xstate.c (0ea5c948cb64bab5bc7a5516774eb8536f05aa0d) xstate.c (10e4b5166df9ff7a2d5316138ca668b42d004422)
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * xsave/xrstor support.
4 *
5 * Author: Suresh Siddha <suresh.b.siddha@intel.com>
6 */
7#include <linux/bitops.h>
8#include <linux/compat.h>

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173 return;
174
175 cr4_set_bits(X86_CR4_OSXSAVE);
176
177 /*
178 * Must happen after CR4 setup and before xsetbv() to allow KVM
179 * lazy passthrough. Write independent of the dynamic state static
180 * key as that does not work on the boot CPU. This also ensures
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * xsave/xrstor support.
4 *
5 * Author: Suresh Siddha <suresh.b.siddha@intel.com>
6 */
7#include <linux/bitops.h>
8#include <linux/compat.h>

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173 return;
174
175 cr4_set_bits(X86_CR4_OSXSAVE);
176
177 /*
178 * Must happen after CR4 setup and before xsetbv() to allow KVM
179 * lazy passthrough. Write independent of the dynamic state static
180 * key as that does not work on the boot CPU. This also ensures
181 * that any stale state is wiped out from XFD.
181 * that any stale state is wiped out from XFD. Reset the per CPU
182 * xfd cache too.
182 */
183 if (cpu_feature_enabled(X86_FEATURE_XFD))
183 */
184 if (cpu_feature_enabled(X86_FEATURE_XFD))
184 wrmsrl(MSR_IA32_XFD, init_fpstate.xfd);
185 xfd_set_state(init_fpstate.xfd);
185
186 /*
187 * XCR_XFEATURE_ENABLED_MASK (aka. XCR0) sets user features
188 * managed by XSAVE{C, OPT, S} and XRSTOR{S}. Only XSAVE user
189 * states can be set here.
190 */
191 xsetbv(XCR_XFEATURE_ENABLED_MASK, fpu_user_cfg.max_features);
192

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187 /*
188 * XCR_XFEATURE_ENABLED_MASK (aka. XCR0) sets user features
189 * managed by XSAVE{C, OPT, S} and XRSTOR{S}. Only XSAVE user
190 * states can be set here.
191 */
192 xsetbv(XCR_XFEATURE_ENABLED_MASK, fpu_user_cfg.max_features);
193

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