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On many systems, due to the continuously growing amounts of installed memory, MTRRs get configured with at least one huge WB range, and with MMIO ranges below 4Gb then forced to UC via overlapping MTRRs. mtrr_add(), as it is today, can't deal with such a setup. Hence on such systems we presently leave the frame buffer mapped UC, leading to significantly reduced performance when using REP STOSB / REP MOVSB. On post-PentiumII hardware (i.e. any that's capable of running 64-bit code), an effective memory type of WC can be achieved without MTRRs, by simply referencing the respective PAT entry from the PTEs. While this will leave the switch to ERMS forms of memset() and memcpy() with largely unchanged performance, the change here on its own improves performance on affected systems quite significantly: Measuring just the individual affected memcpy() invocations yielded a speedup by a factor of over 250 on my initial (Skylake) test system. memset() isn't getting improved by as much there, but still by a factor of about 20. While adding {__,}PAGE_HYPERVISOR_WC, also add {__,}PAGE_HYPERVISOR_WT to, at the very least, make clear what PTE flags this memory type uses. Signed-off-by: Jan Beulich --- REPOST (in isolation) upon Roger's request. The header location change I don't really consider a "re-base". v2: Mark ioremap_wc() __init. --- TBD: If the VGA range is WC in the fixed range MTRRs, reusing the low 1st Mb mapping (like ioremap() does) would be an option. --- a/xen/arch/x86/include/asm/mm.h +++ b/xen/arch/x86/include/asm/mm.h @@ -602,6 +602,8 @@ void destroy_perdomain_mapping(struct do unsigned int nr); void free_perdomain_mappings(struct domain *); +void __iomem *ioremap_wc(paddr_t, size_t); + extern int memory_add(unsigned long spfn, unsigned long epfn, unsigned int pxm); void domain_set_alloc_bitsize(struct domain *d); --- a/xen/arch/x86/include/asm/page.h +++ b/xen/arch/x86/include/asm/page.h @@ -349,8 +349,10 @@ void efi_update_l4_pgtable(unsigned int #define __PAGE_HYPERVISOR_RX (_PAGE_PRESENT | _PAGE_ACCESSED) #define __PAGE_HYPERVISOR (__PAGE_HYPERVISOR_RX | \ _PAGE_DIRTY | _PAGE_RW) +#define __PAGE_HYPERVISOR_WT (__PAGE_HYPERVISOR | _PAGE_PWT) #define __PAGE_HYPERVISOR_UCMINUS (__PAGE_HYPERVISOR | _PAGE_PCD) #define __PAGE_HYPERVISOR_UC (__PAGE_HYPERVISOR | _PAGE_PCD | _PAGE_PWT) +#define __PAGE_HYPERVISOR_WC (__PAGE_HYPERVISOR | _PAGE_PAT) #define __PAGE_HYPERVISOR_SHSTK (__PAGE_HYPERVISOR_RO | _PAGE_DIRTY) #define MAP_SMALL_PAGES _PAGE_AVAIL0 /* don't use superpages mappings */ --- a/xen/arch/x86/include/asm/x86_64/page.h +++ b/xen/arch/x86/include/asm/x86_64/page.h @@ -152,6 +152,10 @@ static inline intpte_t put_pte_flags(uns _PAGE_GLOBAL | _PAGE_NX) #define PAGE_HYPERVISOR_UC (__PAGE_HYPERVISOR_UC | \ _PAGE_GLOBAL | _PAGE_NX) +#define PAGE_HYPERVISOR_WC (__PAGE_HYPERVISOR_WC | \ + _PAGE_GLOBAL | _PAGE_NX) +#define PAGE_HYPERVISOR_WT (__PAGE_HYPERVISOR_WT | \ + _PAGE_GLOBAL | _PAGE_NX) #endif /* __X86_64_PAGE_H__ */ --- a/xen/arch/x86/mm.c +++ b/xen/arch/x86/mm.c @@ -5895,6 +5895,20 @@ void __iomem *ioremap(paddr_t pa, size_t return (void __force __iomem *)va; } +void __iomem *__init ioremap_wc(paddr_t pa, size_t len) +{ + mfn_t mfn = _mfn(PFN_DOWN(pa)); + unsigned int offs = pa & (PAGE_SIZE - 1); + unsigned int nr = PFN_UP(offs + len); + void *va; + + WARN_ON(page_is_ram_type(mfn_x(mfn), RAM_TYPE_CONVENTIONAL)); + + va = __vmap(&mfn, nr, 1, 1, PAGE_HYPERVISOR_WC, VMAP_DEFAULT); + + return (void __force __iomem *)(va + offs); +} + int create_perdomain_mapping(struct domain *d, unsigned long va, unsigned int nr, l1_pgentry_t **pl1tab, struct page_info **ppg) --- a/xen/drivers/video/vesa.c +++ b/xen/drivers/video/vesa.c @@ -9,9 +9,9 @@ #include #include #include +#include #include #include -#include #include "font.h" #include "lfb.h" @@ -103,7 +103,7 @@ void __init vesa_init(void) lfbp.text_columns = vlfb_info.width / font->width; lfbp.text_rows = vlfb_info.height / font->height; - lfbp.lfb = lfb = ioremap(lfb_base(), vram_remap); + lfbp.lfb = lfb = ioremap_wc(lfb_base(), vram_remap); if ( !lfb ) return; @@ -179,8 +179,7 @@ void __init vesa_mtrr_init(void) static void lfb_flush(void) { - if ( vesa_mtrr == 3 ) - __asm__ __volatile__ ("sfence" : : : "memory"); + __asm__ __volatile__ ("sfence" : : : "memory"); } void __init vesa_endboot(bool_t keep) --- a/xen/drivers/video/vga.c +++ b/xen/drivers/video/vga.c @@ -79,7 +79,7 @@ void __init video_init(void) { case XEN_VGATYPE_TEXT_MODE_3: if ( page_is_ram_type(paddr_to_pfn(0xB8000), RAM_TYPE_CONVENTIONAL) || - ((video = ioremap(0xB8000, 0x8000)) == NULL) ) + ((video = ioremap_wc(0xB8000, 0x8000)) == NULL) ) return; outw(0x200a, 0x3d4); /* disable cursor */ columns = vga_console_info.u.text_mode_3.columns; @@ -164,7 +164,11 @@ void __init video_endboot(void) { case XEN_VGATYPE_TEXT_MODE_3: if ( !vgacon_keep ) + { memset(video, 0, columns * lines * 2); + iounmap(video); + video = ZERO_BLOCK_PTR; + } break; case XEN_VGATYPE_VESA_LFB: case XEN_VGATYPE_EFI_LFB: