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-rw-r--r--arch/x86/xen/Kconfig10
-rw-r--r--arch/x86/xen/enlighten.c8
-rw-r--r--arch/x86/xen/mmu.c49
-rw-r--r--arch/x86/xen/pci-swiotlb-xen.c4
-rw-r--r--arch/x86/xen/setup.c19
-rw-r--r--arch/x86/xen/smp.c32
6 files changed, 106 insertions, 16 deletions
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig
index 90a7f5ad691..5b54892e4bc 100644
--- a/arch/x86/xen/Kconfig
+++ b/arch/x86/xen/Kconfig
@@ -13,6 +13,16 @@ config XEN
kernel to boot in a paravirtualized environment under the
Xen hypervisor.
+config XEN_DOM0
+ def_bool y
+ depends on XEN && PCI_XEN && SWIOTLB_XEN
+ depends on X86_LOCAL_APIC && X86_IO_APIC && ACPI && PCI
+
+# Dummy symbol since people have come to rely on the PRIVILEGED_GUEST
+# name in tools.
+config XEN_PRIVILEGED_GUEST
+ def_bool XEN_DOM0
+
config XEN_PVHVM
def_bool y
depends on XEN
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 44ab12dc2a1..235c0f4d386 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -46,6 +46,7 @@
#include <asm/paravirt.h>
#include <asm/apic.h>
#include <asm/page.h>
+#include <asm/xen/pci.h>
#include <asm/xen/hypercall.h>
#include <asm/xen/hypervisor.h>
#include <asm/fixmap.h>
@@ -59,7 +60,6 @@
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/reboot.h>
-#include <asm/setup.h>
#include <asm/stackprotector.h>
#include <asm/hypervisor.h>
@@ -237,6 +237,7 @@ static __init void xen_init_cpuid_mask(void)
cpuid_leaf1_edx_mask =
~((1 << X86_FEATURE_MCE) | /* disable MCE */
(1 << X86_FEATURE_MCA) | /* disable MCA */
+ (1 << X86_FEATURE_MTRR) | /* disable MTRR */
(1 << X86_FEATURE_ACC)); /* thermal monitoring */
if (!xen_initial_domain())
@@ -1016,7 +1017,7 @@ static void xen_reboot(int reason)
struct sched_shutdown r = { .reason = reason };
#ifdef CONFIG_SMP
- smp_send_stop();
+ stop_other_cpus();
#endif
if (HYPERVISOR_sched_op(SCHEDOP_shutdown, &r))
@@ -1185,6 +1186,7 @@ asmlinkage void __init xen_start_kernel(void)
xen_raw_console_write("mapping kernel into physical memory\n");
pgd = xen_setup_kernel_pagetable(pgd, xen_start_info->nr_pages);
+ xen_ident_map_ISA();
/* Allocate and initialize top and mid mfn levels for p2m structure */
xen_build_mfn_list_list();
@@ -1223,6 +1225,8 @@ asmlinkage void __init xen_start_kernel(void)
add_preferred_console("xenboot", 0, NULL);
add_preferred_console("tty", 0, NULL);
add_preferred_console("hvc", 0, NULL);
+ if (pci_xen)
+ x86_init.pci.arch_init = pci_xen_init;
} else {
/* Make sure ACS will be enabled */
pci_request_acs();
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 9631c90907e..21ed8d7f75a 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1975,6 +1975,7 @@ static void *m2v(phys_addr_t maddr)
return __ka(m2p(maddr));
}
+/* Set the page permissions on an identity-mapped pages */
static void set_page_prot(void *addr, pgprot_t prot)
{
unsigned long pfn = __pa(addr) >> PAGE_SHIFT;
@@ -2125,7 +2126,7 @@ __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd,
{
pmd_t *kernel_pmd;
- level2_kernel_pgt = extend_brk(sizeof(pmd_t *) * PTRS_PER_PMD, PAGE_SIZE);
+ level2_kernel_pgt = extend_brk(sizeof(pmd_t) * PTRS_PER_PMD, PAGE_SIZE);
