From: Mihai Donțu <[email protected]> This adds support for all encoding variants of lfence (0x0f 0xae 0xe[8-f]).
I did not use rmb() in case it will be made to use a different instruction on future architectures. Signed-off-by: Mihai Donțu <[email protected]> Signed-off-by: Adalbert Lazăr <[email protected]> --- arch/x86/kvm/emulate.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index a2e5e63bd94a..287d3751675d 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -4168,6 +4168,12 @@ static int em_fxrstor(struct x86_emulate_ctxt *ctxt) return rc; } +static int em_lfence(struct x86_emulate_ctxt *ctxt) +{ + asm volatile ("lfence" ::: "memory"); + return X86EMUL_CONTINUE; +} + static bool valid_cr(int nr) { switch (nr) { @@ -4554,7 +4560,7 @@ static const struct group_dual group15 = { { I(ModRM | Aligned16, em_fxrstor), N, N, N, N, N, GP(0, &pfx_0f_ae_7), }, { - N, N, N, N, N, N, N, N, + N, N, N, N, N, I(ModRM | Sse, em_lfence), N, N, } }; static const struct gprefix pfx_0f_6f_0f_7f = { _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
