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[2603:800c:1201:c600:9001:d56a:9ee0:246]) by smtp.gmail.com with ESMTPSA id q13-20020a056a00088d00b004e1bea9c582sm8304021pfj.43.2022.02.26.18.04.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 26 Feb 2022 18:04:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=YMeVqoit7tAu+rAEKby5Z5DLjeBrKYE/OoQi3dZWbyk=; b=oLbuldUDIXNM/3BUYhGdnmzANKuY72GQzTjDnuFzXiBEFQVIEdLqv4tRlK++Rl/rO5 Tm4NJPXSoxhpra0CjbEPgHT7+V5FWqKnlqTjGsJRUdYrx+CR7Lj1YEfTWquoVJpHKbaS 8oV+fc9+4RcVLb9RSqIZZu82vNo9JerWSenZGNl0HJ9bBc7XPAY3ctuwvTfa0Y4dULyA PguRpzbEafUusVio07qxhhvU/NUlAO0yu+YqS3wUSZXjSGSQrMjRZ7nK+1aQtv8Km8k3 Gm9IW8bjkfvPMZ7ARNmQumbqksaP9t5o4XCj4/brBknqMS5/dg2/wd/ChyUiwJhHN1L9 UHmg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=YMeVqoit7tAu+rAEKby5Z5DLjeBrKYE/OoQi3dZWbyk=; b=rJ5NS+rGOeSQFVlQqTiOaloCm1c7F2+6pNChhMQZBvHLykMlAwPrLuCaRtZO0NzaIY U38qHnH8xii/l7sVyNK12pvDjoE+KsC623p6bW8gUVoAvMECy5o/qkjhh+ddKzfnMpg1 c7xp2HvrUDMVBXsq84SGT8hyl+u+SpSU5dlbKb4VCvsWIwOnO+5KrkvOCIAZcNIduXzO 4sP2wBtjaI3AHPNzh24gzmdVGFqsMQUbesnJkhVF7xViquJXsPt7W7xH/i7MP+xySLcd HChDd2HnxK1HZ4hG5QPRqXDHWLUT0PjT7vAOcurTSVPbhgdviNcaEE2t3seK84LkFFT0 Vphw== X-Gm-Message-State: AOAM533OsrOcPJx6lgTRXDJhhNnbYqPaVWo0Kg9aNS1xxqA9j/zm5vPI DGLzeRZ8uL0K1V/RUPs907pc5fYf3k8VKu09 X-Google-Smtp-Source: ABdhPJxJPnqEssU+YRG8wsWYdw3M9diCY+RblT7QpG4/d0fK84uKG47elnQB/JGL6AdMyBRtdTA1SQ== X-Received: by 2002:a17:90b:d91:b0:1bc:ade1:54e3 with SMTP id bg17-20020a17090b0d9100b001bcade154e3mr10220393pjb.8.1645927461415; Sat, 26 Feb 2022 18:04:21 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v2 4/9] accel/tcg: Add guest_base_signed_addr32 for user-only Date: Sat, 26 Feb 2022 16:04:08 -1000 Message-Id: <20220227020413.11741-5-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220227020413.11741-1-richard.henderson@linaro.org> References: <20220227020413.11741-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Host-Lookup-Failed: Reverse DNS lookup failed for 2607:f8b0:4864:20::1032 (failed) Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::1032; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x1032.google.com X-Spam_score_int: -6 X-Spam_score: -0.7 X-Spam_bar: / X-Spam_report: (-0.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, PDS_HP_HELO_NORDNS=0.659, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1645928570732100001 While the host may prefer to treat 32-bit addresses as signed, there are edge cases of guests that cannot be implemented with addresses 0x7fff_ffff and 0x8000_0000 being non-consecutive. Therefore, default to guest_base_signed_addr32 false, and allow probe_guest_base to determine whether it is possible to set it to true. A tcg backend which sets TCG_TARGET_SIGNED_ADDR32 will have to cope with either setting for user-only. Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Richard Henderson Reviewed-by: Peter Maydell --- include/exec/cpu-all.h | 16 ++++++++++++++++ include/exec/cpu_ldst.h | 3 ++- bsd-user/main.c | 4 ++++ linux-user/main.c | 3 +++ 4 files changed, 25 insertions(+), 1 deletion(-) diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h index 84caf5c3d9..26ecd3c886 100644 --- a/include/exec/cpu-all.h +++ b/include/exec/cpu-all.h @@ -146,6 +146,7 @@ static inline void tswap64s(uint64_t *s) =20 #if defined(CONFIG_USER_ONLY) #include "exec/user/abitypes.h" +#include "tcg-target-sa32.h" =20 /* On some host systems the guest address space is reserved on the host. * This allows the guest address space to be offset to a convenient locati= on. @@ -154,6 +155,21 @@ extern uintptr_t guest_base; extern bool have_guest_base; extern unsigned long reserved_va; =20 +#if TCG_TARGET_SIGNED_ADDR32 && TARGET_LONG_BITS =3D=3D 32 +extern bool guest_base_signed_addr32; +#else +#define guest_base_signed_addr32 false +#endif + +static inline void set_guest_base_signed_addr32(void) +{ +#ifdef guest_base_signed_addr32 + qemu_build_not_reached(); +#else + guest_base_signed_addr32 =3D true; +#endif +} + /* * Limit the guest addresses as best we can. * diff --git a/include/exec/cpu_ldst.h b/include/exec/cpu_ldst.h index da987fe8ad..add45499ee 100644 --- a/include/exec/cpu_ldst.h +++ b/include/exec/cpu_ldst.h @@ -87,7 +87,8 @@ static inline abi_ptr cpu_untagged_addr(CPUState *cs, abi= _ptr x) /* All direct uses of g2h and h2g need to go away for usermode softmmu. */ static inline void *g2h_untagged(abi_ptr x) { - return (void *)((uintptr_t)(x) + guest_base); + uintptr_t hx =3D guest_base_signed_addr32 ? (int32_t)x : (uintptr_t)x; + return (void *)(guest_base + hx); } =20 static inline void *g2h(CPUState *cs, abi_ptr x) diff --git a/bsd-user/main.c b/bsd-user/main.c index f1d58e905e..cca4b9a502 100644 --- a/bsd-user/main.c +++ b/bsd-user/main.c @@ -54,6 +54,10 @@ int singlestep; uintptr_t guest_base; bool have_guest_base; +#ifndef guest_base_signed_addr32 +bool guest_base_signed_addr32; +#endif + /* * When running 32-on-64 we should make sure we can fit all of the possible * guest address space into a contiguous chunk of virtual host memory. diff --git a/linux-user/main.c b/linux-user/main.c index fbc9bcfd5f..5d963ddb64 100644 --- a/linux-user/main.c +++ b/linux-user/main.c @@ -72,6 +72,9 @@ static const char *seed_optarg; unsigned long mmap_min_addr; uintptr_t guest_base; bool have_guest_base; +#ifndef guest_base_signed_addr32 +bool guest_base_signed_addr32; +#endif =20 /* * Used to implement backwards-compatibility for the `-strace`, and --=20 2.25.1