static int __init pvh_setup_vmx_realmode_helpers(struct domain *d)
{
p2m_type_t p2mt;
uint32_t rc, *ident_pt;
mfn_t mfn;
paddr_t gaddr;
struct vcpu *v = d->vcpu[0];
/*
* Steal some space from the last RAM region below 4GB and use it to
* store the real-mode TSS. It needs to be aligned to 128 so that the
* TSS structure (which accounts for the first 104b) doesn't cross
* a page boundary.
*/
if ( !pvh_steal_ram(d, HVM_VM86_TSS_SIZE, 128, GB(4), &gaddr) )
{
if ( hvm_copy_to_guest_phys(gaddr, NULL, HVM_VM86_TSS_SIZE, v) !=
HVMCOPY_okay )
printk("Unable to zero VM86 TSS area\n");
d->arch.hvm_domain.params[HVM_PARAM_VM86_TSS_SIZED] =
VM86_TSS_UPDATED | ((uint64_t)HVM_VM86_TSS_SIZE << 32) | gaddr;
if ( pvh_add_mem_range(d, gaddr, gaddr + HVM_VM86_TSS_SIZE,
E820_RESERVED) )
printk("Unable to set VM86 TSS as reserved in the memory map\n");
}
else
printk("Unable to allocate VM86 TSS area\n");
/* Steal some more RAM for the identity page tables. */
if ( pvh_steal_ram(d, PAGE_SIZE, PAGE_SIZE, GB(4), &gaddr) )
{
printk("Unable to find memory to stash the identity page tables\n");
return -ENOMEM;
}
/*
* Identity-map page table is required for running with CR0.PG=0
* when using Intel EPT. Create a 32-bit non-PAE page directory of
* superpages.
*/
ident_pt = map_domain_gfn(p2m_get_hostp2m(d), _gfn(PFN_DOWN(gaddr)),
&mfn, &p2mt, 0, &rc);
if ( ident_pt == NULL )
{
printk("Unable to map identity page tables\n");
return -ENOMEM;
}
write_32bit_pse_identmap(ident_pt);
unmap_domain_page(ident_pt);
put_page(mfn_to_page(mfn_x(mfn)));
d->arch.hvm_domain.params[HVM_PARAM_IDENT_PT] = gaddr;
if ( pvh_add_mem_range(d, gaddr, gaddr + PAGE_SIZE, E820_RESERVED) )
printk("Unable to set identity page tables as reserved in the memory map\n");
return 0;
}
static int process_portio_intercept(portio_action_t action, ioreq_t *p)
{
int rc = X86EMUL_OKAY, i, sign = p->df ? -1 : 1;
uint32_t data;
if ( !p->data_is_ptr )
{
if ( p->dir == IOREQ_READ )
{
rc = action(IOREQ_READ, p->addr, p->size, &data);
p->data = data;
}
else
{
data = p->data;
rc = action(IOREQ_WRITE, p->addr, p->size, &data);
}
return rc;
}
if ( p->dir == IOREQ_READ )
{
for ( i = 0; i < p->count; i++ )
{
rc = action(IOREQ_READ, p->addr, p->size, &data);
if ( rc != X86EMUL_OKAY )
break;
(void)hvm_copy_to_guest_phys(p->data + sign*i*p->size,
&data, p->size);
}
}
else /* p->dir == IOREQ_WRITE */
{
for ( i = 0; i < p->count; i++ )
{
data = 0;
(void)hvm_copy_from_guest_phys(&data, p->data + sign*i*p->size,
p->size);
rc = action(IOREQ_WRITE, p->addr, p->size, &data);
if ( rc != X86EMUL_OKAY )
break;
}
}
if ( i != 0 )
{
p->count = i;
rc = X86EMUL_OKAY;
}
return rc;
}
static int hvm_mmio_access(struct vcpu *v,
ioreq_t *p,
hvm_mmio_read_t read_handler,
hvm_mmio_write_t write_handler)
{
unsigned long data;
int rc = X86EMUL_OKAY, i, sign = p->df ? -1 : 1;
if ( !p->data_is_ptr )
{
if ( p->dir == IOREQ_READ )
{
rc = read_handler(v, p->addr, p->size, &data);
p->data = data;
}
else /* p->dir == IOREQ_WRITE */
rc = write_handler(v, p->addr, p->size, p->data);
return rc;
}
if ( p->dir == IOREQ_READ )
{
for ( i = 0; i < p->count; i++ )
{
int ret;
rc = read_handler(v, p->addr + (sign * i * p->size), p->size,
&data);
if ( rc != X86EMUL_OKAY )
break;
ret = hvm_copy_to_guest_phys(p->data + (sign * i * p->size),
&data,
p->size);
if ( (ret == HVMCOPY_gfn_paged_out) ||
(ret == HVMCOPY_gfn_shared) )
{
rc = X86EMUL_RETRY;
break;
}
}
}
else
{
for ( i = 0; i < p->count; i++ )
{
switch ( hvm_copy_from_guest_phys(&data,
p->data + sign * i * p->size,
p->size) )
{
case HVMCOPY_okay:
break;
case HVMCOPY_gfn_paged_out:
case HVMCOPY_gfn_shared:
rc = X86EMUL_RETRY;
break;
case HVMCOPY_bad_gfn_to_mfn:
data = ~0;
break;
case HVMCOPY_bad_gva_to_gfn:
ASSERT(0);
/* fall through */
default:
rc = X86EMUL_UNHANDLEABLE;
break;
}
if ( rc != X86EMUL_OKAY )
break;
