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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-16 03:22:58 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-16 03:22:58 +0000
commite5e4452190fd42838db4b11912bd8cd03fa61e08 (patch)
tree374214b3170254d7666dd99241b14417b54983c2 /arch/x86/kernel/fpu
parentReleasing progress-linux version 6.1.82-1progress7u1. (diff)
downloadlinux-e5e4452190fd42838db4b11912bd8cd03fa61e08.tar.xz
linux-e5e4452190fd42838db4b11912bd8cd03fa61e08.zip
Merging upstream version 6.1.85.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/x86/kernel/fpu')
-rw-r--r--arch/x86/kernel/fpu/xstate.c5
-rw-r--r--arch/x86/kernel/fpu/xstate.h14
2 files changed, 13 insertions, 6 deletions
diff --git a/arch/x86/kernel/fpu/xstate.c b/arch/x86/kernel/fpu/xstate.c
index ebe698f8a..2aa849705 100644
--- a/arch/x86/kernel/fpu/xstate.c
+++ b/arch/x86/kernel/fpu/xstate.c
@@ -177,10 +177,11 @@ void fpu__init_cpu_xstate(void)
* Must happen after CR4 setup and before xsetbv() to allow KVM
* lazy passthrough. Write independent of the dynamic state static
* key as that does not work on the boot CPU. This also ensures
- * that any stale state is wiped out from XFD.
+ * that any stale state is wiped out from XFD. Reset the per CPU
+ * xfd cache too.
*/
if (cpu_feature_enabled(X86_FEATURE_XFD))
- wrmsrl(MSR_IA32_XFD, init_fpstate.xfd);
+ xfd_set_state(init_fpstate.xfd);
/*
* XCR_XFEATURE_ENABLED_MASK (aka. XCR0) sets user features
diff --git a/arch/x86/kernel/fpu/xstate.h b/arch/x86/kernel/fpu/xstate.h
index 3518fb26d..19ca623ff 100644
--- a/arch/x86/kernel/fpu/xstate.h
+++ b/arch/x86/kernel/fpu/xstate.h
@@ -148,20 +148,26 @@ static inline void xfd_validate_state(struct fpstate *fpstate, u64 mask, bool rs
#endif
#ifdef CONFIG_X86_64
+static inline void xfd_set_state(u64 xfd)
+{
+ wrmsrl(MSR_IA32_XFD, xfd);
+ __this_cpu_write(xfd_state, xfd);
+}
+
static inline void xfd_update_state(struct fpstate *fpstate)
{
if (fpu_state_size_dynamic()) {
u64 xfd = fpstate->xfd;
- if (__this_cpu_read(xfd_state) != xfd) {
- wrmsrl(MSR_IA32_XFD, xfd);
- __this_cpu_write(xfd_state, xfd);
- }
+ if (__this_cpu_read(xfd_state) != xfd)
+ xfd_set_state(xfd);
}
}
extern int __xfd_enable_feature(u64 which, struct fpu_guest *guest_fpu);
#else
+static inline void xfd_set_state(u64 xfd) { }
+
static inline void xfd_update_state(struct fpstate *fpstate) { }
static inline int __xfd_enable_feature(u64 which, struct fpu_guest *guest_fpu) {