracle.com>
---
 include/xen/interface/hvm/start_info.h | 50 +++++++++++++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

diff --git a/include/xen/interface/hvm/start_info.h b/include/xen/interface/hvm/start_info.h
index 648415976ead..80cfbd35c1af 100644
--- a/include/xen/interface/hvm/start_info.h
+++ b/include/xen/interface/hvm/start_info.h
@@ -33,7 +33,7 @@
  *    | magic          | Contains the magic value XEN_HVM_START_MAGIC_VALUE
  *    |                | ("xEn3" with the 0x80 bit of the "E" set).
  *  4 +----------------+
- *    | version        | Version of this structure. Current version is 0. New
+ *    | version        | Version of this structure. Current version is 1. New
  *    |                | versions are guaranteed to be backwards-compatible.
  *  8 +----------------+
  *    | flags          | SIF_xxx flags.
@@ -48,6 +48,15 @@
  * 32 +----------------+
  *    | rsdp_paddr     | Physical address of the RSDP ACPI data structure.
  * 40 +----------------+
+ *    | memmap_paddr   | Physical address of the (optional) memory map. Only
+ *    |                | present in version 1 and newer of the structure.
+ * 48 +----------------+
+ *    | memmap_entries | Number of entries in the memory map table. Only
+ *    |                | present in version 1 and newer of the structure.
+ *    |                | Zero if there is no memory map being provided.
+ * 52 +----------------+
+ *    | reserved       | Version 1 and newer only.
+ * 56 +----------------+
  *
  * The layout of each entry in the module structure is the following:
  *
@@ -62,10 +71,34 @@
  *    | reserved       |
  * 32 +----------------+
  *
+ * The layout of each entry in the memory map table is as follows:
+ *
+ *  0 +----------------+
+ *    | addr           | Base address
+ *  8 +----------------+
+ *    | size           | Size of mapping in bytes
+ * 16 +----------------+
+ *    | type           | Type of mapping as defined between the hypervisor
+ *    |                | and guest it's starting. E820_TYPE_xxx, for example.
+ * 20 +----------------|
+ *    | reserved       |
+ * 24 +----------------+
+ *
  * The address and sizes are always a 64bit little endian unsigned integer.
  *
  * NB: Xen on x86 will always try to place all the data below the 4GiB
  * boundary.
+ *
+ * Version numbers of the hvm_start_info structure have evolved like this:
+ *
+ * Version 0:
+ *
+ * Version 1:	Added the memmap_paddr/memmap_entries fields (plus 4 bytes of
+ *		padding) to the end of the hvm_start_info struct. These new
+ *		fields can be used to pass a memory map to the guest. The
+ *		memory map is optional and so guests that understand version 1
+ *		of the structure must check that memmap_entries is non-zero
+ *		before trying to read the memory map.
  */
 #define XEN_HVM_START_MAGIC_VALUE 0x336ec578
 
@@ -86,6 +119,14 @@ struct hvm_start_info {
     uint64_t cmdline_paddr;     /* Physical address of the command line.     */
     uint64_t rsdp_paddr;        /* Physical address of the RSDP ACPI data    */
                                 /* structure.                                */
+    uint64_t memmap_paddr;	/* Physical address of an array of           */
+				/* hvm_memmap_table_entry. Only present in   */
+				/* version 1 and newer of the structure      */
+    uint32_t memmap_entries;	/* Number of entries in the memmap table.    */
+				/* Only present in version 1 and newer of    */
+				/* the structure. Value will be zero if      */
+				/* there is no memory map being provided.    */
+    uint32_t reserved;
 };
 
 struct hvm_modlist_entry {
@@ -95,4 +136,11 @@ struct hvm_modlist_entry {
     uint64_t reserved;
 };
 
+struct hvm_memmap_table_entry {
+    uint64_t addr;		/* Base address of the memory region         */
+    uint64_t size;		/* Size of the memory region in bytes        */
+    uint32_t type;		/* Mapping type                              */
+    uint32_t reserved;
+};
+
 #endif /* __XEN_PUBLIC_ARCH_X86_HVM_START_INFO_H__ */
-- 
2.16.1