rc = write_handler(v, p->addr + (sign * i * p->size), p->size,
data);
if ( rc != X86EMUL_OKAY )
break;
}
}
if ( i != 0 )
{
p->count = i;
rc = X86EMUL_OKAY;
}
return rc;
}
static int process_portio_intercept(portio_action_t action, ioreq_t *p)
{
int rc = X86EMUL_OKAY, i, sign = p->df ? -1 : 1;
uint32_t data;
if ( !p->data_is_ptr )
{
if ( p->dir == IOREQ_READ )
{
rc = action(IOREQ_READ, p->addr, p->size, &data);
p->data = data;
}
else
{
data = p->data;
rc = action(IOREQ_WRITE, p->addr, p->size, &data);
}
return rc;
}
if ( p->dir == IOREQ_READ )
{
for ( i = 0; i < p->count; i++ )
{
rc = action(IOREQ_READ, p->addr, p->size, &data);
if ( rc != X86EMUL_OKAY )
break;
(void)hvm_copy_to_guest_phys(p->data + sign*i*p->size,
&data, p->size);
}
}
else /* p->dir == IOREQ_WRITE */
{
for ( i = 0; i < p->count; i++ )
{
data = 0;
switch ( hvm_copy_from_guest_phys(&data,
p->data + sign * i * p->size,
p->size) )
{
case HVMCOPY_okay:
break;
case HVMCOPY_gfn_paged_out:
case HVMCOPY_gfn_shared:
rc = X86EMUL_RETRY;
break;
case HVMCOPY_bad_gfn_to_mfn:
data = ~0;
break;
case HVMCOPY_bad_gva_to_gfn:
ASSERT(0);
/* fall through */
default:
rc = X86EMUL_UNHANDLEABLE;
break;
}
if ( rc != X86EMUL_OKAY )
break;
rc = action(IOREQ_WRITE, p->addr, p->size, &data);
if ( rc != X86EMUL_OKAY )
break;
}
}
if ( i != 0 )
{
p->count = i;
rc = X86EMUL_OKAY;
}
return rc;
}
static int __init pvh_setup_acpi(struct domain *d, paddr_t start_info)
{
unsigned long pfn, nr_pages;
paddr_t madt_paddr, xsdt_paddr, rsdp_paddr;
unsigned int i;
int rc;
struct acpi_table_rsdp *native_rsdp, rsdp = {
.signature = ACPI_SIG_RSDP,
.revision = 2,
.length = sizeof(rsdp),
};
/* Scan top-level tables and add their regions to the guest memory map. */
for( i = 0; i < acpi_gbl_root_table_list.count; i++ )
{
const char *sig = acpi_gbl_root_table_list.tables[i].signature.ascii;
unsigned long addr = acpi_gbl_root_table_list.tables[i].address;
unsigned long size = acpi_gbl_root_table_list.tables[i].length;
/*
* Make sure the original MADT is also mapped, so that Dom0 can
* properly access the data returned by _MAT methods in case it's
* re-using MADT memory.
*/
if ( strncmp(sig, ACPI_SIG_MADT, ACPI_NAME_SIZE)
? pvh_acpi_table_allowed(sig)
: !acpi_memory_banned(addr, size) )
pvh_add_mem_range(d, addr, addr + size, E820_ACPI);
}
/* Identity map ACPI e820 regions. */
for ( i = 0; i < d->arch.nr_e820; i++ )
{
if ( d->arch.e820[i].type != E820_ACPI &&
d->arch.e820[i].type != E820_NVS )
continue;
pfn = PFN_DOWN(d->arch.e820[i].addr);
nr_pages = PFN_UP((d->arch.e820[i].addr & ~PAGE_MASK) +
d->arch.e820[i].size);
rc = modify_identity_mmio(d, pfn, nr_pages, true);
if ( rc )
{
printk("Failed to map ACPI region [%#lx, %#lx) into Dom0 memory map\n",
pfn, pfn + nr_pages);
return rc;
}
}
rc = pvh_setup_acpi_madt(d, &madt_paddr);
if ( rc )
return rc;
rc = pvh_setup_acpi_xsdt(d, madt_paddr, &xsdt_paddr);
if ( rc )
return rc;
/* Craft a custom RSDP. */
native_rsdp = acpi_os_map_memory(acpi_os_get_root_pointer(), sizeof(rsdp));
if ( !native_rsdp )
{
printk("Failed to map native RSDP\n");
return -ENOMEM;
}
memcpy(rsdp.oem_id, native_rsdp->oem_id, sizeof(rsdp.oem_id));
acpi_os_unmap_memory(native_rsdp, sizeof(rsdp));
rsdp.xsdt_physical_address = xsdt_paddr;
/*
* Calling acpi_tb_checksum here is a layering violation, but
* introducing a wrapper for such simple usage seems overkill.
*/
rsdp.checksum -= acpi_tb_checksum(ACPI_CAST_PTR(u8, &rsdp),
ACPI_RSDP_REV0_SIZE);
rsdp.extended_checksum -= acpi_tb_checksum(ACPI_CAST_PTR(u8, &rsdp),
sizeof(rsdp));
/*
* Place the new RSDP in guest memory space.
*
* NB: this RSDP is not going to replace the original RSDP, which should
* still be accessible to the guest. However that RSDP is going to point to
* the native RSDT, and should not be used for the Dom0 kernel's boot
* purposes (we keep it visible for post boot access).
