From 93de2a6a4b91b72607136dd656edf03fb399d27f Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Wed, 23 Sep 2026 09:37:21 -0700 Subject: KVM: SEV: Do cache maintenance on the source VM during intra-host migration Manually perform cache maintenance on the source VM during intra-host migration to ensure no stale data is left in CPU caches after the VM is destroyed. Because the source VM is "converted" to a non-SEV VM, KVM's memory reclaim flows won't trigger cache maintenance, e.g. when all guest memory is reclaimed in response to detaching from the mmu_notifier. Note, relying on the destination VM to do cache maintenance isn't an option as KVM doesn't require identical guest memory configurations, i.e. the source VM may have access to memory that the destination VM does not. Enforcing equivalent memory configurations is infeasible, as it would require a *deep* comparison of memslots, e.g. to verify that not only are the memslot identical, but what the memslots point at is also identical. Fixes: b56639318bb2 ("KVM: SEV: Add support for SEV intra host migration") Cc: stable@vger.kernel.org Reported-by: Stefan Teodorescu Signed-off-by: Sean Christopherson Message-ID: <20260923163721.1584779-3-seanjc@google.com> Signed-off-by: Paolo Bonzini --- drivers/video/fbdev/fm2fb.c | 320 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 320 insertions(+) create mode 100644 drivers/video/fbdev/fm2fb.c (limited to 'drivers/video/fbdev/fm2fb.c') diff --git a/drivers/video/fbdev/fm2fb.c b/drivers/video/fbdev/fm2fb.c new file mode 100644 index 000000000..25d2e716e --- /dev/null +++ b/drivers/video/fbdev/fm2fb.c @@ -0,0 +1,320 @@ +/* + * linux/drivers/video/fm2fb.c -- BSC FrameMaster II/Rainbow II frame buffer + * device + * + * Copyright (C) 1998 Steffen A. Mork (linux-dev@morknet.de) + * Copyright (C) 1999 Geert Uytterhoeven + * + * Written for 2.0.x by Steffen A. Mork + * Ported to 2.1.x by Geert Uytterhoeven + * Ported to new api by James Simmons + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file COPYING in the main directory of this archive for + * more details. + */ + +#include +#include +#include +#include +#include +#include + +/* + * Some technical notes: + * + * The BSC FrameMaster II (or Rainbow II) is a simple very dumb + * frame buffer which allows to display 24 bit true color images. + * Each pixel is 32 bit width so it's very easy to maintain the + * frame buffer. One long word has the following layout: + * AARRGGBB which means: AA the alpha channel byte, RR the red + * channel, GG the green channel and BB the blue channel. + * + * The FrameMaster II supports the following video modes. + * - PAL/NTSC + * - interlaced/non interlaced + * - composite sync/sync/sync over green + * + * The resolution is to the following both ones: + * - 768x576 (PAL) + * - 768x480 (NTSC) + * + * This means that pixel access per line is fixed due to the + * fixed line width. In case of maximal resolution the frame + * buffer needs an amount of memory of 1.769.472 bytes which + * is near to 2 MByte (the allocated address space of Zorro2). + * The memory is channel interleaved. That means every channel + * owns four VRAMs. Unfortunately most FrameMasters II are + * not assembled with memory for the alpha channel. In this + * case it could be possible to add the frame buffer into the + * normal memory pool. + * + * At relative address 0x1ffff8 of the frame buffers base address + * there exists a control register with the number of + * four control bits. They have the following meaning: + * bit value meaning + * + * 0 1 0=interlaced/1=non interlaced + * 1 2 0=video out disabled/1=video out enabled + * 2 4 0=normal mode as jumpered via JP8/1=complement mode + * 3 8 0=read onboard ROM/1 normal operation (required) + * + * As mentioned above there are several jumper. I think there + * is not very much information about the FrameMaster II in + * the world so I add these information for completeness. + * + * JP1 interlace selection (1-2 non interlaced/2-3 interlaced) + * JP2 wait state creation (leave as is!) + * JP3 wait state creation (leave as is!) + * JP4 modulate composite sync on green output (1-2 composite + * sync on green channel/2-3 normal composite sync) + * JP5 create test signal, shorting this jumper will create + * a white screen + * JP6 sync creation (1-2 composite sync/2-3 H-sync output) + * JP8 video mode (1-2 PAL/2-3 NTSC) + * + * With the following jumpering table you can connect the + * FrameMaster II to a normal TV via SCART connector: + * JP1: 2-3 + * JP4: 2-3 + * JP6: 2-3 + * JP8: 1-2 (means PAL for Europe) + * + * NOTE: + * There is no other possibility to change the video timings + * except the interlaced/non interlaced, sync control and the + * video mode PAL (50 Hz)/NTSC (60 Hz). Inside this + * FrameMaster II driver are assumed values to avoid anomalies + * to a future X server. Except the pixel clock is really + * constant at 30 MHz. + * + * 9 pin female video connector: + * + * 1 analog red 0.7 Vss + * 2 analog green 0.7 Vss + * 3 analog blue 0.7 Vss + * 4 H-sync TTL + * 5 V-sync TTL + * 6 ground + * 7 ground + * 8 ground + * 9 ground + * + * Some performance notes: + * The FrameMaster II was not designed to display a console + * this driver would do! It was designed to display still true + * color images. Imagine: When scroll up a text line there + * must copied ca. 1.7 MBytes to another place inside this + * frame buffer. This means 1.7 MByte read and 1.7 MByte write + * over the slow 16 bit wide Zorro2 bus! A scroll of one + * line needs 1 second so do not expect to much from this + * driver - he is at the limit! + * + */ + +/* + * definitions + */ + +#define FRAMEMASTER_SIZE 0x200000 +#define FRAMEMASTER_REG 0x1ffff8 + +#define FRAMEMASTER_NOLACE 1 +#define FRAMEMASTER_ENABLE 2 +#define FRAMEMASTER_COMPL 4 +#define FRAMEMASTER_ROM 8 + +static volatile unsigned char *fm2fb_reg; + +static struct fb_fix_screeninfo fb_fix = { + .smem_len = FRAMEMASTER_REG, + .type = FB_TYPE_PACKED_PIXELS, + .visual = FB_VISUAL_TRUECOLOR, + .line_length = (768 << 2), + .mmio_len = (8), + .accel = FB_ACCEL_NONE, +}; + +static int fm2fb_mode = -1; + +#define FM2FB_MODE_PAL 0 +#define FM2FB_MODE_NTSC 1 + +static struct fb_var_screeninfo fb_var_modes[] = { + { + /* 768 x 576, 32 bpp (PAL) */ + 768, 576, 768, 576, 0, 0, 32, 0, + { 16, 8, 0 }, { 8, 8, 0 }, { 0, 8, 0 }, { 24, 8, 0 }, + 0, FB_ACTIVATE_NOW, -1, -1, FB_ACCEL_NONE, + 33333, 10, 102, 10, 5, 80, 34, FB_SYNC_COMP_HIGH_ACT, 0 + }, { + /* 768 x 480, 32 bpp (NTSC - not supported yet */ + 768, 480, 768, 480, 0, 0, 32, 0, + { 16, 8, 0 }, { 8, 8, 0 }, { 0, 8, 0 }, { 24, 8, 0 }, + 0, FB_ACTIVATE_NOW, -1, -1, FB_ACCEL_NONE, + 33333, 10, 102, 10, 5, 80, 34, FB_SYNC_COMP_HIGH_ACT, 0 + } +}; + + /* + * Interface used by the world + */ + +static int fm2fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, + u_int transp, struct fb_info *info); +static int fm2fb_blank(int blank, struct fb_info *info); + +static const struct fb_ops fm2fb_ops = { + .owner = THIS_MODULE, + FB_DEFAULT_IOMEM_OPS, + .fb_setcolreg = fm2fb_setcolreg, + .fb_blank = fm2fb_blank, +}; + + /* + * Blank the display. + */ +static int fm2fb_blank(int blank, struct