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Mon, 09 Mar 2026 14:49:13 -0700 (PDT) From: Lucas Amaral To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, agraf@csgraf.de, Lucas Amaral Subject: [PATCH 1/2] accel/hvf: introduce map granule abstraction Date: Mon, 9 Mar 2026 18:49:05 -0300 Message-ID: <20260309214906.92578-2-lucaaamaral@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260309214906.92578-1-lucaaamaral@gmail.com> References: <20260309214906.92578-1-lucaaamaral@gmail.com> 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::122f; envelope-from=lucaaamaral@gmail.com; helo=mail-dl1-x122f.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, FREEMAIL_FROM=0.001, FSL_HELO_BARE_IP_2=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Mon, 09 Mar 2026 18:16:41 -0400 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development 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 @gmail.com) X-ZM-MESSAGEID: 1773094644933154100 Content-Type: text/plain; charset="utf-8" Replace hardcoded qemu_real_host_page_size() calls in HVF memory mapping with a configurable map granule (hvf_set/get_map_granule). On macOS ARM64, the host page size is 16KB, but the guest kernel typically uses 4KB pages. The map granule determines the minimum alignment for hv_vm_map() and hv_vm_protect(). Default behavior is unchanged (returns host page size). A subsequent commit will configure 4KB granule on macOS 26+. Also fix the non-aligned region path in hvf_set_phys_mem() to return early instead of proceeding with add=3Dfalse, which would attempt an unnecessary unmap of a region that was never mapped. Signed-off-by: Lucas Amaral --- accel/hvf/hvf-all.c | 21 ++++++++++++++++++--- include/system/hvf.h | 15 +++++++++++++++ 2 files changed, 33 insertions(+), 3 deletions(-) diff --git a/accel/hvf/hvf-all.c b/accel/hvf/hvf-all.c index 033c677..ccff626 100644 --- a/accel/hvf/hvf-all.c +++ b/accel/hvf/hvf-all.c @@ -23,6 +23,21 @@ =20 bool hvf_allowed; =20 +static uint64_t hvf_map_granule; + +void hvf_set_map_granule(uint64_t size) +{ + hvf_map_granule =3D size; +} + +uint64_t hvf_get_map_granule(void) +{ + if (!hvf_map_granule) { + return qemu_real_host_page_size(); + } + return hvf_map_granule; +} + const char *hvf_return_string(hv_return_t ret) { switch (ret) { @@ -54,7 +69,7 @@ void assert_hvf_ok_impl(hv_return_t ret, const char *file= , unsigned int line, static void do_hv_vm_protect(hwaddr start, size_t size, hv_memory_flags_t flags) { - intptr_t page_mask =3D qemu_real_host_page_mask(); + intptr_t page_mask =3D -(intptr_t)hvf_get_map_granule(); hv_return_t ret; =20 trace_hvf_vm_protect(start, size, flags, @@ -84,7 +99,7 @@ static void hvf_set_phys_mem(MemoryRegionSection *section= , bool add) MemoryRegion *area =3D section->mr; bool writable =3D !area->readonly && !area->rom_device; hv_memory_flags_t flags; - uint64_t page_size =3D qemu_real_host_page_size(); + uint64_t page_size =3D hvf_get_map_granule(); uint64_t gpa =3D section->offset_within_address_space; uint64_t size =3D int128_get64(section->size); hv_return_t ret; @@ -105,7 +120,7 @@ static void hvf_set_phys_mem(MemoryRegionSection *secti= on, bool add) if (!QEMU_IS_ALIGNED(size, page_size) || !QEMU_IS_ALIGNED(gpa, page_size)) { /* Not page aligned, so we can not map as RAM */ - add =3D false; + return; } =20 if (!add) { diff --git a/include/system/hvf.h