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Re: [PATCH 2/2] qxl: drop shadow_rom
From: |
Paolo Bonzini |
Subject: |
Re: [PATCH 2/2] qxl: drop shadow_rom |
Date: |
Tue, 25 Feb 2020 08:39:12 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 |
On 25/02/20 06:59, Gerd Hoffmann wrote:
> Now that the rom bar is mapped read-only and the guest can't change
> things under our feet we don't need the shadow rom any more.
Can't it do so when migrating from an older version?
Paolo
>
> Signed-off-by: Gerd Hoffmann <address@hidden>
> ---
> hw/display/qxl.h | 2 +-
> hw/display/qxl.c | 25 +++++++++----------------
> 2 files changed, 10 insertions(+), 17 deletions(-)
>
> diff --git a/hw/display/qxl.h b/hw/display/qxl.h
> index 707631a1f573..3aedc7db5da0 100644
> --- a/hw/display/qxl.h
> +++ b/hw/display/qxl.h
> @@ -95,11 +95,11 @@ typedef struct PCIQXLDevice {
> uint32_t vgamem_size;
>
> /* rom pci bar */
> - QXLRom shadow_rom;
> QXLRom *rom;
> QXLModes *modes;
> uint32_t rom_size;
> MemoryRegion rom_bar;
> + uint32_t rom_mode;
> #if SPICE_SERVER_VERSION >= 0x000c06 /* release 0.12.6 */
> uint16_t max_outputs;
> #endif
> diff --git a/hw/display/qxl.c b/hw/display/qxl.c
> index 227da69a50d9..0502802688f9 100644
> --- a/hw/display/qxl.c
> +++ b/hw/display/qxl.c
> @@ -391,7 +391,6 @@ static void init_qxl_rom(PCIQXLDevice *d)
> sizeof(rom->client_monitors_config));
> }
>
> - d->shadow_rom = *rom;
> d->rom = rom;
> d->modes = modes;
> }
> @@ -403,7 +402,7 @@ static void init_qxl_ram(PCIQXLDevice *d)
> QXLReleaseRing *ring;
>
> buf = d->vga.vram_ptr;
> - d->ram = (QXLRam *)(buf + le32_to_cpu(d->shadow_rom.ram_header_offset));
> + d->ram = (QXLRam *)(buf + le32_to_cpu(d->rom->ram_header_offset));
> d->ram->magic = cpu_to_le32(QXL_RAM_MAGIC);
> d->ram->int_pending = cpu_to_le32(0);
> d->ram->int_mask = cpu_to_le32(0);
> @@ -446,7 +445,7 @@ static void qxl_ram_set_dirty(PCIQXLDevice *qxl, void
> *ptr)
> /* can be called from spice server thread context */
> static void qxl_ring_set_dirty(PCIQXLDevice *qxl)
> {
> - ram_addr_t addr = qxl->shadow_rom.ram_header_offset;
> + ram_addr_t addr = qxl->rom->ram_header_offset;
> ram_addr_t end = qxl->vga.vram_size;
> qxl_set_dirty(&qxl->vga.vram, addr, end);
> }
> @@ -529,7 +528,6 @@ static void interface_set_compression_level(QXLInstance
> *sin, int level)
> PCIQXLDevice *qxl = container_of(sin, PCIQXLDevice, ssd.qxl);
>
> trace_qxl_interface_set_compression_level(qxl->id, level);
> - qxl->shadow_rom.compression_level = cpu_to_le32(level);
> qxl->rom->compression_level = cpu_to_le32(level);
> qxl_rom_set_dirty(qxl);
> }
> @@ -561,7 +559,7 @@ static void interface_get_init_info(QXLInstance *sin,
> QXLDevInitInfo *info)
> info->num_memslots_groups = NUM_MEMSLOTS_GROUPS;
> info->internal_groupslot_id = 0;
> info->qxl_ram_size =
