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Iglesias" To: qemu-devel@nongnu.org, Paolo Bonzini , Peter Xu , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Cc: sstabellini@kernel.org, anthony@xenproject.org, edgar.iglesias@amd.com, xen-devel@lists.xenproject.org Subject: [PULL v1 3/5] physmem: xen: Conditionalize use of the mapcache Date: Mon, 9 Mar 2026 07:44:33 +0100 Message-ID: <20260309064436.51860-4-edgar.iglesias@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260309064436.51860-1-edgar.iglesias@gmail.com> References: <20260309064436.51860-1-edgar.iglesias@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1773038718550154100 Content-Type: text/plain; charset="utf-8" From: "Edgar E. Iglesias" Conditionalize use of the mapcache. This is in preparation to optionally disable the mapcache at runtime. Signed-off-by: Edgar E. Iglesias Acked-by: Peter Xu Reviewed-by: Stefano Stabellini --- system/physmem.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/system/physmem.c b/system/physmem.c index e5ff26acec..7eecd81877 100644 --- a/system/physmem.c +++ b/system/physmem.c @@ -578,7 +578,9 @@ MemoryRegion *flatview_translate(FlatView *fv, hwaddr a= ddr, hwaddr *xlat, is_write, true, &as, attrs); mr =3D section.mr; =20 - if (xen_enabled() && memory_access_is_direct(mr, is_write, attrs)) { + if (xen_map_cache_enabled() && + memory_access_is_direct(mr, is_write, attrs)) { + /* mapcache: Next page may be unmapped or in a different bucket/VA= . */ hwaddr page =3D ((addr & TARGET_PAGE_MASK) + TARGET_PAGE_SIZE) - a= ddr; *plen =3D MIN(page, *plen); } @@ -2577,7 +2579,7 @@ static void reclaim_ramblock(RAMBlock *block) { if (block->flags & RAM_PREALLOC) { ; - } else if (xen_enabled()) { + } else if (xen_map_cache_enabled()) { xen_invalidate_map_cache_entry(block->host); #if !defined(_WIN32) && !defined(EMSCRIPTEN) } else if (block->fd >=3D 0) { @@ -2736,7 +2738,7 @@ static void *qemu_ram_ptr_length(RAMBlock *block, ram= _addr_t addr, len =3D *size; } =20 - if (xen_enabled() && block->host =3D=3D NULL) { + if (xen_map_cache_enabled() && block->host =3D=3D NULL) { /* We need to check if the requested address is in the RAM * because we don't want to map the entire memory in QEMU. * In that case just map the requested area. @@ -2785,7 +2787,7 @@ RAMBlock *qemu_ram_block_from_host(void *ptr, bool ro= und_offset, RAMBlock *block; uint8_t *host =3D ptr; =20 - if (xen_enabled()) { + if (xen_map_cache_enabled()) { ram_addr_t ram_addr; RCU_READ_LOCK_GUARD(); ram_addr =3D xen_ram_addr_from_mapcache(ptr); @@ -3787,7 +3789,7 @@ void address_space_unmap(AddressSpace *as, void *buff= er, hwaddr len, if (is_write) { invalidate_and_set_dirty(mr, addr1, access_len); } - if (xen_enabled()) { + if (xen_map_cache_enabled()) { xen_invalidate_map_cache_entry(buffer); } memory_region_unref(mr); @@ -3898,7 +3900,7 @@ void address_space_cache_destroy(MemoryRegionCache *c= ache) return; } =20 - if (xen_enabled()) { + if (xen_map_cache_enabled()) { xen_invalidate_map_cache_entry(cache->ptr); } memory_region_unref(cache->mrs.mr); --=20 2.43.0