*/
if ( pvh_steal_ram(d, sizeof(rsdp), 0, GB(4), &rsdp_paddr) )
{
printk("Unable to allocate guest RAM for RSDP\n");
return -ENOMEM;
}
/* Mark this region as E820_ACPI. */
if ( pvh_add_mem_range(d, rsdp_paddr, rsdp_paddr + sizeof(rsdp),
E820_ACPI) )
printk("Unable to add RSDP region to memory map\n");
/* Copy RSDP into guest memory. */
rc = hvm_copy_to_guest_phys(rsdp_paddr, &rsdp, sizeof(rsdp), d->vcpu[0]);
if ( rc )
{
printk("Unable to copy RSDP into guest memory\n");
return rc;
}
/* Copy RSDP address to start_info. */
rc = hvm_copy_to_guest_phys(start_info +
offsetof(struct hvm_start_info, rsdp_paddr),
&rsdp_paddr,
sizeof(((struct hvm_start_info *)
0)->rsdp_paddr),
d->vcpu[0]);
if ( rc )
{
printk("Unable to copy RSDP into guest memory\n");
return rc;
}
return 0;
}
int __init dom0_construct_pvh(struct domain *d, const module_t *image,
unsigned long image_headroom,
module_t *initrd,
void *(*bootstrap_map)(const module_t *),
char *cmdline)
{
paddr_t entry, start_info;
int rc;
printk("** Building a PVH Dom0 **\n");
iommu_hwdom_init(d);
rc = pvh_setup_p2m(d);
if ( rc )
{
printk("Failed to setup Dom0 physical memory map\n");
return rc;
}
rc = pvh_load_kernel(d, image, image_headroom, initrd, bootstrap_map(image),
cmdline, &entry, &start_info);
if ( rc )
{
printk("Failed to load Dom0 kernel\n");
return rc;
}
rc = pvh_setup_cpus(d, entry, start_info);
if ( rc )
{
printk("Failed to setup Dom0 CPUs: %d\n", rc);
return rc;
}
rc = pvh_setup_acpi(d, start_info);
if ( rc )
{
printk("Failed to setup Dom0 ACPI tables: %d\n", rc);
return rc;
}
panic("Building a PVHv2 Dom0 is not yet supported.");
return 0;
}
static int __init pvh_setup_acpi_xsdt(struct domain *d, paddr_t madt_addr,
paddr_t *addr)
{
struct acpi_table_xsdt *xsdt;
struct acpi_table_header *table;
struct acpi_table_rsdp *rsdp;
unsigned long size = sizeof(*xsdt);
unsigned int i, j, num_tables = 0;
paddr_t xsdt_paddr;
int rc;
/*
* Restore original DMAR table signature, we are going to filter it from
* the new XSDT that is presented to the guest, so it is no longer
* necessary to have it's signature zapped.
*/
acpi_dmar_reinstate();
/* Count the number of tables that will be added to the XSDT. */
for( i = 0; i < acpi_gbl_root_table_list.count; i++ )
{
const char *sig = acpi_gbl_root_table_list.tables[i].signature.ascii;
if ( pvh_acpi_table_allowed(sig) )
num_tables++;
}
/*
* No need to add or subtract anything because struct acpi_table_xsdt
* includes one array slot already, and we have filtered out the original
* MADT and we are going to add a custom built MADT.
*/
size += num_tables * sizeof(xsdt->table_offset_entry[0]);
xsdt = xzalloc_bytes(size);
if ( !xsdt )
{
printk("Unable to allocate memory for XSDT table\n");
rc = -ENOMEM;
goto out;
}
/* Copy the native XSDT table header. */
rsdp = acpi_os_map_memory(acpi_os_get_root_pointer(), sizeof(*rsdp));
if ( !rsdp )
{
printk("Unable to map RSDP\n");
rc = -EINVAL;
goto out;
}
xsdt_paddr = rsdp->xsdt_physical_address;
acpi_os_unmap_memory(rsdp, sizeof(*rsdp));
table = acpi_os_map_memory(xsdt_paddr, sizeof(*table));
if ( !table )
{
printk("Unable to map XSDT\n");
rc = -EINVAL;
goto out;
}
xsdt->header = *table;
acpi_os_unmap_memory(table, sizeof(*table));
/* Add the custom MADT. */
xsdt->table_offset_entry[0] = madt_addr;
/* Copy the addresses of the rest of the allowed tables. */
for( i = 0, j = 1; i < acpi_gbl_root_table_list.count; i++ )
{
const char *sig = acpi_gbl_root_table_list.tables[i].signature.ascii;
if ( pvh_acpi_table_allowed(sig) )
xsdt->table_offset_entry[j++] =
acpi_gbl_root_table_list.tables[i].address;
}
xsdt->header.revision = 1;
xsdt->header.length = size;
/*
* Calling acpi_tb_checksum here is a layering violation, but
* introducing a wrapper for such simple usage seems overkill.
