[Devel] [PATCH RHEL7 COMMIT] ms/KVM: x86: emulate FXSAVE and FXRSTOR
Konstantin Khorenko
khorenko at virtuozzo.com
Mon Aug 7 13:41:11 MSK 2017
The commit is pushed to "branch-rh7-3.10.0-514.26.1.vz7.35.x-ovz" and will appear at https://src.openvz.org/scm/ovz/vzkernel.git
after rh7-3.10.0-514.26.1.vz7.33.22
------>
commit 0ed8ba6d68a7e77e2c07c47fff2a2f98641df252
Author: Radim KrÄmář <rkrcmar at redhat.com>
Date: Mon Aug 7 14:41:11 2017 +0400
ms/KVM: x86: emulate FXSAVE and FXRSTOR
Internal errors were reported on 16 bit fxsave and fxrstor with ipxe.
Old Intels don't have unrestricted_guest, so we have to emulate them.
The patch takes advantage of the hardware implementation.
AMD and Intel differ in saving and restoring other fields in first 32
bytes. A test wrote 0xff to the fxsave area, 0 to upper bits of MCSXR
in the fxsave area, executed fxrstor, rewrote the fxsave area to 0xee,
and executed fxsave:
Intel (Nehalem):
7f 1f 7f 7f ff 00 ff 07 ff ff ff ff ff ff 00 00
ff ff ff ff ff ff 00 00 ff ff 00 00 ff ff 00 00
Intel (Haswell -- deprecated FPU CS and FPU DS):
7f 1f 7f 7f ff 00 ff 07 ff ff ff ff 00 00 00 00
ff ff ff ff 00 00 00 00 ff ff 00 00 ff ff 00 00
AMD (Opteron 2300-series):
7f 1f 7f 7f ff 00 ee ee ee ee ee ee ee ee ee ee
ee ee ee ee ee ee ee ee ff ff 00 00 ff ff 02 00
fxsave/fxrstor will only be emulated on early Intels, so KVM can't do
much to improve the situation.
Signed-off-by: Radim KrÄmář <rkrcmar at redhat.com>
https://jira.sw.ru/browse/PSBM-69206
ms commit: 283c95d0e3891b64087706b344a4b545d04a6e62
Signed-off-by: Evgeny Yakovlev <eyakovlev at virtuozzo.com>
---
arch/x86/kvm/emulate.c | 129 ++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 128 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index ee1835d..d7e33ac 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3931,6 +3931,131 @@ static int em_movsxd(struct x86_emulate_ctxt *ctxt)
return X86EMUL_CONTINUE;
}
+static int check_fxsr(struct x86_emulate_ctxt *ctxt)
+{
+ u32 eax = 1, ebx, ecx = 0, edx;
+
+ ctxt->ops->get_cpuid(ctxt, &eax, &ebx, &ecx, &edx);
+ if (!(edx & FFL(FXSR)))
+ return emulate_ud(ctxt);
+
+ if (ctxt->ops->get_cr(ctxt, 0) & (X86_CR0_TS | X86_CR0_EM))
+ return emulate_nm(ctxt);
+
+ /*
+ * Don't emulate a case that should never be hit, instead of working
+ * around a lack of fxsave64/fxrstor64 on old compilers.
+ */
+ if (ctxt->mode >= X86EMUL_MODE_PROT64)
+ return X86EMUL_UNHANDLEABLE;
+
+ return X86EMUL_CONTINUE;
+}
+
+/*
+ * FXSAVE and FXRSTOR have 4 different formats depending on execution mode,
+ * 1) 16 bit mode
+ * 2) 32 bit mode
+ * - like (1), but FIP and FDP (foo) are only 16 bit. At least Intel CPUs
+ * preserve whole 32 bit values, though, so (1) and (2) are the same wrt.