  parent reply	other threads:[~2018-02-28 18:28 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-28 18:27 [RFC PATCH v4 0/7] KVM: x86: Allow Qemu/KVM to use PVH entry point Maran Wilson
2018-02-28 18:27 ` [RFC PATCH v4 1/7] xen/pvh: Split CONFIG_XEN_PVH into CONFIG_PVH and CONFIG_XEN_PVH Maran Wilson
2018-02-28 21:07   ` [Xen-devel] " Konrad Rzeszutek Wilk
2018-03-01  5:43     ` Juergen Gross
2018-03-01  7:19   ` Juergen Gross
2018-03-01 15:02   ` Boris Ostrovsky
2018-03-01 15:17     ` Paolo Bonzini
2018-03-01 17:24       ` Maran Wilson
2018-02-28 18:27 ` [RFC PATCH v4 2/7] xen/pvh: Move PVH entry code out of Xen specific tree Maran Wilson
2018-02-28 21:08   ` [Xen-devel] " Konrad Rzeszutek Wilk
2018-02-28 21:35     ` Paolo Bonzini
2018-03-01  6:11       ` Juergen Gross
2018-03-01  8:46         ` Paolo Bonzini
2018-03-01 16:15           ` Boris Ostrovsky
2018-03-01 17:22       ` Maran Wilson
2018-02-28 18:27 ` [RFC PATCH v4 3/7] xen/pvh: Create a new file for Xen specific PVH code Maran Wilson
2018-02-28 21:09   ` [Xen-devel] " Konrad Rzeszutek Wilk
2018-02-28 18:28 ` [RFC PATCH v4 4/7] xen/pvh: Move Xen specific PVH VM initialization out of common code Maran Wilson
2018-02-28 21:10   ` [Xen-devel] " Konrad Rzeszutek Wilk
2018-03-01  7:20   ` Juergen Gross
2018-03-01 16:05   ` Boris Ostrovsky
2018-03-01 17:43     ` Maran Wilson
2018-02-28 18:28 ` [RFC PATCH v4 5/7] xen/pvh: Move Xen code for getting mem map via hcall out of common file Maran Wilson
2018-03-01  7:21   ` Juergen Gross
2018-02-28 18:28 ` Maran Wilson [this message]
2018-03-01  7:29   ` [RFC PATCH v4 6/7] xen/pvh: Add memory map pointer to hvm_start_info struct Juergen Gross
2018-03-01  7:41     ` Jan Beulich
2018-03-01 17:19       ` Maran Wilson
2018-03-01 15:23   ` [Xen-devel] " Konrad Rzeszutek Wilk
2018-02-28 18:28 ` [RFC PATCH v4 7/7] KVM: x86: Allow Qemu/KVM to use PVH entry point Maran Wilson
2018-03-01  7:31   ` Juergen Gross
2018-02-28 21:39 ` [RFC PATCH v4 0/7] " Paolo Bonzini
2018-03-20 19:16 ` [PATCH v5 " Maran Wilson
2018-03-20 19:18   ` [PATCH v5 1/7] xen/pvh: Split CONFIG_XEN_PVH into CONFIG_PVH and CONFIG_XEN_PVH Maran Wilson
2018-03-20 19:23     ` Randy Dunlap
2018-03-20 20:55       ` Maran Wilson
2018-03-20 19:18   ` [PATCH v5 2/7] xen/pvh: Move PVH entry code out of Xen specific tree Maran Wilson
2018-03-20 19:19   ` [PATCH v5 3/7] xen/pvh: Create a new file for Xen specific PVH code Maran Wilson
2018-03-20 19:19   ` [PATCH v5 4/7] xen/pvh: Move Xen specific PVH VM initialization out of common file Maran Wilson
2018-03-20 19:19   ` [PATCH v5 5/7] xen/pvh: Move Xen code for getting mem map via hcall " Maran Wilson
2018-03-20 19:20   ` [PATCH v5 6/7] xen/pvh: Add memory map pointer to hvm_start_info struct Maran Wilson
2018-03-20 19:21   ` [PATCH v5 7/7] KVM: x86: Allow Qemu/KVM to use PVH entry point Maran Wilson

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1519842483-8887-7-git-send-email-maran.wilson@oracle.com \
    --to=maran.wilson@oracle.com \
    --cc=JBeulich@suse.com \
    --cc=andrew.cooper3@citrix.com \
    --cc=boris.ostrovsky@oracle.com \
    --cc=bp@suse.de \
    --cc=dave.hansen@linux.intel.com \
    --cc=davem@davemloft.net \
    --cc=gregkh@linuxfoundation.org \
    --cc=hch@infradead.org \
    --cc=hpa@zytor.com \
    --cc=jgross@suse.com \
    --cc=jpoimboe@redhat.com \
    --cc=kirill.shutemov@linux.intel.com \
    --cc=kvm@vger.kernel.org \
    --cc=linus.walleij@linaro.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=luto@kernel.org \
    --cc=mchehab@kernel.org \
    --cc=mingo@redhat.com \
    --cc=pbonzini@redhat.com \
    --cc=rdunlap@infradead.org \
    --cc=rkrcmar@redhat.com \
    --cc=roger.pau@citrix.com \
    --cc=tglx@linutronix.de \
    --cc=thomas.lendacky@amd.com \
    --cc=x86@kernel.org \
    --cc=xen-devel@lists.xenproject.org \
    --subject='Re: [RFC PATCH v4 6/7] xen/pvh: Add memory map pointer to hvm_start_info struct' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).