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Commit dd4bfa73 authored by Thomas Gleixner's avatar Thomas Gleixner
Browse files

x86/kvm: Serialize L1D flush parameter setter 



Writes to the parameter files are not serialized at the sysfs core
level, so local serialization is required.

Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Tested-by: default avatarJiri Kosina <jkosina@suse.cz>
Reviewed-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: default avatarJosh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/20180713142322.873642605@linutronix.de
parent 4c6523ec

arch/x86/kvm/vmx.c

+6 −2
Original line number Diff line number Diff line
@@ -193,6 +193,7 @@ extern const ulong vmx_return; 


static DEFINE_STATIC_KEY_FALSE(vmx_l1d_should_flush);

static DEFINE_STATIC_KEY_FALSE(vmx_l1d_flush_always);

static DEFINE_MUTEX(vmx_l1d_flush_mutex);



/* Storage for pre module init parameter parsing */

static enum vmx_l1d_flush_state __read_mostly vmentry_l1d_flush_param = VMENTER_L1D_FLUSH_AUTO;
@@ -257,7 +258,7 @@ static int vmentry_l1d_flush_parse(const char *s) 


static int vmentry_l1d_flush_set(const char *s, const struct kernel_param *kp)

{

	int l1tf;

	int l1tf, ret;



	if (!boot_cpu_has(X86_BUG_L1TF))

		return 0;
@@ -277,7 +278,10 @@ static int vmentry_l1d_flush_set(const char *s, const struct kernel_param *kp) 
		return 0;

	}



	return vmx_setup_l1d_flush(l1tf);

	mutex_lock(&vmx_l1d_flush_mutex);

	ret = vmx_setup_l1d_flush(l1tf);

	mutex_unlock(&vmx_l1d_flush_mutex);

	return ret;

}



static int vmentry_l1d_flush_get(char *s, const struct kernel_param *kp)