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[PATCH 6/7] x86/HVM: drop stdvga's "{g,s}r_index" struct members


  • To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Jan Beulich <jbeulich@xxxxxxxx>
  • Date: Tue, 10 Sep 2024 16:41:18 +0200
  • Autocrypt: addr=jbeulich@xxxxxxxx; keydata= xsDiBFk3nEQRBADAEaSw6zC/EJkiwGPXbWtPxl2xCdSoeepS07jW8UgcHNurfHvUzogEq5xk hu507c3BarVjyWCJOylMNR98Yd8VqD9UfmX0Hb8/BrA+Hl6/DB/eqGptrf4BSRwcZQM32aZK 7Pj2XbGWIUrZrd70x1eAP9QE3P79Y2oLrsCgbZJfEwCgvz9JjGmQqQkRiTVzlZVCJYcyGGsD /0tbFCzD2h20ahe8rC1gbb3K3qk+LpBtvjBu1RY9drYk0NymiGbJWZgab6t1jM7sk2vuf0Py O9Hf9XBmK0uE9IgMaiCpc32XV9oASz6UJebwkX+zF2jG5I1BfnO9g7KlotcA/v5ClMjgo6Gl MDY4HxoSRu3i1cqqSDtVlt+AOVBJBACrZcnHAUSuCXBPy0jOlBhxPqRWv6ND4c9PH1xjQ3NP nxJuMBS8rnNg22uyfAgmBKNLpLgAGVRMZGaGoJObGf72s6TeIqKJo/LtggAS9qAUiuKVnygo 3wjfkS9A3DRO+SpU7JqWdsveeIQyeyEJ/8PTowmSQLakF+3fote9ybzd880fSmFuIEJldWxp Y2ggPGpiZXVsaWNoQHN1c2UuY29tPsJgBBMRAgAgBQJZN5xEAhsDBgsJCAcDAgQVAggDBBYC AwECHgECF4AACgkQoDSui/t3IH4J+wCfQ5jHdEjCRHj23O/5ttg9r9OIruwAn3103WUITZee e7Sbg12UgcQ5lv7SzsFNBFk3nEQQCACCuTjCjFOUdi5Nm244F+78kLghRcin/awv+IrTcIWF hUpSs1Y91iQQ7KItirz5uwCPlwejSJDQJLIS+QtJHaXDXeV6NI0Uef1hP20+y8qydDiVkv6l IreXjTb7DvksRgJNvCkWtYnlS3mYvQ9NzS9PhyALWbXnH6sIJd2O9lKS1Mrfq+y0IXCP10eS FFGg+Av3IQeFatkJAyju0PPthyTqxSI4lZYuJVPknzgaeuJv/2NccrPvmeDg6Coe7ZIeQ8Yj t0ARxu2xytAkkLCel1Lz1WLmwLstV30g80nkgZf/wr+/BXJW/oIvRlonUkxv+IbBM3dX2OV8 AmRv1ySWPTP7AAMFB/9PQK/VtlNUJvg8GXj9ootzrteGfVZVVT4XBJkfwBcpC/XcPzldjv+3 HYudvpdNK3lLujXeA5fLOH+Z/G9WBc5pFVSMocI71I8bT8lIAzreg0WvkWg5V2WZsUMlnDL9 mpwIGFhlbM3gfDMs7MPMu8YQRFVdUvtSpaAs8OFfGQ0ia3LGZcjA6Ik2+xcqscEJzNH+qh8V m5jjp28yZgaqTaRbg3M/+MTbMpicpZuqF4rnB0AQD12/3BNWDR6bmh+EkYSMcEIpQmBM51qM EKYTQGybRCjpnKHGOxG0rfFY1085mBDZCH5Kx0cl0HVJuQKC+dV2ZY5AqjcKwAxpE75MLFkr wkkEGBECAAkFAlk3nEQCGwwACgkQoDSui/t3IH7nnwCfcJWUDUFKdCsBH/E5d+0ZnMQi+G0A nAuWpQkjM1ASeQwSHEeAWPgskBQL
  • Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
  • Delivery-date: Tue, 10 Sep 2024 14:50:18 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

No consumers are left, hence the producer and the fields themselves can
also go away. stdvga_outb() is then useless, rendering stdvga_out()
useless as well. Hence the entire I/O port intercept can go away.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

--- a/xen/arch/x86/hvm/stdvga.c
+++ b/xen/arch/x86/hvm/stdvga.c
@@ -37,62 +37,6 @@
 #define VGA_MEM_BASE 0xa0000
 #define VGA_MEM_SIZE 0x20000
 
-static int stdvga_outb(uint64_t addr, uint8_t val)
-{
-    struct hvm_hw_stdvga *s = &current->domain->arch.hvm.stdvga;
-    int rc = 1;
-
-    switch ( addr )
-    {
-    case 0x3c4:                 /* sequencer address register */
-        s->sr_index = val;
-        break;
-
-    case 0x3ce:                 /* graphics address register */
-        s->gr_index = val;
-        break;
-
-    default:
-        rc = 0;
-        break;
-    }
-
-    return rc;
-}
-
-static void stdvga_out(uint32_t port, uint32_t bytes, uint32_t val)
-{
-    switch ( bytes )
-    {
-    case 1:
-        stdvga_outb(port, val);
-        break;
-
-    case 2:
-        stdvga_outb(port + 0, val >> 0);
-        stdvga_outb(port + 1, val >> 8);
-        break;
-
-    default:
-        break;
-    }
-}
-
-static int cf_check stdvga_intercept_pio(
-    int dir, unsigned int port, unsigned int bytes, uint32_t *val)
-{
-    struct hvm_hw_stdvga *s = &current->domain->arch.hvm.stdvga;
-
-    if ( dir == IOREQ_WRITE )
-    {
-        spin_lock(&s->lock);
-        stdvga_out(port, bytes, *val);
-        spin_unlock(&s->lock);
-    }
-
-    return X86EMUL_UNHANDLEABLE; /* propagate to external ioemu */
-}
-
 static int cf_check stdvga_mem_read(
     const struct hvm_io_handler *handler, uint64_t addr, uint32_t size,
     uint64_t *p_data)
@@ -197,11 +141,6 @@ void stdvga_init(struct domain *d)
     {
         struct hvm_io_handler *handler;
 
-        /* Sequencer registers. */
-        register_portio_handler(d, 0x3c4, 2, stdvga_intercept_pio);
-        /* Graphics registers. */
-        register_portio_handler(d, 0x3ce, 2, stdvga_intercept_pio);
-
         /* VGA memory */
         handler = hvm_next_io_handler(d);
 
--- a/xen/arch/x86/include/asm/hvm/io.h
+++ b/xen/arch/x86/include/asm/hvm/io.h
@@ -111,8 +111,6 @@ struct vpci_arch_msix_entry {
 };
 
 struct hvm_hw_stdvga {
-    uint8_t sr_index;
-    uint8_t gr_index;
     struct page_info *vram_page[64];  /* shadow of 0xa0000-0xaffff */
     spinlock_t lock;
 };




 


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