*/
xsdt->header.checksum -= acpi_tb_checksum(ACPI_CAST_PTR(u8, xsdt), size);
/* Place the new XSDT in guest memory space. */
if ( pvh_steal_ram(d, size, 0, GB(4), addr) )
{
printk("Unable to find guest RAM for XSDT\n");
rc = -ENOMEM;
goto out;
}
/* Mark this region as E820_ACPI. */
if ( pvh_add_mem_range(d, *addr, *addr + size, E820_ACPI) )
printk("Unable to add XSDT region to memory map\n");
rc = hvm_copy_to_guest_phys(*addr, xsdt, size, d->vcpu[0]);
if ( rc )
{
printk("Unable to copy XSDT into guest memory\n");
goto out;
}
rc = 0;
out:
xfree(xsdt);
return rc;
}
static int __init pvh_setup_acpi_madt(struct domain *d, paddr_t *addr)
{
struct acpi_table_madt *madt;
struct acpi_table_header *table;
struct acpi_madt_io_apic *io_apic;
struct acpi_madt_local_x2apic *x2apic;
acpi_status status;
unsigned long size;
unsigned int i, max_vcpus;
int rc;
/* Count number of interrupt overrides in the MADT. */
acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE,
acpi_count_intr_ovr, UINT_MAX);
/* Count number of NMI sources in the MADT. */
acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_count_nmi_src,
UINT_MAX);
max_vcpus = dom0_max_vcpus();
/* Calculate the size of the crafted MADT. */
size = sizeof(*madt);
size += sizeof(*io_apic) * nr_ioapics;
size += sizeof(*intsrcovr) * acpi_intr_overrides;
size += sizeof(*nmisrc) * acpi_nmi_sources;
size += sizeof(*x2apic) * max_vcpus;
madt = xzalloc_bytes(size);
if ( !madt )
{
printk("Unable to allocate memory for MADT table\n");
rc = -ENOMEM;
goto out;
}
/* Copy the native MADT table header. */
status = acpi_get_table(ACPI_SIG_MADT, 0, &table);
if ( !ACPI_SUCCESS(status) )
{
printk("Failed to get MADT ACPI table, aborting.\n");
rc = -EINVAL;
goto out;
}
madt->header = *table;
madt->address = APIC_DEFAULT_PHYS_BASE;
/*
* NB: this is currently set to 4, which is the revision in the ACPI
* spec 6.1. Sadly ACPICA doesn't provide revision numbers for the
* tables described in the headers.
*/
madt->header.revision = min_t(unsigned char, table->revision, 4);
/* Setup the IO APIC entries. */
io_apic = (void *)(madt + 1);
for ( i = 0; i < nr_ioapics; i++ )
{
io_apic->header.type = ACPI_MADT_TYPE_IO_APIC;
io_apic->header.length = sizeof(*io_apic);
io_apic->id = domain_vioapic(d, i)->id;
io_apic->address = domain_vioapic(d, i)->base_address;
io_apic->global_irq_base = domain_vioapic(d, i)->base_gsi;
io_apic++;
}
x2apic = (void *)io_apic;
for ( i = 0; i < max_vcpus; i++ )
{
x2apic->header.type = ACPI_MADT_TYPE_LOCAL_X2APIC;
x2apic->header.length = sizeof(*x2apic);
x2apic->uid = i;
x2apic->local_apic_id = i * 2;
x2apic->lapic_flags = ACPI_MADT_ENABLED;
x2apic++;
}
/* Setup interrupt overrides. */
intsrcovr = (void *)x2apic;
acpi_table_parse_madt(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_set_intr_ovr,
acpi_intr_overrides);
/* Setup NMI sources. */
nmisrc = (void *)intsrcovr;
acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_set_nmi_src,
acpi_nmi_sources);
ASSERT(((void *)nmisrc - (void *)madt) == size);
madt->header.length = size;
/*
* Calling acpi_tb_checksum here is a layering violation, but
* introducing a wrapper for such simple usage seems overkill.
*/
madt->header.checksum -= acpi_tb_checksum(ACPI_CAST_PTR(u8, madt), size);
/* Place the new MADT in guest memory space. */
if ( pvh_steal_ram(d, size, 0, GB(4), addr) )
{
printk("Unable to find allocate guest RAM for MADT\n");
rc = -ENOMEM;
goto out;
}
/* Mark this region as E820_ACPI. */
if ( pvh_add_mem_range(d, *addr, *addr + size, E820_ACPI) )
printk("Unable to add MADT region to memory map\n");
rc = hvm_copy_to_guest_phys(*addr, madt, size, d->vcpu[0]);
if ( rc )
{
printk("Unable to copy MADT into guest memory\n");
goto out;
}
rc = 0;
out:
xfree(madt);
return rc;
}
static int __init pvh_load_kernel(struct domain *d, const module_t *image,
unsigned long image_headroom,
module_t *initrd, void *image_base,
char *cmdline, paddr_t *entry,
paddr_t *start_info_addr)
{
void *image_start = image_base + image_headroom;
unsigned long image_len = image->mod_end;
struct elf_binary elf;
struct elf_dom_parms parms;
paddr_t last_addr;
struct hvm_start_info start_info = { 0 };
struct hvm_modlist_entry mod = { 0 };
struct vcpu *v = d->vcpu[0];
int rc;
if ( (rc = bzimage_parse(image_base, &image_start, &image_len)) != 0 )
{
printk("Error trying to detect bz compressed kernel\n");
return rc;
}
if ( (rc = elf_init(&elf, image_start, image_len)) != 0 )
{
printk("Unable to init ELF\n");
return rc;
}
#ifdef VERBOSE
elf_set_verbose(&elf);
#endif
elf_parse_binary(&elf);
if ( (rc = elf_xen_parse(&elf, &parms)) != 0 )
{
printk("Unable to parse kernel for ELFNOTES\n");
return rc;
}
if ( parms.phys_entry == UNSET_ADDR32 )
{
printk("Unable to find XEN_ELFNOTE_PHYS32_ENTRY address\n");
return -EINVAL;
}
printk("OS: %s version: %s loader: %s bitness: %s\n", parms.guest_os,
parms.guest_ver, parms.loader,
elf_64bit(&elf) ? "64-bit" : "32-bit");
/* Copy the OS image and free temporary buffer. */
elf.dest_base = (void *)(parms.virt_kstart - parms.virt_base);
elf.dest_size = parms.virt_kend - parms.virt_kstart;
elf_set_vcpu(&elf, v);
rc = elf_load_binary(&elf);
if ( rc < 0 )
{
printk("Failed to load kernel: %d\n", rc);
printk("Xen dom0 kernel broken ELF: %s\n", elf_check_broken(&elf));
return rc;
}
last_addr = ROUNDUP(parms.virt_kend - parms.virt_base, PAGE_SIZE);
if ( initrd != NULL )
{
rc = hvm_copy_to_guest_phys(last_addr, mfn_to_virt(initrd->mod_start),
initrd->mod_end, v);
if ( rc )
{
printk("Unable to copy initrd to guest\n");
return rc;
}
mod.paddr = last_addr;
mod.size = initrd->mod_end;
last_addr += ROUNDUP(initrd->mod_end, PAGE_SIZE);
}
/* Free temporary buffers. */
discard_initial_images();
if ( cmdline != NULL )
{
rc = hvm_copy_to_guest_phys(last_addr, cmdline, strlen(cmdline) + 1, v);
if ( rc )
{
printk("Unable to copy guest command line\n");
return rc;
}
start_info.cmdline_paddr = last_addr;
/*
* Round up to 32/64 bits (depending on the guest kernel bitness) so
* the modlist/start_info is aligned.
