From: Nicholas Piggin <npiggin@gmail.com>
Date: Tue, 13 Feb 2024 07:50:43 +0000 (+1000)
Subject: target/ppc: Fix lxv/stxv MSR facility check
X-Git-Tag: v7.2.10~17
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a15b7df35bf279b1328ee6b7939c8384aa1d364c;p=thirdparty%2Fqemu.git

target/ppc: Fix lxv/stxv MSR facility check

The move to decodetree flipped the inequality test for the VEC / VSX
MSR facility check.

This caused application crashes under Linux, where these facility
unavailable interrupts are used for lazy-switching of VEC/VSX register
sets. Getting the incorrect interrupt would result in wrong registers
being loaded, potentially overwriting live values and/or exposing
stale ones.

Cc: qemu-stable@nongnu.org
Reported-by: Joel Stanley <joel@jms.id.au>
Fixes: 70426b5bb738 ("target/ppc: moved stxvx and lxvx from legacy to decodtree")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1769
Reviewed-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Tested-by: Harsh Prateek Bora <harshpb@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Tested-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

(cherry picked from commit 2cc0e449d17310877fb28a942d4627ad22bb68ea)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
---

diff --git a/target/ppc/translate/vsx-impl.c.inc b/target/ppc/translate/vsx-impl.c.inc
index 4deb29ee425..de1709809d0 100644
--- a/target/ppc/translate/vsx-impl.c.inc
+++ b/target/ppc/translate/vsx-impl.c.inc
@@ -2518,7 +2518,7 @@ static bool do_lstxv(DisasContext *ctx, int ra, TCGv displ,
 
 static bool do_lstxv_D(DisasContext *ctx, arg_D *a, bool store, bool paired)
 {
-    if (paired || a->rt >= 32) {
+    if (paired || a->rt < 32) {
         REQUIRE_VSX(ctx);
     } else {
         REQUIRE_VECTOR(ctx);