max_pfn_mapped = PFN_DOWN(__pa(xen_start_info->pt_base) +
xen_start_info->nr_pt_frames * PAGE_SIZE +
@@ -2159,6 +2160,8 @@ __init pgd_t *xen_setup_kernel_pagetable(pgd_t *pgd,
}
#endif /* CONFIG_X86_64 */
+static unsigned char dummy_mapping[PAGE_SIZE] __page_aligned_bss;
+
static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
{
pte_t pte;
@@ -2179,15 +2182,28 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
#else
case VSYSCALL_LAST_PAGE ... VSYSCALL_FIRST_PAGE:
#endif
-#ifdef CONFIG_X86_LOCAL_APIC
- case FIX_APIC_BASE: /* maps dummy local APIC */
-#endif
case FIX_TEXT_POKE0:
case FIX_TEXT_POKE1:
/* All local page mappings */
pte = pfn_pte(phys, prot);
break;
+#ifdef CONFIG_X86_LOCAL_APIC
+ case FIX_APIC_BASE: /* maps dummy local APIC */
+ pte = pfn_pte(PFN_DOWN(__pa(dummy_mapping)), PAGE_KERNEL);
+ break;
+#endif
+
+#ifdef CONFIG_X86_IO_APIC
+ case FIX_IO_APIC_BASE_0 ... FIX_IO_APIC_BASE_END:
+ /*
+ * We just don't map the IO APIC - all access is via
+ * hypercalls. Keep the address in the pte for reference.
+ */
+ pte = pfn_pte(PFN_DOWN(__pa(dummy_mapping)), PAGE_KERNEL);
+ break;
+#endif
+
case FIX_PARAVIRT_BOOTMAP:
/* This is an MFN, but it isn't an IO mapping from the
IO domain */
@@ -2212,6 +2228,29 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t phys, pgprot_t prot)
#endif
}
+__init void xen_ident_map_ISA(void)
+{
+ unsigned long pa;
+
+ /*
+ * If we're dom0, then linear map the ISA machine addresses into
+ * the kernel's address space.
+ */
+ if (!xen_initial_domain())
+ return;
+
+ xen_raw_printk("Xen: setup ISA identity maps\n");
+
+ for (pa = ISA_START_ADDRESS; pa < ISA_END_ADDRESS; pa += PAGE_SIZE) {
+ pte_t pte = mfn_pte(PFN_DOWN(pa), PAGE_KERNEL_IO);
+
+ if (HYPERVISOR_update_va_mapping(PAGE_OFFSET + pa, pte, 0))
+ BUG();
+ }
+
+ xen_flush_tlb();
+}
+
static __init void xen_post_allocator_init(void)
{
pv_mmu_ops.set_pte = xen_set_pte;
@@ -2320,6 +2359,8 @@ void __init xen_init_mmu_ops(void)
pv_mmu_ops = xen_mmu_ops;
vmap_lazy_unmap = false;
+
+ memset(dummy_mapping, 0xff, PAGE_SIZE);
}
/* Protected by xen_reservation_lock. */
diff --git a/arch/x86/xen/pci-swiotlb-xen.c b/arch/x86/xen/pci-swiotlb-xen.c
index 22471001b74..bfd0632fe65 100644
--- a/arch/x86/xen/pci-swiotlb-xen.c
+++ b/arch/x86/xen/pci-swiotlb-xen.c
@@ -1,6 +1,7 @@
/* Glue code to lib/swiotlb-xen.c */
#include <linux/dma-mapping.h>
+#include <linux/pci.h>
#include <xen/swiotlb-xen.h>
#include <asm/xen/hypervisor.h>
@@ -55,6 +56,9 @@ void __init pci_xen_swiotlb_init(void)
if (xen_swiotlb) {
xen_swiotlb_init(1);
dma_ops = &xen_swiotlb_dma_ops;
+
+ /* Make sure ACS will be enabled */
+ pci_request_acs();
}
}
IOMMU_INIT_FINISH(pci_xen_swiotlb_detect,
diff --git a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
index 105db250105..769c4b01fa3 100644
--- a/arch/x86/xen/setup.c
+++ b/arch/x86/xen/setup.c
@@ -118,16 +118,18 @@ static unsigned long __init xen_return_unused_memory(unsigned long max_pfn,
const struct e820map *e820)
{
phys_addr_t max_addr = PFN_PHYS(max_pfn);
- phys_addr_t last_end = 0;
+ phys_addr_t last_end = ISA_END_ADDRESS;
unsigned long released = 0;
int i;
+ /* Free any unused memory above the low 1Mbyte. */
