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From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= <philmd@linaro.org>
To: qemu-devel@nongnu.org
Cc: Thomas Huth <thuth@redhat.com>,
Daniel Henrique Barboza <dbarboza@ventanamicro.com>,
Richard Henderson <richard.henderson@linaro.org>,
Paolo Bonzini <pbonzini@redhat.com>,
=?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= <philmd@linaro.org>,
=?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= <berrange@redhat.com>
Subject: [PATCH] system: Try hardware accelerators (KVM,
HVF) before software one (TCG)
Date: Fri, 3 Jan 2025 16:05:58 +0100
Message-ID: <20250103150558.1473-1-philmd@linaro.org>
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As Daniel suggested [*]:
> We should consider to rank HVF above TCG, on the basis
> that HW acceleration is faster and should provide a
> host<->guest security boundary that we don't claim for TCG
[*] https://lore.kernel.org/qemu-devel/Z07YASl2Pd3CPtjE@redhat.com/
Suggested-by: Daniel P. Berrang=C3=A9 <berrange@redhat.com>
Signed-off-by: Philippe Mathieu-Daud=C3=A9 <philmd@linaro.org>
Reviewed-by: Daniel P. Berrang=C3=A9 <berrange@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
system/vl.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/system/vl.c b/system/vl.c
index 0843b7ab49b..e20391281f8 100644
--- a/system/vl.c
+++ b/system/vl.c
@@ -2379,7 +2379,6 @@ static void configure_accelerators(const char *progna=
me)
/* Select the default accelerator */
bool have_tcg =3D accel_find("tcg");
bool have_kvm =3D accel_find("kvm");
- bool have_hvf =3D accel_find("hvf");
=20
if (have_tcg && have_kvm) {
if (g_str_has_suffix(progname, "kvm")) {
@@ -2390,10 +2389,10 @@ static void configure_accelerators(const char *prog=
name)
}
} else if (have_kvm) {
accelerators =3D "kvm";
+ } else if (accel_find("hvf")) {
+ accelerators =3D "hvf";
} else if (have_tcg) {
accelerators =3D "tcg";
- } else if (have_hvf) {
- accelerators =3D "hvf";
} else {
error_report("No accelerator selected and"
" no default accelerator available");
--=20
2.47.1