> - le32_to_cpu(qxl->shadow_rom.num_pages) << QXL_PAGE_BITS;
> + le32_to_cpu(qxl->rom->num_pages) << QXL_PAGE_BITS;
> info->n_surfaces = qxl->ssd.num_surfaces;
> }
>
> @@ -1035,9 +1033,6 @@ static void
> interface_set_client_capabilities(QXLInstance *sin,
> return;
> }
>
> - qxl->shadow_rom.client_present = client_present;
> - memcpy(qxl->shadow_rom.client_capabilities, caps,
> - sizeof(qxl->shadow_rom.client_capabilities));
> qxl->rom->client_present = client_present;
> memcpy(qxl->rom->client_capabilities, caps,
> sizeof(qxl->rom->client_capabilities));
> @@ -1232,11 +1227,8 @@ static void qxl_check_state(PCIQXLDevice *d)
>
> static void qxl_reset_state(PCIQXLDevice *d)
> {
> - QXLRom *rom = d->rom;
> -
> qxl_check_state(d);
> - d->shadow_rom.update_id = cpu_to_le32(0);
> - *rom = d->shadow_rom;
> + d->rom->update_id = cpu_to_le32(0);
> qxl_rom_set_dirty(d);
> init_qxl_ram(d);
> d->num_free_res = 0;
> @@ -1600,7 +1592,7 @@ static void qxl_set_mode(PCIQXLDevice *d, unsigned int
> modenr, int loadvm)
> .format = SPICE_SURFACE_FMT_32_xRGB,
> .flags = loadvm ? QXL_SURF_FLAG_KEEP_DATA : 0,
> .mouse_mode = true,
> - .mem = devmem + d->shadow_rom.draw_area_offset,
> + .mem = devmem + d->rom->draw_area_offset,
> };
>
> trace_qxl_set_mode(d->id, modenr, mode->x_res, mode->y_res, mode->bits,
> @@ -1620,7 +1612,6 @@ static void qxl_set_mode(PCIQXLDevice *d, unsigned int
> modenr, int loadvm)
> if (mode->bits == 16) {
> d->cmdflags |= QXL_COMMAND_FLAG_COMPAT_16BPP;
> }
> - d->shadow_rom.mode = cpu_to_le32(modenr);
> d->rom->mode = cpu_to_le32(modenr);
> qxl_rom_set_dirty(d);
> }
> @@ -2277,6 +2268,7 @@ static int qxl_pre_save(void *opaque)
> d->last_release_offset = (uint8_t *)d->last_release - ram_start;
> }
> assert(d->last_release_offset < d->vga.vram_size);
> + d->rom_mode = d->rom->mode;
>
> return 0;
> }
> @@ -2316,6 +2308,7 @@ static int qxl_post_load(void *opaque, int version)
> } else {
> d->last_release = (QXLReleaseInfo *)(ram_start +
> d->last_release_offset);
> }
> + d->rom->mode = d->rom_mode;
>
> d->modes = (QXLModes*)((uint8_t*)d->rom + d->rom->modes_offset);
>
> @@ -2361,7 +2354,7 @@ static int qxl_post_load(void *opaque, int version)
> case QXL_MODE_COMPAT:
> /* note: no need to call qxl_create_memslots, qxl_set_mode
> * creates the mem slot. */
> - qxl_set_mode(d, d->shadow_rom.mode, 1);
> + qxl_set_mode(d, d->rom->mode, 1);
> break;
> }
> return 0;
> @@ -2428,7 +2421,7 @@ static VMStateDescription qxl_vmstate = {
> .fields = (VMStateField[]) {
> VMSTATE_PCI_DEVICE(pci, PCIQXLDevice),
> VMSTATE_STRUCT(vga, PCIQXLDevice, 0, vmstate_vga_common,
> VGACommonState),
> - VMSTATE_UINT32(shadow_rom.mode, PCIQXLDevice),
> + VMSTATE_UINT32(rom_mode, PCIQXLDevice),
> VMSTATE_UINT32(num_free_res, PCIQXLDevice),
> VMSTATE_UINT32(last_release_offset, PCIQXLDevice),
> VMSTATE_UINT32(mode, PCIQXLDevice),
>