fb_info *info) +{ + unsigned char t = FRAMEMASTER_ROM; + + if (!blank) + t |= FRAMEMASTER_ENABLE | FRAMEMASTER_NOLACE; + fm2fb_reg[0] = t; + return 0; +} + + /* + * Set a single color register. The values supplied are already + * rounded down to the hardware's capabilities (according to the + * entries in the var structure). Return != 0 for invalid regno. + */ +static int fm2fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, + u_int transp, struct fb_info *info) +{ + if (regno < 16) { + red >>= 8; + green >>= 8; + blue >>= 8; + + ((u32*)(info->pseudo_palette))[regno] = (red << 16) | + (green << 8) | blue; + } + + return 0; +} + + /* + * Initialisation + */ + +static int fm2fb_probe(struct zorro_dev *z, const struct zorro_device_id *id); + +static const struct zorro_device_id fm2fb_devices[] = { + { ZORRO_PROD_BSC_FRAMEMASTER_II }, + { ZORRO_PROD_HELFRICH_RAINBOW_II }, + { 0 } +}; +MODULE_DEVICE_TABLE(zorro, fm2fb_devices); + +static struct zorro_driver fm2fb_driver = { + .name = "fm2fb", + .id_table = fm2fb_devices, + .probe = fm2fb_probe, +}; + +static int fm2fb_probe(struct zorro_dev *z, const struct zorro_device_id *id) +{ + struct fb_info *info; + unsigned long *ptr; + int is_fm; + int x, y; + + is_fm = z->id == ZORRO_PROD_BSC_FRAMEMASTER_II; + + if (!zorro_request_device(z,"fm2fb")) + return -ENXIO; + + info = framebuffer_alloc(16 * sizeof(u32), &z->dev); + if (!info) { + zorro_release_device(z); + return -ENOMEM; + } + + if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) { + framebuffer_release(info); + zorro_release_device(z); + return -ENOMEM; + } + + /* assigning memory to kernel space */ + fb_fix.smem_start = zorro_resource_start(z); + info->screen_base = ioremap(fb_fix.smem_start, FRAMEMASTER_SIZE); + fb_fix.mmio_start = fb_fix.smem_start + FRAMEMASTER_REG; + fm2fb_reg = (unsigned char *)(info->screen_base+FRAMEMASTER_REG); + + strcpy(fb_fix.id, is_fm ? "FrameMaster II" : "Rainbow II"); + + /* make EBU color bars on display */ + ptr = (unsigned long *)fb_fix.smem_start; + for (y = 0; y < 576; y++) { + for (x = 0; x < 96; x++) *ptr++ = 0xffffff;/* white */ + for (x = 0; x < 96; x++) *ptr++ = 0xffff00;/* yellow */ + for (x = 0; x < 96; x++) *ptr++ = 0x00ffff;/* cyan */ + for (x = 0; x < 96; x++) *ptr++ = 0x00ff00;/* green */ + for (x = 0; x < 96; x++) *ptr++ = 0xff00ff;/* magenta */ + for (x = 0; x < 96; x++) *ptr++ = 0xff0000;/* red */ + for (x = 0; x < 96; x++) *ptr++ = 0x0000ff;/* blue */ + for (x = 0; x < 96; x++) *ptr++ = 0x000000;/* black */ + } + fm2fb_blank(0, info); + + if (fm2fb_mode == -1) + fm2fb_mode = FM2FB_MODE_PAL; + + info->fbops = &fm2fb_ops; + info->var = fb_var_modes[fm2fb_mode]; + info->pseudo_palette = info->par; + info->par = NULL; + info->fix = fb_fix; + + if (register_framebuffer(info) < 0) { + fb_dealloc_cmap(&info->cmap); + iounmap(info->screen_base); + framebuffer_release(info); + zorro_release_device(z); + return -EINVAL; + } + fb_info(info, "%s frame buffer device\n", fb_fix.id); + return 0; +} + +static int __init fm2fb_setup(char *options) +{ + char *this_opt; + + if (!options || !*options) + return 0; + + while ((this_opt = strsep(&options, ",")) != NULL) { + if (!strncmp(this_opt, "pal", 3)) + fm2fb_mode = FM2FB_MODE_PAL; + else if (!strncmp(this_opt, "ntsc", 4)) + fm2fb_mode = FM2FB_MODE_NTSC; + } + return 0; +} + +static int __init fm2fb_init(void) +{ + char *option = NULL; + + if (fb_get_options("fm2fb", &option)) + return -ENODEV; + fm2fb_setup(option); + return zorro_register_driver(&fm2fb_driver); +} + +module_init(fm2fb_init); +MODULE_LICENSE("GPL"); -- cgit v1.3.1