*/
last_addr += ROUNDUP(strlen(cmdline) + 1, elf_64bit(&elf) ? 8 : 4);
}
if ( initrd != NULL )
{
rc = hvm_copy_to_guest_phys(last_addr, &mod, sizeof(mod), v);
if ( rc )
{
printk("Unable to copy guest modules\n");
return rc;
}
start_info.modlist_paddr = last_addr;
start_info.nr_modules = 1;
last_addr += sizeof(mod);
}
start_info.magic = XEN_HVM_START_MAGIC_VALUE;
start_info.flags = SIF_PRIVILEGED | SIF_INITDOMAIN;
rc = hvm_copy_to_guest_phys(last_addr, &start_info, sizeof(start_info), v);
if ( rc )
{
printk("Unable to copy start info to guest\n");
return rc;
}
*entry = parms.phys_entry;
*start_info_addr = last_addr;
return 0;
}
static void realmode_deliver_exception(
unsigned int vector,
unsigned int insn_len,
struct hvm_emulate_ctxt *hvmemul_ctxt)
{
struct segment_register *idtr, *csr;
struct cpu_user_regs *regs = hvmemul_ctxt->ctxt.regs;
uint32_t cs_eip, pstk;
uint16_t frame[3];
unsigned int last_byte;
idtr = hvmemul_get_seg_reg(x86_seg_idtr, hvmemul_ctxt);
csr = hvmemul_get_seg_reg(x86_seg_cs, hvmemul_ctxt);
__set_bit(x86_seg_cs, &hvmemul_ctxt->seg_reg_dirty);
again:
last_byte = (vector * 4) + 3;
if ( idtr->limit < last_byte ||
hvm_copy_from_guest_phys(&cs_eip, idtr->base + vector * 4, 4) !=
HVMCOPY_okay )
{
/* Software interrupt? */
if ( insn_len != 0 )
{
insn_len = 0;
vector = TRAP_gp_fault;
goto again;
}
/* Exception or hardware interrupt. */
switch ( vector )
{
case TRAP_double_fault:
hvm_triple_fault();
return;
case TRAP_gp_fault:
vector = TRAP_double_fault;
goto again;
default:
vector = TRAP_gp_fault;
goto again;
}
}
frame[0] = regs->eip + insn_len;
frame[1] = csr->sel;
frame[2] = regs->eflags & ~X86_EFLAGS_RF;
/* We can't test hvmemul_ctxt->ctxt.sp_size: it may not be initialised. */
if ( hvmemul_ctxt->seg_reg[x86_seg_ss].attr.fields.db )
{
regs->esp -= 6;
pstk = regs->esp;
}
else
{
pstk = (uint16_t)(regs->esp - 6);
regs->esp &= ~0xffff;
regs->esp |= pstk;
}
pstk += hvmemul_get_seg_reg(x86_seg_ss, hvmemul_ctxt)->base;
(void)hvm_copy_to_guest_phys(pstk, frame, sizeof(frame));
csr->sel = cs_eip >> 16;
csr->base = (uint32_t)csr->sel << 4;
regs->eip = (uint16_t)cs_eip;
regs->eflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_IF | X86_EFLAGS_RF);
/* Exception delivery clears STI and MOV-SS blocking. */
if ( hvmemul_ctxt->intr_shadow &
(VMX_INTR_SHADOW_STI|VMX_INTR_SHADOW_MOV_SS) )
{
hvmemul_ctxt->intr_shadow &=
~(VMX_INTR_SHADOW_STI|VMX_INTR_SHADOW_MOV_SS);
__vmwrite(GUEST_INTERRUPTIBILITY_INFO, hvmemul_ctxt->intr_shadow);
}
}
static int hvm_mmio_access(struct vcpu *v,
ioreq_t *p,
hvm_mmio_read_t read_handler,
hvm_mmio_write_t write_handler)
{
unsigned long data;
int rc = X86EMUL_OKAY, i, sign = p->df ? -1 : 1;
if ( !p->data_is_ptr )
{
if ( p->dir == IOREQ_READ )
{
rc = read_handler(v, p->addr, p->size, &data);
p->data = data;
}
else /* p->dir == IOREQ_WRITE */
rc = write_handler(v, p->addr, p->size, p->data);
return rc;
}
if ( p->dir == IOREQ_READ )
{
for ( i = 0; i < p->count; i++ )
{
int ret;
rc = read_handler(v, p->addr + (sign * i * p->size), p->size,
&data);
if ( rc != X86EMUL_OKAY )
break;
ret = hvm_copy_to_guest_phys(p->data + (sign * i * p->size),
&data,
p->size);
if ( (ret == HVMCOPY_gfn_paged_out) ||
(ret == HVMCOPY_gfn_shared) )
{
rc = X86EMUL_RETRY;
break;
}
}
}
else
{
for ( i = 0; i < p->count; i++ )
{
int ret;
ret = hvm_copy_from_guest_phys(&data,
p->data + (sign * i * p->size),
p->size);
if ( (ret == HVMCOPY_gfn_paged_out) ||
(ret == HVMCOPY_gfn_shared) )
{
rc = X86EMUL_RETRY;
break;
}
