[RFC PATCH v6 88/92] kvm: x86: emulate fst/fstp m64fp
From: Adalbert Lazăr <hidden>
Date: 2019-08-09 16:05:48
Also in:
kvm, linux-mm
Subsystem:
kernel virtual machine for x86 (kvm/x86), the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Sean Christopherson, Paolo Bonzini, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
From: Mihai Donțu <redacted> This adds support for fst m64fp and fstp m64fp. Signed-off-by: Mihai Donțu <redacted> Signed-off-by: Adalbert Lazăr <redacted> --- arch/x86/kvm/emulate.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 14895c043edc..7261b94c6c00 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c@@ -1178,6 +1178,26 @@ static int em_fnstsw(struct x86_emulate_ctxt *ctxt) return X86EMUL_CONTINUE; } +static int em_fstp(struct x86_emulate_ctxt *ctxt) +{ + if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM)) + return emulate_nm(ctxt); + + asm volatile("fstpl %0" : "=m"(ctxt->dst.val)); + + return X86EMUL_CONTINUE; +} + +static int em_fst(struct x86_emulate_ctxt *ctxt) +{ + if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM)) + return emulate_nm(ctxt); + + asm volatile("fstl %0" : "=m"(ctxt->dst.val)); + + return X86EMUL_CONTINUE; +} + static int em_xorps(struct x86_emulate_ctxt *ctxt) { const sse128_t *src = &ctxt->src.vec_val;
@@ -4678,7 +4698,8 @@ static const struct escape escape_db = { { } }; static const struct escape escape_dd = { { - N, N, N, N, N, N, N, I(DstMem16 | Mov, em_fnstsw), + N, N, I(DstMem64 | Mov, em_fst), I(DstMem64 | Mov, em_fstp), + N, N, N, I(DstMem16 | Mov, em_fnstsw), }, { /* 0xC0 - 0xC7 */ N, N, N, N, N, N, N, N,
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