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Tue, 26 Aug 2025 18:07:48 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org Subject: [PATCH 33/61] target/arm: Redirect VHE FOO_EL1 -> FOO_EL2 during translation Date: Wed, 27 Aug 2025 11:04:24 +1000 Message-ID: <20250827010453.4059782-38-richard.henderson@linaro.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250827010453.4059782-1-richard.henderson@linaro.org> References: <20250827010453.4059782-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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::434; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x434.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1756257116578116600 Content-Type: text/plain; charset="utf-8" Signed-off-by: Richard Henderson Reviewed-by: Manos Pitsidianakis --- target/arm/cpregs.h | 6 ++++ target/arm/gdbstub.c | 5 ++++ target/arm/helper.c | 53 +--------------------------------- target/arm/tcg/translate-a64.c | 9 ++++++ 4 files changed, 21 insertions(+), 52 deletions(-) diff --git a/target/arm/cpregs.h b/target/arm/cpregs.h index 7bdf6cf847..d34ed0d40b 100644 --- a/target/arm/cpregs.h +++ b/target/arm/cpregs.h @@ -911,6 +911,12 @@ struct ARMCPRegInfo { */ uint32_t nv2_redirect_offset; =20 + /* + * With VHE, with E2H, at EL2, access to this EL0/EL1 reg redirects + * to the EL2 reg with the specified key. + */ + uint32_t vhe_redir_to_el2; + /* This is used only by VHE. */ void *opaque; /* diff --git a/target/arm/gdbstub.c b/target/arm/gdbstub.c index e2fc389170..3727dc01af 100644 --- a/target/arm/gdbstub.c +++ b/target/arm/gdbstub.c @@ -249,6 +249,11 @@ static int arm_gdb_get_sysreg(CPUState *cs, GByteArray= *buf, int reg) if (ri) { switch (cpreg_field_type(ri)) { case MO_64: + if (ri->vhe_redir_to_el2 && + (arm_hcr_el2_eff(env) & HCR_E2H) && + arm_current_el(env) =3D=3D 2) { + ri =3D get_arm_cp_reginfo(cpu->cp_regs, ri->vhe_redir_to_e= l2); + } return gdb_get_reg64(buf, (uint64_t)read_raw_cp_reg(env, ri)); case MO_32: return gdb_get_reg32(buf, (uint32_t)read_raw_cp_reg(env, ri)); diff --git a/target/arm/helper.c b/target/arm/helper.c index d0ccc23811..3f69ce6cb5 100644 --- a/target/arm/helper.c +++ b/target/arm/helper.c @@ -4441,47 +4441,6 @@ static CPAccessResult access_el1nvvct(CPUARMState *e= nv, const ARMCPRegInfo *ri, return e2h_access(env, ri, isread); } =20 -/* Test if system register redirection is to occur in the current state. = */ -static bool redirect_for_e2h(CPUARMState *env) -{ - return arm_current_el(env) =3D=3D 2 && (arm_hcr_el2_eff(env) & HCR_E2H= ); -} - -static uint64_t el2_e2h_read(CPUARMState *env, const ARMCPRegInfo *ri) -{ - CPReadFn *readfn; - - if (redirect_for_e2h(env)) { - /* Switch to the saved EL2 version of the register. */ - ri =3D ri->opaque; - readfn =3D ri->readfn; - } else { - readfn =3D ri->orig_readfn; - } - if (readfn =3D=3D NULL) { - readfn =3D raw_read; - } - return readfn(env, ri); -} - -static void el2_e2h_write(CPUARMState *env, const ARMCPRegInfo *ri, - uint64_t value) -{ - CPWriteFn *writefn; - - if (redirect_for_e2h(env)) { - /* Switch to the saved EL2 version of the register. */ - ri =3D ri->opaque; - writefn =3D ri->writefn; - } else { - writefn =3D ri->orig_writefn; - } - if (writefn =3D=3D NULL) { - writefn =3D raw_write; - } - writefn(env, ri, value); -} - static uint64_t el2_e2h_e12_read(CPUARMState *env, const ARMCPRegInfo *ri) { /* Pass the EL1 register accessor its ri, not the EL12 alias ri */ @@ -4657,17 +4616,7 @@ static void define_arm_vh_e2h_redirects_aliases(ARMC= PU *cpu) (gpointer)(uintptr_t)a->new_key, new_reg); g_assert(ok); =20 - src_reg->opaque =3D dst_reg; - src_reg->orig_readfn =3D src_reg->readfn ?: raw_read; - src_reg->orig_writefn =3D src_reg->writefn ?: raw_write; - if (!src_reg->raw_readfn) { - src_reg->raw_readfn =3D raw_read; - } - if (!src_reg->raw_writefn) { - src_reg->raw_writefn =3D raw_write; - } - src_reg->readfn =3D el2_e2h_read; - src_reg->writefn =3D el2_e2h_write; + src_reg->vhe_redir_to_el2 =3D a->dst_key; } } #endif diff --git a/target/arm/tcg/translate-a64.c b/target/arm/tcg/translate-a64.c index 8303f0dac2..8fcc74d151 100644 --- a/target/arm/tcg/translate-a64.c +++ b/target/arm/tcg/translate-a64.c @@ -2573,6 +2573,15 @@ static void handle_sys(DisasContext *s, bool isread, } } =20 + if (ri->vhe_redir_to_el2 && s->current_el =3D=3D 2 && s->e2h) { + /* + * This one of the FOO_EL1 registers which redirect to FOO_EL2 + * from EL2 when HCR_EL2.E2H is set. + */ + key =3D ri->vhe_redir_to_el2; + ri =3D redirect_cpreg(s, key, isread); + } + if (ri->accessfn || (ri->fgt && s->fgt_active)) { /* Emit code to perform further access permissions checks at * runtime; this may result in an exception. --=20 2.43.0