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x86: early PV on HVM features initialization.

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Initialize basic pv on hvm features adding a new Xen HVM specific
hypervisor_x86 structure.

Don't try to initialize xen-kbdfront and xen-fbfront when running on HVM
because the backends are not available.

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
This commit is contained in:
Sheng Yang
2010-05-14 12:39:33 +01:00
committed by Jeremy Fitzhardinge
parent 18f19aa62a
commit bee6ab53e6
6 changed files with 122 additions and 5 deletions
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100
arch/x86/xen/enlighten.c
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@@ -35,6 +35,7 @@
#include <xen/interface/version.h>
#include <xen/interface/physdev.h>
#include <xen/interface/vcpu.h>
#include <xen/interface/memory.h>
#include <xen/features.h>
#include <xen/page.h>
#include <xen/hvc-console.h>
@@ -55,7 +56,9 @@
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/reboot.h>
#include <asm/setup.h>
#include <asm/stackprotector.h>
#include <asm/hypervisor.h>
#include "xen-ops.h"
#include "mmu.h"
@@ -76,6 +79,8 @@ struct shared_info xen_dummy_shared_info;
void *xen_initial_gdt;
RESERVE_BRK(shared_info_page_brk, PAGE_SIZE);
/*
* Point at some empty memory to start with. We map the real shared_info
* page as soon as fixmap is up and running.
@@ -1206,3 +1211,98 @@ asmlinkage void __init xen_start_kernel(void)
x86_64_start_reservations((char *)__pa_symbol(&boot_params));
#endif
}
static uint32_t xen_cpuid_base(void)
{
uint32_t base, eax, ebx, ecx, edx;
char signature[13];
for (base = 0x40000000; base < 0x40010000; base += 0x100) {
cpuid(base, &eax, &ebx, &ecx, &edx);
*(uint32_t *)(signature + 0) = ebx;
*(uint32_t *)(signature + 4) = ecx;
*(uint32_t *)(signature + 8) = edx;
signature[12] = 0;
if (!strcmp("XenVMMXenVMM", signature) && ((eax - base) >= 2))
return base;
}
return 0;
}
static int init_hvm_pv_info(int *major, int *minor)
{
uint32_t eax, ebx, ecx, edx, pages, msr, base;
u64 pfn;
base = xen_cpuid_base();
cpuid(base + 1, &eax, &ebx, &ecx, &edx);
*major = eax >> 16;
*minor = eax & 0xffff;
printk(KERN_INFO "Xen version %d.%d.\n", *major, *minor);
cpuid(base + 2, &pages, &msr, &ecx, &edx);
pfn = __pa(hypercall_page);
wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
xen_setup_features();
pv_info = xen_info;
pv_info.kernel_rpl = 0;
xen_domain_type = XEN_HVM_DOMAIN;
return 0;
}
static void __init init_shared_info(void)
{
struct xen_add_to_physmap xatp;
struct shared_info *shared_info_page;
shared_info_page = (struct shared_info *)
extend_brk(PAGE_SIZE, PAGE_SIZE);
xatp.domid = DOMID_SELF;
xatp.idx = 0;
xatp.space = XENMAPSPACE_shared_info;
xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
BUG();
HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
per_cpu(xen_vcpu, 0) = &HYPERVISOR_shared_info->vcpu_info[0];
}
static void __init xen_hvm_guest_init(void)
{
int r;
int major, minor;
r = init_hvm_pv_info(&major, &minor);
if (r < 0)
return;
init_shared_info();
}
static bool __init xen_hvm_platform(void)
{
if (xen_pv_domain())
return false;
if (!xen_cpuid_base())
return false;
return true;
}
const __refconst struct hypervisor_x86 x86_hyper_xen_hvm = {
.name = "Xen HVM",
.detect = xen_hvm_platform,
.init_platform = xen_hvm_guest_init,
};
EXPORT_SYMBOL(x86_hyper_xen_hvm);