rc = write_handler(v, p->addr + (sign * i * p->size), p->size,
data);
if ( rc != X86EMUL_OKAY )
break;
}
}
if ( i != 0 )
{
p->count = i;
rc = X86EMUL_OKAY;
}
return rc;
}
int wrmsr_viridian_regs(uint32_t idx, uint64_t val)
{
struct domain *d = current->domain;
if ( !is_viridian_domain(d) )
return 0;
switch ( idx )
{
case VIRIDIAN_MSR_GUEST_OS_ID:
perfc_incr(mshv_wrmsr_osid);
d->arch.hvm_domain.viridian.guest_os_id.raw = val;
gdprintk(XENLOG_INFO, "Guest os:\n");
gdprintk(XENLOG_INFO, "\tvendor: %x\n",
d->arch.hvm_domain.viridian.guest_os_id.fields.vendor);
gdprintk(XENLOG_INFO, "\tos: %x\n",
d->arch.hvm_domain.viridian.guest_os_id.fields.os);
gdprintk(XENLOG_INFO, "\tmajor: %x\n",
d->arch.hvm_domain.viridian.guest_os_id.fields.major);
gdprintk(XENLOG_INFO, "\tminor: %x\n",
d->arch.hvm_domain.viridian.guest_os_id.fields.minor);
gdprintk(XENLOG_INFO, "\tsp: %x\n",
d->arch.hvm_domain.viridian.guest_os_id.fields.service_pack);
gdprintk(XENLOG_INFO, "\tbuild: %x\n",
d->arch.hvm_domain.viridian.guest_os_id.fields.build_number);
break;
case VIRIDIAN_MSR_HYPERCALL:
perfc_incr(mshv_wrmsr_hc_page);
gdprintk(XENLOG_INFO, "Set hypercall page %"PRIx64".\n", val);
if ( d->arch.hvm_domain.viridian.guest_os_id.raw == 0 )
break;
d->arch.hvm_domain.viridian.hypercall_gpa.raw = val;
if ( d->arch.hvm_domain.viridian.hypercall_gpa.fields.enabled )
enable_hypercall_page();
break;
case VIRIDIAN_MSR_VP_INDEX:
perfc_incr(mshv_wrmsr_vp_index);
gdprintk(XENLOG_INFO, "Set VP index %"PRIu64".\n", val);
break;
case VIRIDIAN_MSR_EOI:
perfc_incr(mshv_wrmsr_eoi);
vlapic_EOI_set(vcpu_vlapic(current));
break;
case VIRIDIAN_MSR_ICR: {
u32 eax = (u32)val, edx = (u32)(val >> 32);
struct vlapic *vlapic = vcpu_vlapic(current);
perfc_incr(mshv_wrmsr_icr);
eax &= ~(1 << 12);
edx &= 0xff000000;
vlapic_set_reg(vlapic, APIC_ICR2, edx);
if ( vlapic_ipi(vlapic, eax, edx) == X86EMUL_OKAY )
vlapic_set_reg(vlapic, APIC_ICR, eax);
break;
}
case VIRIDIAN_MSR_TPR:
perfc_incr(mshv_wrmsr_tpr);
vlapic_set_reg(vcpu_vlapic(current), APIC_TASKPRI, (uint8_t)val);
break;
case VIRIDIAN_MSR_APIC_ASSIST:
/*
* We don't support the APIC assist page, and that fact is reflected in
* our CPUID flags. However, Windows 7 build 7000 has a bug which means
* that it doesn't recognise that, and tries to use the page anyway. We
* therefore have to fake up just enough to keep win7 happy.
* Fortunately, that's really easy: just setting the first four bytes
* in the page to zero effectively disables the page again, so that's
* what we do. Semantically, the first four bytes are supposed to be a
* flag saying whether the guest really needs to issue an EOI. Setting
* that flag to zero means that it must always issue one, which is what
* we want. Once a page has been repurposed as an APIC assist page the
* guest isn't allowed to set anything in it, so the flag remains zero
* and all is fine. The guest is allowed to clear flags in the page,
* but that doesn't cause us any problems.
*/
if ( val & 1 ) /* APIC assist page enabled? */
{
uint32_t word = 0;
paddr_t page_start = val & ~1ul;
(void)hvm_copy_to_guest_phys(page_start, &word, sizeof(word));
}
break;
default:
return 0;
}
return 1;
}
int hvm_process_io_intercept(const struct hvm_io_handler *handler,
ioreq_t *p)
{
const struct hvm_io_ops *ops = handler->ops;
int rc = X86EMUL_OKAY, i, step = p->df ? -p->size : p->size;
uint64_t data;
uint64_t addr;
if ( p->dir == IOREQ_READ )
{
for ( i = 0; i < p->count; i++ )
{
addr = (p->type == IOREQ_TYPE_COPY) ?
