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efi: xen: Set EFI_PARAVIRT for Xen dom0 boot on all architectures 

Currently, the EFI_PARAVIRT flag is only used by Xen dom0 boot on x86,
even though other architectures also support pseudo-EFI boot, where the
core kernel is invoked directly and provided with a set of data tables
that resemble the ones constructed by the EFI stub, which never actually
runs in that case.

Let's fix this inconsistency, and always set this flag when booting dom0
via the EFI boot path. Note that Xen on x86 does not provide the EFI
memory map in this case, whereas other architectures do, so move the
associated EFI_PARAVIRT check into the x86 platform code.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Ard Biesheuvel 2022-10-01 17:17:36 +02:00
parent fdc6d38d64
commit d85e3e3494
4 changed files with 12 additions and 6 deletions
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8
arch/x86/platform/efi/efi.c
View File

@ -214,9 +214,11 @@ int __init efi_memblock_x86_reserve_range(void)
data.desc_size = e->efi_memdesc_size;
data.desc_version = e->efi_memdesc_version;
rv = efi_memmap_init_early(&data);
if (rv)
return rv;
if (!efi_enabled(EFI_PARAVIRT)) {
rv = efi_memmap_init_early(&data);
if (rv)
return rv;
}
if (add_efi_memmap || do_efi_soft_reserve())
do_add_efi_memmap();

3
arch/x86/platform/efi/memmap.c
View File

@ -94,6 +94,9 @@ int __init efi_memmap_install(struct efi_memory_map_data *data)
{
efi_memmap_unmap();
if (efi_enabled(EFI_PARAVIRT))
return 0;
return __efi_memmap_init(data);
}

4
drivers/firmware/efi/fdtparams.c
View File

@ -30,11 +30,13 @@ static __initconst const char name[][22] = {
static __initconst const struct {
const char path[17];
u8 paravirt;
const char params[PARAMCOUNT][26];
} dt_params[] = {
{
#ifdef CONFIG_XEN // <-------17------>
.path = "/hypervisor/uefi",
.paravirt = 1,
.params = {
[SYSTAB] = "xen,uefi-system-table",
[MMBASE] = "xen,uefi-mmap-start",
@ -121,6 +123,8 @@ u64 __init efi_get_fdt_params(struct efi_memory_map_data *mm)
pr_err("Can't find property '%s' in DT!\n", pname);
return 0;
}
if (dt_params[i].paravirt)
set_bit(EFI_PARAVIRT, &efi.flags);
return systab;
}
notfound:

3
drivers/firmware/efi/memmap.c
View File

@ -39,9 +39,6 @@ int __init __efi_memmap_init(struct efi_memory_map_data *data)
struct efi_memory_map map;
phys_addr_t phys_map;
if (efi_enabled(EFI_PARAVIRT))
return 0;
phys_map = data->phys_map;
if (data->flags & EFI_MEMMAP_LATE)