DOHA: Afghan President Ashraf Ghani called on the Taliban to "have courage and declare a national ceasefire" on Tuesday as he visited Doha where peace talks between government and Taliban negotiators have stalled.

At the end of a two-day trip, his first to Doha since the talks began, Ghani gave a lecture where he said Afghanistan's long conflict had to be resolved through negotiation, "not under the barrel of the gun".

"Nobody is going to wipe you out," he said in front of a socially distanced crowd of diplomats and academics, three weeks after the launch of peace talks between the Afghan government and the Taliban.

Talks between the two sides, hosted by the Gulf state and aimed at ending Afghanistan's 19-year war, have slowed over disagreements on how to frame a code of conduct that will guide the broader talks.

Headline issues, including a ceasefire or the type of governance that will shape Afghanistan's future, have yet to be discussed.

Meanwhile violence continues to rage in Afghanistan, with a suicide attack targeting a provincial governor killing at least eight people on Monday.

Earlier Ghani met with Qatar's emir, Sheikh Tamim bin Hamad Al-Thani, with Doha reaffirming its commitment to facilitate the peace process. The talks, which began with much fanfare, have made little progress but Ghani sidestepped questions over whether they have stalled. "We cannot end 20 years of war in 20 days," he told reporters as he left the lecture.