for (i = 0; i < e820->nr_map && last_end < max_addr; i++) {
phys_addr_t end = e820->map[i].addr;
end = min(max_addr, end);
- released += xen_release_chunk(last_end, end);
- last_end = e820->map[i].addr + e820->map[i].size;
+ if (last_end < end)
+ released += xen_release_chunk(last_end, end);
+ last_end = max(last_end, e820->map[i].addr + e820->map[i].size);
}
if (last_end < max_addr)
@@ -164,6 +166,7 @@ char * __init xen_memory_setup(void)
XENMEM_memory_map;
rc = HYPERVISOR_memory_op(op, &memmap);
if (rc == -ENOSYS) {
+ BUG_ON(xen_initial_domain());
memmap.nr_entries = 1;
map[0].addr = 0ULL;
map[0].size = mem_end;
@@ -201,9 +204,13 @@ char * __init xen_memory_setup(void)
}
/*
- * Even though this is normal, usable memory under Xen, reserve
- * ISA memory anyway because too many things think they can poke
+ * In domU, the ISA region is normal, usable memory, but we
+ * reserve ISA memory anyway because too many things poke
* about in there.
+ *
+ * In Dom0, the host E820 information can leave gaps in the
+ * ISA range, which would cause us to release those pages. To
+ * avoid this, we unconditionally reserve them here.
*/
e820_add_region(ISA_START_ADDRESS, ISA_END_ADDRESS - ISA_START_ADDRESS,
E820_RESERVED);
@@ -367,7 +374,5 @@ void __init xen_arch_setup(void)
pm_idle = xen_idle;
- paravirt_disable_iospace();
-
fiddle_vdso();
}
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 25f232b18a8..72a4c795904 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -28,6 +28,7 @@
#include <asm/xen/interface.h>
#include <asm/xen/hypercall.h>
+#include <xen/xen.h>
#include <xen/page.h>
#include <xen/events.h>
@@ -156,11 +157,35 @@ static void __init xen_fill_possible_map(void)
{
int i, rc;
+ if (xen_initial_domain())
+ return;
+
+ for (i = 0; i < nr_cpu_ids; i++) {
+ rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
+ if (rc >= 0) {
+ num_processors++;
+ set_cpu_possible(i, true);
+ }
+ }
+}
+
+static void __init xen_filter_cpu_maps(void)
+{
+ int i, rc;
+
+ if (!xen_initial_domain())
+ return;
+
+ num_processors = 0;
+ disabled_cpus = 0;
for (i = 0; i < nr_cpu_ids; i++) {
rc = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
if (rc >= 0) {
num_processors++;
set_cpu_possible(i, true);
+ } else {
+ set_cpu_possible(i, false);
+ set_cpu_present(i, false);
}
}
}
@@ -174,6 +199,7 @@ static void __init xen_smp_prepare_boot_cpu(void)
old memory can be recycled */
make_lowmem_page_readwrite(xen_initial_gdt);
+ xen_filter_cpu_maps();
xen_setup_vcpu_info_placement();
}
@@ -400,9 +426,9 @@ static void stop_self(void *v)
BUG();
}
-static void xen_smp_send_stop(void)
+static void xen_stop_other_cpus(int wait)
{
- smp_call_function(stop_self, NULL, 0);
+ smp_call_function(stop_self, NULL, wait);
}
static void xen_smp_send_reschedule(int cpu)
@@ -470,7 +496,7 @@ static const struct smp_ops xen_smp_ops __initdata = {
.cpu_disable = xen_cpu_disable,
.play_dead = xen_play_dead,
- .smp_send_stop = xen_smp_send_stop,
+ .stop_other_cpus = xen_stop_other_cpus,
.smp_send_reschedule = xen_smp_send_reschedule,
.send_call_func_ipi = xen_smp_send_call_function_ipi,
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-09-22 00:23:53 +0000