cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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uv.c (2423B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <asm/uv.h>
      3#include <asm/boot_data.h>
      4#include <asm/facility.h>
      5#include <asm/sections.h>
      6
      7#include "boot.h"
      8#include "uv.h"
      9
     10/* will be used in arch/s390/kernel/uv.c */
     11#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
     12int __bootdata_preserved(prot_virt_guest);
     13#endif
     14#if IS_ENABLED(CONFIG_KVM)
     15int __bootdata_preserved(prot_virt_host);
     16#endif
     17struct uv_info __bootdata_preserved(uv_info);
     18
     19void uv_query_info(void)
     20{
     21	struct uv_cb_qui uvcb = {
     22		.header.cmd = UVC_CMD_QUI,
     23		.header.len = sizeof(uvcb)
     24	};
     25
     26	if (!test_facility(158))
     27		return;
     28
     29	/* rc==0x100 means that there is additional data we do not process */
     30	if (uv_call(0, (uint64_t)&uvcb) && uvcb.header.rc != 0x100)
     31		return;
     32
     33	if (IS_ENABLED(CONFIG_KVM)) {
     34		memcpy(uv_info.inst_calls_list, uvcb.inst_calls_list, sizeof(uv_info.inst_calls_list));
     35		uv_info.uv_base_stor_len = uvcb.uv_base_stor_len;
     36		uv_info.guest_base_stor_len = uvcb.conf_base_phys_stor_len;
     37		uv_info.guest_virt_base_stor_len = uvcb.conf_base_virt_stor_len;
     38		uv_info.guest_virt_var_stor_len = uvcb.conf_virt_var_stor_len;
     39		uv_info.guest_cpu_stor_len = uvcb.cpu_stor_len;
     40		uv_info.max_sec_stor_addr = ALIGN(uvcb.max_guest_stor_addr, PAGE_SIZE);
     41		uv_info.max_num_sec_conf = uvcb.max_num_sec_conf;
     42		uv_info.max_guest_cpu_id = uvcb.max_guest_cpu_id;
     43		uv_info.uv_feature_indications = uvcb.uv_feature_indications;
     44	}
     45
     46#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
     47	if (test_bit_inv(BIT_UVC_CMD_SET_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list) &&
     48	    test_bit_inv(BIT_UVC_CMD_REMOVE_SHARED_ACCESS, (unsigned long *)uvcb.inst_calls_list))
     49		prot_virt_guest = 1;
     50#endif
     51}
     52
     53#if IS_ENABLED(CONFIG_KVM)
     54void adjust_to_uv_max(unsigned long *vmax)
     55{
     56	if (is_prot_virt_host() && uv_info.max_sec_stor_addr)
     57		*vmax = min_t(unsigned long, *vmax, uv_info.max_sec_stor_addr);
     58}
     59
     60static int is_prot_virt_host_capable(void)
     61{
     62	/* disable if no prot_virt=1 given on command-line */
     63	if (!is_prot_virt_host())
     64		return 0;
     65	/* disable if protected guest virtualization is enabled */
     66	if (is_prot_virt_guest())
     67		return 0;
     68	/* disable if no hardware support */
     69	if (!test_facility(158))
     70		return 0;
     71	/* disable if kdump */
     72	if (oldmem_data.start)
     73		return 0;
     74	/* disable if stand-alone dump */
     75	if (ipl_block_valid && is_ipl_block_dump())
     76		return 0;
     77	return 1;
     78}
     79
     80void sanitize_prot_virt_host(void)
     81{
     82	prot_virt_host = is_prot_virt_host_capable();
     83}
     84#endif