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Peter Anvin" , Oleksandr Tyshchenko , xen-devel@lists.xenproject.org Subject: [PATCH 2/2] xen/swiotlb: don't destroy contiguous region in all cases Date: Tue, 11 Feb 2025 13:04:32 +0100 Message-ID: <20250211120432.29493-3-jgross@suse.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250211120432.29493-1-jgross@suse.com> References: <20250211120432.29493-1-jgross@suse.com> Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 5B9D93E9A0 X-Spam-Score: -3.01 X-Rspamd-Action: no action X-Spamd-Result: default: False [-3.01 / 50.00]; BAYES_HAM(-3.00)[100.00%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_MISSING_CHARSET(0.50)[]; R_DKIM_ALLOW(-0.20)[suse.com:s=susede1]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; FUZZY_BLOCKED(0.00)[rspamd.com]; DKIM_SIGNED(0.00)[suse.com:s=susede1]; MIME_TRACE(0.00)[0:+]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RCPT_COUNT_TWELVE(0.00)[13]; ARC_NA(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; FROM_EQ_ENVFROM(0.00)[]; ASN(0.00)[asn:25478, ipnet:::/0, country:RU]; RCVD_TLS_ALL(0.00)[]; DKIM_TRACE(0.00)[suse.com:+]; TO_DN_SOME(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo,suse.com:dkim,suse.com:mid,suse.com:email] X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spam-Flag: NO X-Spam-Level: In case xen_swiotlb_alloc_coherent() needed to create a contiguous region only for other reason than the memory not being compliant with the device's DMA mask, there is no reason why this contiguous region should be destroyed by xen_swiotlb_free_coherent() later. Destroying this region should be done only, if the memory of the region was allocated with more stringent placement requirements than the memory it did replace. Signed-off-by: Juergen Gross --- arch/x86/include/asm/xen/swiotlb-xen.h | 5 +++-- arch/x86/xen/mmu_pv.c | 18 ++++++++++++------ drivers/xen/swiotlb-xen.c | 11 +++++++---- 3 files changed, 22 insertions(+), 12 deletions(-) diff --git a/arch/x86/include/asm/xen/swiotlb-xen.h b/arch/x86/include/asm/xen/swiotlb-xen.h index abde0f44df57..a353f20c7e79 100644 --- a/arch/x86/include/asm/xen/swiotlb-xen.h +++ b/arch/x86/include/asm/xen/swiotlb-xen.h @@ -4,8 +4,9 @@ int xen_swiotlb_fixup(void *buf, unsigned long nslabs); int xen_create_contiguous_region(phys_addr_t pstart, unsigned int order, - unsigned int address_bits, - dma_addr_t *dma_handle); + unsigned int address_bits, + dma_addr_t *dma_handle, + unsigned int *address_bits_in); void xen_destroy_contiguous_region(phys_addr_t pstart, unsigned int order); #endif /* _ASM_X86_SWIOTLB_XEN_H */ diff --git a/arch/x86/xen/mmu_pv.c b/arch/x86/xen/mmu_pv.c index 2c70cd35e72c..fb586238f7c4 100644 --- a/arch/x86/xen/mmu_pv.c +++ b/arch/x86/xen/mmu_pv.c @@ -2208,19 +2208,22 @@ void __init xen_init_mmu_ops(void) static unsigned long discontig_frames[1<coherent_dma_mask; + unsigned int address_bits = fls64(dma_mask), address_bits_in; int order = get_order(size); phys_addr_t phys; void *ret; @@ -160,10 +162,11 @@ xen_swiotlb_alloc_coherent(struct device *dev, size_t size, if (*dma_handle + size - 1 > dma_mask || range_straddles_page_boundary(phys, size) || range_requires_alignment(phys, size)) { - if (xen_create_contiguous_region(phys, order, fls64(dma_mask), - dma_handle) != 0) + if (xen_create_contiguous_region(phys, order, address_bits, + dma_handle, &address_bits_in)) goto out_free_pages; - SetPageXenRemapped(virt_to_page(ret)); + if (address_bits_in > address_bits) + SetPageXenRemapped(virt_to_page(ret)); } memset(ret, 0, size); -- 2.43.0