+ * save and restore
+ * 3) 64-bit mode with REX.W prefix
+ * - like (2), but XMM 8-15 are being saved and restored
+ * 4) 64-bit mode without REX.W prefix
+ * - like (3), but FIP and FDP are 64 bit
+ *
+ * Emulation uses (3) for (1) and (2) and preserves XMM 8-15 to reach the
+ * desired result. (4) is not emulated.
+ *
+ * Note: Guest and host CPUID.(EAX=07H,ECX=0H):EBX[bit 13] (deprecate FPU CS
+ * and FPU DS) should match.
+ */
+static int em_fxsave(struct x86_emulate_ctxt *ctxt)
+{
+ struct i387_fxsave_struct fx_state;
+ size_t size;
+ int rc;
+
+ rc = check_fxsr(ctxt);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ ctxt->ops->get_fpu(ctxt);
+
+ rc = asm_safe("fxsave %[fx]", , [fx] "+m"(fx_state));
+
+ ctxt->ops->put_fpu(ctxt);
+
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ if (ctxt->ops->get_cr(ctxt, 4) & X86_CR4_OSFXSR)
+ size = offsetof(struct i387_fxsave_struct, xmm_space[8 * 16/4]);
+ else
+ size = offsetof(struct i387_fxsave_struct, xmm_space[0]);
+
+ return segmented_write_std(ctxt, ctxt->memop.addr.mem, &fx_state, size);
+}
+
+static int fxrstor_fixup(struct x86_emulate_ctxt *ctxt,
+ struct i387_fxsave_struct *new)
+{
+ int rc = X86EMUL_CONTINUE;
+ struct i387_fxsave_struct old;
+
+ rc = asm_safe("fxsave %[fx]", , [fx] "+m"(old));
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ /*
+ * 64 bit host will restore XMM 8-15, which is not correct on non-64
+ * bit guests. Load the current values in order to preserve 64 bit
+ * XMMs after fxrstor.
+ */
+#ifdef CONFIG_X86_64
+ /* XXX: accessing XMM 8-15 very awkwardly */
+ memcpy(&new->xmm_space[8 * 16/4], &old.xmm_space[8 * 16/4], 8 * 16);
+#endif
+
+ /*
+ * Hardware doesn't save and restore XMM 0-7 without CR4.OSFXSR, but
+ * does save and restore MXCSR.
+ */
+ if (!(ctxt->ops->get_cr(ctxt, 4) & X86_CR4_OSFXSR))
+ memcpy(new->xmm_space, old.xmm_space, 8 * 16);
+
+ return rc;
+}
+
+static int em_fxrstor(struct x86_emulate_ctxt *ctxt)
+{
+ struct i387_fxsave_struct fx_state;
+ int rc;
+
+ rc = check_fxsr(ctxt);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ rc = segmented_read_std(ctxt, ctxt->memop.addr.mem, &fx_state, 512);
+ if (rc != X86EMUL_CONTINUE)
+ return rc;
+
+ if (fx_state.mxcsr >> 16)
+ return emulate_gp(ctxt, 0);
+
+ ctxt->ops->get_fpu(ctxt);
+
+ if (ctxt->mode < X86EMUL_MODE_PROT64)
+ rc = fxrstor_fixup(ctxt, &fx_state);
+
+ if (rc == X86EMUL_CONTINUE)
+ rc = asm_safe("fxrstor %[fx]", : [fx] "m"(fx_state));
+
+ ctxt->ops->put_fpu(ctxt);
+
+ return rc;
+}
+
static bool valid_cr(int nr)
{
switch (nr) {
@@ -4283,7 +4408,9 @@ static const struct gprefix pfx_0f_ae_7 = {
};
static const struct group_dual group15 = { {
- N, N, N, N, N, N, N, GP(0, &pfx_0f_ae_7),
+ I(ModRM | Aligned16, em_fxsave),
+ I(ModRM | Aligned16, em_fxrstor),
+ N, N, N, N, N, GP(0, &pfx_0f_ae_7),
}, {
N, N, N, N, N, N, N, N,
} };
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