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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 09:50:04 +00:00
e9e7870f90
The new boot data struct shall replace global variables OLDMEM_BASE and OLDMEM_SIZE. It is initialized in the decompressor and passed to the decompressed kernel. In comparison to the old solution, this one doesn't access data at fixed physical addresses which will become important when the decompressor becomes relocatable. Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com> Acked-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <asm/uv.h>
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#include <asm/boot_data.h>
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#include <asm/facility.h>
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#include <asm/sections.h>
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#include "boot.h"
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#include "uv.h"
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/* will be used in arch/s390/kernel/uv.c */
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#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
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int __bootdata_preserved(prot_virt_guest);
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#endif
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#if IS_ENABLED(CONFIG_KVM)
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int __bootdata_preserved(prot_virt_host);
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#endif
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struct uv_info __bootdata_preserved(uv_info);
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void uv_query_info(void)
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{
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struct uv_cb_qui uvcb = {
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.header.cmd = UVC_CMD_QUI,
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.header.len = sizeof(uvcb)
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};
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if (!test_facility(158))
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return;
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/* rc==0x100 means that there is additional data we do not process */
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if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != 0x100)
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return;
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if (IS_ENABLED(CONFIG_KVM)) {
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memcpy(uv_info.inst_calls_list, uvcb.inst_calls_list, sizeof(uv_info.inst_calls_list));
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uv_info.uv_base_stor_len = uvcb.uv_base_stor_len;
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uv_info.guest_base_stor_len = uvcb.conf_base_phys_stor_len;
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uv_info.guest_virt_base_stor_len = uvcb.conf_base_virt_stor_len;
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uv_info.guest_virt_var_stor_len = uvcb.conf_virt_var_stor_len;
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uv_info.guest_cpu_stor_len = uvcb.cpu_stor_len;
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uv_info.max_sec_stor_addr = ALIGN(uvcb.max_guest_stor_addr, PAGE_SIZE);
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uv_info.max_num_sec_conf = uvcb.max_num_sec_conf;
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uv_info.max_guest_cpu_id = uvcb.max_guest_cpu_id;
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uv_info.uv_feature_indications = uvcb.uv_feature_indications;
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}
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#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
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if (test_bit_inv(BIT_UVC_CMD_SET_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list) &&
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test_bit_inv(BIT_UVC_CMD_REMOVE_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list))
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prot_virt_guest = 1;
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#endif
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}
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#if IS_ENABLED(CONFIG_KVM)
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void adjust_to_uv_max(unsigned long *vmax)
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{
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if (is_prot_virt_host() && uv_info.max_sec_stor_addr)
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*vmax = min_t(unsigned long, *vmax, uv_info.max_sec_stor_addr);
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}
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static int is_prot_virt_host_capable(void)
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{
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/* disable if no prot_virt=1 given on command-line */
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if (!is_prot_virt_host())
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return 0;
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/* disable if protected guest virtualization is enabled */
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if (is_prot_virt_guest())
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return 0;
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/* disable if no hardware support */
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if (!test_facility(158))
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return 0;
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/* disable if kdump */
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if (oldmem_data.start)
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return 0;
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/* disable if stand-alone dump */
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if (ipl_block_valid && is_ipl_block_dump())
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return 0;
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return 1;
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}
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void sanitize_prot_virt_host(void)
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{
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prot_virt_host = is_prot_virt_host_capable();
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}
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#endif
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