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xen/pvh: Early bootup changes in PV code (v4).

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We don't use the filtering that 'xen_cpuid' is doing
because the hypervisor treats 'XEN_EMULATE_PREFIX' as
an invalid instruction. This means that all of the filtering
will have to be done in the hypervisor/toolstack.

Without the filtering we expose to the guest the:

 - cpu topology (sockets, cores, etc);
 - the APERF (which the generic scheduler likes to
    use), see  5e62625420
    "xen/setup: filter APERFMPERF cpuid feature out"
 - and the inability to figure out whether MWAIT_LEAF
   should be exposed or not. See
   df88b2d96e
   "xen/enlighten: Disable MWAIT_LEAF so that acpi-pad won't be loaded."
 - x2apic, see  4ea9b9aca9
   "xen: mask x2APIC feature in PV"

We also check for vector callback early on, as it is a required
feature. PVH also runs at default kernel IOPL.

Finally, pure PV settings are moved to a separate function that are
only called for pure PV, ie, pv with pvmmu. They are also #ifdef
with CONFIG_XEN_PVMMU.

Signed-off-by: Mukesh Rathor <mukesh.rathor@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
This commit is contained in:
Mukesh Rathor
2013-12-13 12:45:31 -05:00
committed by Konrad Rzeszutek Wilk
parent ddc416cbc4
commit d285d68314
2 changed files with 46 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

48
arch/x86/xen/enlighten.c
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@@ -46,6 +46,7 @@
#include <xen/hvm.h>
#include <xen/hvc-console.h>
#include <xen/acpi.h>
#include <xen/features.h>
#include <asm/paravirt.h>
#include <asm/apic.h>
@@ -262,8 +263,9 @@ static void __init xen_banner(void)
struct xen_extraversion extra;
HYPERVISOR_xen_version(XENVER_extraversion, &extra);
printk(KERN_INFO "Booting paravirtualized kernel on %s\n",
pv_info.name);
pr_info("Booting paravirtualized kernel %son %s\n",
xen_feature(XENFEAT_auto_translated_physmap) ?
"with PVH extensions " : "", pv_info.name);
printk(KERN_INFO "Xen version: %d.%d%s%s\n",
version >> 16, version & 0xffff, extra.extraversion,
xen_feature(XENFEAT_mmu_pt_update_preserve_ad) ? " (preserve-AD)" : "");
@@ -433,7 +435,7 @@ static void __init xen_init_cpuid_mask(void)
ax = 1;
cx = 0;
xen_cpuid(&ax, &bx, &cx, &dx);
cpuid(1, &ax, &bx, &cx, &dx);
xsave_mask =
(1 << (X86_FEATURE_XSAVE % 32)) |
@@ -1420,6 +1422,19 @@ static void __init xen_setup_stackprotector(void)
pv_cpu_ops.load_gdt = xen_load_gdt;
}
static void __init xen_pvh_early_guest_init(void)
{
if (!xen_feature(XENFEAT_auto_translated_physmap))
return;
if (xen_feature(XENFEAT_hvm_callback_vector))
xen_have_vector_callback = 1;
#ifdef CONFIG_X86_32
BUG(); /* PVH: Implement proper support. */
#endif
}
/* First C function to be called on Xen boot */
asmlinkage void __init xen_start_kernel(void)
{
@@ -1431,13 +1446,16 @@ asmlinkage void __init xen_start_kernel(void)
xen_domain_type = XEN_PV_DOMAIN;
xen_setup_features();
xen_pvh_early_guest_init();
xen_setup_machphys_mapping();
/* Install Xen paravirt ops */
pv_info = xen_info;
pv_init_ops = xen_init_ops;
pv_cpu_ops = xen_cpu_ops;
pv_apic_ops = xen_apic_ops;
if (!xen_pvh_domain())
pv_cpu_ops = xen_cpu_ops;
x86_init.resources.memory_setup = xen_memory_setup;
x86_init.oem.arch_setup = xen_arch_setup;
@@ -1469,8 +1487,6 @@ asmlinkage void __init xen_start_kernel(void)
/* Work out if we support NX */
x86_configure_nx();
xen_setup_features();
/* Get mfn list */
if (!xen_feature(XENFEAT_auto_translated_physmap))
xen_build_dynamic_phys_to_machine();
@@ -1548,14 +1564,18 @@ asmlinkage void __init xen_start_kernel(void)
/* set the limit of our address space */
xen_reserve_top();
/* We used to do this in xen_arch_setup, but that is too late on AMD
* were early_cpu_init (run before ->arch_setup()) calls early_amd_init
* which pokes 0xcf8 port.
*/
set_iopl.iopl = 1;
rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
if (rc != 0)
xen_raw_printk("physdev_op failed %d\n", rc);
/* PVH: runs at default kernel iopl of 0 */
if (!xen_pvh_domain()) {
/*
* We used to do this in xen_arch_setup, but that is too late
* on AMD were early_cpu_init (run before ->arch_setup()) calls
* early_amd_init which pokes 0xcf8 port.
*/
set_iopl.iopl = 1;
rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
if (rc != 0)
xen_raw_printk("physdev_op failed %d\n", rc);
}
#ifdef CONFIG_X86_32
/* set up basic CPUID stuff */