From 2fdce42dabea90646371c4cc19bfca1db666aaea Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Mon, 22 Aug 2022 14:53:20 +0200
Subject: [PATCH] scsi-generic: Fix emulated block limits VPD page

RH-Author: Kevin Wolf <kwolf@redhat.com>
RH-MergeRequest: 214: scsi-generic: Fix emulated block limits VPD page
RH-Commit: [1/1] 6f980d29b849a7b5cea894aefed5f0b6502c6298
RH-Bugzilla: 2121783
RH-Acked-by: Hanna Reitz <hreitz@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>

Commits 01ef8185b80 amd 24b36e9813e updated the way that the maximum
transfer length is calculated for patching block limits VPD page in an
INQUIRY response.

The same updates also need to be made for the case where the host device
does not support the block limits VPD page at all and we emulate the
whole page.

Without this fix, on host block devices a maximum transfer length of
(INT_MAX - sector_size) bytes is advertised to the guest, resulting in
I/O errors when a request that exceeds the host limits is made by the
guest. (Prior to commit 24b36e9813e, this code path would use the
max_transfer value from the host instead of INT_MAX, but still miss the
fix from 01ef8185b80 where max_transfer is also capped to max_iov
host pages, so it would be less wrong, but still wrong.)

Cc: qemu-stable@nongnu.org
Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=2096251
Fixes: 01ef8185b809af9d287e1a03a3f9d8ea8231118a
Fixes: 24b36e9813ec15da7db62e3b3621730710c5f020
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20220822125320.48257-1-kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 51e15194b0a091e5c40aab2eb234a1d36c5c58ee)

Resolved conflict: qemu_real_host_page_size() is a getter function in
current upstream, but still just a public global variable downstream.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 hw/scsi/scsi-generic.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c
index 0306ccc7b1..3742899839 100644
--- a/hw/scsi/scsi-generic.c
+++ b/hw/scsi/scsi-generic.c
@@ -147,6 +147,18 @@ static int execute_command(BlockBackend *blk,
     return 0;
 }
 
+static uint64_t calculate_max_transfer(SCSIDevice *s)
+{
+    uint64_t max_transfer = blk_get_max_hw_transfer(s->conf.blk);
+    uint32_t max_iov = blk_get_max_hw_iov(s->conf.blk);
+
+    assert(max_transfer);
+    max_transfer = MIN_NON_ZERO(max_transfer,
+                                max_iov * qemu_real_host_page_size);
+
+    return max_transfer / s->blocksize;
+}
+
 static int scsi_handle_inquiry_reply(SCSIGenericReq *r, SCSIDevice *s, int len)
 {
     uint8_t page, page_idx;
@@ -179,12 +191,7 @@ static int scsi_handle_inquiry_reply(SCSIGenericReq *r, SCSIDevice *s, int len)
         (r->req.cmd.buf[1] & 0x01)) {
         page = r->req.cmd.buf[2];
         if (page == 0xb0) {
-            uint64_t max_transfer = blk_get_max_hw_transfer(s->conf.blk);
-            uint32_t max_iov = blk_get_max_hw_iov(s->conf.blk);
-
-            assert(max_transfer);
-            max_transfer = MIN_NON_ZERO(max_transfer, max_iov * qemu_real_host_page_size)
-                / s->blocksize;
+            uint64_t max_transfer = calculate_max_transfer(s);
             stl_be_p(&r->buf[8], max_transfer);
             /* Also take care of the opt xfer len. */
             stl_be_p(&r->buf[12],
@@ -230,7 +237,7 @@ static int scsi_generic_emulate_block_limits(SCSIGenericReq *r, SCSIDevice *s)
     uint8_t buf[64];
 
     SCSIBlockLimits bl = {
-        .max_io_sectors = blk_get_max_transfer(s->conf.blk) / s->blocksize
+        .max_io_sectors = calculate_max_transfer(s),
     };
 
     memset(r->buf, 0, r->buflen);
-- 
2.27.0