p->addr + step * i :
p->addr;
rc = ops->read(handler, addr, p->size, &data);
if ( rc != X86EMUL_OKAY )
break;
if ( p->data_is_ptr )
{
switch ( hvm_copy_to_guest_phys(p->data + step * i,
&data, p->size) )
{
case HVMCOPY_okay:
break;
case HVMCOPY_bad_gfn_to_mfn:
/* Drop the write as real hardware would. */
continue;
case HVMCOPY_bad_gva_to_gfn:
case HVMCOPY_gfn_paged_out:
case HVMCOPY_gfn_shared:
ASSERT_UNREACHABLE();
/* fall through */
default:
domain_crash(current->domain);
return X86EMUL_UNHANDLEABLE;
}
}
else
p->data = data;
}
}
else /* p->dir == IOREQ_WRITE */
{
for ( i = 0; i < p->count; i++ )
{
if ( p->data_is_ptr )
{
switch ( hvm_copy_from_guest_phys(&data, p->data + step * i,
p->size) )
{
case HVMCOPY_okay:
break;
case HVMCOPY_bad_gfn_to_mfn:
data = ~0;
break;
case HVMCOPY_bad_gva_to_gfn:
case HVMCOPY_gfn_paged_out:
case HVMCOPY_gfn_shared:
ASSERT_UNREACHABLE();
/* fall through */
default:
domain_crash(current->domain);
return X86EMUL_UNHANDLEABLE;
}
}
else
data = p->data;
addr = (p->type == IOREQ_TYPE_COPY) ?
p->addr + step * i :
p->addr;
rc = ops->write(handler, addr, p->size, data);
if ( rc != X86EMUL_OKAY )
break;
}
}
if ( i )
{
p->count = i;
rc = X86EMUL_OKAY;
}
else if ( rc == X86EMUL_UNHANDLEABLE )
{
/*
* Don't forward entire batches to the device model: This would
* prevent the internal handlers to see subsequent iterations of
* the request.
*/
p->count = 1;
}
return rc;
}
static int hvm_mmio_access(struct vcpu *v,
ioreq_t *p,
hvm_mmio_read_t read_handler,
hvm_mmio_write_t write_handler)
{
struct hvm_vcpu_io *vio = &v->arch.hvm_vcpu.hvm_io;
unsigned long data;
int rc = X86EMUL_OKAY, i, step = p->df ? -p->size : p->size;
if ( !p->data_is_ptr )
{
if ( p->dir == IOREQ_READ )
{
if ( vio->mmio_retrying )
{
if ( vio->mmio_large_read_bytes != p->size )
return X86EMUL_UNHANDLEABLE;
memcpy(&data, vio->mmio_large_read, p->size);
vio->mmio_large_read_bytes = 0;
vio->mmio_retrying = 0;
}
else
rc = read_handler(v, p->addr, p->size, &data);
p->data = data;
}
else /* p->dir == IOREQ_WRITE */
rc = write_handler(v, p->addr, p->size, p->data);
return rc;
}
if ( p->dir == IOREQ_READ )
{
for ( i = 0; i < p->count; i++ )
{
if ( vio->mmio_retrying )
{
if ( vio->mmio_large_read_bytes != p->size )
return X86EMUL_UNHANDLEABLE;
memcpy(&data, vio->mmio_large_read, p->size);
vio->mmio_large_read_bytes = 0;
vio->mmio_retrying = 0;
}
else
{
rc = read_handler(v, p->addr + step * i, p->size, &data);
if ( rc != X86EMUL_OKAY )
break;
}
switch ( hvm_copy_to_guest_phys(p->data + step * i,
&data, p->size) )
{
case HVMCOPY_okay:
break;
case HVMCOPY_gfn_paged_out:
case HVMCOPY_gfn_shared:
rc = X86EMUL_RETRY;
break;
case HVMCOPY_bad_gfn_to_mfn:
/* Drop the write as real hardware would. */
continue;
case HVMCOPY_bad_gva_to_gfn:
ASSERT(0);
/* fall through */
default:
rc = X86EMUL_UNHANDLEABLE;
break;
}
if ( rc != X86EMUL_OKAY)
break;
}
if ( rc == X86EMUL_RETRY )
{
vio->mmio_retry = 1;
vio->mmio_large_read_bytes = p->size;
memcpy(vio->mmio_large_read, &data, p->size);
}
}
else
{
for ( i = 0; i < p->count; i++ )
{
switch ( hvm_copy_from_guest_phys(&data, p->data + step * i,
p->size) )
{
case HVMCOPY_okay:
break;
case HVMCOPY_gfn_paged_out:
case HVMCOPY_gfn_shared:
rc = X86EMUL_RETRY;
break;
case HVMCOPY_bad_gfn_to_mfn:
data = ~0;
break;
case HVMCOPY_bad_gva_to_gfn:
ASSERT(0);
/* fall through */
default:
rc = X86EMUL_UNHANDLEABLE;
break;
}
if ( rc != X86EMUL_OKAY )
break;
rc = write_handler(v, p->addr + step * i, p->size, data);
if ( rc != X86EMUL_OKAY )
break;
}
if ( rc == X86EMUL_RETRY )
vio->mmio_retry = 1;
}
if ( i != 0 )
{
p->count = i;
rc = X86EMUL_OKAY;
}
return rc;
}
static int process_portio_intercept(portio_action_t action, ioreq_t *p)
{
struct hvm_vcpu_io *vio = ¤t->arch.hvm_vcpu.hvm_io;
int rc = X86EMUL_OKAY, i, step = p->df ? -p->size : p->size;
uint32_t data;
if ( !p->data_is_ptr )
{
if ( p->dir == IOREQ_READ )
{
if ( vio->mmio_retrying )
{
if ( vio->mmio_large_read_bytes != p->size )
return X86EMUL_UNHANDLEABLE;
memcpy(&data, vio->mmio_large_read, p->size);