b/include/system/hvf.h index d3dcf08..d1b702b 100644 --- a/include/system/hvf.h +++ b/include/system/hvf.h @@ -36,4 +36,19 @@ typedef struct HVFState HVFState; DECLARE_INSTANCE_CHECKER(HVFState, HVF_STATE, TYPE_HVF_ACCEL) =20 +#ifdef CONFIG_HVF_IS_POSSIBLE +/* + * Minimum alignment for hv_vm_map(). Returns host page size (16KB on + * macOS ARM64), or 4KB when HVF 4KB IPA granule is configured (macOS 26+). + */ +void hvf_set_map_granule(uint64_t size); +uint64_t hvf_get_map_granule(void); +#else +static inline void hvf_set_map_granule(uint64_t size) {} +static inline uint64_t hvf_get_map_granule(void) +{ + return qemu_real_host_page_size(); +} +#endif + #endif --=20 2.52.0 From nobody Sat Apr 11 21:30:01 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=gmail.com ARC-Seal: i=1; a=rsa-sha256; t=1773094682; cv=none; d=zohomail.com; s=zohoarc; b=bPO5tHHDNiZ/E+2FBRk4/BRu6WMrTmCyMl8TnnYS4k8mM7ZzkVYB/lhMNizCCntjvWQb0HdOrwej/oOE6NSq7gzBEMMAJCmNd26WwmFRjWjZ2v5tbL923OTo4Ix4Xij2q7pYMhyk1kRZG2S3nUHdIciHn3tkw/Bex6kfPipOXKA= ARC-Message-Signature: i=1; a=rsa-sha256; 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Mon, 09 Mar 2026 14:49:15 -0700 (PDT) From: Lucas Amaral To: qemu-devel@nongnu.org Cc: qemu-arm@nongnu.org, agraf@csgraf.de, Lucas Amaral Subject: [PATCH 2/2] target/arm/hvf: set 4KB IPA granule on macOS 26 Date: Mon, 9 Mar 2026 18:49:06 -0300 Message-ID: <20260309214906.92578-3-lucaaamaral@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260309214906.92578-1-lucaaamaral@gmail.com> References: <20260309214906.92578-1-lucaaamaral@gmail.com> 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::122e; envelope-from=lucaaamaral@gmail.com; helo=mail-dl1-x122e.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, FREEMAIL_FROM=0.001, FSL_HELO_BARE_IP_2=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-Mailman-Approved-At: Mon, 09 Mar 2026 18:16:41 -0400 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development 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 @gmail.com) X-ZM-MESSAGEID: 1773094700271158500 Content-Type: text/plain; charset="utf-8" macOS 26 introduces hv_vm_config_set_ipa_granule() which allows configuring 4KB IPA granularity for HVF virtual machines. This enables hv_vm_map() to accept 4KB-aligned addresses, matching the guest kernel's page size. Without this, virtio-gpu blob BAR offsets that are 4KB-aligned but not 16KB-aligned cannot be mapped into the guest, falling back to slow MMIO emulation. Gated behind MAC_OS_VERSION_26_0 compile-time and __builtin_available runtime checks. Falls back to the default 16KB granule on older macOS versions. Signed-off-by: Lucas Amaral --- target/arm/hvf/hvf.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c index 87ddcdb..b71a98a 100644 --- a/target/arm/hvf/hvf.c +++ b/target/arm/hvf/hvf.c @@ -960,6 +960,20 @@ hv_return_t hvf_arch_vm_create(MachineState *ms, uint3= 2_t pa_range) } chosen_ipa_bit_size =3D pa_range; =20 +#ifdef MAC_OS_VERSION_26_0 +#if MAC_OS_X_VERSION_MAX_ALLOWED >=3D MAC_OS_VERSION_26_0 + if (__builtin_available(macOS 26, *)) { + ret =3D hv_vm_config_set_ipa_granule(config, HV_IPA_GRANULE_4KB); + if (ret !=3D HV_SUCCESS) { + error_report("HVF: failed to set 4KB IPA granule: %s", + hvf_return_string(ret)); + goto cleanup; + } + hvf_set_map_granule(4096); + } +#endif +#endif + ret =3D hv_vm_create(config); =20 cleanup: --=20 2.52.0