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Subject[PATCH V10 01/14] xen/pvh: Support ParaVirtualized Hardware extensions.
Date
From: Mukesh Rathor <mukesh.rathor@oracle.com>

PVH allows PV linux guest to utilize hardware extended capabilities, such
as running MMU updates in a HVM container.

This patch allows it to be configured and enabled. Also, basic header file
changes to add new subcalls to physmap hypercall.

Lastly, mfn_to_local_pfn must return mfn for paging mode translate
(since we let the hypervisor - or CPU - do them for us).

Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Mukesh Rathor <mukesh.rathor@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
arch/x86/include/asm/xen/page.h | 3 +++
arch/x86/xen/Kconfig | 10 ++++++++++
arch/x86/xen/xen-head.S | 11 ++++++++++-
include/xen/interface/memory.h | 5 ++++-
include/xen/interface/physdev.h | 10 ++++++++++
5 files changed, 37 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
index b913915..65194f7 100644
--- a/arch/x86/include/asm/xen/page.h
+++ b/arch/x86/include/asm/xen/page.h
@@ -168,6 +168,9 @@ static inline xpaddr_t machine_to_phys(xmaddr_t machine)
static inline unsigned long mfn_to_local_pfn(unsigned long mfn)
{
unsigned long pfn = mfn_to_pfn(mfn);
+
+ if (xen_feature(XENFEAT_auto_translated_physmap))
+ return mfn;
if (get_phys_to_machine(pfn) != mfn)
return -1; /* force !pfn_valid() */
return pfn;
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index 1a3c765..4d890c3 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -51,3 +51,13 @@ config XEN_DEBUG_FS
Enable statistics output and various tuning options in debugfs.
Enabling this option may incur a significant performance overhead.

+config XEN_X86_PVH
+ bool "Support for running as a PVH guest (EXPERIMENTAL)"
+ depends on X86_64 && XEN && EXPERIMENTAL
+ default n
+ help
+ This option enables support for running as a PVH guest (PV guest
+ using hardware extensions) under a suitably capable hypervisor.
+ This option is EXPERIMENTAL because the hypervisor interfaces
+ which it uses is not yet considered stable therefore backwards and
+ forwards compatibility is not yet guaranteed. If unsure, say N.
diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S
index 7faed58..1a6bca1 100644
--- a/arch/x86/xen/xen-head.S
+++ b/arch/x86/xen/xen-head.S
@@ -13,6 +13,15 @@
#include <xen/interface/elfnote.h>
#include <asm/xen/interface.h>

+#ifdef CONFIG_XEN_X86_PVH
+#define FEATURES_PVH "|writable_descriptor_tables" \
+ "|auto_translated_physmap" \
+ "|supervisor_mode_kernel" \
+ "|hvm_callback_vector"
+#else
+#define FEATURES_PVH /* Not supported */
+#endif
+
__INIT
ENTRY(startup_xen)
cld
@@ -95,7 +104,7 @@ NEXT_HYPERCALL(arch_6)
#endif
ELFNOTE(Xen, XEN_ELFNOTE_ENTRY, _ASM_PTR startup_xen)
ELFNOTE(Xen, XEN_ELFNOTE_HYPERCALL_PAGE, _ASM_PTR hypercall_page)
- ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .asciz "!writable_page_tables|pae_pgdir_above_4gb")
+ ELFNOTE(Xen, XEN_ELFNOTE_FEATURES, .asciz "!writable_page_tables|pae_pgdir_above_4gb"FEATURES_PVH)
ELFNOTE(Xen, XEN_ELFNOTE_PAE_MODE, .asciz "yes")
ELFNOTE(Xen, XEN_ELFNOTE_LOADER, .asciz "generic")
ELFNOTE(Xen, XEN_ELFNOTE_L1_MFN_VALID,
diff --git a/include/xen/interface/memory.h b/include/xen/interface/memory.h
index 2ecfe4f..a122164 100644
--- a/include/xen/interface/memory.h
+++ b/include/xen/interface/memory.h
@@ -175,7 +175,10 @@ struct xen_add_to_physmap {
uint16_t size;

/* Source mapping space. */
- unsigned int space;
+ uint16_t space;
+ domid_t foreign_domid; /* IFF XENMAPSPACE_gmfn_foreign */
+
+#define XENMAPIDX_grant_table_status 0x80000000

/* Index into source mapping space. */
xen_ulong_t idx;
diff --git a/include/xen/interface/physdev.h b/include/xen/interface/physdev.h
index 42721d1..19d30ad 100644
--- a/include/xen/interface/physdev.h
+++ b/include/xen/interface/physdev.h
@@ -291,6 +291,16 @@ struct physdev_dbgp_op {
} u;
};

+#define PHYSDEVOP_map_iomem 30
+struct physdev_map_iomem {
+ /* IN */
+ uint64_t first_gfn;
+ uint64_t first_mfn;
+ uint32_t nr_mfns;
+ uint32_t add_mapping; /* 1 == add mapping; 0 == unmap */
+
+};
+
/*
* Notify that some PIRQ-bound event channels have been unmasked.
* ** This command is obsolete since interface version 0x00030202 and is **
--
1.7.7.6


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