vio->mmio_large_read_bytes = 0;
vio->mmio_retrying = 0;
}
else
rc = action(IOREQ_READ, p->addr, p->size, &data);
p->data = data;
}
else
{
data = p->data;
rc = action(IOREQ_WRITE, p->addr, p->size, &data);
}
return rc;
}
if ( p->dir == IOREQ_READ )
{
for ( i = 0; i < p->count; i++ )
{
if ( vio->mmio_retrying )
{
if ( vio->mmio_large_read_bytes != p->size )
return X86EMUL_UNHANDLEABLE;
memcpy(&data, vio->mmio_large_read, p->size);
vio->mmio_large_read_bytes = 0;
vio->mmio_retrying = 0;
}
else
{
rc = action(IOREQ_READ, p->addr, p->size, &data);
if ( rc != X86EMUL_OKAY )
break;
}
switch ( hvm_copy_to_guest_phys(p->data + step * i,
&data, p->size) )
{
case HVMCOPY_okay:
break;
case HVMCOPY_gfn_paged_out:
case HVMCOPY_gfn_shared:
rc = X86EMUL_RETRY;
break;
case HVMCOPY_bad_gfn_to_mfn:
/* Drop the write as real hardware would. */
continue;
case HVMCOPY_bad_gva_to_gfn:
ASSERT(0);
/* fall through */
default:
rc = X86EMUL_UNHANDLEABLE;
break;
}
if ( rc != X86EMUL_OKAY)
break;
}
if ( rc == X86EMUL_RETRY )
{
vio->mmio_retry = 1;
vio->mmio_large_read_bytes = p->size;
memcpy(vio->mmio_large_read, &data, p->size);
}
}
else /* p->dir == IOREQ_WRITE */
{
for ( i = 0; i < p->count; i++ )
{
data = 0;
switch ( hvm_copy_from_guest_phys(&data, p->data + step * i,
p->size) )
{
case HVMCOPY_okay:
break;
case HVMCOPY_gfn_paged_out:
case HVMCOPY_gfn_shared:
rc = X86EMUL_RETRY;
break;
case HVMCOPY_bad_gfn_to_mfn:
data = ~0;
break;
case HVMCOPY_bad_gva_to_gfn:
ASSERT(0);
/* fall through */
default:
rc = X86EMUL_UNHANDLEABLE;
break;
}
if ( rc != X86EMUL_OKAY )
break;
rc = action(IOREQ_WRITE, p->addr, p->size, &data);
if ( rc != X86EMUL_OKAY )
break;
}
if ( rc == X86EMUL_RETRY )
vio->mmio_retry = 1;
}
if ( i != 0 )
{
p->count = i;
rc = X86EMUL_OKAY;
}
return rc;
}
static inline void hvm_mmio_access(struct vcpu *v,
ioreq_t *p,
hvm_mmio_read_t read_handler,
hvm_mmio_write_t write_handler)
{
unsigned int tmp1, tmp2;
unsigned long data;
switch ( p->type ) {
case IOREQ_TYPE_COPY:
{
if ( !p->data_is_ptr ) {
if ( p->dir == IOREQ_READ )
p->data = read_handler(v, p->addr, p->size);
else /* p->dir == IOREQ_WRITE */
write_handler(v, p->addr, p->size, p->data);
} else { /* p->data_is_ptr */
int i, sign = (p->df) ? -1 : 1;
if ( p->dir == IOREQ_READ ) {
for ( i = 0; i < p->count; i++ ) {
data = read_handler(v,
p->addr + (sign * i * p->size),
p->size);
(void)hvm_copy_to_guest_phys(
p->data + (sign * i * p->size),
&data,
p->size);
}
} else {/* p->dir == IOREQ_WRITE */
for ( i = 0; i < p->count; i++ ) {
(void)hvm_copy_from_guest_phys(
&data,
p->data + (sign * i * p->size),
p->size);
write_handler(v,
p->addr + (sign * i * p->size),
p->size, data);
}
}
}
break;
}
case IOREQ_TYPE_AND:
tmp1 = read_handler(v, p->addr, p->size);
if ( p->dir == IOREQ_WRITE ) {
tmp2 = tmp1 & (unsigned long) p->data;
write_handler(v, p->addr, p->size, tmp2);
}
p->data = tmp1;
break;
case IOREQ_TYPE_ADD:
tmp1 = read_handler(v, p->addr, p->size);
if (p->dir == IOREQ_WRITE) {
tmp2 = tmp1 + (unsigned long) p->data;
write_handler(v, p->addr, p->size, tmp2);
}
p->data = tmp1;
break;
case IOREQ_TYPE_OR:
tmp1 = read_handler(v, p->addr, p->size);
if ( p->dir == IOREQ_WRITE ) {
tmp2 = tmp1 | (unsigned long) p->data;
write_handler(v, p->addr, p->size, tmp2);
}
p->data = tmp1;
break;
case IOREQ_TYPE_XOR:
tmp1 = read_handler(v, p->addr, p->size);
if ( p->dir == IOREQ_WRITE ) {
tmp2 = tmp1 ^ (unsigned long) p->data;
write_handler(v, p->addr, p->size, tmp2);
}
p->data = tmp1;
break;
case IOREQ_TYPE_XCHG:
/*
* Note that we don't need to be atomic here since VCPU is accessing
* its own local APIC.
*/
tmp1 = read_handler(v, p->addr, p->size);
write_handler(v, p->addr, p->size, (unsigned long) p->data);
p->data = tmp1;
break;
case IOREQ_TYPE_SUB:
tmp1 = read_handler(v, p->addr, p->size);
if ( p->dir == IOREQ_WRITE ) {
tmp2 = tmp1 - (unsigned long) p->data;
write_handler(v, p->addr, p->size, tmp2);
}
p->data = tmp1;
break;
default:
printk("hvm_mmio_access: error ioreq type %x\n", p->type);
domain_crash_synchronous();
break;
}
}
